# Stine Seed Request (09

- 063

- 01p ) for an Extension of a Determination of Nonregulated Status to HCEM485

OECD Unique Identifier: HCEM485



## Draft Environmental Assessment

June 2012

Agency Contact Cindy Eck Biotechnology Regulatory Services 4700 River Road USDA, APHIS Riverdale, MD 20737 Fax: (301) 734

- 8669

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– 2600 (voice and TDD).

To f ile a complaint of discrimination, write USDA, Director, Office of Civil Rights, Room 326

– W, Whitten Building, 1400 Independence Avenue, SW, Washington, DC 20250

– 9410 or call (202) 720

– 5964 (voice and TDD). USDA is an equal opportunity provider and employe r.

Mention of companies or commercial products in this report does not imply recommendation or endorsement by the U.S. Department of Agriculture over others not mentioned. USDA neither guarantees nor warrants the standard of any product mentioned. Prod uct names are mentioned solely to report factually on available data and to provide specific information.

This publication reports research involving pesticides. All uses of pesticides must be registered by appropriate State and/or Federal agencies bef ore they can be recommended.i TABLE OF CONTENTS Page

1 PURPOSE AND NEED

................................ ................................ ................................ .......... 1

1.1 Background

................................ ................................ ................................ ....................... 1 1.1.1 Request for an extension of nonregulated status

................................ ........................ 1 1.1.2 Purpose of Product

................................ ................................ ................................ ..... 1 1.1.3 Coordinated Framework Review

................................ ................................ ............... 1

1.2 Purpose and Need for APHIS Action

................................ ................................ ................ 3

1.3 Public Involvement

................................ ................................ ................................ ........... 4

2 AFFECTED ENVIRONMENT

................................ ................................ .............................. 6

2.1 Agricultural Production of Corn

................................ ................................ ....................... 6 2.1.1 Acreage and Area of Corn Production

................................ ................................ ....... 6 2.1.2 Agronomic Practices

................................ ................................ ................................ .. 9 2.1.3 Corn Seed Production

................................ ................................ .............................. 18 2.1.4 Organic Corn Production

................................ ................................ ......................... 19

2.2 Physical Environment

................................ ................................ ................................ ..... 20 2.2.1 Soil Quality

................................ ................................ ................................ .............. 20 2.2.2 Water Resources

................................ ................................ ................................ ...... 23 2.2.3 Air Quality

................................ ................................ ................................ ............... 26 2.2.4 Clim ate Change

................................ ................................ ................................ ........ 28

2.3 Biological Resources

................................ ................................ ................................ ....... 29 2.3.1 Animal Communities

................................ ................................ ............................... 29 2.3.2 Plants Communities

................................ ................................ ................................ . 31 2.3. 3 Gene Flow and Weediness

................................ ................................ ....................... 36 2.3.4 Microorganisms

................................ ................................ ................................ ....... 38 2.3.5 Biodiversity

................................ ................................ ................................ .............. 40

2.4 Human Health

................................ ................................ ................................ ................. 43

2.5 Animal Feed

................................ ................................ ................................ .................... 46

2.6 Socioeconomic

................................ ................................ ................................ ................ 48 2.6.1 Domestic Economic Environment

................................ ................................ ........... 48 2.6.2 Trade Economic Environment

................................ ................................ ................. 52

3 ALTERNATIVES

................................ ................................ ................................ ................. 57

3.1 No Action Alternative: Continuation as a Regulated Article

................................ ......... 57

3.2 Preferred Alternative: Approve the Request for an Extension of a Determination of Nonregulated Status to Maize Line HCEM485 from Corn Event GA21

................................ ................................ ................................ .................... 57

3.3 Alternatives Considered But Rejected from Further Consideration

............................... 58 3.3.1 Prohibit Any Maize Line HCEM485 Corn from Being Released

........................... 58 3.3.2 Isolation Distance between Maize Line HCEM485 and Non

- GE Corn Production and Geographical Restrictions

................................ .............................. 58ii 3.3.3 Requirement of Testing for Maize Line HCEM485

................................ ................ 59

3.4 Comparison of Alternatives

................................ ................................ ............................ 59

4 ENVIRONMENTAL CONSEQ UENCES

................................ ................................ ........... 62

4.1 Scope of Analysis

................................ ................................ ................................ ............ 62

4.2 Ag ricultural Production of Corn

................................ ................................ ..................... 63 4.2.1 Acreage and Area of Corn Production

................................ ................................ ..... 63 4.2.2 Agronomic Practices

................................ ................................ ................................ 63 4. 2.3 Corn Seed Production

................................ ................................ .............................. 65 4.2.4 Organic Corn Production

................................ ................................ ......................... 66

4.3 Physical Environment

................................ ................................ ................................ ..... 67 4.3.1 Soil Quality

................................ ................................ ................................ .............. 67 4.3.2 Wate r Resources

................................ ................................ ................................ ...... 68 4.3.3 Air Quality

................................ ................................ ................................ ............... 69 4.3.4 Climate Change

................................ ................................ ................................ ........ 71

4.4 Biological Resources

................................ ................................ ................................ ....... 72 4.4.1 Animal Communities

................................ ................................ ............................... 72 4.4.2 Plants Communi ties

................................ ................................ ................................ . 74 4.4.3 Gene Flow and Weediness

................................ ................................ ....................... 77 4.4.4 Microorganisms

................................ ................................ ................................ ....... 78 4.4.5 Biodiversity

................................ ................................ ................................ .............. 80

4.5 Human Health

................................ ................................ ................................ ................. 83 4.5.1 No Action Alternative: Human Health

................................ ................................ .... 83 4.5.2 Preferred Alternative: Human Health

................................ ................................ ...... 85

4.6 Animal Feed

................................ ................................ ................................ .................... 86 4.6.1 No Action Alternative: Animal Feed

................................ ................................ ....... 86 4.6.2 Preferred Alternative: Animal Feed

................................ ................................ ......... 87

4.7 Socioeconomic Impacts

................................ ................................ ................................ ... 88 4. 7.1 Domestic Economic Environment

................................ ................................ ........... 88 4.7.2 Trade Economic Environment

................................ ................................ ................. 90

5 CUMULATIVE IMPACTS

................................ ................................ ................................ .. 93

5.1 Assumptions Used for Cumulative Impacts Analysis

................................ ..................... 93

5.2 Cumulative Effects

................................ ................................ ................................ .......... 94 5.2.1 Past and Present Actions

................................ ................................ .......................... 94 5.2.2 Reasonably Foreseeable Actions

................................ ................................ ............. 97

6 THREATENED AND ENDAN GERED SPECIES

................................ ........................... 100

6.1 Potential Effects of Maize Line HCEM485 on TES

................................ ..................... 102

6.2 Potential Effects of the Use of Glyphosate

................................ ................................ ... 103 6.2.1 EPA Endangered Species Protection Program (ESPP)

................................ .......... 103 6.2.2 EPA TES Evaluation Process

................................ ................................ ................ 104 6.2.3 Ecological Risks of Glyphosate

................................ ................................ ............. 105iii 6.2.4 Potential Impacts of Glyphosate Use in the Production of Corn

........................... 108

7 CONSIDERATION OF EXE CUTIVE ORDERS, STAND ARDS, AND TREATIES RELATING TO ENVIRONMENTAL IMPACT S

................................ ............................ 109 7.1.1 Executive Orders with Domestic Implications

................................ ...................... 109 7.1.2 International Implications

................................ ................................ ...................... 111 7.1.3 Compliance with Clean Water Act and Clean Air Act

................................ .......... 113 7.1.4 Impacts on Unique Characteristic s of Geographic Areas

................................ ...... 113 7.1.5 National Historic Preservation Act (NHPA) of 1966 as Amended

....................... 115

8 LIST OF PREPARERS

................................ ................................ ................................ ....... 116

9 REFERENCES

................................ ................................ ................................ ................... 117

Appendix A Federally Threatened and Endangered Species in Major Corn Production U.S. States and Puerto Rico

LIST OF FIGURES

No Page

Figure 1. The 2010 estimated amount of planted corn acreage by U.S. county in selected states. Estimates range from those counties that had less than 10,000 acres of planted corn to those with 150,000 acres or more, and also reflect those counties not in cluded in the estimation.

................................ ............................. 7 Figure 2. The amount of planted and harvested corn acreage in millions of acres within the U.S. from 1 991 through 2011.

................................ ................................ ............... 8 Figure 3. The percentage of U.S. planted corn acreage with GE varieties from 2000 through 2011. All GE variet ies are inclusive of insect

- resistant

- only ( Bacillus thuringiensis (Bt)), herbicide

- resistant

- only, and stacked varieties (having both insect

- and herbicide

- resistant traits).

................................ ..................... 8 Figure 4. The adoption, as a percentage of all planted corn, of herbicide

- resistant corn (including herbicide

- resistant

- only and stacked herbicide

- and insect

- resistant varieties) in 2000, 2005, and 2011 of corn estimating program states.

....................... 9 Figure 5. Application to corn from 1996 to 2008 of glyphosate and other herbicides in terms of p ounds per active ingredient per acre, and the percentage of herbicide

- resistant planted corn.

................................ ................................ ................ 17 Figure 6. Percentage distributio n of 2010 U.S. crop value among corn, soybean, hay, wheat, and other crops. Corn is among the most important field crops in the U.S. as its value of production was 41.7% of the total value of field crops in 2010.

................................ ................................ ................................ .......................... 49 Figure 7. Value of U.S. corn crop as a percent of all U.S. field crops from 2001 to 2010. Note the value of corn has increased since 2001, indicating its growing importance in U.S. agriculture.

................................ ................................ .................. 50iv Figure 8. U.S. corn per acre cost and value of production estimates in major ARMS

corn

- produc ing regions and the entire U.S. in 2010. Values presented exclude government payments. States comprising the regions include: Heartland (Illinois, Indiana, Iowa, Minnesota, Missouri, Nebraska, Ohio, and South Dakota), Northern Crescent (Michigan, Minneso ta, Ohio, and Wisconsin), Northern Great Plains (Minnesota, Nebraska, North Dakota, and South Dakota), Prairie Gateway (Kansas, Nebraska, and Texas), Eastern Uplands (Missouri and Ohio), Fruitful Rim (Texas), and Southern Seaboard (Texas) resource regions (Fernandez

- Cornejo and McBride, 2002). These regions vary in terms of land productivity and cost of production.

........................... 50 Figure 9. U.S. and world corn exports in million metric tons for marketing years 2000/01 to 2010/11. Market years extend from September to August. The rest of the world major exporters include Argentina, Brazil, Canada, China, EU

- 27, India, Paraguay, Romania, Serbia, South Africa, Thailand, Ukraine, and Zambia as well as other smaller exporting countries. Note that U.S. percentage of corn exports in relation to overall world exports declined at the end of the last decade.

................................ ................................ ................................ 53 Figure 10. U.S. and world corn production in million metric tons for marketing years 2000/01 to 2010/11. Market years extend from September to August. The rest of the world major producing countries include Argentina, Brazil, Canada, China, Egypt, EU

- 27, India, Indonesia, Mexico, Nigeria, Philippines, Romania, Serbia, South Africa, Thailand, Turkey, and the Ukraine. Note that U.S. production increased slightly while it s percentage of overall world corn production declined in the last decade.

................................ ................................ ...... 55 Figure 11. U.S. and world corn consumption in million metric tons for marketing years 2000/01 to 2010/11. Marketing years extend from September to August. The rest of the world major comsumers of corn include Brazil, Canada, China, Egypt, EU

- 27, India, Japan, Mexico, and South Africa. Note both U.S . and world corn consumption has increased over the last decade, although the U.S. percentage of overll world corn consumption has decreased.

................................ ................................ ................................ ................... 56v LIST OF TAB LES

No Page

Table 1. Total farm diesel fuel consumption estimate (in gallons per year) for no

- till versus conventional till corn production in the Urbana, Illinois postal code.

........... 27

Table 2. U.S. glyphosate

- resistant weeds as of December 2011.

................................ ............ 33

Table 3. U.S. states with more than one weed species with glyphosate resistance.

................ 34

Table 4. Largest importers of U.S. corn in the 2010/11 Season.

................................ ............. 54

Table 5. World corn consumption for marketing years (August to September) 2008/2009 to 2010/2011.

................................ ................................ ........................... 55

Table 6. Summary of issues of potential impacts and consequences of alternatives.

.............. 60vi ACRONYMS AND ABBREVIATIONS

2mEPSPS double mutated 5

- enolpyruvylshikimate

- 3

- phosphate synthase ACCase acetyl

- CoA Carboxylase AIA advanced informed agreement ALS acetolactate synthase AMS Agricultural Marketing Service AMPA aminomethyl

- phosphonic acid AOSCA Association of Official Seed Certifying Agencies ARMS Agricultural Resource Management Survey ARS Agricultural Research Service APHIS Animal and Plant Health Inspection Service BMP best management practice s BNF Biotechnology Notification File BRS Biotechnology Regulatory Service’s Bt Bacillus thuring i ensis Ca 2 + calcium ion CAA Clean Air Act CAS# Chemical Abstract Service Number CBD Convention on Biological Diversity CFR Code of Federal Regulations CH 4 methane CO 2 carbon dioxide CO carbon monoxide Coordinated Framework Coordinated Framework for the Regulation of Biotechnology CP4 EPSPS CP4 5

- enolpyruvylshikimate

- 3

- phosphate synthase protein derived from the Agrobacterium sp. strain CRLF California red

- legged frog CWA Clean Water Act DIMBOA 2,4

- Dihydroxy

- 7

- methoxy

- 2H

- 1,4

- benzoxazin

- 3(4H)

- one DNA deoxyribonucleic acid EA Environmental Assessment ECOS Environmental Conservation Online System EEC estimated environmental concentrations EIS Environmental Impact Statement EO Executive Order EPA U.S. Environmental Protection Agency EPSPS 5

- enolpyruvylshikimate

- 3

- phosphate synthase ERS Economic Research Service ESA Endangered Species Act ESPP Endangered Species Protection Program ESU evolutionarily significant unit FALCPA Food Allergen Labeling and Consumer Protection Act of 2004 FDA U.S. Food and Drug Administration Fe 2 + iron ion FFDCA Federal Food, Drug, and Cosmetic Act FFP food, feed, or p rocessingvii ACRONYMS AND ABBREVIATIONS (cont inued )

FIFRA Federal Insecticide, Fungicide, and Rodenticide Act FR Federal Register GE genetically engineered GHG greenhouse gases HED Health Effects Division IP identity preservation IPPC International Plant Protection Convention ISPM International Standard for Phytosanitary Measure K potassium lb/Ac pounds per acre lb ae/Ac pounds acid equivalent per acre lb ai/Ac pounds active ingredient per acre LMO living modified organism LOC level of concern Mn 2 + manganese ion N 2 O nitrous oxide Na sodium NAAQS National Ambient Air Quality Standards NAPPO North American Plant Protection Organization NASS National Agricultural Statistics Service NCGA National Corn Growers’ Association NEPA National Environmental Poli cy Act NH 4 + ammonium ion NHPA National Historic Preservation Act NMFS National Marine Fisheries Service NO 2 nitrogen dioxide NOP National Organic Program NPS nonpoint source pollution NRC National Research Council NRCS Natural Resources Conservation Service O 3 ozone OECD Organisation for Economic Co

- operation and Development Pb lead PDP Pesticide Data Program pH potential for hydrogen measure of acidity or alkalinity PIPs plant

- incorporated protectants PM particulate matter PM 10 coarse particulate matter (PM) greater than 2.5 micrometers and less than 10 micrometers in diameter PM 2.5 fine particles less than 2.5 micrometers in diameter POEA polyethoxylated tallow amine PPE personal protective equipment
ppm parts per million PPRA P lant Pest Risk Assessmentviii ACRONYMS AND ABBREVIATIONS (cont inue d)

PRA Plant Risk Analysis RED Reregistration Eligibility Decision RQ risk quotients SDWA Safe Drinking Water Act SIP State Implementation Plan SO 2 sulfur dioxide SOC soil organic carbon SOM soil organic matter SSA Sole Source Aquifer Stine Stine Seed Farm, Inc. TES Threatened and Endangered Species TSCA Toxic Substances Control Act U.S

. United States U.S.C United States Code USDA United States Department of Agriculture's USFWS U.S. Fish & Wil dlife Service WPS Worker Protection Standard1 

### 1 PURPOSE AND NEED

1.1 Background

1.1.1 Request for an extension of nonregulated status Stine Seed Farm, Inc. (hereafter Stine) of Adel, Iowa submitted a request (APHIS Number 09

- 063

- 01p) to APHIS in 2009 for an extension of a determination of nonregulated status to Maize Line HCEM485 that expresses a modified corn epsps gene which confers resistance to the herbicide glyphosate. ( Stine, 2011 ) The extension request cites the antecedent organism GA21 ( Monsanto, 1997 ) for which a petition for nonregulated status was approved on November 18, 1997 ( 62 F.R. 64350 )

. In the event of an extension of a determination of nonregulated statu s, the nonregulated status for Maize Line HCEM485 would include Maize Line HCEM485, any progeny derived from crosses between Maize Line HCEM485 and conventional corn, and crosses of Maize Line HCEM485 with other biotechnology

- derived corn that are no longer subject to the regulatory requirements of 7 CFR part 340 or the plant pest provisions of the Plant Protection Act. Maize Line HCEM485 is currently regulated under 7 CFR part 340. Interstate movements and field trials of Maize Line HCEM485 have been conducted under permits issued or notifications acknowledged by APHIS since 2005. Data resulting from these field trials are described in the extension request ( Stine, 2011 )

.

1.1.2 Purpose of Product The purpose of Maize Line HCEM485 is to provide another corn seed option that confers resistance to the herbicide glyphosate ( Stine, 2011 ) . Glyphosat e works non

- selectively on a wide range of plant species and may be applied at different growth stages ; hence

, it is easy to use, is a relatively low

- cost herbicide, and facilitates conservation tillage farming practices while being relatively lower in tox icity to the environment than other pesticides ( Gianessi, 2008 ; Duke and Powles, 2009 ) . The potential commercial use of Maize Line HCEM485 would offer farmers an additional choice of glyphosate

- resistant varieties for the control of weeds.

1.1.3 Coordinated Framework Review
Since 1986, the Unit ed States government has regulated genetically engineered (GE) organisms pursuant to a regulatory framework known as the Coordinated Framework for the Regulation of Biotechnology (Coordinated Frame work) ( 51 FR 23302 ; 57 FR 22984 ) . The Coordinated Framework, published by the Office of Science and Technology Policy, describes the comprehensive federal regulatory policy for ensuring the safety of biotechnolog y research and products and explains how federal agencies will use existing Federal statutes in a manner to ensure public health and environmental safety while maintaining regulatory flexibility to avoid impeding the growth of the biotechnology industry. The Coordinated Framework is based on several important guiding principles: (1) agencies should define those transgenic organisms subject to review to the extent permitted by their respective statutory authorities; (2) agencies are required to focus on the characteristics and risks of the biotechnology product, not the process by which it is created; (3) agencies are mandated to exercise oversight of GE organisms only when there is evidence of “unreasonable” risk.

The Coordinated Framework explains the regu latory roles and authorities for the three major agencies involved in regulating GE organisms: USDA’s Animal and Plant Health Inspection2 Service (APHIS), the Environmental Protection Agency (EPA) , and the Food an d Drug Administration (FDA).

USDA

- APHIS

APHI S regulations at 7 Code of Federal Regulations (CFR) part 340, which were promulgated pursuant to authority granted by the Plant Protection Act, as amended (7 United States Code (U.S.C.) 7701

– 7772), regulate the introduction (importation, interstate moveme nt, or release into the environment) of certain GE organisms and products. A GE organism is no longer subject to the plant pest provisions of the Plant Protection Act or to the regulatory requirements of 7 CFR part 340 when APHIS determines that it is unl ikely to pose a plant pest risk. A GE organism is considered a regulated article if the donor organism, recipient organism, vector, or vector agent used in engineering the organism belongs to one of the taxa listed in the regulation (7 CFR 340.2) and is a lso considered a plant pest. A GE organism is also regulated under Part 340 when APHIS has reason to believe that the GE organism may be a plant pest or APHIS does not have information to determine if the GE organism is unlikely to pose a plant pest risk.

A person may petition the agency that a particular regulated article is unlikely to pose a plant pest risk, and, therefore, is no longer regulated under the plant pest provisions of the Plant Protection Act or the regulations at 7 CFR 340. A GE organism is no longer subject to the regulatory requirements of 7 CFR part 340 or the plant pest provisions of the Plant Protection Act when APHIS determines that it is unlikely to pose a plant pest risk.

A person may also request that APHIS extend a determinatio n of nonregulated status to other organisms under §340.6(e)(2) of the regulations

. Such a request shall include information to establish the similarity of the antecedent organism and the regulated articles in question.

Environmental Protection Agency

Th e EPA is responsible for regulating the sale, distribution, and use of pesticides, including pesticides that are produced by an organism through techniques of modern biotechnology. The EPA regulates plant incorporated protectants (PIPs) under the Federal I nsecticide, Fungicide, and Rodenticide Act (FIFRA) (7 U.S.C. 136 et seq. ) and certain biological control organisms under the Toxic Substances Control Act (TSCA) (15 U.S.C. 53 et seq .). Before planting a crop containing a PIP, a company must seek an experi mental use permit from EPA. Commercial production of crops containing PIPs for purposes of seed increases and sale requires a FIFRA Se ction 3 registration with EPA.

Under FIFRA (7 U.S.C. 136 et seq. ), EPA regulates the use of pesticides (requiring regist ration of a pesticide for a specific use prior to distribution or sale of the pesticide for a proposed use pattern ) . EPA examines the ingredients of the pesticide; the particular site or crop on which it is to be used; the amount, frequency, and timing of its use; and storage and disposal practices. Prior to registration for a new use for a new or previously registered pesticide, EPA must determine through testing that the pesticide will not cause unreasonable adverse effects on humans, the environment, a nd non

- target species when used in accordance with label instructions. EPA must also approve the language used on the pesticide label in accordance with 40 CFR part 158. Once registered, a pesticide may not legally be used unless the use is3 consistent wi th the approved directions for use on the pesticide's label or labeling. The overall intent of the label is to provide clear directions for effective product performance while minimizing risks to human health and the environment. The Food Quality Protect ion Act (FQPA) of 1996 amended FIFRA, enabling EPA to implement periodic registration review of pesticides to ensure they are meeting current scientific and regulatory standards of safety and continue to have no unreasonable adverse effects ( US

- EPA, 2011d )

.

EPA also sets tolerances for residues of pesticides on and in food and animal feed, or establishes an exemption from the requirement for a tolerance, under the Federal Food, Drug, and Cosmetic Act (FFDCA). EPA is required, before establishing pesticide tolerance, to re ach a safety determination based on a finding of reasonable certainty of no harm under the FFDCA, as amended by the FQPA. FDA enforces the pesticide tolerances set by EPA.

Food and Drug Administration

FDA regulates GE organisms under the authority of the F FDCA (21 U.S.C. 301 et seq. ). The FDA published its policy statement concerning regulation of products derived from new plant varieties, including those derived from genetic engineering, in the Federal Register on May 29, 1992 ( 57 FR 22984 ) . Under this policy, FDA implements a voluntary consultatio n process to ensure that human food and animal feed safety issues or other regulatory issues, such as labeling, are resolved before commercial distribution of bioengineered food. This voluntary consultation process provides a way for developers to receive assistance from FDA in complying with their obligations under Federal food safety laws prior to marketing.

More recently, in June 2006, FDA published recommendations in “Guidance for Industry: Recommendations for the Early Food Safety Evaluation of New No n

- Pesticidal Proteins Produced by New Plant Varieties Intended for Food Use” ( US

- FDA , 2006 ) for establishing voluntary food safety evaluations for new non

- pesticidal proteins produced by new plant varieties intended to be used as food, including bioengineered plants. Early food safety evaluations help make sure that potential food saf ety issues related to a new protein in a new plant variety are addressed early in development. These evaluations are not intended as a replacement for a biotechnology consultation with FDA, but the information may be used later in the biotechnology consul tation.

Maize Line HCEM485 is within the scope of the FDA policy statement concerning regulation of products derived from new plant varieties, including those produced through genetic engineering. Stine initiated the consultation process with the FDA for the commercial distribution of Maize Line HCEM485 and submitted a safety and nutritional assessment of food and feed derived from Maize Line HCEM485 to the FDA in December 2010 in support of the consultation with the FDA for the commercial distribution of Maize Line HCEM485; as of publication of this EA, a determination is still pending (see http://www.accessdata.fda.gov /scripts/fcn/fcnNavigation.cfm?rpt=bioListing for a list of completed consultations).

1.2 Purpose and Need for APHIS Action Under the authority of the plant pest provisions of the Plant Protection Act and 7 CFR part 340, APHIS has issued regulations for the safe development and use of GE organisms. A person may petition the agency that a particular regulated article is unlikel y to pose a plant pest risk, and,4 therefore, is no longer regulated under the plant pest provisions of the Plant Protection Act or the regulations at 7 CFR 340. A GE organism is no longer subject to the regulatory requirements of 7 CFR part 340 or the pla nt pest provisions of the Plant Protection Act when APHIS determines that it is unlikely to pose a plant pest risk. A person may also request that APHIS extend a determination of nonregulated status to other organisms under §340.6(e)(2) of the regulations

. Such a request shall include information to establish the similarity of the antecedent organism and the regulated articles in question. As required by § 340.6, APHIS must respond to petitioners who request a determination of the regulated status of GE organisms, including GE plants such as Maize Line HCEM485

. When a request for an extension of nonregulated status is submitted, APHIS must make a determination if the GE organism is similar to an antecedent organism which has previously been determined to be unlikely to pose a plant pest risk. If APHIS determines based on its Plant Pest Risk Assessment (PPRA) of the antecedent organism that the genetically engineered organism identified in the extension request is unlikely to pose a plant pest risk, the g enetically engineered organism is no longer subject to the plant pest provisions of the Plant Protection Act and 7 CFR part 340.

APHIS has prepared this E nvironmental A ssessment (EA) to consider the potential environmental effects of an agency determinatio n of nonregulated status consistent with Council of Environmental Quality’s National Environmental Policy Act ( NEPA ) regulations and the USDA and APHIS NEPA implementing regulations and procedures (40 CFR parts 1500

- 1508, 7 CFR part 1b, and 7 CFR part 372)

. This EA has been prepared in order to specifically evaluate the effects on the quality of the human environment 1 that may result from APHIS’ response to Stine’s extension request for a determination of nonregulat ed status of Maize Line HCEM485.

1.3 Public Involvement APHIS routinely seeks public comment on EAs prepared in response to petitions for nonregulated status of GE organisms. APHIS does this through a notice published in the Federal Register

. The issues discussed in this EA were developed by considering the public concerns as well as issues raised in public comments submitted for other EAs of GE organisms, concerns raised in lawsuits, as well as those issues of concern that have been raised by various stakeholders. These issues, including those regarding the agricultural production of corn using various production methods and the environmental and food/feed safety of GE plants were addressed to analyze the potential environmental impacts of Mai ze Line HCEM485 corn

. This EA will be available for public comment for a period of 3 0 days. Comments received by the end of the 3 0

- day period will be analyzed and used to inform APHIS’ decision to extend the determination of non regulated status of GA21 t o Maize Line HCEM485 and to assist APHIS in determining whether an Environmental Impact Statement (EIS) is required prior to making a determination decision of the regulated status of this corn variety.

Paragraph (e) of § 340.6 provides that APHIS will p ublish a notice in the Federal Register announcing all preliminary decisions to extend determinations of nonregulated status for 30 days before the decisions become final and effective. In accordance with § 340.6(e) of the regulations, APHIS will publish a notice to inform the public of their preliminary decision to

1 Under NEPA regulations, the “human environment” includes “the natural and physical environment and the relationship of people with that environment” (40 CFR §1508.14).5 extend the determination of nonregulated status of GA21 to Maize Line HCEM485 along with the extension request submitted by Stine and APHIS’ PPRA

. Issues Considered

The list of resource areas considered in this EA w ere developed by APHIS through experience in considering public concerns and issues raised in public comments submitted for other EAs of GE organisms. The resource areas considered also address concerns raised in previous and unrela ted lawsuits, as well as issues that have been raised by various stakeholders in the past. The resource

areas considered in this EA can be categorized as follows:

Agricultural Production Considerations:

• Acreage and Areas of Corn Production

• Agronomic/Cro pping Practices

• Corn Seed Production

• Organic Corn Production

Environmental Considerations:

• Soil

• Water Resources

• Air Quality

• Climate Change

• Animals

• Plants

• Gene Flow

• Microorganisms

• Biological Diversity

Human Health Considerations:

• Public Health

• Worker Safety

Livestock Health Considerations:

• Livestock Health /Animal Feed

Socioeconomic Considerations:

• Domestic Economic Environment

• Trade Economic Environment6 

### 2 AFFECTED ENVIRONMENT

2.1 Agricultural Production of Corn

2.1.1 Acreage and Area of Corn Production Corn ( Zea may s, L. ) is an annual grass cultivated in the U.S. in temperate regions with adequate frost

- free days and moisture to promote plant maturity. It is native to the Americas and is referred to by much of the world as maize, a Native American name for the crop ( Hoeft et al., 2000 ) . Corn may be successfully cultivated in many parts of the world , but the U.S. Midwest is the l argest area with ideal conditions in the gently rolling topography, medium soil texture with high

- moisture holding capacity, and temperature and rainfall regimes most favorable to corn production ( Hoeft et al., 2000 )

. Most of the corn produced in the U.S. is hybrid co rn varieties adapted to local environmental and soil conditions . G enerally , corn agronomic characteristics, such as optimal planting timeframe, disease and pest pressures, length of growing period , and water requirements, also vary by region ( Neild and Newman, 1990 ; Hoeft et al., 2000 ; USDA

ERS, 2000 ; Koenning and Wiatrak, 2012 ) . The geographic range of corn production in the U.S. has been expanded by growing the crop under irrigation and breeding programs to increase drought and cold tolerance, shorten length of growing period, and improve disease and pest resistance ( Neild and Newman, 1990 ; Hoeft et al., 2000 ; Corn and Soybean Digest, 2009 ; Carena, 2010 )

. Corn is the largest crop grown in th e U.S. in terms of value ( USGC, 2010 ) , acreage planted, and geographic area of prod uction. It is so adaptable it is cultivated in every continental U.S. state except Alaska, with winter breeding nurseries in Hawaii and Puerto Rico ( Leidy, 2009 ; Alfaro, 2011 ) . The top corn producing states loosely known as the “Corn Belt” are Iowa, Illinois, Nebraska, Minnesota, South Da kota, Indiana, Kansas, Wisconsin, Ohio

, and Missouri and collectively produc e over 80% of U.S. corn ( USDA

- NASS, 2011e ) . Figure 1 presents planted corn acreage in select states of the continental U.S. as of 2010 ( USDA

- NASS, 2011d )

. The amount of corn planted in the U.S. in 2011 totaled about 92.3 million acres, an increase of approximately 4.1 million acres over 2010 ( USDA

- NASS, 2011b ) . From 1991 to 2011, acreage planted with corn increased from just over 76 .0 million acres to about 92 .3 million acres, nearly a 21% increase ( USDA

- NASS, 2011i ) (Figure 2). Over that 20 year span, U.S. production of field corn for grain increased from approximately 7.5 billion bushels (1 91 million metric tons) in 1991 to approximately 12. 4 billion bushels (315 million metric tons) in 2010, and average annual yield had increased approximately 41% from 108.6 bushels per acre in 1991 to 152.8 bushels per acre in 2010 ( USDA

- NASS, 2011e ) . At the same time, the use of corn for bioethanol production substantially contributed to the expansion in U.S. corn acreage. Between 2000 and 2009, U.S. ethanol production increased by nine billion gallons, accompanied with in creased demand for feedstock ( Wallander et al., 2011 ) . Over the same period, the amount of harvested corn acreage increased by about 7.2 million acres, although, the change in corn production was not only driven by energy prices, but by other m a rket forces such as exchange rates, increased global demand for meat, and weather conditions ( USDA

- OCE, 2011 ; Walla nder et al., 2011 )

. H igh prices as a result of increased demand for ethanol feedstocks and meat are expected to increase corn production through 2020 ( USDA

- OCE, 2011 )

.7 Source: ( USDA

- NASS, 2011d ) Figure 1

. The 201 0 estimated amount of planted corn acreage by U.S. county in selected states. Estimates range from those counties that had less than 10,000 acres of planted corn to those with 150,000 acres or more, and also reflect those counties not included in the estimation.

Corn is also used for forage and silage animal feed. From 1991 to 2010, acreage devoted to growing corn for silage decreased from approximately 6.1 million acres to approxima tely 5.6 million acres; however, annual production of corn silage also increased 32% over that period from approximately 81 .2 million tons to nearly 107.3 million tons ( USDA

- NASS, 2011e )

. As of 2011, approximately 88% of a ll corn planted in the U.S. is GE

. Forty

- nine percent are stacked (multiple) gene varieties having both herbicide

- and insect

- resistant traits (Figure 3) ( USDA

- ERS, 2011a )

. Herbicide

- resistant varieties account for 2 3 % , and insect

- resistant

- only cultivars comprised 16% . Other value

- added corn GE traits include enhanced oil, starch, or nutritional characteristics and drought tolerance ( USGC, 2010 ; USDA

- APHIS, 2012 ) . The first herbicide

- resistant corn variety released in 1995 was glufosinate resistant and the first stacked hybrid varieties were released in 1997 ( USDA

- APHIS, 2012 ) . The adoption of herbicide

resistant corn w as relatively low in 2000 ( approximately 6%) , yet all states surveyed as part of the Economic Research Service ( ERS ) corn estimating program steadily increased their adoption through 2011 (Figure 4) ( USDA

- ERS, 2011a ) . The amount of herbicide

- resistant

- only corn planted in the U.S. increased between 2000 and 2007 from 6% to 24% of all planted corn, yet has remained relatively steady since t hen at 22% to 23% of all planted corn ( USDA

- ERS, 2011a )

. In a ddition, adoption of stacked corn varieties ( those containing both herbicide

- and insect

- resistant traits ) increased from 1% in 2000 to 49% in 2011 ( USDA

- ERS, 2011a )

.8 Source: ( USDA

- NASS, 2011j ) Figure 2

. The amount of planted and harvested corn acreage in millions of acres within the U.S. from 1991 through 2011.

Source: ( USDA

- ERS, 2011a ) Figure 3

. The percentage of U.S. planted corn acreage with GE varieties from 2000 through 2011. All GE varieties are inclusive of insect

- resistant

- only ( Bacillus thuringiensis (Bt)), herbicide

- resistant

- only, and stacked varieties (having both insect

- and herbicide

resistant traits).9 0 10 20 30 40 50 60 70 80 90 100Percent of all corn planted

Survey State 2000 2005 2011
Source: ( USDA

- ERS, 2011a )
1 Estimates published individually beginning in 2005.
2 Includes all other states in the corn

- estimating program. Figure 4

. The adoption, as a percentage of all planted corn, of herbicide

- resistant corn (including herbicide

- resistant

- only and stacked herbicide

- and insect

- resistant varieties) in 2000, 2005, and 2011 of corn estimating program states.

Each year, the ERS updates its ten

- year projections of supply and utilization fo r major field crops, including corn, soybeans, and wheat grown in the U.S. The ERS long

- term projections are a conditional scenario based on specific assumptions about the macroeconomy, agricultural and trade policies, the weather, and international devel opments ( USDA

- OCE, 2011 )

. Factors incorporated into the projection models include global economic growth, population trends, the value of the U.S. dollar and other currencies, oil prices, U.S. and international agricultural policy, the U.S. and international biofuels sector, lives tock and meat trade, and prices ( USDA

OCE, 2011 ) . Long

- term projections show planted corn retaining its recent gains, maintaining between approximately 9 0 and 92 million acres a year through 2020 ( USDA

- OCE, 2011 ) . The projected stability of U.S. planted corn acreage for the period is attributed to increas ed export competition, leveling of ethanol production based on corn, and continued higher price realization and yields, among other factors ( USDA

- OCE, 2011 ) . Yields are projected to substantially increase; 2011 yields were 154.3 bushels per acre and are projected to increase to 18 0.0 bushels per acre by 2020 ( USDA

- OCE, 2011 )

.

2.1.2 Agronomic Practices Agronomic practices associated with corn production include several crop management systems that are available to producers. Conventional farming in this document refers to any farming system where synthetic pesticides or fertilizers may be used. This ty pe of farming broadly10 includes occasional use of pesticides and fertilizers to those that depend on regular inputs for successful crop production. This definition of conventional farming also includes the use of GE varieties that are no longer subject to the regulatory requirements of 7 CFR part 340 or the Plant Protection Act. Organic systems exclude certain production methods

, such as synthetic agricultural inputs and GE crops, and are discussed in more detail below. Although specific crop production practices vary according to geographic area and end

- use market, they commonly include tillage, irrigation, agricultural inputs s uch as fertilizers and pesticides, and crop rotation systems. The following introduces the basic cultivation requirements of corn and the agronomic practices commonly employed to produce corn in the U.S. More detailed information regarding the biology of corn may be obtained by consulting Stine’s Request for Extension of Determination of Nonregulated Status to the Additional Regulated Article: Maize Line HCEM485 (APHIS Number 09

- 063

- 01p) or APHIS’s Plant Pest Risk Assessment for Maize Line HCEM485 ( Stine, 2010 ; USDA

- APHIS, 2011b )

.
Cultivation Corn ( Zea mays ssp

. mays L.) is a member of the Poaceae grass family ( OECD, 2003 )

. Corn was originally domesticated from various wild relatives in the teosinte taxa ( Z. Mexicana ) in South Mexico and Central Amer ica approximately 10,000 years ago ( Matsuoka et al., 2002 )

. Cultivated corn is sexually compatible with other members of the genus Zea , and to a much lesser degree with members of the genus Tripsacum grasses , t he closest wild relative with which

corn can interbreed. Teosinte grows in the tropical regions of Mexico, Guatemala, and Nicaragua

. ( USDA

- APHIS, 2011b ) . Three species of Tripsacum ( T. dactyloides, T. floridatum

, and T. lanceolatum ) a re found in the continental U.S. ( OECD, 2003 ) , and two ( T. fasciculatum and T. latifolium ) also occur in Puerto Rico ( USDA

- NRCS, 2011b ) . Corn is an annual plant with male tassels and female silks (i.e., it is monoecious) and is fertilized by windborne pollen, afterwards developing seeds on the cob that requires the assistance of humans to disperse ( OECD, 2003 )

. It freely hybridizes among its many races, as well as with wild annual teosinte and a few Tripsacum grass species, although the latter has not been documented ou tside of experimental breeding ( OECD, 2003 )

. The primary types of corn include dent, flint, flour, pop, and sweet corn, cultivars differ ing in their quantity, quality, and seed (endosperm) composition ( Brown et al., 1985 )

. Corn production in the U.S. is dominated by dent corn. Pr oducers can choose from a large variety of corn lines developed from traditional breeding or GE systems; in 2010 it was estimated there were over 6,000 traited 2 and 1,000 conventional varieties fr om which to choose ( Mons anto, 2011c )

. Corn is highly adaptable, tolerating widely divergent altitudes, sunlight, humidity, and temperature regimes ( OECD, 2003 ) . Corn is a warm weather crop grown in temperate latitudes due to the number of frost free days (110

- 115 days) and moisture needed for its production ( OECD, 2003 )

. The crop requires over 20 inches of rainfall to produce, but yields greatly increase in areas receiving over 30 inches of rainfall ( Brown et al., 1985 ) . Moisture availability within the week after silking is critical, as even one day of drought stress can reduce yields by 8 % ( Duncan et al., 2007 )

. Farmers in areas that predictably have high temperature stress and rainfall deficiencies during critical corn growth stages plant earlier and typically use earlier maturing varieties ( Brown et al., 1985 ) . Corn hybrids in the U.S. are traditionally classified into

2 Traited seeds are hybrid crop seeds that contain transgenic traits.11 15 maturity groups , but actual maturation of a given hybrid can vary primarily based upon temperature and available moisture ( Brown et al., 1985 )

Corn produces best on deep loamy soils, but can be grown in sandy to heavy clay settings ( OECD, 2003 ; Ross et al., 2006 ) . Optimal soil acidity ( pH ) for corn cultivation ranges from 5.8 to 7.0, and key soil nutrients ar e nitrogen, phosphorous, potassium, calcium, magnesium, sulfur

, and micronutrients such as iron, manganese, zinc, and copper ( Espinoza and Ross, 2006 ) . Good drainage is also an important element, as areas with inadequate drainage limit yield ( Ross et al., 2006 ) . Overall, adequate drainage is achieved when there is no standing water in a field 24 hours following rainfall or irrigation ( Tacker et al., 2006 )

. Depending upon the specific location, c orn i s typically planted from mid

- March to the beginning of July; cor n grown in more southern regions is planted earlier in the year than corn grown in northern regions ( USDA

- NASS, 1997 )

. Howeve r , planting dates have moved earlier given the development of new maize cultivars that are better adapted to cooler soil conditions

, although planting time fluctuates with wet springs ( Kucharik, 2006 )

. Planting date is important (espe cially for full season varieties); however, the critical factor for deciding when to plant is soil condition (i.e., temperature and moisture level), provided planting is accomplished within the timeframe for adequate maturation ( Farnham, 2001a ) . If later planting is necessary, earlier maturing hybrids should be used to lower the po tential of reduced yields.

Planting rates are determined by the germination percentage of the seed used, soil conditions

, and anticipated pest problems; producers usually plant more seed than the intended plant population goal ( Farnham, 2001a ) . Plant population s are established based on a number of decisions and factors

, including but not limited to soil properties, fertili ty, row spacing, yield goals

, and corn cultivar. Carefully planned planting strategies and selection of corn cultivars that thrive in high populations and closer spacing may increase yields ( Leidy, 2009 ; Stine, 2010 ) . In a study in Illinois, Widdicombe and Thelen ( 2002 ) found that average corn yield increased as row width narrowed from 76 centimeters to 56 and 38 centi meters (approximately 2 feet 6 inches to 1 foot 10 inches and 1 foot 3 inches), and that the highest plant density evaluated (90,000 plants per hectare) had the highest grain yield. However, in a study that compared row spacing in Iowa, Farnham ( 2001b ) found that there was no statistical difference in yields between corn planted with 76 c entimeter row spacing and that planted in 38 centimeter row spac ing, although it was found that some hybrids tested had greater yield when planted in the decreased row spacing width, while other hybrids had greater yields in rows with wider spacing.

The determination of when i s the best time to harvest include s considerations such as the price of corn, potential yield, the length of the harvest period, weather, and equipment and labor costs, all of which can change during the course of the harvest season ( Bitzer et al., No Date )

. Harvesting corn is done mechanically and varies based on the region. For example, harvest in Kansas typically occurs from early September to mid

- November, depending on the weather condit ions, while harvest in North Dakota begins in late September and ends in late November ( Olson and Sander, 1988 ; USDA

- NASS, 1997 ) . The extent of kernel damage to field corn while mechanically harvesting is dependent on its moisture content ( Huitink, 2006 ) ; hence

, corn ear moisture is factored into the dete rmination of when to harvest. Field corn must be dried to 12% moisture content for storage extending longer than a few months ( Gardisser, 2006 ) ; t hus, economical harvest timing is dependent upon drying cost, any high moisture discounts levied12 upon sale, field loss, and damage penalties ( Huiti nk, 2006 ) . Corn harvested for silage is accomplished earlier than for grain, when standing plants still contain 65% to 70% moisture, just before physical maturity at the R7 growth stage ( Lee et al., 2005 )

. Crop Rotation Crop rotations are used to optimize soil nutrition and fertility, and reduce weeds, insects

, and disease problems ( Olson and Sander, 1988 ; Hoeft et al., 2000 ; Cartwright et al., 2006 ; McLeod and Studebaker, 2006 ; Leikam and Megel, 2007 ; Green and Owen, 2011 ) . Crop rotation is the successive planting of different crops in the same field over a particular period of years. Crop rotation has two primary goals : sustaining the productivity of the agricultural system and maximizing economic returns ( Hoeft et al., 2000 ) . Sustaining the agricultural system is achieved by r otating crops that may improve soil health and fertility with more commercially beneficial “cash crops”

. Crops in the legume family fix nitrogen in soil, improving the yield of following crops such as corn or wheat ( Berglund and Helms, 2003 ) . Moreover , the rotation of crops can effectively reduce disease, pest incidence, weediness, and selection pressure for weed resistance
to herbicides ( USDA

- ERS, 1997b ; Berglund and Helms, 2003 ) . Crop rotation may also include fallow periods, or sowing with cover crops to prevent soil erosion and to provide livestock forage between cash crops ( Hoeft et al., 2000 ; USDA

- NRCS, 2010a ) . Maximizing economic returns is realized by rotating crops in a sequence t hat efficiently produces the most net returns for a producer over a single or multi

- year period. Many factors at the individual farm level affect the choice of crop rotation system to use, ranging from soil type present in an individual field to expected commodity price, the need to hire labor, the price of fuel, the availability of funding to buy seed, and the price of agricultural inputs ( Hoeft et al., 2000 ; Langemeier, 2007 ; Duffy, 2011 )

. Crops used in rotation with corn vary regionally and include oats, peanut, soybean, wheat, rye

, and forage ( USDA

- APHIS, 2011b ) . In 2010, 71% of corn acreage in 19 sur veyed states was under some form of rotation ( USDA

- NASS, 2011c )

. Cropland used for corn and soybean produ ction is nearly identical in many areas, such as Illinois, where over 90% of the cropped area is planted in a two

- year corn

- soybean rotation ( Hoeft et al., 2000 )

. R eturns for producers from

corn

- soybean

- corn are variable

, dependent upon the price and projected yield o f both corn and soybean for an individual operator ( Stockton, 2007 )

. Recently, t here has been an increase in continuo us corn rotations given the profitability of corn production ( USDA

- ERS, 2011d ) and the strong demand for grain ( USDA

- OCE, 2011 )

. Continuous corn rotations require more fertilizer treatments to replace diminished soil nitrogen levels and more pesticide applicati ons ( Bernick, 2007 ; Laws, 2007 ; Erickson and Alexander, 2008 ) . Producers planting continuous corn are more likely to rely on GE varieties to compensate for the increase d risk of corn pests and limited options of herbicides that come with growing corn over several consecutive years ( Erickson and Alexander, 2008 ) . S ince more crop residue is produced, additional tillage prior to planting is necessary to prevent interference with mechanical planters or the application of fertilizer, and facilitate springtime warming of the soil ( Bernick, 2007 ; Laws, 2007 ; Er ickson and Alexander, 2008 )

. More corn residue accumulation also contributes to higher potential for disease and insect infestation in continuous corn rotations ( Laws, 2007 ; Nafziger, 2011 )

. Crop residues are materials left in an agricultural field after the13 crop has been harvested, including stalks and stubble (stems), leaves

, and seed pods ( USDA

NRCS, 2005 )

. Corn seed left in a field after harvest can grow in a subsequent crop rotation and is known as “volunteer” corn ( USDA

- APHIS, 2011b ) . Subsection 2. 3 .2, Plants Communities

, has a more detailed discussion of this issue and corresponding impacts analysis is found in Subsection 4.4.2, Plants Communities.

Tillage Tillage is used to prepare a seedbed, address soil compaction, incorporate fertilizers and herbicides, manage water movement both within and out of a production field , control weeds

, and reduce the incidence of insect pests and plant disease ( Hoeft et al., 2000 ; Christensen, 2002 ; Fawcett and Towery, 2002 ; Tacker et al., 2006 ; Givens et al., 2009 ; NRC, 2010 ) . A variety of tillage systems accomplishes these goals, with each system defined by the remaining plant residue left on the field. These residues aid in conserving soil moisture and reduce wind and
water

- induced soil erosion ( USDA

- ERS, 1997a ; USDA

- NRCS, 2005 ; Heatherly et al., 200 9 )

. Conventional tillage employs moldboard plows, heavy disks, and chisel plows that disturb soil and leaves less than 15% of crop residue on the surface ( Heatherly et al., 2009 ; Towery and Werblow, 2010 ) . Conservation tillage employs tools that disturb soil less and leave s more crop residues on the surface (at least 30%), whereas no

- till farming only disturbs the soil for planting seed ( USDA

- NRCS, 2005 ; Towery and Werblow, 2010 ) . The choice to till is dependent upon a variety of factors ( Hoeft et al., 2000 ) , such as:

• desired yields;

• soil type and moisture storage capacity;

• crop rotation pattern;

• prevalence of insect and weed pests;

• risk of soil compaction and erosion;

• the need for crop residue or animal waste disposal; and

• management and time constraints.

Tillage may increase yields in some cropping systems and soils, and not in others. For example, if a tillage system increases moisture infiltration, production pote ntially increases in response, but if it also increases denitrification or the incidence of plant diseases, crop yield would likely decrease ( Hoeft et al., 2000 ) . Tillage can impact the amount of agronomic inputs needed to maintain soil fertility and moisture and the amount of agricultural chemicals needed to control insect and weed pests ( Olson and Sander, 1988 ; Hoeft et al., 2000 ; Cerdeira and Duke, 2006 )

. According to USDA Agricultural Resource Management Survey (ARMS) 20 10 data, the average residue remaining on the soil surface after planting corn was 3 4 % and an average of 1.4 tillage operations per corn crop were conducted ( USDA

- ERS, 2011f ) . The plant residue coverage of the soil after planting increased dramatically to 6 5 % for no

- till corn production in 2005; however, no

- till corn production represented only 24% of all corn acres planted in the U.S. ( USDA

- ERS, 2011f ) . In 2010, 62% of planted corn acreage in 19 surveyed states was dedicated
to no

- till or minimum till systems ( USDA

- NASS, 2011c ) . Increases in total acres dedicated to conservation tillage have been attributed to increased use of GE crops, reducing the need for14 mechanical weed control, although the change in tillage practices in corn was less dramatic than other crops such as soybean or cotton

, as many growers of corn had already changed to conservation tillage systems as a means to reduce soil erosion ( Fawcett and Towery, 2002 ; Givens et al., 2009 )

. Agricultural Inputs Depending on the region and practices used, corn pr oduction includes inputs such as irrigation, fertilizer (e.g., synthetic fertilizers, manures, and composts containing nitrogen, phosphorus and potassium), pesticides (e.g.

, insecticides, herbicides), and fungicides ( Olson and Sander, 1988 ; Hoeft et a l., 2000 ; McLeod and Studebaker, 2006 ) . Irrigation provides essential water for growth where rainfall is insufficient or erratic. This issue is discussed in detail in Subs ection 2.2.2, Water Resources

, and the corresponding impacts analysis in Subsection 4.3.2. While most of the corn produced in the U.S. is grown without irrigation, approximately 14.2 % of the harvested grain and silage corn acres were irrigated in 2008, th e latest year with available national statistics reported ( USDA

- NASS, 2011e ; USDA

- NASS, 2011b )

. Soil and foliar macronutrient applications to corn primarily include nitrogen, phosphorous (phosphate), potassium (potash), calcium

, and sulfur, with ot her micronutrient supplements such as zinc, iron, and magnesium applied as needed ( Espinoza and Ross, 2006 ) . A 2010 survey of 19 corn producing states conducted by National Agricultural Statistics Service ( NASS ) found nitrogen was the most widely used fertilizer on corn, applied to 97% of planted acres at an average rate of 140 pounds per acre (l b/Ac) ( USDA

- NASS, 2011c )

. Macronutrient phosphate was applied at an average rate of 60 lb/Ac to 78% of planted corn and potash was applied to 61% of planted acres at the rate of 79 lb/Ac. The survey found sulfur was applied less extensively at a rate of 13 lb/Ac to 15% of acres planted to corn ( USDA

- NASS, 2011c )

. A wide variety of pests can hinder corn production and many require a gricultural pesticidal inputs for their control. Several groups and types of insects can feed on the seeds, roots, stalk, leaf

, and ear of the corn plant, and can reduce yield if not adequately controlled. Major corn insect pests are the seed corn maggot ( Hylemya platura) , European ( Ostrinia nubilalis Hübner) and Southwestern ( Diatraea grandiosella ) corn stalk borer, the Western ( Diabrotica virgifera virgifera LeConte) , Northern ( Diabrotica barberi Smith and Lawrence) , and Southern ( Diabrotica undecimpunc tata howardi Barber ) rootworm, and earworms ( Helicoverpa zea) ( Flanders et al., 2009 ) . Additionally, there are soil nematodes ( microscopic worms) of which the majority are beneficial; however, the few that are parasitic can constitute a significant management issue ( SWCS, 2000 ) and are discussed in more detail in Subsection 2.3.4, Microorganisms

, and corresponding impact analysis in Subsection 4.4.4.

Before deciding to apply insecticides, producers should be relatively sure that yield increases will justify paying for the application cost ( Higgins, 1997 )

. Insect infestation thresholds for the most damaging pests have been established to indicate when control measures are actually
necessary ( Higgins, 1997 ) . The thresholds are commonly based on number of insects found in field sampling surveys and/or in established standard defoliation thre sholds, such as those provided by the National Information System of the Regional Integrated Pest Management Centers in pest management strategic plans ( for example

, see the Field Corn Pest Management Strategic Plan, North Central Region at http://www.ipmcenters.org/cropprofiles/index.cfm ) ( NSF Center for IPM, 2002 )

. In 2010, insecticide activ e ingredients were applied to 12% of acres15 planted to corn in 19 surveyed states ( USDA

- NASS, 2011c ) . T efluthrin was applied on average to the most planted corn acreage at 3% to control corn rootworm , followed by bifenthrin (corn earworm, thrips) , cyfluthrin (corn rootworm, earworm

, European corn borer), lambda

cyhalothrin (corn earworm, European corn borer ) , and tebupirimphos (corn rootworm, seed corn maggot), each equally treating an average 2% of planted corn acreage ( USDA

- NASS, 2011a )

. Producers can m inimize the need to apply pesticides by choosing resistant cultivars (including GE varieties designed to kill particular pests), introducin g beneficial pests that prey on targeted insects, and implementing crop rotation and tillage best management practice s (BMP s ) as discussed above

. Several plant diseases can also reduce corn yield ( Cartwright et al., 2006 ) , many of which are addressed with planting disease

- resistant cultivars, and relatively few that may be treated with fungicides. The most common corn pathogens are fungi, viruses, bacteria, and nematodes. Factors contr ibuting to crop disease include the susceptibility of the plant host, and a favorable air and soil environment ( Stuckey et al., 1 993 ) . Diseases that afflict corn with significant potential for economic loss include fungal corn rusts, cornleaf blights, ear smuts, ear and kernel rot fungi, and maize mosaic viruses ( Cartwright et al., 2006 ) . In 2010, fungicides were applied to 8.0% of acres planted to corn in 19 survey states ( USDA

- NASS, 2011c )

. Weeds are the most important pest complex that interferes with maximum yield and profitability in U.S. ag riculture ; therefore, effective weed management is critically important to sustain a ble production ( Owen et al., 2011 ) . Weeds have the most impact on potential corn yields in the first six weeks after planting and can reduce yields by as much as 50% if they are uncontrolled ( Smith and Scott, 2006 )

. Practices to reduce the incidence of weeds include tillage, crop rotation, intercro pping, the use of ground covers and mulches, flame weeding, and the application of herbicides ( Gunsolus, 2006 ; Hedtke et al., 2006 ; Smith and Scott, 2006 ; CropsReview, 2011 ; USDA

- NASS, 2011c ) . In addition, no

- till pr actices also reduce weed occurrence by minimizing soil disturbance that promotes weed seed germination ( University of California, 2009 )

. Although cultivation contr ols weeds, it prunes corn roots in later growth stages, potentially reducing yields. This fact and the availability of better herbicide technology have driven producers to turn to more chemical weed control than cultivation in corn production ( Smith and Scott, 2006 )

. Herbicides have different ways of acting on plant physiology ( i.e

. , modes of action) to affect the health of a given plant. Some common modes of herbicide action include amino acid inhibitors such as glyphosate and imazethapyr , chlorophyll pigment inhibitors like atrazine, auxin growth regulators including dicamba and 2,4

- D , long chain fatty acid inhibitors such as acetochlor and s

- metolachlor, and glutamine synthase inhibitors such as glufosinate ( University of Wisconsin, No Date ) . Herbicides are applied pre

- emergence to a crop ( i.e

. , “preplant burndown”) and post

- emergence. If herbicides were not available, it is estimated that approximately 20% of yields would be lost to weeds , assuming only tillage and hand weeding remain as the weed manage ment tactic ( Gianessi and Reigner, 2007 )

. H and and mechanical tillage methods to control weeds damage crops, prune roots, and increase plant susceptibility to some diseases

, which decrease yi e ld; furthermore, any delays in mechanica l weed control due to events such as weather increases the chance for crop damage when tillage can resume

, or may cause the loss of crops in sections or an entire field ( Gianessi and Reigner, 2007 )

.16 In 2010, m ore than 98% of corn acr es in 19 surveyed states ( Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Nebraska, North Carolina, North Dakota, Ohio, South Dakota, Ten nessee, Virginia, and Wisconsin) w ere treated with herbicid es and more than two

- thirds of the total pesticides applied to corn in those states were herbicides ( USDA

- NASS, 2011c )

. Of the latter, 66% of the 2010 corn acreage in the surveyed states was treated with glyphosate, 61% with atrazine, and 25% with acetochlor ( USDA

- NASS, 2011c ) . Compared to data collected in a 2005 survey from the same 19 states, glyphosate

- treated planted corn acres increased 35%, atrazine was applied to 5% fewer acres, and acetochlor tr eatments of planted acres increased 2% ( USDA

- NASS, 2007a ; USDA

- NASS, 2011c )

. Th e dramatic increase in the use of glyphosate as a consequence of expanded adoption of the GE trait in corn production is primarily attributed to the herbicide’s effective and efficient weed control as a non

- selective herbicide ( Owen et al., 2011 )

. Its relatively low cost and simplicity of use, coupled w ith minimal animal toxicological and environmental impact, as well as its support of conservation tillage practices makes it a desirable weed management tool and reduces overall production costs ( Duke and Powles, 2009 ; NRC, 2010 ; Green and Owen, 2011 )

. Herbicide usage trends since the adoption of GE technologies are the subject of much debate, with initial assessments indicating a decline in herbicide use in the early years of herbicide

resistant crop production ( Carpenter et al., 2002 ) , while some argue that an increase in the volume of herbicide usage followed as the technology spread ( Benbrook, 2009 ) . Others report a continuing decline in herbicide use with the adoption of GE crops ( Fernandez

- Cornejo and Caswell, 2006 ) and in the amount of herbicide active ingredients applied to corn ( Brookes and Barfoot, 2010 )

. The contradictory findings have been attr ibuted to the different measurement approaches used by researchers, the manner in which different factors affecting pesticide use such as weather or cropping patterns are controlled for, and how collected data is statistically analyzed ( NRC, 2010 )

.
Another observed herbicide trend since the adoption of GE corn has been a substantial reduction in the diversity of herbicide s use d in corn production ( Young, 2006 ) . The use of other herb icides has declined significantly and it is estimated that 34% of corn acres receive only glyphosate for weed management ( NRC, 2010 ; Owen, 2011 ) (Figure 5 ). W eed man agement i s herbicide

- based in both GE and conventional c orn production ; h owever , due to the effectiveness of glyphosate and the ease of its use, the adoption of GE glyphosate

- resistant crops for weed management was the most rapid implementation of a crop technology in the history of agriculture ( Duke, 2011 )

. This trend and its potential impacts to herbicide

- resistant weed development are discussed in Subsection 2.3.2, Plants Communities.17 Source : ( NRC, 2010 ) Figure 5

. A pplication to corn from 1996 to 2008 of glyphosate and other herbicide s in terms of pounds per active ingredient per acre, and the percentage of herbicide

- resistant planted corn.

Maize Line HCE M485 was developed to provide growers another alternative in glyphosate

resistant corn cultivars ( Stine, 2011 ) . T he following presents a summary of the current use and registration of the herbicide glyphosate

. Glyphosate is a non

- selective herbicide and plant growth regulator approved for use on a wide variety of food and non

- food field crops and wherever total veget ation control is desired ( US

EPA, 1993b ) . First registered for use in 1974, glyphosate has been subsequently reregistered in the 1993 Glypho sate Registration Eligibility Decision ( US

- EPA, 1993b ) . Glyphosate is currently under registration review with a decision expected in 2015 ( US

- EPA, 2009a ) . The chemical is formulated in several salt, acid, and ammonium compounds and is registered for use on fruit, vegetables, field crops, lawns and residential settings, industrial rights of way, an d for aquatic weed control ( US

- EPA, 2009a )

. Glyphosate , which is in the glycine herbicide category, inhibits EPSPS production in plants ( Senseman, 2007 )

. Inh i bition of EPSPS reduces the presence of key amino acids required for protein synthesis or necessary for certain metabolic pathways required for plant growth. It absorbs directly through plant leaves and rapidly spreads throughout the plant. Surfactants are used in the herbicide formulation to enable greater glyphosate pen etration into the leaves ( Senseman, 2007 ) . The environmental risk of the surfactant polyethoxylated tallow amine (POEA) in certain glyphosate products will be assessed by the EPA in their current registration review for glyphosate ( US

- EPA, 2009a ) . Glyphosate can be tank mixed w ith other herbicides to minimize the potential for selection of herbicide

- resistant weeds and provide control over a diversity of weed pests ( Thompson and Peterson, 2005 ; Boerboom and Owen, 2006 ; Gunsolus, 2006 ; Owen, 2010 )

.18 2.1.3 Corn Seed Pr oduction

Cornfields in the U.S. are generally planted with hybrid seed because hybrid vigor results in higher and more consistent grain yields . A pproximately 50 to 60 million bushels (1.3 to 1.5 million metric tons) of seed corn are needed annually , which seed companies generally exceed by producing 30 to 40% more than is needed ( Wych, 1988 )

.
Seed corn production occurs regionally with the seed for hybrids adapted to the conditions in the southern U.S

. grown in the South and similarly, hybrids adapted to the norther n U.S. grown in the North ( Stefferud, 2007 ) . Iowa, Nebraska, Indiana, and Illinois represent the region where the most seed corn is produced ( Bennett, 2011 ) . Seed corn is also grown during the winter in nurseries in Hawaii, Puerto Rico, Chile

, and Argentina ( Leidy, 2009 ; Alfaro, 2011 ) , where growing conditions maximize corn growth and productivity. Corn is grown in these nurseries to supplement low seed supplies or provide enough seed of the elite hybrids in greatest demand for planting the next season in the mainland U.S. ( Beckman, 2011 ) . Acreage devoted to corn seed production in winter nurseries is comparatively small. For example, only approximately 7,100 acres were under cultivation for all crop seed production in Hawaii in the 2010/2011 crop year,

com pared to 91.9 million acres of U.S. planted corn in 2011 ( USDA

- NASS, 2011h )

. The U.S. Federal Seed Act of 1939 recognizes seed certification and official certifyin g agencies. Implementing regulations further recognize land history, field isolation, and varietal purity standards for seed. Seed certification is important to e nsure the high quality of corn seed and is accomplished by a wide range of programs which in clude field inspections and laboratory testing ( Bradford, 2006 ; AOSCA, 2011 )

. Various seed associations have standards to help maintain the quality of corn seed. New seed varieties are evaluated by review boards to determine if the varieties meet the eligibility requ irements for certification. The Association of Official Seed Certifying Agencies ( AOSCA, No Date ) defines the classes of seed as follows:

• Breeder seed is directly controlled by the plant breeder that developed the variety.

• Foundation seed is the progeny of Breeder or Foundation seed that is handled to most nearly maintain specific genetic identity and purity.

• Registered seed is a progeny of Breeder or Foundation seed that is so handled as to maintain satisfactory genetic identity and purity.

• Certified seed is the progeny of Breeder, Foundation, or Registered seed that is so handled as to maintain satisfactory genetic identity and purity.

Identity preservation (IP) is distinguished from seed certification as its focus is a rigorous
proc ess to maintain the genetic purity of seed stocks ( Sundstrom et al., 2002 ; Bradford, 2006 ; Bennett, 2011 ) . IP is accomplishe d by following a strict regime of management practices such as seed purity standards, recognizing field history to insure eligibility of the field for seed corn production, meeting field isolation standards to protect from the introgression of pollen from other corn varieties, seed sampling and testing, and record maintenance and labeling ( Sundst rom et al., 2002 )

. Both certification programs and IP have been extremely successful in maintaining the purity and high quality of seed corn product and have provided oversight during the entire process from planting to bagging of the seed corn.19 2.1.4 Organ ic Corn Production In the U.S., only products produced using specific methods and certified under the USDA’s Agricultural Marketing Service (AMS) National Organic Program (NOP) definition of organic farming can be marketed and labeled as “organic” ( USDA

- AMS, 2008 ) . Organic certification is
a process

- based certification, not a certification of the end product; the certification process specifies and audits the methods and procedures by which the product is produce d.

In accordance with NOP, an accredited organic certifying agent conducts an annual review of the certified operation’s organic system plan and makes on

- site inspections of the certified operation and its records. Organic growers must maintain records to show that production and handling procedures comply with USDA organic standards.

The NOP regulations preclude the use of excluded methods. The NOP provides the following guidance under 7 CFR Section 205.105:

...to be sold or labeled as “100 percent orga nic”, “organic” or “made with organic (specified ingredients or group(s)),” the product must be produced and handled without the use of:... (a) Synthetic substances and ingredients,... (e) Excluded methods,...

Excluded methods are then defined at 7 CFR Section 2 05.2 as:

A variety of methods used to genetically modify organisms or influence their growth and development by means that are not possible under natural conditions or processes and are not considered compatible with organic production. Such methods inclu de cell fusion, microencapsulation and macroencapsulation, and recombinant deoxyribonucleic acid ( DNA ) technology (including gene deletion, gene doubling, introducing a foreign gene, and changing the positions of genes when achieved by recombinant DNA tech nology). Such methods do not include the use of traditional breeding, conjugation, fermentation, hybridization, in vitro fertilization, or tissue culture.

Organic farming operations, as described by the NOP, are required to have distinct, defined boundari es and buffer zones to prevent unintended contact with excluded methods from adjoining land that is not under organic management. Organic production operations must also develop and maintain an organic production system plan approved by their accredited c ertifying agent. This plan enables the production operation to achieve and document compliance with the National Organic Standards, including the prohibition on the use of excluded methods ( USDA

AMS, 2008 )

.

Co mmon practices organic growers may use to exclude GE products include planting only organic seed, planting earlier or later than neighboring farmers who may be using GE crops so that the crops will flower at different times, and employing adequate isolatio n distances between the organic fields and the fields of neighbors to minimize the chance that pollen will be carried between the fields ( NCAT, 2003 ) . Although the National Organic Standards prohibit the use of excluded methods, they do not require testing of inputs or products for the presence of excluded methods. The presence of a detectable residue of a product of excluded methods alone does not20 n ecessarily constitute a violation of the National Organic Standards ( USDA

- AMS, 2008 ) . The current NOP regulations do not specify an acceptable threshold level for the adventitious presence of GE materials in an organic

- labeled product. The unintentional presence of the products of excluded methods will not affect the status of an organic product or operation when the operation has not used excluded methods and has taken reasonable steps to avoid contact with the products of excluded methods as detailed in their approved organic system plan ( Ronald and Fouche, 2006 ; USDA

- AMS, 2008 )

. Organic corn production practices include crop rotation, use of cover crops and green manures, animal manures, application of rock minerals such as lime, other soil additives, mechanical weed control, and biological control of pests ( Kuepper, 2002 ) . Weed control can be accomplished with delayed s eeding to avoid spring weeds, applying fertilizer to growing plants to outcompete weeds, increasing seeding rates, s o wing cover crops, crop rotation, intercropping, flame weeding, hand weeding, and mechanical means (e.g.

, tillage) ( Halford et al., 2001 ; Kuepper, 2002 ; Heverton et al., 2008 ; Green and Owen, 2011 ) . Other pest control is accomplished with application of natural pesticides, integrated pest management techniques such as introduction of beneficial organisms in the form of soil predator and parasitic organisms, and practices such as those described for weed control ( NCAT, 2003 ) . Organic crop production historically has also utilized mulch and ridge tillage practices ( NCAT, 2003 ) . However, while no

- till organic corn production has been generally difficult and possibly unsustainable due to weed pests , broadcast flame weeding may be a viable alternative to chemical weed control ( Heverton et al., 2008 )

. NASS and ERS recently reported the organic crop production data collected in 200 8 ( USDA

ERS, 2010a ; USDA

- NASS, 2010a ) . In that year

, 143

, 432 acres of organic corn on 2

, 146 farms in 39 states w ere harvested for grain or seed ; f urthermore, 24

, 871 acres of organic corn on 664 farms in 27 states were harvested as silage or greenchop ; greenchop is the harvest of a crop without allowing it to dry in the field . Iowa, Michigan, Minnesota, New York

, and Wisconsin were the only states with more than 10

, 000 acres of organic corn harvested for grain or seed while only Wisconsin had more than 6

, 000 acres of organic corn grown for silage or greenchop. In contrast, Iowa, Michigan, Minnesota, New York, and Wisconsin combined had approximately 29 million acres of corn harvested in 2008 ( USDA

- NASS, 2008a )

. In 2008, organic corn harvested for grain or seed consisted of about 0.2% of total U.S. corn production ( USDA

- NASS, 2010a ; USDA

- NASS, 2011e )

.
2.2 Physical Environment

2.2.1 Soil Quality Soil consists of solids (minerals and organic matter), liquid, and gases. This body of inorganic and organic matter is home to a wide variety of fungi, bacteria, and arthropods, as well as the growth medium for terrestrial plant life ( USDA

- NRCS, 2004 ) . Soil is characterized by its layers that can be distinguished from the initial parent material due to additions, losses, transfers, and transforma tions of energy and matter ( USDA

- NRCS, 1999b ) . It is further distinguished by its ability to support rooted plants in a natural environment. Soil plays a key role in determining the capacity of a site for biomass vigor and production in terms of physical support, air, water, temperature moderation, protection from toxins, and nutrient availability. Soils also determine a site’s susceptibility to erosion by wind and water, and a site’s flood attenuation capacity.21 Soil properties ch ange over time: temperature, acidity or alkalinity (pH), soluble salt s, amount of organic matter, the carbon

- nitrogen ratio, and numbers of microorganisms and soil fauna all change seasonally as well as over extended periods of time ( USDA

- NRCS, 1999b ) . Soil texture and organic matter levels directly influence soil shear strength, nutrient holding capacity, and permeability. Soil taxonomy was established to classify soils according to the relationship between so ils and the factors responsible for their character ( USDA

- NRCS, 1999b ) . Soils are organized into four levels of classification, the highest b eing the soil order. Soils are differentiated based on characteristics such as particle size, texture, and color, and classified taxonomically into soil orders based on observable properties such as organic matter content and degree of soil profile develo pment ( USDA

- NRCS, 2010c ) . The Natural Resources Conservation Service (NRCS) maintains soil maps on a county level for the entire U.S. and its territories.

Corn is able to grow in a wide variety of soils with irrigation, but g rows best in deep, well

drained, medium

- to coarse

- textured soils ( Ross et al., 2006 ; Wright et al., 2009 ) . Corn needs a variety of nutrients: primarily nitrogen, phosphorus, and potassium, as well as secondary nutrients such as calcium, magnesium, and sulfur at various levels ( Espinoza and Ross, 2006 )

. Corn also requires smaller amounts of micronutrients such as iron, zinc, copper, b oron, manganese, molybdenum, and cobalt. The availability of nutrients is influenced by the soil pH, with the desirable range for corn of 5.8 to 7.0. Soil with a pH below 5.7 generally requires amendment with lime ( Espinoza and Ross, 2006 )

. Land management practices for corn cultivation can affect soil quality. While management practices such as tillage, fertilization, the use of pesticides, and other management tools can improve soil health, they can also cause substantial damage if not pro perly used. Several concerns relating to agricultural practices include increased erosion, soil compaction, degradation of soil structure, nutrient loss, increased salinity, change in pH, and reduced biological activity ( USDA

- NRCS, 2001 )

. As discussed in Subsection 2.1.2, Agronomic Practices, conventional and conservation tillage are practiced in the cultivation of corn. Reducing excessive tillage through practices such as

conse rvation tillage minimizes the loss of organic matter and protects the soil surface by leaving plant residue on the surface. Management of the residue is one of the most effective conservation methods to reduce wind and water soil erosion, and also benefit s air and water quality and wildlife ( USDA

- NRCS, 2006a )

. Residue management that uses intensive tillage and leaves low amounts of cro p residue on the surface result s in greater losses of soil organic matter (SOM). Intensive tillage turns the soil over and buries the majority of the residue, stimulating microbial activity and increasing the rate of residue breakdown ( USDA

- NRCS, 1996 ) . The residues left after conservation tillage increases organic matter and improves infiltration, soil stab ility and structure, and soil microorganism habitat ( Fawcett and Caruana, 2001 ; USDA

- NRCS, 2006b ) . Organic matter is probably the most vital comp onent in maintaining soil quality ( USDA

- NRCS, 1996 ) :

• it maintains soi l stability and structure;

• reduces the potential for erosion;

• provides energy for microorganisms;

• improves infiltration and water holding capacity;22 • is important in nutrient cycling;

• increases cation exchange capacity 3 ; and

• breaks down pesticides.

The incre ased residue from conservation tillage increases SOM in the top three inches of the soil and protects the surface from erosion while maintaining water

- conducting pores. Soil aggregates in conservation tillage systems are more stable than that of conventio nal tillage due to the products of SOM decomposition and the presence of soil bacteria and fungal hyphae (filamentous structures that compose the main growth) that bind aggregates and soil particles together ( USDA

- NRCS, 1996 ) . Although soil erosion rates in crop production are dependent on numerous local conditions such as soil texture and crop, a comparison of 39 studies contrasting conventional and no

- till practices found that, on average, no

- till practices were 20 to 488 times more effective in reducing erosion than conventional tillage ( Montgomery, 2007 ) . This reduction enables soil production to nearly replace soil losses from erosion. From 1982 through 2003, erosion on U.S. cropland dropped from 3.1 billion tons per year to 1.7 billion tons per year ( USDA

- NRCS, 2006a ) . This can partially be attributed to th e increased effectiveness of weed control through the use of herbicides and corresponding reduction in the need for mechanical weed control that facilitates no

- till crop production ( Carpenter et al., 2002 )

. Conservation tillage also minimizes soil compaction due to the reduced number of t illage trips. Other methods to improve soil quality includes careful management of fertilizers and pesticides; use of cover crops to increase plant diversity and limit the time soil is exposed to wind and rain; and increased landscape diversity with buffe r strips, contour strips, wind breaks, crop rotations, and varying tillage practices ( USDA

- NRCS, 2006b )

. While conservation tillage does have several benefits for soil health, some management concerns

ar e associated with its use. Under no

- till practices, soil compaction may become a problem as tillage is useful for breaking up compacted areas ( USDA

- NRCS, 1996 ) . Likewise, not all soils (such as wet and heavy clay soils) are suited for no

- till. Also, no

- till practices may lead to increased pest occurrences that conventiona l tillage is better suited to managing ( NRC, 2010 )

. There are a multitude of organisms associated with soils ranging from microorganisms to larger organisms such as worms and insects. The microorganisms that m ake up the soil community include bacteria, fungi, protozoa, and nematodes that are responsible for a wide range of activities that impact soil health and plant growth. Decomposers such as bacteria, actinomycetes (filamentous bacteria), and saprophytic fu ngi degrade plant and animal remains, organic materials, and some pesticides ( USDA

- NRCS, 2004 ) . Other organisms, such as protozoa, mites, and ne matodes, consume decomposer microbes and release macro

- and micronutrients, making them available for plant usage. Another important group of soil microorganisms are the mutualists. These are the mycorrhizal fungi, nitrogen

- fixing bacteria, and some free

- living microbes that have co

- evolved with plants that supply nutrients to and obtain food from their plant hosts ( USDA

- NRCS, 2004 ) . Plants also have both direct and indirect impacts on the

3 A cation is an element ion with a positive charge (missing electrons) such as iron (Fe 2+ ), manganese (Mn 2+ ), calcium (Ca 2+ ), potassium (K + ) and sodium (Na + ). Cation Exchange Capacity is a term used to describe the ability of soil anions (negatively charged clay, organic matter and inorganic minerals such as phosphate, sulfate, and nitrate) to adsorb and store soil cation nutrients (such as potassium, calcium and ammonium).23 chemical, physical, and biological characteristics of soil. Plant root exudates play a major role in the microbial community structure and resource availability in the rhizosphere ( Bais et al., 2006 )

. Because of the close association with bacteria, fungi, actinomycetes, and other soil microbes,

corn roots play a key role in influencing nutrient cycling and availability necessary for plant growth ( OECD, 2003 )

. Pesticide use has the p otential to affect soil quality due to impacts to the microbial community, and is discussed further in Subsection 2.3.4, Microorganisms. Glyphosate is rapidly and tightly adsorbed in soil; its adsorption rate is minimally influenced by organic matter, the amount of clay, silt

, or sand, and pH, although soil high in phosphate decreases its adsorption ( Senseman, 2007 ) , making it more available for plant uptake, microbial degradation, and leaching ( Kremer and Means, 2009 ) 4 . Glyphosate is microbiall y degraded in soil and water and the rate of decomposition varies with the microbial structure and population, having an average soil residual half

- life of 47 days ( Senseman, 2007 ) . It has been reported that g lyphosate appears to interact with manganese by forming insoluble, stable complexes that either immobilize this ele ment, reducing plant uptake, or preventing reduction in the plant, making it unavailable ( Eker et al., 2006 ; Neumann et al., 2006 ; Ozturk et al., 2008 ; Cakmak et al., 2009 ; Huber, 2010 ) . Huber ( 2010 ) and Cakmak ( 2009 ) also reported that glyphosate is a broad

- spectrum chelate of several other nutrients (e.g., iron, calcium, magnesium, copper, iron, nickel

, and zi nc); however, these assertions are not without debate. Hartzler ( 2010 ) agrees that glyphosate could immobilize essential elements temporarily, but offers that it does not specifically target manganese o r any other particular element, but instead targets those cations that are most prevalent in the soil. Hartzler ( 2010 ) also reports that areas in which glyphosate interactions with manganese nutrition are reported are also areas with known soil manganese deficiencies. Camberato ( 2010 ) points out that manganese deficiency is not a new phenomenon and is also associated with high pH, low moisture, or high levels of organic matter ; f urthermore, manganese deficiency is easily recognizable and can u sually be resolved through foliar application(s) of manganese fertilizers.

2.2.2 Water Resources The principal law governing pollution of the nation’s water resources is the Federal Water Pollution Control Act of 1972, better known as the Clean Water Act (CWA) . The Act utilizes water quality standards, permitting requirements, and monitoring to protect water quality. The EPA sets the standards for water pollution abatement for all waters of the U.S. under the programs contained in the CWA, but, in most cases, gives qualified States the authority to issue and enforce permits. Drinking water is protected under the Safe Drinking Water Act ( SDW A) of 1974 (Public Law 93

- 523, 42 U.S.C. 300 et seq .).

Surface water in rivers, streams, creeks, lakes, and reservoirs s upports everyday life by providing water for drinking and other public uses, irrigation, and industry ( USGS, 2011 ) . In 2005, about 77% of the freshwater used in the U.S. came from surface

- water sources, whereas the other 23% came from groundwater ( USGS, 2011 ) . Groundwater is the water that fills cracks and other openings in beds of rocks and sand ( USGS, 2009 ) . Each drop of rain that soaks into the soils moves downward to the water table, which is the water level in the groundwater reservoir.

4 Adsorption i s a scientific term used to describe the “ adhesion ” of atoms, ions, or molecules onto a surface, whereas absorption refers to the transfer of a substance into another substance or medium.24 The CWA (33 U.S.C. 1251 et seq .) establishes the basic structure for regulating discharges of pollutants into the waters of the U.S. and re gulating quality standards for surface waters. It is the cornerstone of surface water quality protection in the U.S.; however, it does not deal directly with groundwater or with water quantity issues. Surface water is an important natural resource used f or many purposes, especially irrigation and public supply of drinking water and for everyday uses. The CWA employs a variety of regulatory and non regulatory tools to sharply reduce direct pollutant discharges into waterways, finance municipal wastewater t reatment facilities, and manage polluted runoff ( US

- EPA, 2008a ) . It also provides resources to help manage nonpoint source pollution (NPS). NPS is caused by rainfall, snowmelt, or irrigation moving over and through the ground that picks up and carries with it natural and human

- made pollutants, depositing them into l akes, rivers, wetlands, coastal waters, and groundwater ( US

EPA, 2011f )

. The SDWA is the main Federal law that ensures the quality of U.S. drinking water. Under the SDWA, the EPA sets national health

- based standards for drinking water quality to protect against both naturally

- occurring and man

- made contaminants that may be found in drinking water. The EPA also oversees the states, localities, and water suppliers who implement those standards ( US

- EPA, 2011g ) . The Sole Source Aquifer (SSA) designation under the SDWA is used to protect drinking water supplies in are as with few or no alternative groundwater resources, and where if contamination occurred, using an alternative source would be extremely expensive ( US

- EPA, 2011h ) . The EPA defines SSA as an aquifer that supplies at least 50% of the drinking water consumed in the area overlying the aquifer. There are 77 designated SSAs in the U.S. and its territories ( US

- EPA, 2011h )

. Agriculture is one of the largest users of water in the U.S. Approximately 40% of the water withdrawn from U.S. surface and groundwater sources is used for agricultural irrigation ( CAST, 2009 ) . Although the proportion of available freshwater used in agriculture v aries widely among geographic areas, it is a major proportion of water use in every area. Corn requires water for germination, photosynthesis, cell structure and fullness, and transpiration (i.e., water movement to the atmosphere via movement through the growing plant) ( McClaren, 2009 ) . According to the National Corn Growers’ Association (NC GA) and ARMS data for corn production practices, corn is not as water

- intensive as many other crops; with only about 11 to 11.5% of corn acreage irrigated in 2010 ( NCGA, 2011 )

. The estimated average amount of water applied per irrigated acre was 1 0

. 7 inches ( USDA

- ERS, 2011e )

. The crop yield per irrigated acre in 20 10 was estimated to be 1 74 bushels ( USDA

- ERS, 2011e ) compared to the average for all corn for grain, which in 2010 was approximately 15 3 bushels per year ( USDA

- NASS, 2011e )

. The ERS estimates did not separate corn yield by corn produced for grain versus silage. In 2008, nearly 14 million acres of harvested corn were irrigated ( USDA

- NASS, 2010c )

. Also in 2008, the four Water Resources R egions that irrigate d corn the most included 6.54 million acres in Region 10 ( Missouri ), 1.84 million acres in Region 11 ( Arkansas White

- Red ), 1.16 million acres in Region 08 (Lower Miss issippi), and 0.73 million acres in Region 07 (Upper Mississippi) ( USDA

- NASS, 2010c )

. Agricultural NPS pollution is the primary source of pollutants discharged to rivers and lakes and a major contributor to groundwater contamination ( US

- EPA, 2005 ) . Agricultural activities that cause NPS pollution include poorly located or managed animal feeding operations; overgrazing leading to soil erosion; plowing too often or at the wrong time; and improper, excessive, or25 poorly timed application of pesticides, irrigation water, and fer tilizer. The pollutants that result from agricultural practices include sediment, nutrients, pathogens, pesticides, metals, and salts ( US

- EPA, 2005 )

. Weed management is a critical compo nent to maximize corn yields and maintain a high

- quality harvest free of weed seeds ( Smith and Scott, 200 6 )

. As discussed in S ubs ection 2.1.2

, Agronomic Practices, weed management strategies include using a combination of tillage practices, chemical herbicides, and herbicide

- resistant trait breeding in crops ( Dill et al., 2008 )

. Tillage is an important tool for managing weeds before the planting of crops and after their emergence, but before full crop canopy ( Givens et al., 2009 ) . Reducing tillage and conserving crop residue can produce many water quality benefits, such as less sediment and chemical runoff entering s urface water , reduced usage of pesticides, improved moisture content in soil, and reduced potential for flooding ( Fawcett and Towery, 2002 )

. The increased amount of plant residue on the soil surface serves as a physical barrier to erosion and runoff

, allowing more time for water absorption into the soil ( Locke et al., 2008 ) . There is a strong association between the cultivation of herbicide

- resistant crops and recent improvements in tillage reductio n ( Fawcett and Towery, 2002 ) . Dill et al. ( 2008 ) noted for the period of 2002 to 2006, rates of conventional tillage slightly declined in glyphosate

- resistant corn production compared to non

- GE corn cultivation

, while conservation tillage in glyphosate

- resist ant corn production increased slightly over that time frame . U se of no

- till practices declined during the same period ; however, the rates of no

- till cultivation were similar between glyphosate

- resistant and conventional corn production ( Dill et al., 2008 )

. If resistance to glyphosate occurred, farmers preferred to treat weeds with herbicide mixes or rotations ( Foresman and Glasgow, 2008 ; Johnson et al., 2009 ) . The USDA has documented that 66% of U.S. herbicide

- treated corn acreage in 2010 was treated with glyphosate isopropylamine salt ( USDA

- NASS, 2011c ) . Glyphosate may be applied terrestrially and in aquatic settings ( US

EPA, 200 9b )

. Glyphosate has several formulations including acid and a variety of salts ( US

EPA, 2009b ) . The environmental fate of glyphosa te salts is not well studied, but the EPA assumes glyphosate salts dissociate rapidly to form glyphosate and its counter ion ( US

- EPA, 2009e ) . Glyphosate is highly ad sorbed to most soils , although the amount of organic matter, clay, silt

, or sand content or pH has minimal effects ( Senseman, 2007 ) . It has a typical soil residual half

- life of 47 days ( Senseman, 2007 ) , although reported field half

- lives range from 2.4 to 160 days ( US

- EPA, 200 9e ) . Because glyphosate is so tightly bound to soil, little is transported by rain or irrigation runoff , except as adsorbed to soil particles.

Microbes are primarily responsible for the breakdown of glyphosate, rather than by volatilization or photo

- degradation. The main metabolite of glyphosate microbial degradation is aminomethyl

phosphonic acid (AMPA) ( Rueppel et al., 1977 ; WHO, 200 5 ) . It has also been reported that Pseudomonas spp. bacteria degrade glyphosate, producing the metabolites sarcosine and phosphates ( Shinabarger and Braymer, 1986 ; Borggaard and Gimsing, 2008 ) . AMPA has a similar half

- life in water as glyphosate ( Giesy et al., 2000 ) and is ultimately degraded into carbon dioxide (CO 2 ) and ammonium (NH 4 + ) ( Borggaard and Gimsing, 2008 ) . Because of its low mobility in soil, the potential for glyphosate leaching to groundwater is low and its potential
movement to surface waters at high levels is considered low ( US

- EPA, 2009e ) ; however,26 glyphosate can enter surface and subsurface waters if used in close proximity to water bodies or by runoff from terrestrial applications ( WHO, 2005 )

. In water, glyphosate adsorbs to suspended organic and mineral matter and is broken down primarily by microorganisms. In aerobic water, sediment glyphosate has a r esidual half

- life of 7 days, but in anaerobic aquatic sediment settings its residual half

- life is approximately 208 days ( US

- EPA, 2009e ) . Surfactants may be used with glyphosate because the latter is highly soluble in water and will easily slide off plant surfaces ( US

- EPA, 2009e )

. Coupe et al. ( 2011 ) recently evaluated the fate of glyphosate and its AMPA degradate on a watershed scale in three Mississippi River basin watersheds and compared results to a watershed in France. They found from 0.06 to 0.86% of glyphosate was transported to surface water, although their samples frequently detected both glyphosate and AMPA ( Coupe et al., 2011 )

. Variability was correlated to differences in source strength, rainfall runoff, and flow route. The study concluded the watersheds most at risk for transport of glyphosate have high application rates, rainfall events resulting in overland runoff, and flow routes unfiltered by soil. Glyphosate has not been identified as the cause of impairment to an y water bodies classified as such under Section 303(d) of the CWA 5 ( US

- EPA, 2011i )

.

2.2.3 Air Quality

The Clean Air Act (CAA) requires the maintenance of National Ambient Air Quality Standards (NAAQS). The NAAQS, developed by the EPA to protect public health, establishes limits for six criteria pollutants: ozone (O 3 ), nitrogen dioxide (NO 2 ), carbon monoxide (CO), sulfur di oxide (SO 2 ), lead (Pb), and inhalable particulates (coarse particulate matter ( PM ) greater than 2.5 micrometers and less than 10 micrometers in diameter ( PM 10 ) and fine particles less than 2.5 micrometers in diameter ( PM 2.5 ) ). The CAA requires states to a chieve and maintain the NAAQS within their borders. Each state may adopt requirements stricter than those of the national standard and each is required by the EPA to develop a State Implementation Plan (SIP) that contains strategies to achieve and maintai n the national standard of air quality within the state. Areas that violate air quality standards are designated as non

- attainment areas for the relevant pollutants, whereas areas that comply with air quality standards are designated as attainment

areas. Primary sources of emissions associated with crop production include exhaust from motorized equipment such as tractors and irrigation equipment, soil particulates from tillage and wind induced erosion, particulates from burning of fields, and spraying of herbicides and pesticides. Emissions contributing to greenhouse gases (GHG) associated with global warming are discussed in Subsection 2.2.4, Climate Change.

Since corn is the most widely produced feed grain in the U.S., its production practices can subst antially impact air quality. Tillage exposes soil to wind erosion and utilizes motorized equipment that produces emissions. The use of herbicide

- resistant crops has facilitated the

5 Glyphosate is classified as an organophosphorus pesticide. One wa terbody, Smith Canal in the California Central Valley Region, has been identified as being impaired by organophorphorus pesticides, principally diazinon and chlorpyrifos California RWQCB, Requirement for Technical Report Pursuant to California Water Code Section 13267 (Sacramento: California Regional Water Quality Control Board, 2007), "Specific State Causes for Impairment That Make up the National Pesticides Causes of Impairment Group," 2011i, U.S. Environmental Protection Agency, October 10, <http://iaspub.epa.gov/tmdl_waters10/attains_nation_cy.cause_detail_303d?p_cause_group_id=885>.7

.27 adoption of conservation tillage ( Towery and Werblow, 2010 ) . According to ARMS data, in 2010 conservation tillage ranging from no

- till to reduced

- till conserving about 22 to 65 % of resi dues was utilized on 7 4 .5% of planted corn acres in 2010 ( USDA

- ERS, 2011f ) . Reduced tillage generates fewer particulates ( dust) and potentially contributes to lower rates of wind erosion releasing soil particulates into the air, benefitting air quality ( Fawcett and Towery, 2002 )

. Conservation tillage also reduces equipment emissions due to decreased usage. This is illus trated in Table 1 utilizing the NRCS Energy Estimator: Tillage tool ( USDA

- NRCS, 2011a )

. The tool estimates potential fuel savings of 2,269 gallons or 42% savings per year based upon producing 1,000 acres of no

- till corn compared to conventional till corn in the Urbana, Illinois postal code 6 ; however, NRCS is careful to note that this estimate is only approximate, as many variables could affect an individual operation’s actual savings.

Table 1

. Tota l farm diesel fuel consumption estimate (in gallons per year) for no

- till versus conventional till corn production in the Urbana, Illinois postal code.

Estimate for 1,000 acre
corn crop Tillage method

conventional tillage mulch

- till ridge

- till no - till

Total fuel use 5,399 4,529 4,490 3,130

Potential fuel savings over conventional tillage

-- 870 909 2,269

Total savings

-- 16% 17% 42%

Source: ( USDA

- NRCS, 2011a )

Volatilization of fertilizers, herbicides, and pesticides from soil and plant surfaces also introduces these chemicals to the air. The USDA Agricultural Research Service ( ARS ) is conducting a long

- term study to identify factors that affect pesticide levels in the Chesapeake Bay region airshed ( USDA

- ARS, 2011 ) . This study determined that volatilization is highly dependent upon exposure of disturbed unconsolidated soils and variability in measured compound levels is correlated with temperature and wind conditions. Another ARS study of volatilization of certain herbicides after application to fields has found moisture in dew and soils in higher temperature regimes significantly increases volatilization rates ( USDA

- ARS, 2011 )

. Glyphosate has a low vapor pressure and volatilization from soils is not considered an important dissipation mechanism ( US

- EPA, 1993b )

. Pesticide and herbicide spraying introduce air quality impacts from drift and diffusion. Drift is defined by the EPA as “the movement of pesticide through air at the time of application or soon thereafter, to any site other than that intended for application” ( US

- EP A, 2000 ) . Diffusion is gaseous transformation to the atmosphere ( FOCUS, 2008 ) . Factors affecting drift and diffusion include application equipment and method, weather conditions, topography, and the type of crop being sprayed ( US

- EPA, 2000 ) . The EPA is currently evaluating new regulati ons for pesticide

6 Postal codes are used in the NRCS Energy Estimator to estimate diesel fuel use and costs in the production of key crops for an area.28 drift labeling and the identification of BMPs to control such drift ( US

- EPA, 2009d ) , as well as identifying scientific issues surrounding field volatility of conventional pesticides ( US

- EPA, 2010 )

. Chang et al. ( 2011 ) recently evaluated the occurrence and fate of glyphosate and its degradate AMPA in the atmosphere and rainfall in the Mississippi River basin. They found the frequency of glyphosate in the air and rain was similar to that of other commonly applied herbic ides such as atrazine and metolachlor, but its concentration in rain was higher, primarily due to the widespread use of glyphosate for crop production in the region ( Chang et al., 2011 ) . AMPA in air was sampled at a range of <0.01 to 0.97 nanograms per cubic meter, initially lower in the application season and increasing as glyphosate degrade d in soil to produce the metabolite; its incidence in rain was similar to that of glyphosate. The study also investigated the source of glyphosate in the air and found most occurred from spray application rather than volatilization or transport from windb orne soil. Chang et al. ( 2011 ) conclude up to 97% of glyphosate may be removed from th e atmosphere by weekly rainfall greater than 30 millimeters (1.18 inches).

2.2.4 Climate Change Climate change represents a significant and lasting statistical change in climate conditions that may be measured across both time and space. As scientists and the public became more concerned with climate change and the impact that human

- derived air pollutants were having on global temperature, the EPA identified CO 2 , methane (CH 4 ), and nitrous oxide (N 2 O) as the key GHG affecting warming temperatures. While each o f these gases occurs naturally in the atmosphere, human activity has significantly increased the concentration of these gases since the beginning of the industrial revolution. The level of human

- produced gases accelerated even more so after the end of the Second World War, when industrial and consumer consumption flourished. With the advent of the industrial age, there has been a 36% increase in the concentration of CO 2 , 148% in CH 4 , and 18% in N 2 O ( US

- EPA, 2011c )

. U.S. agriculture may influence climate change through various facets of the production process ( Horowitz and Gottlieb, 2010 ) and conversion of land to agriculture. The major sources of GHG emissions associated with crop production are soil N 2 O emissions, soil CO 2 and CH 4 fluxes, and CO 2 emissions associated with agricultural inputs and farm equipment operation ( Adler et al., 2007 ; US

- EPA, 2011c ) . Over the 20

- year period of 1990 to 2009, total emissions in the agriculture sector grew by 9.3%, and in 2009, this sector was responsible for 6.3 % of total U.S. GHG emissions ( US

- EPA, 2011c )

. CH 4 and N 2 O were the primary GHG emitted by agricultural activities. Emissions from intestinal (enteric) fermentation and manure management represent about 20% and 7% of total CH 4 emissions from anthropogenic activities, respectively ( US

- EPA, 2011c ) . Agricultural soil management activities including fertilizer application and cropping practice s were the largest source of N 2 O emissions, accounting for 69% of all U.S. N 2 O emissions ( US

- E PA, 2011c )

. Agricultural practices that produce CO 2 emissions include liming and the application of urea fertilization to agricultural soils. In 2009, the use of lime and urea fertilizers resulted in an increase of 9.9% of CO 2 relative to 1990 emissio ns, mostly attributable to increased urea applications ( US

- EPA, 2011c ) . The agricultural s ector is also responsible for CO 2 emissions from fossil fuel combustion by farm equipment such as tractors as discussed in Subsection 2.2.3, Air Quality. In addition, soil disturbing practices such as tillage can result in the release of soil29 organic carb on (SOC), which occurs in the bodies of microorganisms ( i.e., fungi, bacteria, etc.), in non

- living organic matter, and attached to inorganic minerals in the soil.

From 1991 to 2010, harvested corn acreage increased from approximately 7 5 million acres to over 87 million acres ( USDA

- NASS, 2011e )

, and as of 2011, approximately 72 % of all corn planted in the U.S. w ere GE herbicide

- resistant varieties ( USDA

- ERS, 2011a ) . As discussed in Subsection 2.2.1, Soil Quality, the introduction of herbicide

- resistant crop varieties may be correlated to the increase in usage of no

- till or conservation tillage agricultu re ( Fawcett and Towery, 2002 ; Givens et a l., 2009 ) . In 1990, prior to the introduction of herbicide

- resistant corn varieties, approximately 8% of corn acreage in the U.S. was treated using the no

- till systems and 43% was treated using conventional tillage practices ( CTIC, 2011 ) ; whereas, in 2008, no

- till systems increased to nearly 21% and conventional tillage decreased to about 35% of U.S. corn production acreage ( CTIC, 2011 )

. While some conserving tillage practices (i.e., ridge till and mulch till) decreased about 1% and 3 % respectively from 1990 to 2008 and reduced tillage rates remained relatively constant at 24% over the same period , overall soil conserving tillage practices increased from about 57% in 1990 to 65% in 2008 ( CTIC, 2011 ) . Increased conservation tillage operations reduce GHG emissions dire ctly through reductions in fossil fuel consumption and accumulation of crop residue ( Brookes and Barfoot, 2006 ) . The relative contribution of conservation tillage to carbon sequestration in soil is variable, dependent upon soil and climate characteristics ( Lal, 2004 ) , as well as cropping systems and the amount of crop residue generated; further, under certain conditions, full inversion tillage may sequester carbon at similar rates as conservation tillage, only at a greater depth in the soil profile ( Angers and Ericksen

- Hamel, 20 08 ; Varvel and Wilhelm, 2011 )

. The impacts of herbicide

- resistant crop varieties on climate change are dependent on many variables including cropping systems, production practices, geographic distrib ution of activities, and individual grower decisions. Agricultural practices produce emissions that may contribute to climate change, and impacts from climate change potentially impact agriculture. Field et al. ( 2007 ) report s that most studies project likely climate

- related yield increases of 5 to 20% for corn, rice, sorghum, soybean, wheat, common forages, cotton, some fruits, and irrigated grains; however, they go on to report that positive impacts would not be observed eve nly across all regions, as certain areas of the U.S. that are currently near climate thresholds are expected to be negatively impacted by such impacts as substantially reduced water resources. In addition, the current range of weeds and pests of agricultu re is expected to change in response to climate change ( USGCRP, 2009 )

.
2.3 Biological Resources This section provides a summary of the biological environmen t and includes an overview of animals, plants, gene transfer, weeds and weediness, microorganisms, and biodiversity. This summary provides the foundation to assess the potential impact to plant and animal communities, and the potential for gene movement.

2.3.1 Animal Communities Animal communities in this discussion include wildlife species and their habitats. Wildlife refers to both native and introduced species of mammals, birds, amphibians, reptiles, invertebrates

, and fish/shellfish. W ildlife species use a wide range of strategies to meet their needs from highly30 adaptable generalists to specialists that require a narrow set of conditions to survive ( Bolen and Robinson, 2003 ) . Wildlife may also occupy a wide array of habitats, including agricultural lands. Agriculture dominates human uses of land ( Robertson and Swinton, 2005 ) . In 2010, 920 million acres (47%) of the contiguous 48 states were devoted to farming, including: crop production, pasture, rangeland, Conservation Reserve Program, Wetlands Reserve Program, or other government program uses ( USDA

- NASS, 2011g )

. How these lands are maintained influences the function and integrity of ecosystems and the wildli fe populations that they support.

For the purposes of this analysis, discussion is limited to vertebrate s and invertebrates that feed on corn and live in and adjacent to cornfields. Corn is commercially produced in all continental U.S. states except for Alaska and is grown in winter nurseries in Hawaii and the Puerto Rico territory ( Leidy, 2009 ; Alfaro, 2011 )

. As a result, a wide array of wildlife species occupy habitats that are within or adjacent to cornfields, although few species directly utilize corn for food or shelter. Corn is, however, a nutrient

- rich source for many waterfowl species for fat synthesis prior to migration ( Krapu et al., 2004 ) . Additionally, d uring the spring

, summer , and fall months, corn fields provide browse for rabbi ts ( Sylvilagus floridana ) ; deer ( Odocoileus virginianus ) ; bears ( Ursidae ) ; squirrels ( Sciurus spp., Spermophilus tridecemlineatus ) ; raccoons ( Procyon lotor ) ; a variety of rodents and small mammals; wild turkey ( Meleagris gallopavo ) ; pheasants ( Phasianus colchicus ); quail ( Colinus virginianus ); and some songbirds while also providing a forage base for insects ( Mattson, 1990 ; Miller and Hazzard, 1996 ; Krapu et al., 2004 ; MacGowan et al., 2006 ; Ohio Division of Wildlife, 2011 ; Palmer et al., 2011 )

. Cornfields also attract species that prey on those animals directly using the field as a food source or habitat, such as predatory b irds and insects feeding on other insects that infest corn ( Quiring and Timmons, 1987 ; Clark et al., 1994 ; Tremblay et al., 2001 )

. During the winter , waste corn provide s a food

source for wildlife

, and if not fall plowed or ha rvested for silage, cornfields provide winter cover ( Ohio Division of Wildlife, 2011 ; Palmer et al., 2011 )

. Cornfields are intensively culti vated lands that provide less suitable habitat for wildlife than adjacent pasture, fallow fields, or windbreaks and shelterbelts. As discussed in Subsection 2.1.2, Agronomic Practices, no

- till corn production that may provide better habitat for some wildlife is practiced in the U.S., but not extensively, with only approximately 24% of planted corn produced under the no

- till system ( USDA

- ERS, 2011f )

. C onservation tillage practices can benefit wildlife through improved water quality, availability of waste grain, retention of cover in fields, and increased populations of invertebrates ( Brady, 2007 ; Sharpe, 2010 ) . Conservation tillage practice s that leave greater amounts of crop residue increase the diversity and density of birds and mammals ( USDA

- NRCS, 1999a )

. Increased residue also provides habitat for insects and other arthrop ods, consequently increasing this food source for insect predators. Insects are important during the spring and summer brood rearing season for many upland game birds and other birds, as they provide a protein

- rich diet to fast growing young, as well as a nutrient

- rich diet for migratory birds ( USDA

- NRCS, 2003 )

.

Insects such as the lady beetle (Coccinellidae), big

- eyed bug (Lygaeidae), ground beetle (Carabidae), lacewing (Chrysopidae), damsel bug (Nabidae), i nsidious flower bug/minute pirate bug (Anthocoridae), assassin bug (Triatominae ), spined soldier bug (Pentatomidae), and parasitoid wasps (e.g., Braconidae, Ichneumonidae) , as well as a multitude of spiders (Order: Araneae) may benefit corn production by p reying on plant pests ( Stewart et al., 2007 ; Iowa State31 University, No Date ) . Other, soil dwelling fau na such as earthworms and arthropods play critical roles in the aeration and turn

- over of soil, processing of wastes and detritus, and nutrient cycling ( ATTRA, 1999 ; USDA

- NRCS, 2004 )

. Conversely, there are many insects and invertebrates that are detrimental to corn crops, such as the corn earworm ( Helicoverpa zea ) , corn rootworm ( Diabrotica spp.), and European corn borer ( Ostrina nubilalis ) ( University of Illinois, 2003 ; University of Illinois, 2004a ; University of Illinois, 2004b )

. Herbicide use for the control of weeds in corn production has the potential to affect wildlife. The environmental effects associated with glyphosate use are summarized in the most recent Glyphosate Reregistration Eligibility Decision ( RED ) Facts ( US

- EPA, 1993a ) . Since 2009

, glyphosate has been under review by the EPA for continued registration o f the herbicide , with a reregistration decision expected in 2015 ( US

- EPA, 2009a )

. Assessments of the toxicity of glyphosate to animal sp ecies indicate registered uses pose a minimal risk to animals

, but the herbicide may cause adverse effects to plants providing animal habitat. Glyphosate is moderately toxic to mammals, no more than slightly toxic to birds

, and practically nontoxic to fish, aquatic invertebrates

, and honeybees ( US

- EPA, 1993a )

. Non

- target exposure for animal habitats typically results from runoff or spray drift ( US

- EPA, 1993b )

. EPA

- approved labels governing use that includes measures such as appr opriate droplet size settings and assessment of wind, weather, and temperature inversion conditions ( Monsanto, 2010 ) . The EPA is also currently evaluating new regulations for pesticide drift labeling and the identification of BMPs to control such drift ( US

- EPA, 2009d ) , as well as identifying scientific issues surrounding field volatility of conventional pesticides ( US

- EPA, 2010 )

. While animals c an also be affected from runoff and drift, ingestion is often the primary cause of exposure. The final work plan for the reregistration review of glyphosate has identified additional data needs concerning potential impacts to terrestrial animals and certa in aquatic species ( US

- EPA, 2009a ) . Part of the EPA reregistration assessment will include an acute avian oral toxicity study for passerine species.

The glyphosate degradate, AMPA, has not been fully evaluate d for ecological risk, which will be undertaken in the current EPA review ( US

- EPA, 2009a ) . Additionally, some inert ingredients used as surfactants applied with glyphosate that increase its absorption are more toxic than glyphosate to aquatic organisms, and will be evaluated for acute toxicity to estuarine and marine mollusks, invertebrates, and fish ( US

- EPA, 2009a )

.

2.3.2 Plants Communities Corn production in the U.S. en compasses a wide range of physiographic regions, ecosystems, and climatic zones since it is grown in every U.S. state except Alaska ( USDA

- NASS, 2011b ; USDA

- NASS, 2011h ) . Plants communities are varied and adapted to local climate and soil, as well as the frequency of natural or human

- induced disturbance ( Smith and Smith, 2003 ) . Non

crop vegetation in cornfields is limited by cultivation and weed control practices used by producers. Plants communities adjacent to cornfields may be other crops, pasturelands, rangelands, grasslands, forest, or conservation covers designed to control soil erosion and wind. Areas adjacent to cornfields are often highly managed to minimize sources of weed and insect invasion, and reduce cover or per ches from which other pests may easily feed on the crop ( Pierce II et al., 2008 )

. Weeds are simply plants growing in areas undesired by humans ( Baucom and Holt, 2009 )

. Weeds are the most important pest complex in agriculture and are represen ted by plants with32 specific characteristics that make these species uniquely adapted to agriculture ( Gibson et al., 2005 ; Baucom and Holt, 2009 ) . Plants that colonize frequently disturbed environments exhibit early germination and rapid growth from seedling to sexual maturity, have the ability to reproduce sexually and asexually and are well

- adapted to agricultural fields ( Baucom and Holt, 2009 ) . Weeds compete with crops for light, nutrients, and water, and therefore, have the potential to significantly affect yields. Their ability to compete with crops depends on the specific weed (e.g., woolly c upgrass ( Eriochloa villosa ) is more competitive than giant foxtail ( Setaria faberi ) ), population density, the diversity of the weed community, and the length of time the weed community has been established in the crop field ( Bosnic and Swanton, 1997 ; Fausey et al., 1997 ; Owen, 1999 )

. Types of weeds encountered in corn production vary by region, but common weed s include common waterhemp ( Amaranthus rudis ) , giant ragweed ( Ambrosia trifida ) , common lambsquarters ( Chenopodium alum ), velvetleaf ( Abutilon theophrasti ), giant foxtail, and horseweed ( Conyza canadensis ) ( Moore, 2012 )

. Loss of corn yield attributable to weeds varies

. Smith and Scott ( 2006 ) estimate that light infestati on may reduce yields 10 to 15%, and heavier infestations potentially reducing yields up to 50%. Bosnic and Swanton ( 1997 ) report a 26 to 35% loss from early emerg ing barnyardgrass, yet this loss drops to less than 6% from barnyardgrass emergence after corn has reached the four

leaf growth stage. Johnson et al. ( 2007 ) found that corn yield was not reduced by early season giant ragweed, yet yield dropped by 19% from season

- long interference. Yield reductions depend on weed prevalence at critical growth stages ( Halford et al., 2001 ; Knezevic et al., 2002 )

. Generally, weeds must be controlled early in the development o f corn in order to protect potential corn yields ( Smith and Scott, 2006 )

. Collectively, the practices used in crop production will ultimately impart selection pressures upon the weed community, resulting in shifts in the relative importance of specific weeds. Agricultural practices with the most impact on weed composition and prevalence are tillage and he rbicide regime ( Owen, 2008 ) . Weed shifts are illustrated by a previously unimportant weed achieving ecological dominance due to changes in production practices (e.g.

, Asiatic dayflower) or the evolution of an herbicide

- resistant weed biotype due to herbicide

- use pra ctices (e.g.

, common waterhemp) ( Owen, 2008 ; Ulloa and Owen, 2009 ) . In aggressive tillage systems, weed divers ity tends to decline and annual grasses and broadleaf plants are the dominant weeds, whereas, in no

- till fields, greater diversity of annual and perennial weed species may occur ( Baucom and Holt, 2009 )

. As described in Subsection 2.1.2, Agronomic Practices, while there are numerous tactics that will provide weed management, herbicides have been the dominant approach in corn production ( Gianessi and Reigner, 200 7 ; Green and Owen, 2011 ) . Herbicide resistance naturally evolves when a plant survives and reproduces after exposure to a dose of herbicide usually lethal to the wild type, passing this ability down to its future generations ( WSSA, 2008 ) . With repeated use of the herbicide, the herbicide

- r esistant plants can quickly reproduce and spread to dominate the plant (weed) population and seed bank ( WSSA, 2011 )

. Currently, there are 3 70 herbicide

- resistant weed biotypes that have been reported representing 200 species and infesting an estimated 570,000 fields globally ( Heap, 2011 ) . Weeds with evolved resistance to glyphosate have increased since the commercial introduction of the Roundup Ready ® glyphosate

- resistant crops in 1996 ( Heap, 2011 ; Owen et al., 2011 ) . It should33 be noted, however, that the GE crop in this case, namely corn, did not directly cause the resistance to evolve as a result of introgression; there are no near

- relative weeds that are compatible with corn ( Ellstrand et al., 1999 ) . As of December 2011, there are 21 weed species with evolved resistance to glyphosate world

- wide and 1 3 in the U.S. (Table 2 ) ( Heap, 2011 ; Owen et al., 2011 ) . In the U.S., it is estimated that 1 1 of the 1 3 glyphosate

- resistant weed species were identified in glyphosate

- resistant crop systems and are widely distributed in regions where agriculture predominates. For example, 15 states have from 2 to 7 weed species with evolved resistance to glyphosate (Table 3 ) ( Heap, 2011 ) . Table 3 illustrates how widespread herbicide

- resistant weeds are in the U.S., as the same 15 states with glyphosate

- resistant weeds have also identified at least 1 weed species with resistance to 3 to 8 herbicide modes of action.

Table 2

. U.S. glyphosate

- resistant weeds as of December 2011.

System Species Year Identified Weeds identified outside of Roundup Ready ® Systems Rigid Ryegrass ( Lolium rigidum ) 1998 Hairy Fleabane ( Conyza bonariensis ) 2003 Weeds identified in Roundup Ready ® Systems Annual Bluegrass ( Poa annua ) 2010 Common Ragweed ( Ambrosia artemisiifolia ) 2004

Common Waterhemp ( Amaranthus rudis ) 2005

Giant Ragweed ( Ambrosia trifida ) 2004 Goosesgrass ( Eleusene indica ) 2010 Horseweed, Marestail ( Conyza canadensis ) 2000

Italian Ryegrass ( Lolium multiflorum ) 2001 Johnsongrass ( Sorghum halepense ) 2005 Junglerice ( Echinochloa colona ) 2008 Kochia ( Kochia scoparia ) 2007 Palmer Amaranth ( Amaranthus palmeri ) 2005 Source: ( Heap, 2011 )

Many of the glyphosate

- resistant weeds are agronomically important and dominant members of weed communities. For example, glyphosate

- resistant Palmer pigweed (amaranth) is a major economic problem in the Southeast U.S.

, while glyphosate

- resistant waterhemp is an economically important weed in Midwestern states ( Culpep per et al., 2006 ; Owen, 2008 ) . Other glyphosate

- resistant weeds of importance include giant ragweed, common lambsquarters , and horseweed ( Owen, 2008 ; Owen et al., 2011 )

. As described in Subsection 2.1.2, Agronomic Practices, the most effective weed management
programs focus on the inclusion of divers e control tactics in addition to herbicides ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 ) . Given that many weeds have evolved multiple resistances to several herbicide mechanisms of action, it is important that herbicide diversity of mechanisms of action also be a factor in herbicide selection. The key consideration to managing herbicide

- res istant weeds is to ensure that the herbicides used continue to have efficacy on the target weeds. Managing weed species that have evolved multiple resistances can be challenging

.34 I n corn production where sufficient herbicide mechanisms of action typicall y are available, Beckie and Reboud ( 2009 ) recommend the use of herbicides in tank mixtures rather than to simply rotate herbicide modes of action. However, in a study of the efficacy of acetolactate synthase ( ALS )

- inhibitor mixt ures, Wrubel and Gressel ( 1994 ) note that not all mixtures meet all the criteria for resistance management, and the use of mixtures for short

- term economic benefit risks increasing widespread resi stance to herbicides. Weed scientists recommend the use of an integrated systems approach of including science

- based crop improvement and farm management tools developed over the last 60 years, and providing producers reasonable and attractive alternative s for effective weed management ( Gunsolus, 2002 ; Beckie, 2006 ; Owen et al., 2011 ; Sellers et al., 2011 )

.

Table 3

. U.S. states with more than one weed species with glyphosate resistance

.

State Number of weed species with glyphosate resistance Number of herbicide modes of action with at least one resistant weed species Arkansas 6 8 California 4 8 Illinois 3 5 Indiana 4 3 Iowa 3 6 Kansas 5 5 Louisiana 2 5 Michigan 2 5 Minnesota 3 4 Mississippi 7 7 Missouri 6 5 North Carolina 2 6 Ohio 3 5 Tennessee 4 6 Virginia 2 4 Source: ( Heap, 2011 )

Corn seeds that overwinter and germinate in subsequent crops are “volunte ers” and are also considered weeds. Domesticated corn needs human intervention to disperse its seeds

, as th ey are tightly bound to the cob and protected within husks ( OECD, 2003 ) . Harvesting and transporting corn from the field can release individual kernels that survive and germinate the following year, but corn is incapable of sustained reproduction outside of agriculture ( OECD, 2003 ) ; thus, has little potential to become a weed outside of cultivated fields (see Subsection 2.3.3, Gene Flow and Weediness

, for an in dept h discussion of feral corn weediness).

Volunteer corn frequently occurs in soybean, cotton, and other crops such as sugar beets, other dry beans, and the following year’s corn crop ( Bernards et al., 2010 ; Monsanto, No Date ; Wilson et al., No Date ) . Volunteer corn can be quite extensive in fields, competing with the desired crop for light, nutrients, and moisture ( Wilson et al., No Date ) and is particularly problematic with short crops such as soybeans and sugar beets. As a result of transgene pollen movement , s ome35 volunteer glyphosate

- resistant corn plants occur in fields even if glyphosate

- resistant corn was not planted the previous year ( Beckie and Owen, 2007 ) . While pollen mediated gene transfer

can occur in corn , as discussed in Subse ction 2.3.3, Gene Flow and Weediness, gene flow in the
crop decreases rapidly with separation distance. Controlling volunteer corn early is the key to preserving yields in these desired crops. Prevention of volunteer corn is achievable by selecting culti vars with adequate stalk strength and ear retention qualities; minimizing disease and insect infestations that result in pre

- harvest ear losses; harvesting corn on time and with equipment having correct settings; and, operating harvest equipment at appropr iate speeds ( Beckie and Owen, 2007 ; Bernards et al., 2010 ; Monsanto, No Date )

. Management could also be accomplished by applying post

- emergence grass herbicides in subsequent broadleaf crops, planting a corn variety resistant to a different m ode of action than the previous corn crop, or performing spring tillage ( Wilson et al., No Date )

. Volunteer corn may be managed and crop damage minimized by early and diligent scouting, mechanical inter

- row cultivation or flame weeding, and the application of herbicides. The most effective herbicides for eliminating volunteer corn are those with efficacy in grasses (i.e.

, graminicides), including glyphosate application to conventional corn volunteers in glyphosate

resistant corn. Controlling glyphosate

- resistant corn in subsequent glyphosate

- resistant broad

leaf crops such as soybean may be achieved by application of acetyl

- CoA synthase ( ACCase )

- inhibitors and ALS herbicides such as Assure II ®, Fusilade®, Select®, Poast®, Raptor®

, and Wolverine® ( Hager, 2007 ; Zollinger et al., 2011 ) . The use of paraquat or an ALS inhibitor such as Finesse® is effective for controlling glyphosate

- resistant corn in wheat ( Martin, 2010 )

. C ontrolling volunteer glyphosate

- resistant corn in cornfields may be achieved by alternating the glyphosate

- resistant corn with non

- GE corn or with GE corn cultivars having resistance to herbicides wit h different modes of action, and then application of that herbicide post

- emergence, such as LibertyLink® and glufosinate ( Beckie and Owen, 2007 ; Wilson et al., No Date )

. Beckie and Owen ( 2007 ) suggest that t he most effective method of controlling volunteer crops is to utilize a combination of these techniques

. The application of an herbicide in corn production has the potential to impact non

- target plants communities through spray drift, volatilization (evaporation), its adsorption to soils incorporated in runoff, lea ching, and cleaning and disposal of the equipment used to dispense it. Factors affecting drift and diffusion include application equipment and method, weather conditions, topography, and the type of crop being sprayed ( US

- EPA, 2000 )

. The EPA is currently evaluating new regulations for pesticide drif t labeling and the identification of BMPs to control such drift ( US

- EPA, 2009d ) , as well as identifying scientific issues surrounding field volatility of conventional pesticides ( US

- EPA, 2010 )

. The environmental effects associated with glyphosate use are summarized in the most recent Glyphosate RED Facts ( US

- EPA, 1993a ) . As mentioned previously, glyphosate is currently under review by EPA for continued registration of the herbicide, with a reregistration decision expected in 2015 ( US

- EPA, 2009a ) . Glyphosate is toxic to most terrestrial and aquatic plants, inducing plant death. The leaching potential of glyphosate is minimal as it tightly adsorbs to soil particles ( Senseman, 2007 ) . It also has a low vapor pressure and volatility from soils ( US

- EPA, 1993b ) . In its 1993 glyphosate reregistration decision, the EPA required additional studies concerning vegetative vigor, droplet size spectrum, and a drift field evaluat ion that did not affect the reregistration eligibility of the herbicide ( US

- EPA, 1993a ) . EPA

- approved labels provide36 det ailed measures to manage spray drift including optimal wind conditions, temperature inversions, humidity, spray droplet size, sprayer boom heights, aerial spraying by aircraft measures, and inclusion of drift reduction additives ( Monsanto, 2010 )

.

2.3.3 Gene Flow and Weediness Gene flow is a biological process that facilitates the production of hybrid plants, introgression of novel alleles (i.e., versions of a gene) into a population, and evolution of new plant genotypes. Gene flow to and from an agro

- ecosystem can o ccur on both spatial and temporal scales. In general, plant pollen tends to represent the major reproductive method for moving across space , while both seed and vegetative propagation tend to promote the movement of genes across time and space.

The rate and success of gene flow is dependent on numerous external factors in addition to the intrinsic reproductive biology of donor/recipient plants ( Chandler and Dunwell, 2008 ; Zapiola et al., 2008 ) . External factors important to pollen

- mediated gene flow include the presence/ abundance/distance of sexually

- compatible plant species; overlap of flowering phenology between populations; wind versus insect po llination; the amount and duration of pollen production; and weather conditions such as temperature, wind, and humidity. Seed

- mediated gene flow also depends on many factors, including the absence/presence/magnitude of seed dormancy

, contribution and part icipation in various dispersal pathways

, and environmental conditions and events.

Corn plants do not produce clonal structures (shoots) that then develop into plants (vegetative propagules) ; t herefore, asexual reproduction and gene flow as a result of dispersal of vegetative tissues does not occur with corn. Corn is self

- compatible and primarily pollinated by wind or gravity with minimal contribution from insect pollination ( McG regor, 1976 ; Thomison, 2009 )

. There are no extant populations of sexually compatible species related to Z

. mays within the continental U.S., its territories, or posse s sions ; therefore, APHIS ( 2011b ) has concluded that there is not a significant risk of gene movement between corn and its wild or weedy maize relatives

. Molecular evidence of gene flow among corn, Z

. mexicana and Z

. mays ssp. parviglumis, has been documented to occur at low frequenc ies among extant populations of these species in Mexico and likely due to historical admixture among native populations in the same geographic area rather than recent introgression ( Ross

- Ibarra et al., 2009 )

. C omplex mechanisms of incompatibility have been described that are barriers to gene flow ( Kermicle and Evans, 2010 )

. While corn and various teosinte species are culturally and biologically similar, and gene exchange between these groups has been documented, no successful weedy species has evolved ( US

- EPA, 2011b )

.

Pollen

- mediated Gene Flow and Mitigation Many varieties of corn are cultivated in the U.S. For gene flow to occur between corn varieties, flowering of the source and sink populations must overlap, pollen transfer mus t occur, embryo/ seeds must develop, and hybrid seed must disperse and establish. Corn is a monoecious (having both male and female reproductive units), out

- crossing, wind

- pollinated crop that produces abundant, large, and heavy pollen. The reproductive morphology of corn encourages cross

-37 pollination between corn plants and there is no evidence (genetic or biological barriers) to indicate that gene flow is restricted between genetically modified, conventional, and organic

corn.

A number of studies have in vestigated pollen dispersal, cross

- fertilization, and gene flow involving corn grain production fields. Sanvido et al. ( 2008 ) reviewed these studies and found that pollen

- mediated gene flow typically decreases to less than 0.5% beyond 50 meters (approximately 164 feet) and proposes this as an adequate isolati on distance for GE cornfields in areas with dense corn production. In comparisons of outcrossing relating to both distance and temporal separation in California and Washington, Halsey et al. ( 2005 ) , found that temporal separation reduced the occurrence of outcrossing, yet the difference was only statistically significant in California due to the rate of crop growth. At both study locations, 200 meters (approximately 656 feet) was found to reduce ou tcrossing to <0.1%. Spatial and temporal isolation can be one of the most effective barriers to gene exchange between corn crop cultivars. Current practices for maintaining the purity of hybrid seed production in corn are typically successful for maintai ning 99% genetic purity, though higher instances of out

- crossing can occur ( Ireland et al., 2006 ) . Requirements and m ethods to ensure seed and crop purity are discussed in more detail in Subsections 2.1.3, Corn Seed Production, and 2.1.4, Organic Corn Production.

Seed

- mediated Gene Flow and Mitigation For gene flow to occur via seeds and result in feral populations of co rn, seeds must disperse and establish in new habitats. Generally, gene flow by seed is dependent on natural dispersal mechanisms, such as water, wind, animals, or by human actions and is favored by characteristics such as small and lightweight seed size, prolific production, seed longevity and dormancy, and long distance seed transport ( Mallory

- Smith and Zapiola, 2008 ) . Corn does not possess the characteristics for efficient seed

- mediated gene flow. Through thousands of years of selective breeding by humans, corn has been extensively modified to depend on human cultivation for survival ( Doebley, 2004 )

. As a result of its domestication, corn is not able to survive in the wild

, and also has several traits that greatly reduce its ability to disperse via seeds ( OECD, 2003 )

. Humans have selected corn to produce seeds that do not shatter and cannot disperse from the cob, and corn seeds are tightly bound within a protective sheath of leaves or husk ( Doebley, 2004 ) . Corn seeds lack dormancy and will not produce a persistent seed bank; additionally, corn seeds are large and heavy and not easily dispersed by wind or water ( Mallory

- Smith and Zapiola, 2008 ) . Any crop seeds that remain on the field after harvest and are viable to germinate the following year in rotation crops are termed volunteers ( Carpenter et al., 2002 ) and considered weeds since they are out of place (see S ubsection 2.3.2, Plants Communities, for a more detailed discussion on volunteer corn). Fortunately, volunteer corn in subsequent crops is relatively easily managed by a combination of agronomic practices and mechanical means, and the application of herbi cides.

Global dispersal of seed leading to adventitious presence in seed or grain stocks has been documented ( Marvier and Van Acker, 2 005 ; Mercer and Wainwright, 2008 ; Dyer et al., 2009 ; Piñeyro

- Nelson et al., 2009 ; Gamarra et al., 2011 ) . Its pres ence can be mitigated by effective quality control analysis of seed prior to sale, coupled with best practices of product stewardship by seed companies and growers. Moreover, compliance with identity preservation protocols38 outlined by organizations such a s AOSCA ( 2003 ) would minimize the potential for inadvertent inclusion of GE crops.

Horizontal Gene Flow The potential for horizontal gene flow from a plant species to bacteria or fungi is unlikely to

occur ( Keese, 2008 ) . There are several bacteria and fungi associated with plants such as commensals, symbionts, parasites, pathogens, decomposers, and those found in herbivore guts; however, there are very few evolutionary examples of horizontal gene transfer f rom plants to bacteria or fungi ( Keese, 2008 ) . Many bacteria (or parts thereof) that are closely associated with plants have been sequenced including Agrobacterium and Rhizobium ( Kaneko et al., 2000 ; Wood et al., 2001 ; Kaneko et al., 2002 ) . There is no evidence that these organisms contain genes derived from plants. In cases where the review of sequence data implied that horizontal gene transfer occurred, these events were inferred to occur on an evolutionary time scale in the order of millions of years ( Koonin et al., 2001 ; Brown, 2003 ) . The FDA has also evaluated horizontal gene transfer from the use of antibiotic resistance marker genes, and concluded that the likelihood of transfer of antibiotic resistance genes from plant genomes to microorganisms in the gastrointestinal tract of humans or animals or in the environment is remote ( US

- FDA, 1998b )

. The probability of gene flow from corn to other organisms is

, therefore

, considered to be unlikely

.

2.3.4 Microorganisms Soil microorganisms play a key role in soil structure formation, decomposition of organic matter, toxin removal, nutrient cycling, and most biochemical soil processes ( Garbeva et al., 2004 )

. They also s uppress soil

- borne plant diseases and promote plant growth ( Doran et al., 1996 ) . The main factors affecting microbial population size and diversity include soil type (texture, structure, organic matter, aggregate stability, pH, and nutrient content), plant type (providers of specific carbon and energy sources into the soil), and agricultural management practices (crop rotation, til lage, herbicide and fertilizer application, and irrigation) ( Garbeva et al., 2004 ) . Plant roots, including those of corn, release a variety of compounds into the soil creating a unique environment for m icroorganisms in the rhizosphere. Microbial diversity in the rhizosphere may be extensive and differs from the microbial community in the bulk soil ( Garbeva et al., 2004 )

.

The structure of soil microbi al communities is highly dependent on plant type, the physical and chemical characteristics of the soil, and climate ( Garbeva et al., 2004 ; Marschner et al., 2004 ; Gupta et al., 2007 ) . As such, potential changes to the soil microbial community as a result of cultivating genetically modified crops has been of research interest ( O'Callaghan and Glare, 2001 ; Kowalchuk et al., 2003 ; Dunfield and Germida, 2004 ) . There are potential direct and indirect impacts from the large

- scale use of GE crops to soil

- and plant

- associated microbial communities, bot h in the rhizosphere and bulk soil ( Lynch et al., 2004 ; Motavalli et al., 2004 )

. Direct impacts include changes to the structural and functional community near the roots due to altered root exudation or the transfer of GE material, or a change in microbial population s due to the changes in agronomic practices used to produce GE crops (e.g., use of agricultural chemicals and fertilizers and tillage). Indirect impacts may arise from changes in the amount and composition of residue from the GE crops.39 Studies to determ ine the impact of GE crops on soil microbial communities are mixed. A review of those investigating the impact of transgenic plants on microbial soil communities completed by Kowalchuk et al. ( 2003 ) found that much of the research examining distinctive microbial traits concluded there were minor or no non

- target effects; only a few found induced targeted alterations to the composition of the microbial community that usually resulted in the inhibition of plant pathogenic organisms. A similar review by Motavalli et al. ( 2004 ) did not find any conclusive evidence that released transgenic plants were causing significant direct impacts on microbe

- mediated soil nutrient transformations and studies of potential indirect impacts were lacking.

Crop rotations influence microorganisms as the chemical and nutrient composition of plants and their residues can promote or suppress diseases, affect levels of organic matter, and diversify nutrient sources for soil biota ( Gupta et al., 2007 )

. Tillage systems can alter the physiological and chemical properties and biological composition of soils. No

- till promot es retention of soil organic matter and concentrates soil microorganism activity at the soil surface, while increasing populations of both disease suppressing and disease promoting fungi, in turn increasing species that feed on fungi ( Gupta et al., 2007 ) . Conventional tillage distributes organisms deeper into the soil, whil e promoting bacteria and bactivorous fauna and increasing residue breakdown accompanied by rapid nutrient mineralization ( Gupta et al., 2007 ) . Water is one of the important factors influencing microbial population structure and activity in soil ; thus irrigation can have a substantial impact

. S oil moisture carries nutrients to microorganisms and supplies hydrogen and
oxygen ( AgriInfo, 2011 )

. Microb es are most active and popul ous in the moisture range of 20% to 60% , while excess moisture conditions can create a low oxygen environment beneficial to anaerobic microflora , and too little will not support soil microbia ( Stark and Firestone, 1995 ; AgriInfo, 2011 )

.

Fertilizers may support soil microorganisms as increased crop growth can lead to increased residues, building soil organic matter. But fertilizers may change the relative acidity of soils that can be detrimental to some microorganisms, and may reduce the beneficial symbiosis of some microorganisms with particular plant species ( Gupta et al., 2007 ) . Pesticides such as fungicides potentially impact fungal microbia.

In a comparison of fields planted with glyphosate

- resistant and conventional corn and cotton, Locke et al. ( 2008 ) found that crops treated with glyphosate had subtle and dynamic differences in soil microbial populations when compared to non

- glyphosate

- resistant crops . The authors surmise that the decreased disturbance of t he soil and increased level of residue as a result of reduced tillage on the glyphosate

- treated crops allowed for a more diverse microbial population. A 10

- year comparison study of GE glyphosate

- resistant and non

- GE corn and soybean by Kremer and Means ( 2009 ) found that glyphosate

- resistant soybeans, even when not treated with glyphosate, had a lower number and mass of root nodules than that of non

- GE soybean, indicating that root exudates from GE crops influence the rhizosphere microbial community.

Glyphosate is readily metabolized by soil microbes, yet its strong adsorption capacity to soil slows this function ( Tu et al., 2001 ) . The average half

- life of glyphosate is 47 days, yet this rate varies depending on soil structure and microbial population ( Senseman, 2007 ) . The primary metabolite from microbial degradation is AMPA, which is further degraded to CO 2 ( US

- EPA, 1993a ; Senseman, 2007 ) . Results of research investigating the impact of glyph osate on the40 microbial community are mixed ( Weaver et al., 2007 ) . For example, Haney et al. ( 2002 ) and Araujo et al. ( 2003 ) report that glyphosate is mineralized by microorganisms that leads to an increase in their population and activity, while Busse et al. ( 2001 ) and Weaver et al. ( 2007 ) found little evidence of changes to soil microorganism’s population and activity, and any declines recorded were small and not consistent throughout the season. It also has been reported that the use of glyphosate increases the colonization of soil

- borne fungal pathogens such as Fusarium ( Kremer and Means, 2009 ; Huber, 2010 ) . Similarly, research by Camberato ( 2011 ) found that some weeds treated with glyphosate a nd other herbicides had increased incidence of fungal infection

, suggesting that some soil fungi are more able to infect a weed after it has been weakened by glyphosate. They point out , however, that plant pathologists have not observed widespread increas es in plant diseases in glyphosate

- resistant corn and soybean. In a review of recent studies investigating a potential link between the use of glyphosate and outbreaks of fungal disease, Powell and Swanton ( 2008 ) did not find sufficient evidence from field trials demonstrating whethe r a causative relationship exists. Additionally, they found that observed link s may be context dependent, as they were found only under controlled laboratory conditions. The authors suggest that to adequately address the effect glyphosate has on fungal d iseases

, f uture investigations should consider additional interactive factors, such as inoculum level, weed abundance and community composition, fertility, cultural practices, climate, and soil properties.

2.3.5 Biodiversity Biodiversity refers to all plants, an imals, and microorganisms interacting in an ecosystem ( Wilson, 1988 ) . Biodiversity provides valuable genetic resources for crop improvement ( Harlan, 1975 ) and also provides other functions beyond food, fiber, fuel, and income. These include pollination, genetic introgression, biological control, nutrient recycling, competition against natural enemies , soil structure, soil and water conservation, disease suppression, control of local microclimate, control of local hydrological processes, and detoxification of noxious chemicals ( Altieri, 1999 ) . The loss of biodiversity results in a need for costly management practices in order to provide these functions to the crop ( Altieri, 1999 )

. The degree of biodiversity in an agroecosystem depends on four primary characteristics: (1) diversity of vegetation within and a round the agroecosystem; (2) permanence of various crops within the system; (3) intensity of management; and (4) extent of isolation of the agroecosystem from natural vegetation ( Southwood and Way, 1970 )

. Agricultural land subject to intensi ve farming practices, such as that used in crop p r oduction, generally has low levels of biodiversity compared with adjacent natural areas. Tillage, seed bed preparation, planting of a monoculture crop, pesticide use, fertilizer use, and harvest result lim it the diversity of plants and animals ( Lovett et al., 2003 )

. Biodiversity can be maintained or reintroduced into agroeco systems through the use of woodlots, fencerows, hedgerows, and wetlands. Agronomic practices include intercropping (the planting of two or more crops simultaneously to occupy the same field), agroforestry, crop rotations, cover crops, no

- tillage, composti ng, green manuring (growing a crop specifically for the purpose of incorporating it into the soil in order to provide nutrients and organic matter), addition of organic matter ( e.g., compost, green manure, animal manure), and hedgerows and windbreaks ( Altieri, 1999 )

. The potential impact to biodiversity associated with agriculture, including the cultivation of GE
crops , is the loss of diversity, which can occur at the crop, farm, and/or landscape scale ( Visser,41 1998 ; Ammann, 2005 ; Carpenter, 2011 ) . In this analysis, crop diversity refers to the genetic uniformity within crops, farm

- scale diversity refers to the level of complexity of organisms within the boundaries of a farm, and landscape

- scale diversity refers to potential changes in land use and the impacts of area

- wide weed suppression be yond the farm boundaries ( Carpenter, 2011 )

. Crop Diversity As indicated in reviews conducted by Carpenter ( 2011 ) , Krishna et al. ( 2009 ) , van de Wouw et al. ( 2010 ) , and Visser ( 1998 )

, it is widely accepted that genetic diversity in crops is beneficial as it may improve yields, pest and disease resistance, and quality in agricultural systems, and that greater varietal and species diversity enable growers t o maintain productivity over a wide range of conditions. There is concern that the adoption of GE technology potentially reduces grower

demand for crop genetic diversity because breeding programs could concentrate on a smaller number of high value cultiva rs, which could reduce the availability of, and demand for, non

- GE varieties ( Krishna et al., 2009 ; Carpenter, 2011 )

. The establishment of large monocultures of genetically homogeneous crops increases the vulnerability of crops to potentially catastrophic damage from pest and disease outbreaks ( Garcia and Altieri, 2005 ) , but this potential is not limited to GE crops. Several summary reviews of relevant research evaluating GE herbicide

resistant soybeans and cotton, however, have provided evidence that the introduction of GE crops has not decreased crop diversity because of widespread use of the traits in multiple breeding programs and the technology enables the introduction of novel genes in crops ( Ammann, 2005 ; Carpenter, 2011 )

. Concern for the loss of genetic variability has led to the establishment of an extensive network of genebanks ( van de Wouw et al., 2010 ) . The National Plant Germplasm System manages an active collection of more than 14,000 accessions of corn at the USDA

- ARS North Central Regional Plant Introduction Station at Iowa State University, Ames, Iowa ( USDA

- ARS, 2005 ) . Managing the active collection involves acquiring, maintaining, evaluating, characterizing, and distributing this germplasm to researchers worldwide, which helps ensure a continuous reservoir of genetic diver sity for future crop development.

Farm

- scale Diversity Adoption of GE technology has the potential to impact diversity at the farm scale by affecting a farm’s biota, including birds, wildlife, invertebrates, soil microorganisms, and weed populations. For example, an increase in adoption of conservation tillage practices is associated with the use of GE herbicide

- resistant crops ( Givens et al., 2009 ) . Less tillage provides more wildlife habitat by allowing other plants to establis h between crop rows. Conservation tillage leaves a higher rate of plant residue and increases soil organic matter ( Hussain et al., 1999 ; Towery and Werblow, 2010 ) , which benefit soil biota by providing additional food sources (energy) ( USDA

NRCS, 1996 ) . In addition, invertebrates that feed on plant detritus and their predators as well as the birds and other wildlife that feed on them, may benefit from increases in conservation tillage practices ( Towery and Werblow, 2010 ; Carpenter, 2011 ) . Ground

- nesting and seed

- eating birds, in particular, have been found to benefit from greater food and cover associated with conservation tillage ( SOWAP, 2007 )

. In addition to conservation tillage, h abitat can be maintained on agricultural lands by managing field edges for wildlife and using several cultural practices such as crop rotations, planting42 grassed terraces, and contour strip planting. Field edges are often not productive, and the cost for cultivation can exceed the crop value ( Sharpe, 2010 ) . Field edges that are allowed to return to volunteer plants such as ragweed ( Ambrosia ), goldenrod ( Solidago ), and aster ( Aster L.) can quickly become suitable habitat for game birds and songbirds ( Sharpe, 2010 ) . Rotating crops with small grains or meadow crops not only serves to reduce erosion and enhance soil properties, this practice also increases plant diversity and provides forage and cover for several wildlife species ( Brady, 1985 ; Sharpe, 2010 ) . Similarly, planting crops in strips along the natural contour of the slope and along grass or fallow strips, otherwise known as contour strip cropping, also increases plant diversity and provide beneficial wildlife habitat ( Brady, 1985 ; Sharpe, 2010 )

.

Herbicide use in agricultural fields may impact biodiversity by decreasing weed quantities or causing a shift in weed species present in the field, which may affect those insects, birds, and mammals that utilize these weeds. The quantity and type of herbicide use associat ed with GE crops, however, is dependent on many variables, including cropping systems, type and abundance of weeds, production practices, and individual grower decisions.

Landscape

- scale Diversity The greatest direct impact of agriculture on biodiversity on the landscape scale results from the loss of natural habitats caused by the conversion of natural ecosystems into agricultural land ( Ammann, 2005 ) . A literature review by Carpenter ( 2011 ) revealed that increases in crop yields, such as may be attained with GE crops ( including herbicide

- resistant corn ) have the potential to reduce impacts to biodiversity by allowing less land to be converted to agriculture than would otherwise be necessary; however, substantial gains in yields have generally not been obtained by herbicide

- resistant cultivars unless higher yielding cultivars are modified with an herbicide

resistant trait ( NRC, 2010 )

.
As with far m

- scale diversity, use of herbicides at the landscape scale also has the potential to impact biodiversity. Area

- wide herbicide application may increase certain populations of invertebrates and wildlife that benefit from conservation tillage, whereas speci es that are dependent on the targeted weeds may be negatively impacted.

Further, potential impacts to landscape

- scale diversity can be related to the effects of herbicides

on non

- target animal and plant species. Assessments of the toxicity of glyphosate to animal species indicate a minimal risk to animals

, but it may cause adverse effects to plants composing the animals’ habitat. As discussed in Subsection 2.3.1, Animal Communities, glyphosate was found by the EPA to be no more than slightly toxic to bi rds, moderately toxic to practically nontoxic to fish, and practically nontoxic to aquatic invertebrates and honeybees ( US

- EPA, 1993b ) . Spra ying herbicides onto crops has the potential for inadvertent contact and damage to

non

- target plants; the EPA is currently evaluating additional labeling requirements concerning BMPs for controlling pesticide spray drift (see Subsection 2.3.2, Plants Commu nities). While herbicide use potentially affects biodiversity, the application of pesticides in accordance with registered uses and label instructions, and careful management of chemical spray drift, minimizes the potential impacts from their use.

In 20 09, the EPA initiated reregistration of glyphosate and has identified additional data needs. Part of the risk assessment will include an acute avian oral toxicity study for passerine species. Additionally, some inert ingredients used a s surfactants are m ore toxic than glyphosate to aquatic43 organisms, and will be evaluated for acute toxicity to estuarine and marine mollusk, invertebrates, and fish ( US

- EPA, 2009b )

.
2.4 Human Health

Corn is used for food, feed, and various other products to which people are exposed. One component of the affected environment is the direct human consumption of p roducts derived from corn, as described below. T his section also addresses exposure to pesticides used on corn.
The majority of corn produced in the U.S. is field or “dent” corn (named for the dent at the crown of the mature kernel) ( USGC, 2010 ) . Field corn is used in a multitude of products which

are also either directly or indirectly consumed by humans . Directly consumed corn products i nclude corn syrup and sweeteners, starches, oil, cereal, beverage and industrial alcohol, and cosmetics and other personal hygiene products containing corn ingredients ( USGC, 2010 ) . In the 2010/2011 market year, these products totaled 12.2% of domestic field corn consumption ( USDA

- ER S, 2011g ) . In 2010, the average per capita consumption of corn food products was 102.2 pounds, 69.2 pounds of which was corn sweeteners ( USCB, 2011 ) . The major use of corn indirectly consumed by humans is in the form of livestock feed; in the 2010/11 market year

, approximately 42.8% of domestic corn consumption w as for feed and residual use ( USDA

- ERS, 2011g )

. Also in the 2010/11 market year, the U.S. produced about 12.4 billion bushels (315 million metric tons) of corn

, 88% of which (10.9 billion bushels or 277 million metric tons ) were GE varieties and 72% (8.9 billion bushels or 226 million metric tons ) that was genetically engineered for herbicide resistance ( USDA

- ERS, 2011a ; USDA

- ERS, 2011g ) . Starch and oil fractions obtain ed from wet or dry milling processes produce products such as corn syrup and corn oil for direct human consumption ( CERA, 2010 )

. Some of the commonly raised human health concerns associated with GE crops include the
p otential to xicity of the introduced genes and their products

, t he expression of new antigenic proteins

, or altered levels of existing allergens ( Malarkey, 2003 ; Dona and Arvanitoyannis, 2009 ) . All forms of genetic modification, including natural and human

- mediated , have the potential for unexpected and unintentional compositional changes ( NRC, 2004 ) . The potential for compositional changes to impact human health is dependent on the nature of the altered substances and biological effects of the compounds. Previous studies of the EPSPS protein, which confers glyphosate resistance, found that the EPSP S proteins expressed through genetic engineering pose no potential for toxicity or allergenicity ( Harrison et al., 1996 ; Ridley et al., 2002 ; Batista et al., 2005 ; Hoff et al., 2007 ; Herouet

- Guicheney et al., 2009 ) . For example, in a study to evaluate the safety of the 2mEPSPS 7 protein in c orn, Herouet

- Guicheney et al. ( 2009 ) found that the 2mEPSPS protein is highly similar, both structurally and functionally, to the wild

type 8 EPSPS protein found in nature, and does not have an amino acid sequence similar to any known allergenic or toxic protein. Similarly, in a stud y of the allergenicity of the CP4 EPSPS 9 protein in GE corn and soybean to potentially sensitive humans, Batista et al. ( 2005 ) foun d that none of the individuals tested reacted differently to either the transgenic or wild

- type maize samples.

7 The 2mEPSPS protein differs from the wild

- type corn EPSPS protein as a result of the substitution of two amino acids in the genetic sequence.
8 The natural state, or non

- mutated gene that encodes the normal genetic function.
9 The CP4 EPSPS protein is derived from the Agrobacterium sp. strain CP4

.44 An additional concern with GE food crops is the potential for i nc reased levels of anti

- nutrients, the compounds that interfere with the digestio n of proteins, fats, and carbohydrates or the absorption of essential elements in the digestive tract ( Dona and Arvanitoyannis, 2009 ) . There are several naturally occurring anti

- nutrients found in corn, including phytic acid, DIMBOA 10

, raffinose, and low levels of trypsin and chymotrypsin inhibito rs ( OECD, 2002 ) . In a comparison of the nutritional profile of the glyphosate

- resistant corn variety NK603, which expresses the CP4 EPSPS protein for glyphosate resistance, and non

- GE corn, Ridley et al. ( 2002 ) found that the genetic modification to confer glyphosa te resistance did not significantly change any of the 51 biologically and nutritionally important components evaluated.

Under the FFDCA, it is the responsibility of food and feed manufacturers to ensure that the products they market are safe and properly labeled. Food and feed derived from GE corn must be in compliance with all applicable legal and regulatory requirements. GE organisms for food and feed may undergo a voluntary consultation process with the FDA prior to release onto the market. Although a voluntary process, thus far all applicants who wish to commercialize a GE variety that will be included in the food supply have completed a consultation with the FDA. In a consultation, a developer who intends to commercialize a bioengineered food meet s with the agency to identify and discuss relevant safety, nutritional, or other regulatory issues regarding the bioengineered food and then submits to FDA a summary of its scientific and regulatory assessment of the food. The FDA evaluates the submission and responds to the developer by letter ( US

- FDA, 2012b )

. Stine has provided the FDA with information on the identity, function, and characterization of the genes for Maize Line HCEM485, including the expression of gene products. A biotechnology consultation of the EPSPS protein was completed by the FDA on the GA21 corn variety ( Biotechnology Notification File ( BNF ) No. 000051) on February 10, 1998 ( US

- FDA, 1998a )

. According to the consultation note,

“ Monsanto has conclud ed that corn containing transformation event GA21 is not materially different in composition, nutrition, and safety from corn currently grown, processed, marketed, and consumed for animal feed or human food. At this time, based on Monsant o's description of its data and analyses, the Agency considers Monsanto's consultation on corn from varieties containing transformation event GA21 to be complete. ”

Stine submitted a safety and nutritional assessment of food and feed derived from Maize Line HCEM485 to the FD A in December 2010 in support of the consultation process with the FDA for the commercial distribution of Maize Line HCEM485 ( Stine, 2011 )

. The allergy potential of a GE fo od crop is also part of the safety evaluation conducted by FDA. Food allergies are caused by parts of the food or ingredients, usually proteins, which are recognized by the body’s immune cells causing a reaction. There have been reported cases of corn al lergies; however, the protein(s) that may be responsible has not been identified ( CERA,

10 2,4

- Dihydroxy

- 7

- methoxy

- 2H

- 1,4

- benzoxazin

- 3(4H)

- one (DIMBOA) belongs to a group of metabolites, hydroxamic acids and benzoxazinoids that are frequently found in cereal crops.45 2010 ) . Some foods only cause an allergic reaction when eaten raw, while others such as corn

m ay or may not be allergenic, depending on how th ey are processed (i.e. corn oil versus corn grain) ( NIAID, 2011 ) . The Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA) identified the eig ht most

- common allergenic foods which account for 90% of food allergic reactions; however, corn is not included on this list ( US

- FDA, 2012a ) . The EPSPS protein expressed in Maize Line HC EM485 has the same molecular weight and immunochemical

cross

- reactivity as that of GA21 corn ( Stine, 2011 ) , and was determined:

• not to be a known allergen;

• not to have a gene sequence homology (similarity in structure) to known allergens or toxins;

• to have a gene sequence homology 99.3% the same as the wild

- type corn enzyme and other EPSPS proteins found in food crops;

• to be rapidly degraded in the gut; and

• dietar y exposure to the protein is very low ( US

- FDA, 1998a ; CERA, 2010 )

. Corn allergies are, therefore, not very common, but because corn starch, syrup, and oil are used in so many products not readily identifiable as potentially containing corn, those with corn food allergies must carefully read all food labels ( More, 211 )

. In 2010, pesticides were applied to 98% of planted corn acres, and of that, approximately 66% of all active ingredients applied were herbicides ( USDA

- NASS, 2011c ) . Insecticides and fungicides made up approximately 8% and 12% of active ingredients, respectively. The herbicides most widely used on corn in 2010 in order of prevalence were glyphosate applied to 66% of treated acres, followed by atrazine (61%) and acetochlor (25%) ( USDA

- NASS, 2011c )

.
Under the FIFRA, all pesticides (which is inclusive of herbicides , insecticides and fungicides ) sold or distributed in the U.S. must be registered by the EPA ( US

- EPA, 2011a ) . Registration decisions are based on scientific studies that assess the chemical’s potential toxicity and environmental impact. To be registered, a pesticide must be able to be used without posing unreasonable risks to people or the environment. All pesticides registered prior to November 1, 1984, such as glyphosate, must also be reregistered to ensure that they meet the current, more stringent standards and have a reregistration review every 15 years ( US

- EPA, 2011a )

. Glyphosate was first registered in the U.S. in 1974; the latest reregistration decision for glyphosate was issued i n 1993 ( US

- EPA, 1993b ; US

- EPA, 2009b ; US

- EPA, 2009a ) . It is currently under reregistration review, which began in July 2009 and is scheduled for completion in 2015 ( US

- EPA, 2009a )

.

Pursuant to the FFDCA, before a pestic ide can be used on a food crop the EPA must establish the tolerance value, which is the maximum amount of pesticide residue that can remain on the crop or in foods processed from that crop ( US

- EPA, 2011j ) . The USDA has implemented the Pe sticide Data Program (PDP) in order to collect data on pesticides residues on food ( USDA

AMS, 2010 ) . The EPA uses PDP data to prepare pesticide dietary exposure assessments pursuant to the 1996 Food Quality Protection Act . Pesticide tolerance levels for glyphosate have been established for a wide variety of commodities, including field corn for grain and forage, and are published in the Federal Register , 40 CFR §180.364, and the Indexes to Part 180 Tolerance46 Information for Pesticide Chemicals in Food and Feed Commodities ( US

- EPA, 2011e )

. Glyphosate tolerance for corn grain is 5.0 parts per million (ppm) ( 40 CFR §180.364 )

. Glyphosate is registered under a variety of trade names (e.g., Roundup®, Roundup Ultra®, Glyphomax Plus®, and Abund it Extra®) by several companies. There are currently over 400 active glyphosate products registered under FIFRA Section 3, and over 100 registered for use on terrestrial food crops ( US

- EPA, 2009b )

. As mentioned above, it was the most widely

- used herbicide on corn in 2010 , applied to 66% of herbicide

- treated acres in the U.S. ( USDA

- NASS, 2011c ) . In that year, the average application rate was approximately 1.07 lb/A c , with a total of over 57.5 million pounds applied ( USDA

- NASS, 2011c ) . When corn treated with glyphosate may be harvested for food varies by particular formulation. Glyphosate is c lassified as Toxicity Category III or IV 11 , having been found to have low toxicity via the oral, dermal, and inhalation
routes ( US

- EPA, 2009c ) . Similarly, glyphosate is not classified as a carcinogen or teratogen ( US

- EPA, 2009c ) While neurotoxicity has not been observed in previous studies, new data requirements es tablished under 40 CFR part 158 require acute and subchronic neurotoxicity studies, and an immunotoxicity study to take place for reregistration. The next RED for glyphosate is scheduled to be complete in 2015 ( US

- EPA, 2009a ) . Based on toxicological considerations, the EPA Health Effects Division (HED) determined that the main metabolite of glyphosate, AMPA, did not need regulation despite levels observed in foods or feed ( US

- EPA, 2009c )

. The EPA published the Worker Protection Standard (WPS) pursuant to 40 CFR part 170 in 1992 for the purpose of reducing the risk of pesticide poisonings and injuries among agricultural workers and pe sticide handlers ( US

- EPA, 2011k ) . The WPS offers protections to about 2.5 million agricultural workers who work with pesticides at more than 600,000 agricultural workplaces (e.g., farms, forests, nurseries, greenhouses). The WPS contains requirement s for pesticide safety training, notification of pesticide applications, use of personal protective equipment (PPE), restricted entry intervals following pesticide application, decontamination supplies, and emergency medical assistance.

Growers are require d to use pesticides consistent with the application instructions provided on the EPA

- approved pesticide labels. For example, pesticide labels specify the appropriate worker safety practices that must be followed, including the necessary PPE to be worn by mixers, loaders, other applicators and handlers. These label restrictions carry the weight of law and are enforced by the EPA and the states (FIFRA 7 U

. S

. C

. 136j (a)(2)(G) Unlawful Acts); therefore, it is expected that glyphosate use on Maize Line HCEM485 would be consistent with the EPA

approved labels.

2.5 Animal Feed U.S. animal agric ulture consumed approximately 44 % of U.S. corn usage and approximately 127 mi llion metric tons of corn in 2010 ( USDA

- ERS, 2011g ; USDA

- ERS, 2011d ) . As with human consumption of corn, the majority of corn used for animal feed in the U.S. is herbicide resistant ( USDA

- ERS, 2011a ) . Corn typically accounts for approximately 96% of the total feed grain produced for use in the U.S. ( USDA

- ERS, 2011d ) . According to the National Corn Growers Association, beef cattle consume the largest volume of U.S. corn feed, followed by poultry,

11 Category I indicates the highest degree of acute toxicity and Category IV the lowest.47 swine, and dairy cattle ( NCGA, 2011 )

. Corn is used as livestock feed in the form of forage, silage, feed

- grain, and refined feed products. The amount of corn th at is used for feed is dependent on the number of animals (livestock and poultry) that are fed corn and the supply and price of the crop ( USDA

- ERS, 2011d ) . Also taken into account is the amount of supplemental ingredients added to feed and the supply and price of competing ingredients.

Corn silage is commonly used as livestock feed. In 2010, corn was grown for silage in the U.S. on approximately 5.5 million acres and produced approximately 0.97 million metric tons ( USDA

- NASS, 2011e ) . Corn silage is consumed primarily by beef and dairy cattle ( Staples, 2003 ; Sewell and Wheaton, 2011 ) , swine ( K ephart et al., 2012 ) , sheep, and goats ( Schoenian, 2009 ; OMAFRA, 2011 ) . More than half of all corn feed consists of grain corn. Corn grain is further refined into feed by dry milling, wet milling, and as by

- products from distilleries ( CRA, 2006 ) . Corn refiners produce five major animal feed products in the form of gluten meal, gluten feed, corn germ meal, condensed fermented corn extractives (steepwater), and amino acids ( CRA, No Date ) . Dairy and beef cattle, poultry, swine, sheep, pets, and fish are fed refined corn products that are good sources of protein, fiber, minerals, and vitamins ( CRA, 2006 ) . Amino acids such as lysine, threonine, and tryptophan are produced from corn dextrose, providing nutrient supplements in animal feed; lysine is particularly valued for poultry and swine ( CRA, 2006 ) . Corn may also be grown solely for grazing by cattle, goats, sheep, and swine ( Hoorman et al., 2002 ) . While annuals, such as corn, make excellent pasture crops and have the compositional value to meet many of the nutritional needs of livestock, they are generally more expensive than perennials typically used in pastures ( Hoorman et al., 2002 ; Aasen, 2010 ) . In some states, such as Illinois and Kentucky, grazing corn is recommended as a viable option for extending the grazing season, especially for producers with limited land area ( USDA

- NRCS, 2000 ; Ditsch et al., 2004 ) . Corn varieties recommended for grazing include hybrids recommended for silage ( Aasen, 2010 ) . Glyphosate

- resistant varieties may be used, but herbicide application re strictions apply and are dependent on the type and timing of application ( Bradley et al., 2010 )

. Similar to the regulatory control for direct human consumption of corn under the FFDCA, it is the responsibility of feed manufacturers to ensure that the products they ma rket are safe and properly labeled. Feed derived from GE corn , like all corn, must comply with all applicable legal and regulatory requirements, which in turn protects human health. To help ensure compliance, GE organisms used for feed may undergo a volu ntary consultation process with the FDA before release onto the market, which provides the applicant with any needed direction regarding the need for additional data or analysis, and allows for interagency discussions regarding possible issues.

Although a voluntary process, thus far all applicants who wish to commercialize a GE variety that will be included in the food supply have completed a consultation with the FDA. In a consultation, a developer who intends to commercialize a bioengineered food meet s with the agency to identify and discuss relevant safety, nutritional, or other regulatory issues regarding the bioengineered food and then submits to FDA a summary of its scientific and regulatory assessment of the food ( US

- FDA, 2012b )

. The FDA evaluates the submission and responds to the developer by letter. Stine submitted their final food consultation regarding Maize Line HCEM485 in December 2010 and is pending review by the FDA

. It will be posted on the FDA website Final Biotechnology C onsultation s http://www.fda.gov/Food/Biotechnology48 /Submissions/ucm225108.htm when completed. A biotechnology consultation of the EPSPS protein was completed by the FDA on the GA21 corn variety (BNF No. 000051) on February 10, 1998 ( US

- FDA, 1998a ) . No food safety issues were found by the FDA in their review of Monsanto’s safety and nutritional assessment of GA21 corn and the modified EP SPS protein.

As described in Subsection 2.4, Human Health, under FIFRA, all pesticides (including herbicides) sold or distributed in the U.S. must be registered by the EPA ( US

- EPA, 2011a ) . All pesticides registered prior to November 1, 1984, such as glyphosate, must also be reregistered to ensure that they meet the current, more stringent standards and should have a reregistration review every 15 years ( US

- EPA, 2011a ) . The latest reregistration decision for glyphosate was issued in 1993 and the reregistration review was started in July 2009 ( US

- EPA, 2009b ; US

- EPA, 2009a ) . Before a pesticide can be used on a food or feed crop, the EPA must establish the tolerance value, which is the maximum amount of pesticide residue that can remain on the crop or in foods or feed processed from that crop ( US

- EPA, 2011j ; US

- EPA, 2011e ) . Pesticide toleranc e levels for glyphosate have been established for corn and are published in the Federal Register, CFR

, and the Indexes to Part 180 Tolerance Information for Pesticide Chemicals in Food and Feed Commodities ( US

- EPA, 2011e ) . The glyph osate tolerance level established for field corn intended for forage is 6.0 ppm and for grain corn is 5.0 ppm (40 CFR §180.364).

2.6 Socioeconomic

2.6.1 Domestic Economic Environment

The value of U.S. corn production exceeded $66.7 billion in 2010 ( USDA

- NASS, 2011f ) which was 41.7% of the total value of field crops (Figure 6). Corn is among the most important field crops in the U.S. and has been increasing in importance over the past decade (Figure 7). Thirteen states (Iowa, Illinois, Nebraska, Minnesota, Indiana, Kansas, Ohio, South Dakota, Wisconsin, Missouri, Michigan, Texas, and North Dakota) that produced at least one billion dollars’ worth of corn in 2010 also accounted for more than 90% of U.S. production ( USDA

NASS, 2011f ) . These states are widely distributed across resource regions defined by the ERS as the Heartland (Illinois, Indiana, Iowa, Minnesota, Missouri, Nebraska, Ohio, and South Dakota), Northern Crescent (Michigan, Minnesota, Ohio, and Wisconsin), Northern Great Plains (Minnesota, Nebraska, North Dakota, and South Dakota), Prairie Gateway (Kansas, Nebraska, and Texas), Eastern Uplands (Missouri and Ohio), Fruitful Rim (Texas), and Southern Seaboard (Texas) resource regions ( Fernandez

- Cornejo and McBride, 2002 )

. These regions vary in terms of land productivity and cost of production (Figure 8). The most productive of these regions are the Heartland and Northern Crescent. The two most profitable regions, the Heartland and Northern Great Plains, are most profitable for different reasons. T he Heartland benefits from greater productivity, while the Northern Great Plains benefits from lower production costs.49 Source: ( USDA

- NASS, 2011f ) Figure 6

. Percentage d istribution of 2010 U.S. crop value among corn, soybean, hay, wheat , and other crops

. Corn is among the most important field crops in the U.S. as its value of production was 41.7% of the total value of field crops in 2010

.

Source: ( USDA

- NASS, 2004 ; USDA

- NASS, 2005 ; USDA

- NASS, 2006 ; USDA

- NASS, 2007b ; USDA

- NASS, 2008b ; USDA

- NASS, 2009b ; USDA

- NASS, 2010b ; USDA

NASS, 2011f ) 20 25 30 35 40 45Percent of Field Crop Value

Year50 Figure 7

. Value of U.S. corn crop as a percent of all U.S. field crops from 2001 to 2010. Note the value of corn has increased since 2001, indicating its growing impo rtance in U.S. agriculture

.

Source : ( USDA

- ERS, 2011c ) Figure 8

. U.S. corn per acre cost and value of production estimates in major ARMS

corn - producing regions and the entire U.S. in 2010. Values pr esented exclude government payments. States comprising the regions include: Heartland (Illinois, Indiana, Iowa, Minnesota, Missouri, Nebraska, Ohio, and South Dakota), Northern Crescent (Michigan, Minnesota, Ohio, and Wisconsin), Northern Great Plains (Mi nnesota, Nebraska, North Dakota, and South Dakota), Prairie Gateway (Kansas, Nebraska, and Texas), Eastern Uplands (Missouri and Ohio), Fruitful Rim (Texas), and Southern Seaboard (Texas) resource regions ( Fernandez

- Cornejo and McBride, 2002 ) . These regions vary in terms of land productivity and cost of production.

Production cost data are provided by the ERS and collected in surveys conducted every four to eight ye ars for each commodity as part of the annual ARMS ( USDA

- ERS, 2011b ) . In 2010, typical corn production operating costs were reported in dollars per planted acre, and included primarily purchased seed ($ 83.22 )

, fertilizer and soil amendments ($ 101.03 )

, other chemicals ($ 26.86 )

, and irrigation water ($0.1 5 ) ( USDA

- ERS, 2011c )

. In 2010, total

- operating costs for U.S. corn production were $275.58 per planted acre ( USDA

- ERS, 2011c )

. Almost all of the U.S. corn supply (9 9.8% in 2010/11) comes from new annual domestic production ( USDA

- ERS, 2011g ) . Over the past decade this production has increased 25.5% $0.00 $100.00 $200.00 $300.00 $400.00 $500.00 $600.00 $700.00 $800.00

U.S. Heartland Northern Cresent Northern Great Plains Prairie Gateway Eastern Uplands Southern SeaboardPer Acre

ARMS Resource Region Cost

Value51 from 2001 to 2010. In 2010/11, 86.2% of this supply was consumed domestically. Consumption patterns have changed substantially over the past decade. In t h e 2000/01 marketing year, approximately 75% of the domestic use was for animal feed, whereas only about 8.1% was used for ethanol production. In the 2010/11 marketing year, less than half (42.8%) of domestic usage was for feed, while approximately 44.7% of domestic use was for the production o f ethanol, which has been supported by government policies designed to promote domestic renewable energy sources. Similarly, the percentage of corn used for food products (e.g., corn syrup, starch, alcohol for beverages, cereals and other products) decrea sed between the 2000/01 and 2010/11 marketing years from 19.3% to 12.2% ( USDA

- ERS, 2011g ) . Corn use for seed over this period has remained steady at approximately 0.2% ( USDA

- ERS, 2011g )

.

The first commercial herbicide

- resistant variety of corn was released in 1996 that had conferred resistance to glufosinate, followed in 1998 by glyphosate

- resistant corn ( Green and Owen, 2011 )

. Herbicide

- resistant corn varieties have been more slowly adopted than other such crops, but now account for 72% of U.S. corn acreage in 2011 ( Brookes and Barfoot, 2010 ; USDA

- ERS, 2011a )

. As discussed in Subsection 2.1.1, Acreage and Area of Corn Production, herbicide

- resistant corn adoption has varied regionally in the U.S., with South Dakota leading the planting of herbicide

resistant

- only and herbicide

- resistant stacked GE varieties since 2000 , and Ohio planting the least ( USDA

- ERS, 2011a ) (see Subsection 2.1.1, Acreage and Area of Production, Figure 4) . In 2005, 31% of U.S. corn was glyphosate

- resistant and 4% was glufosinate

- resistant ( Sankula, 2 006 )

.

Estimates of the benefits of herbicide

- resistant corn to farmers are limited ( NRC, 2010 )

. For specialized corn farmers, each time farmers increase herbicide

- resistant corn production 10%, Fernandez

- Cornejo and McBride ( 2002 ) found a 2.7% increase in whole farm net returns, while McBride and El

- Osta ( 2002 ) found a 2.7% increase in crop operating margin. McBride and El

Osta ( 2002 ) did not find higher crop operating margins for herbicide

- resista n t corn farmers in general, which includes those that rotate corn with other crops. In an examination of research into U.S. farm

- level economic impacts of GE cr ops, the National Research Council (NRC) ( 2010 ) found studies indicate in the early years of the adoption, GE cultivars exerted downward pressure on crop prices while the earnings of adopting farmers increased, and barriers to access of GE crops reduced grower income. Now that the adoption of GE culti vars is more widespread globally, the NRC recommends further assessment of the farm

- level economic impacts of GE
crops ( NRC, 2010 )

.
Costs of Herbicide

- resistant Weeds An important concern currently facing U.S. farmers, including corn farmers, is the emergence of glyphosate

- resistant weeds ( Johnson and Gibson, 2006 ; Foresman and Glasgow, 2008 ; Hurley et al., 2009a ; Johnson et al., 2009 )

, a result of the repeated, wide spread, and sometimes exclusive

us e of glyphosate on corn, cotton, and soybean crops resistant to the pesticide ( Beckie, 2006 ; Duke and Powles, 2009 ) . As of the 2010 growing season, there were 13 different weed species with glyphosate

- resistant populations ranging across 25 different U.S. states ( Heap, 2011 ) ( s ee Subsection 2.3.2, Plants Communities, Table 2) . Glyphosate

- resistant weed populations have been found in all but 3 (South Dakota, Wisconsin, and Texas) of the 13 major corn producing
states. Comparing the typical glyphosate

- resistant weed management programs to a typical

non herbicide

- resista nt weed management program, Sankula and Blumenthal ( 2004 ) and Sankula52 ( 2006 ) estimated that farmers saved $9.49 to $10.15 per acre in weed management costs. Based on 2007 survey data, Hurley, Mitchell, and Frisvold ( 2009b ) found that farmers planting more glyphosate

- resistant corn reported lower weed management costs

.

Surv eys indicate that farmers prefer to address glyphosate

- resistant weeds by using additional herbicides with different modes of action ( Johnson and Gibson, 2006 ; Foresman and Glasgow, 2008 ; Johnson et al., 2009 ) . Weirich et al. ( 2011 ) investigated the effect of grower adoption of alternative glyphosate weed resistance management programs
, finding they increased cost

s ubstantially , though they did not statistically significantly decrease net returns due to highe r yields. These results suggest that growers may be able to effectively respond to glyphosate resistance using weed BMPs without substantially affecting their returns.

Organic Crop Production Organic crop production represents an extremely small share of U.S. production. In 2008, there

were approximately 2.2 to 2.6 million acres of certified organic cropland representing about 0. 7 0 % of the total cropland acres ( USDA

- ERS , 2010a ; USDA

- NASS, 2010a ) . There were only 194,637 acres of organic corn representing 0.05% of total cropland and 0.21% of the total corn acres in 2008 ( USDA

- ERS, 2010a ) . More than 80% of this production was concentrated in 10 states (Wisconsin, Minnesota, Iowa, Michigan, New York, Texas, Nebraska, Ohio, Illinois, and Pennsylvania), with the top 2 states (Wisconsin and Minnesota) representing almost a third of these acre s ( USDA

- ERS, 2010b ) . All but New York and Pennsylvania are among the top 13 corn producing states. The value of corn produced for grain or seed from organic

- certified farms in the U.S. in 2008 was nearly $111.4 million ( USDA

- NASS, 2010a )

.

2.6.2 Trade Economic Environment

The Cartagena Protocol on Biosafety is a treaty under the United Nations Convention on Biological Diversity (CBD) that established a framework for the safe transboundary movement, with respect to the environment and biodiversi ty, of Living Modified Organisms (LMO s ), including those modified through biotechnology. See Subsection 7.1.2, International Implications, for a more extensive discussion of the Cartagena Protocol . Although the U.S. is not a party to the CBD, Parties to the Protocol have developed regulations to comply with it which U.S. exporters must adhere.
Agricultural exports represented $137.4 billion or 10% of the total value of U.S. exports in the 2011 fis cal year ( USDA

- ERS, 2010d )

. Approximately 15% of U.S. corn production is destined for export ( USDA

- ERS, 2009 )

. Corn exports worth $9.1 billion ranked second onl y to bulk soybean exports

, and accounted for 8.4% of all U.S. agricultural exports ( USDA

- ERS, 2010c )

. In the 2010/11 marketing year (extending from September to August) , the U.S. accounted for more than half of all global corn exports (46.0 million metric tons), while Argentina and Brazil accounted for another 25%, exporting 15.0 and 11.0 million metric tons, respectively ( USDA

FAS, 2011a ) . Over the past decade, U.S. corn exports have remained relatively stable, while global exports have increased by almost 20%, eroding the U.S. export share (Figure 9 ). This is attributed to greater domestic use of U.S. corn, smaller corn crops, and inc reased competition from other major corn exporters such as Argentina, Brazil

, and Ukraine ( USDA

- FAS, 2011a )

. U.S. exports tend to increase when there is a large domestic supply, prices are competitive, and53 foreign demand increases ( USDA

- ERS, 2009 ) , illustrated by record exports in 2007/2008 (Figure 9 ).

Source : ( USDA

- FAS, 2004 ; USDA

- FAS, 2005 ; USDA

- FAS, 2006 ; USDA

- FAS, 2007 ; USDA

FAS, 2008a ; USDA

- FAS, 2009 ; USDA

- FAS, 2010a ; USDA

- FAS, 2011a ) Figure 9

. U.S. and world corn exports in million metric tons for marketing years 2000/01 to 2010/11. Market years extend from September to August. The rest of the world major exporters include Argentina, Brazil, Canada, China, EU

- 27, India, Para g uay, Romania, Serbia, South Africa, Thailand, Ukraine, and Zambia as well as other smaller exporting countries. Note that U.S. percentage of corn exports in relation to overall world exports declined at the end of the last decade.

Table 4 includes the quantities of U.S.

- produced corn imported by the 10 largest importing countries spanning 2010 and 2011. Japan, Mexico, and South Korea were the top three impor ters of U.S. corn for those periods ( USDA

- ERS, 2011h ) , consuming approximately 31%, 17%, and 13% of total U.S. corn exports , respectively

. Where U.S. corn will be exported is subject to global market conditions shaped by many factors such as the value of the U.S. dollar and other currencies, oil prices, U.S. and international agricultural policy, the U.S. and international biofuels sector, livestock and meat trade, prices, and population growth ( USDA

ERS, 2009 ; USDA

- OCE, 2011 ) . In the case of GE crops and derived food and feed, consumer perception of GE products can create trade barriers ( Fernandez

- Cornejo and Caswell, 2006 )

. The primary U.S. corn export destinations are also the largest world importers of corn and do not seem to have major barriers for importing GE products. For example, as of 2006, Jap an has approved 75 biotech modifications for food, 59 for feed and 55 for planting ( Hamamoto, 2006 )

. C ommercialization of domestic and imported biotech plant products requires envi ronmental, food and feed approvals in Japan, and strict labeling on all biotech food products is required. In addition to national regulations, there are also local requirements in some areas of Japan ( Hamamoto, 2006 )

. Mexico imports and consumes existing varieties of GE corn and has passed 0 20 40 60 80 100 120Million Metric Tons

Marketing Year (Sept.

- Aug.) Rest of World United States54 legislation that would enable experimental releases of GE corn crops, and, potentially, commercial production ( USDA

- FAS, 2008b ; USDA

- FAS, 2010b ) . South Korea has adopted the Ca r t a gena Protocols on Biosafety , thus has processes requiring environmental, food and feed safety approvals for imported GE crops for cultivation, food

, and feed, but has not produced

Table 4

. L argest importers of U.S. corn in the 2010/11 Season

.

Location October 2009

- August 2010 October 2009

- August 2011 August 2010 August 2011

(Million Metric Tons) Japan 13.76 13.16 1.32 0.85 Mexico 7.63 6.86 0.62 0.67 South Korea 6.20 5.54 0.74 0.57 Taiwan 2.88 2.65 0.32 0.11 Egypt 2.30 2.74 0.28 0.44 Canada 1.81 0.80 0.11 0.16 China 1.20 0.67 0.49 0.18 Venezuela 1.05 0.79 0.15 0.16 Dominican Republic 0.88 0.68 0.06 0.03 Colombia 0.85 0.48 0.03 0.01 World Total 45.23 42.11 4.72 3.82 Source: ( USDA

- ERS, 2011h )

biotechnology crops ( USDA

- FAS, 2011b ) ; they have, however, approved field trial s of certain biotech crops. The majority of GE corn imported to South Korea is used for animal feed, which is nearly all GE in that country ( USDA

- FAS, 2011b ) . Processed corn products such as corn
syrup or corn oil are exempt from labeling there because they contain miniscule amounts of biotech protein ( USDA

- FAS, 2011b ) , but other food and animal feed require labeling. Surveys consistently find that consumers around the world have concerns about food derived from GE
crops ( Fernandez

- Cornejo and Caswell, 2006 ) that has led to labeling requirements in many countries, and some retailers are reluctant to stock GE

- labeled food, creating a barrier to trade.

The U.S. produced 316.2 million metric tons of corn in the 2010/11 marketing year, whic h represented 38.6% of world production ( USDA

- FAS, 2011a ) . U.S. corn production has remained relatively stable over the last decade, but the U.S. share of world production has declined even as total w orld production increased by 39.8% (Figure 10). The other major producers of corn are China and Brazil, producing respectively 21.0% (173.0 million metric tons) and 7.0% (57.5 million metric tons) of global production in 2010/11.

The U.S. and China are also the top 2 consumers of corn at 290.3 and 172.0 million metric tons, respectively, in the 2010/11 marketing year, comprising more than half of world consumption (Table 5) ( USDA

- FAS, 2011a ) . The European Union is the next larg est consumer, accounting for 7.4% (62.3 million metric tons) of global consumption. Over the past decade, U.S. corn consumption has increased by 46.5%, primarily due to increased ethanol production, while world corn consumption increased by 38.6% (Figure 11 ) ( USDA

- FAS, 2004 ; USDA

- FAS, 2005 ;55 USDA

- FAS, 2006 ; USDA

- FAS, 2007 ; USDA

- FAS, 2008a ; USDA

- FAS, 2009 ; USDA

- FAS, 2010a ; USDA

- FAS, 2011a )

.

Source: ( USDA

- FAS, 2004 ; USDA

- FAS, 2005 ; USDA

- FAS, 2006 ; USDA

- FAS, 2007 ; USDA

FAS, 2008a ; USDA

- FAS, 2009 ; USDA

- FAS, 2010a ; USDA

- FAS, 2011a ) Figure 10

. U.S. and world corn production in million metric tons for marketing years 2000/01 to 2010/11. Market years extend from September to August. The rest of the world major producing countries include Argentina, Brazil, Canada, China, Egypt, EU

- 27, India, Indonesia, Mexico, Nigeria, Philippines, Roma nia, Serbia, South Africa, Thailand, Turkey, and the Ukraine. Note that U.S. production increased slightly while its percentage of overall world corn production declined in the last decade.

Table 5

. World corn consumption for marke ting years (August to September) 2008/2009 to 2010/2011.

Location 2008/09 2009/10 2010/11 (Million Metric Tons) Brazil 45.5 47.0 49.5 Canada 11.7 11.6 11.3 China 153.0 159.0 172.0 Egypt 11.1 12.0 12.1 EU

- 27 1 61.6 59.5 62.3 India 17.0 15.1 18.3 Japan 16.7 16.3 15.6 Mexico 32.4 30.2 28.5 South Africa 9.9 10.3 10.6 United States 259.3 281.6 290.3 0 100 200 300 400 500 600 700 800 900Million Metric Tons

Marketing Year (Sep.

- Aug.) Rest of World
United States56 Others 165.5 174.1 173.0 World Total 783.7 816.7 843.6
Source ( USDA

- FAS, 2011a )
1 European Union 27 member countries

Source ( USDA

- FAS, 2004 ; USDA

- FAS, 2005 ; USDA

- FAS, 2006 ; USDA

- FAS, 2007 ; USDA

FAS, 2008a ; USDA

- FAS, 2009 ; USDA

- FAS, 2010a ; USDA

- FAS, 2011a ) Figure 11

. U.S. and world corn consumption in million metric tons for marketing years 2000/01 to 2010/11. Marketing years extend from Septembe r to August. The rest of the world major comsumers of corn include Brazil, Canada, China, Egypt, EU

- 27, India, Japan, Mexico, and South Africa. Note both U.S. and world corn consumption has increased over the last decade , although the U.S. percentage of overll world corn consumption has decreased

. 0 100 200 300 400 500 600 700 800 900Million Metric Tons

Marketing Year (Sept.

- Aug.) Rest of World United States57 

### 3 ALTERNATIVES

This document analyzes the potential environmental consequences of APHIS’ response to Stine’s extension request for a determination of nonregulated status to Maize Line HCEM485. To respond favorably to a request for an extension of nonregulated status, APHIS must determine that Maize Line HCEM485 is similar to the antecedent organism, GA21 and is

, therefore

, unlikely to pose a plant pest risk. Based on its PP RA ( U SDA

- APHIS, 2011b ) , APHIS has concluded that Maize Line HCEM485 is similar to GA21 and is unlikely to pose a plant pest risk. Therefore APHIS must determine that Maize Line HCEM485 is no longer subject to 7 CFR part 340 or the plant pest provisions of t he Plant Protection Act.

Two alternatives are evaluated in this EA: (1) no action and (2) extension of a determination of nonregulated status to Maize Line HCEM485. APHIS has assessed the potential for environmental impacts for each alternative in the En vironmental Consequences section.

3.1 No Action Alternative: Continuation as a Regulated Article Under the No Action Alternative, APHIS would deny the extension request

. Maize Line HCEM485 corn and progeny derived from Maize Line HCEM485 corn would continue to be regulated articles under the regulations at 7 CFR part 340. Permits issued or notifications acknowledged by APHIS would still be required for introductions of Maize Line HCEM485 corn and measures to ensure physical and reproductive confinement would continue to be implemented. APHIS might choose this alternative if there were insufficient evidence to demonstrate that Maize Line HCEM485 is similar to the antecedent organism, GA21.

This alternative is not the Preferred Alternative because APHIS has c oncluded through a Plant Pest Risk Assessment that Maize Line HCEM485 corn is similar to the antecedent organism, GA21 and is unlikely to pose a plant pest risk ( USDA

- APHIS, 2011b ) . Choosing this alternative would not satisfy the purpose and need of making a determination of plant pest risk status and responding to the extension request for nonregulated status.

3.2 Preferred Alternative: Approve the Request for an Extension of a Determination of Nonregulated Status to Maize Line HCEM485 from Corn Event GA21

U nder this alternative, Maize Line HCEM485 corn and progeny derived from them would no longer be regulated articles under the regulations at 7 CFR part 340. Maize Line HCEM485 is unlikely to pose a plant pest risk ( USDA

- APHIS, 2011b ) . Permits issued or notifications acknowledged by APHIS would no longer be required for introductions of Maize Line HCEM485 corn and progeny derived from this event. This alternative best meets the purpose and need to respond appropriately to a request f or an extension of a determination of nonregulated status based on the requirements in 7 CFR part 340 and the agency’s authority under the plant pest provisions of the Plant Protection Act. Because the agency has concluded that Maize Line HCEM485 corn is similar to the antecedent organism, GA21 and is unlikely to pose a plant pest risk, a n extension of a determination of nonregulated status to Maize Line HCEM485 corn is a response that is consistent with the plant pest provisions of the Plant Protection Ac t , the regulations codified in 7 CFR part 340, and the biotechnology regulatory policies in the Coordinated Framework.58 Under this alternative, growers may have future access to Maize Line HCEM485 and progeny derived from this event if the developer decides to commercialize Maize Line HCEM485.

3.3 Alternatives Considered But Rejected from Further Consideration APHIS assembled a list of alternatives that might be considered for Maize Line HCEM485. The agency evaluated these alternatives, in light of the agency' s authority under the plant pest provisions of the Plant Protection Act, and the regulations at 7 CFR part 340, with respect to environmental safety, efficacy, and practicality to identify which alternatives would be further considered for Maize Line HCEM4 85. Based on this evaluation, APHIS rejected several alternatives. These alternatives are discussed briefly below along with the specific reasons for rejecting each.

3.3.1 Prohibit Any Maize Line HCEM485 Corn from Being Released In response to public comments that stated a preference that no GE organisms enter the marketplace, APHIS considered prohibiting the release of Maize Line HCEM485 corn, including denying any permits associated with the field testing. APHIS determined that this alternative is not approp riate given that APHIS has concluded that Maize Line HCEM485 is similar to the antecedent organism, GA21 and is unlikely to pose a plant pest risk ( USDA

- APHIS, 2011b )

. In enacting the Plant Protection Act, Congress found that

[D]ecisions affecting imports, exports, and interstate movement of products regulated under [the Plant Protection Act] shall be based on sound science...§402(4).

On March 11, 2011, in a Memorandum for the Heads of Executive Departments and Agencies, the White House Emerging Technologies I nteragency Policy Coordination Committee developed broad principles, consistent with Executive Order (EO) 13563, to guide the development and implementation of policies for oversight of emerging technologies (such as genetic engineering) at the agency leve l. In accordance with this memorandum, agencies should adhere to EO 13563 and, consistent with that EO , the following principle, among others, to the extent permitted by law, when regulating emerging technologies:

“[D]ecisions should be based on the best reasonably obtainable scientific, technical, economic, and other information, within the boundaries of the authorities and mandates of each agency”

Based on the PPRA ( USDA

- APHIS, 2011b ) and the scientific data evaluated therein, APHIS concluded that Maize Line HCEM485 is unlikely to pose a plant pest risk. Accordingly, there is no basis in science for prohibiting the release of Maize Line HCEM485.

3.3.2 Isolation Distance between Maize Line HCEM485 and Non

- GE Corn Production and Geographical Restrictions

In res ponse to public concerns of gene movement between GE and non

- GE plants, APHIS considered requiring an isolation distance separating Maize Line HCEM485 from conventional or specialty corn production. However, because APHIS has concluded that Maize Line HCE M485 is unlikely to pose a plant pest risk ( USDA

- APHIS, 2011b ) , an alternative based on59 requiring isolation distances would be inconsistent with the statutory authority under the plant pest provisions of the Plant Protection Act and regulations in 7 CFR part 340.

APHIS also considered geographically restricting the production of Maize Line HCEM485 based on the location of production of non

- GE corn in organic production systems or production systems for GE

- sensitive markets in response to public concerns regarding possible gene movement between GE and non

- GE plants. However, as presented in APHIS’ PPRA for Maize Line HCEM485, there are no geographic differences associated with any identifiable plant pest risks for Maize Line HCEM485 ( USDA

- APHIS, 2011b ) . This alternative was rejected and not analyzed in detail because A PHIS has concluded that Maize Line HCEM485 does not pose a plant pest risk and will not exhibit a greater plant pest risk in any geographically restricted area. Therefore, such an alternative would not be consistent with APHIS’ statutory authority under t he plant pest provisions of the Plant Protection Act and regulations in Part 340 and the biotechnology regulatory policies embodied in the Coordinated Framework.

Based on the foregoing, the imposition of isolation distances or geographic restrictions would not meet APHIS’ purpose and need to respond appropriately to a n ex tension request for nonregulated status based on the requirements in 7 CFR part 340 and the agency’s authority under the plant pest provisions of the Plant Protection Act. However, individ uals might choose on their own to geographically isolate their non

- GE corn production systems from Maize Line HCEM485 or to use isolation distances and other management practices to minimize gene movement between cornfields. Information to assist growers in making informed management decisions for Maize Line HCEM485 is available from AOSCA ( AOSCA, 2010 )

.

3.3.3 Requirement of Testing for Maize Line HCEM485 During the comment periods for other petitions for nonregulated status, some commenters requested USDA to require and provide testing for GE products in non

- GE production systems. APHIS notes there are no nationally

- established regulations involving testi ng, criteria, or limits of GE material in non

- GE systems. Such a requirement would be extremely difficult to implement and maintain. Additionally, because Maize Line HCEM485 does not pose a plant pest risk ( USDA

- APHIS, 2011b ) , the imposition of any type of testing requirements is inconsistent with the plant pest provisions of the Plant Protection Act, the regulations at 7 CFR part 340 and biotechnology regulatory policies embodied in the Coordinated Framework. Therefore, imposing such a requirement for Mai ze Line HCEM485 would not meet APHIS’ purpose and need to respond appropriately to the request in accordance with its regulatory authorities.

3.4 Comparison of Alternatives

Table 6 presents a summary of the potential impacts associated with selection of eith er of the alternatives evaluated in this EA. The impact asses sment is presented in Section 4, Environmental Consequences of this EA.60 Table 6

. Summary of issues of potential impacts and consequences of alternatives.

Attribute/Measure Alternative A: No Action Alternative B: Extend a Determination of Nonregulated Status Meets Purpose and Need and Objectives No Yes
Unlikely to pose a plant pest risk Satisfied through use of regulated field trials Satisfied

– risk assessment ( USDA

- APHIS, 2011b )
Management Practices

Acreage and Areas of Corn Production Unchanged Unchanged

Agronomic Practices Unchanged Unchanged

Pesticide Use Unchanged Unchanged

Corn Seed Production Unchanged Unchanged Organic Corn Production Unchanged Unchanged
Environment

Land Use Unchanged Unchanged

Water Resources Unchanged Unchanged

Soil Quality Unchanged Unchanged

Air Quality Unchanged Unchanged

Climate Change Unchanged Unchanged

Animal Communities Unchanged Unchanged61 Table 6

. Summary of issues of potential impacts and con sequences of alternatives (continued ).

Attribute/Measure Alternative A: No Action Alternative B: Extend a Determination of Nonregulated Status

Plant Communities Unchanged Unchanged

Gene Movement Unchanged Unchanged

Soil Microorganisms Unchanged Unchanged

Biological Diversity Unchanged Unchanged

Human and Animal Health

Risk to Human Health Unchanged Unchanged

Risk to Animal Feed Unchanged Unchanged

Socioeconomic

Domestic Economic Environment Unchanged Unchanged

Trade Economic Environment Unchanged Unchanged

Other Regulatory Approvals

U.S. Unchanged for existing nonregulated GE organisms FDA consultation pending

Other countries Unchanged Canada Compliance with Other Laws

CWA, CAA, Eos Fully compliant Fully compliant62 

### 4 ENVIRONMENTAL CONSEQ UENCES

4.1 Scope of Analysis Potential environmental impacts from the No Action Alternative and the Preferred Alternative for Maize Line HCEM485 corn are described in detail throughout this section. An impact would be any change, positive or negative, from the existing (baseline) con ditions of the affected environment (described for each resource area in Section 2.0 , Affected Environment ). Impacts may be categorized as direct, indirect, or cumulative. A direct impact is an effect that results solely from a proposed action without in termediate steps or processes. Examples include soil disturbance, air emissions, and water use. An indirect impact may be an effect that is related to but removed from a proposed action by an intermediate step or process. Examples include surface water quality changes resulting from soil erosion due to increased tillage, and worker safety impacts resulting from an increase in herbicide use.

A cumulative effects analysis is also included for each environmental issue. A cumulative impact may be an effec t on the environment which results from the incremental impact of the proposed action when added to other past, present, and reasonably foreseeable future actions. An e xample include s breeding Maize Line HCEM485 with other non regulated events

. If there

a re no direct or indirect impacts identified for a resource area, then there can be no cumulative impacts. Cumulative impacts are discussed in Section 5.

Where it is not possible to quantify impacts, APHIS provides a qualitative assessment of potential imp acts. Certain aspects of this product and its cultivation may be no different between the alternatives; those are described below.

APHIS considered the potential for Maize Line HCEM485 to extend the range of corn production and affect the conversion of l and to agricultural purposes. Stine’s studies demonstrate Maize Line HCEM485 is similar in its growth habit, agronomic properties, disease susceptibility, and composition to its antecedent GA21, its control group cultivars, other nonregulated varieties of glyphosate

- resistant corn, and other GE and non

- GE corn ( Stine, 2011 ; USDA

- APHIS, 2011b ) . As such, its cultural requirements would be no different than those of other corn or provided by the areas in which corn is currently cultivated. As presented in Subsection 2.1.1, Acreage and Area of Corn Production, the majority of corn cultivated in the U.S. is herbicide

- resistant, most of which is glyphosate

resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) . Nonregulated Maize Line HCEM485 could replace other commercially available glyphosate

- resistant corn varieties without requiring cultivation of new, natural lands. As such, land use changes associated with ext ending a determination of nonregulated status to Maize Line HCEM485 are not expected to be any different than those associated with the cultivation of other corn cultivars. Accordingly, a lthough the preferred alternative would allow for new plantings of Maize Line HCEM485 to occur anywhere in the U.S., APHIS will focus the environmental analysis to those areas that currently support corn production. To determine areas of corn production, APHIS consulted the NASS Census of Agriculture crop statistics to i dentify corn producing states in the U.S.; all states except Alaska produce corn ( US DA

- NASS, 2009a )

. Additionally, winter nurseries for maize seed are found in the territory of Puerto Rico.63 The environmental consequences of the different alternatives described above will be analyzed under the assumption that farmers, who produce conv entional corn, Maize Line HCEM485 , or produc e corn using organic methods, are using reasonable, commonly accepted BMPs for their chosen system and varieties during agricultural corn production. However, APHIS recognizes that not all farmers follow these B MPs for corn

. Thu s, the analyses of potential environmental affects will also include the assumption that some farmers do not follow these BMP s. Stine has indicated there is no need to change the use pattern of glyphosate for the glyphosate

- resistant Maize Line HCEM485 variety; hence

, APHIS will use current gl yphosate labels as the basis for its potential effects analysis.

4.2 Agricultural Production of Corn

4.2.1 Acreage and Area of Corn Production

No Action Alternative: Acreage and Area of Corn Production

Unde r the No Action Alternative

, the total acres used for the production of corn in the U.S. is predicted to remain between 90 and 92 million acres through 2020 ( USDA

- OCE, 2011 ) (see Subsection 2.1.1, Acreage and Area of Corn Production).

Both GE and non

- GE varieties of corn would be produced under this alternative. The adoption of GE hybrids are likely to dominate U.S. corn production because GE hybrids comprised 88% of the planted corn acres in 2011 ( USDA

- ERS, 2011a ) , the bulk of which contain multiple (stacked) traits such as insect resistance (Bt) and herbicide resistance (see Subsection 2.1.1, Acreage and Area of Corn Production, Figure 3,) ( Fernandez

- Cornejo and Caswell, 2006 ; USDA

- ERS, 2011a )

. From 200 7 to 2011, the production of herbicide

- resistant

- only varieties leveled off at about 23%, insect

- resistant

- only varieties declined to 16% of all planted corn, while those varieties with stacked traits (with both insect and herbicide res istance) ha ve continued to increase to 49% of all planted corn acreage in 2011 ( USDA

- ERS, 2011a ) (see Subsection 2.1.1, Acreage and Area of Corn Production, Figure 3).

Preferred Alternative: Acreage and Area of Corn Production An extension of a determination of nonregulated status to Maize Line HCEM485 under the Preferred Alternative would allow the planting and movement of Maize Line HCEM485 without APHIS

- acknowledged notification. Maize Line HCEM485 is the same with regard to its growth habit and agronomic properties, disease susceptibility, and composition as its control cultivars, its antecedent GA21, other nonregulated varieties o f glyphosate

- resistant corn, and other GE and

non

- GE corn ( Stine, 2011 ; USDA

- APHIS, 2011b )

. Because it is similar to varieties that are currently available, Maize Line HCEM485 is expected to replace some of the currently available glyphosate

- resistant varieties. Therefore the Preferred Alternative w ould not change corn production area and acreage when compared to the No Action Alternative.

4.2.2 Agronomic Practices

No Acton Alternative: Agronomic Practices As discussed in Subsection 2.1.2, Agrono mic Practices, the cultivation of corn requires certain agronomic considerations such as soil and moisture regimes, planting schedules and rates, harvesting schedules, rotation strategy, tillage, and agricultural inputs. Planting schedules and64 rates are d etermined by factors such as region al climate , soil conditions, seed germination, anticipated pest problems

, and weather ( Farnham, 2001a ) . Similarly, the determination of the best harvest time is influenced by factors such as the price of corn, potential yield, weather, length of harvest period, and equipment and labor availability and cost ( Bitzer et al., No Date )

. Crop rotations and tillage strategy would be accomplished in order to optimize soil nutrition, fertility and moisture, and control weeds, insects, and pests.

The cultivation of corn requires several agricultural inputs such as irrigation, fertilizer ( e.g., synthetic fertilizers, manures, and composts containing nitrogen, phosphorus

, and potassium), pesticides (e.g., insecticides, herbicides), and fungicides ( Olson and Sander, 1988 ; Hoeft et al., 2000 ; McLeod and Studebaker, 2006 ) . As discussed in Subsection 2.1.2, Agronomic Practices

, these inputs are dependent on such fact ors as the region, climate, soil conditions, and pests present. Grower decisions regarding the type and extent of agricultural inputs needed to produce conventional or organic corn would continue to be based on the ease and flexibility of production syste ms and individual needs that may vary from year to year, responding to variation in weather, weed, insect pest, disease pressures, and targeted production returns ( USDA

- ERS, 1997c )

. Weeds are the most important pest s that interfere with yield and profitability ( Gibson et al., 2005 ; Baucom and Holt, 2009 ) . Practices to reduce the incidence of weeds include tillage, crop rotation, intercropping, the use of ground covers and mulches, flame weeding, and the application of herbicides ( Gunsolus, 2006 ; Hedtke et al., 2006 ; Smith and Scott, 2006 ; CropsReview, 2011 ; USDA

- NASS, 2011c ) . In addition, no

- till practices also reduce weed occurrence by minimizing soil disturbance tha t promotes weed seed germination ( University of California, 2009 )

. Due to the potential damage caused to crops from mechanical weed control and the availability of better herbicide technology, producers have turned more to chemical control in corn production ( Smith an d Scott, 2006 ) . The proportion of herbicide

- resistant corn cultivars in the U.S. has steadily grown since the approval of the request for nonregulated status of the first variety of herbicide

- resistant corn in 1995 ( USDA

- APHIS, 2012 ) . Recent estimates indicate the majority of corn planted in the U.S. is herbicide resistant, comprising 72% of corn planted in 2011 ( USDA

- ERS, 2011a ) , and most herbicide

- resistant corn is glyphosate

- resistant ( Duke and Powles, 2009 )

. T he increased use of glyphosate as a consequ ence of expanded adoption of the glyphosate

- resistant trait in corn production is primarily attributed to the herbicide’s effective and efficient weed control as a non

- selective herbicide ( Owen et al., 2011 ) , its lower cost and simplicity of use, its minimal toxicity to animals and the environment, and its support of conservation tillage practices ( Duke and Powles, 2009 ; NRC, 2010 ; Green and Owen, 2011 )

. Another observed herbicide trend since the adoption of GE corn has been a substantial reduction in the diversity of herbicide s use d in corn production ( Young, 2006 ) . The use of other herbicides has declined significantly

, and it is estimated that 34% of corn acres receive only glyphosate for weed management ( NRC, 2010 ; Owen, 2011 )

. In 2010, over 98% of corn acres i n 19 survey states w ere treated with herbicides, and of that acreage, 66% w ere treated with glyphosate ( USDA

- NASS, 2011c ) . Farmers have recently begun to broaden weed management strategies in response to the development of herbicide

- resistant weeds, addressed in Subsection 2.3.2, Plants Communities.65 Preferred Alternative: Agronomic Practices

The continued u se of herbicides, including glyphosate, would be unaffected by the extension of a determination of nonregulated status to Maize Line HCEM485. Like under the N o A ction A lternative, t he amount of herbicides other than glyphosate applied to corn would likely continue to decline as it has for the last decade ( NRC, 2010 ) . The use rate of glyphosate and other herbicides is not expected to change as a result of extending a determination of nonregulated
status to Maize Line HCEM485, because Maize Line HCEM485 is anticipated to replace other glyphosate

- resistant corn cultivars, and no change in the registered use of glyphosate is proposed. In the longer term, like under the N o A ction A lternative, the use of non

- glyphosate herbicides may increase and more emphasis may be placed on best management agronomic practices to address the issue of glyphosate

- resistant weeds ( Green, 2011 ; Owen, 2011 ; Owen et al., 2011 ) ; (see Subsection 4.4.2, Plants Communities). Glyphosate would likely continue to be a major component of weed management in corn production because of its flexibility in application, its efficacy against a broad sp ectrum of weeds, and its relatively low cost ( Powles, 2008 ; Duke and Powles, 2 009 ; Green and Owen, 2011 ; Owen et al., 2011 ) . No changes in agronomic practices would occur as a consequence of extending a determination of nonregulated
status to Maize Line HCEM485 when compared to the No Action Alternative.

4.2.3 Corn Seed Production

No Acton Alt ernative: Corn Seed Production Commercially available corn seed is produced in those regions of the U.S. where the specific hybrid is best adapted for growth, as well as in winter nurseries in Hawaii, Puerto Rico, Chile, and Argentina (see Subsection 2.1.3 , Corn Seed Production). Corn is a major U.S. crop, and planted acreage in USDA projections is expected to remain at current levels to 2020 ( USDA

OCE, 2011 ) ; t herefore

, seed production is likely to remain at current levels. Because 72% of the

corn acreage is planted in herbicide

- resistant varieties, a comparable amount of the corn seed acreage planted is likely to be of herbicide

- resistant varieties.

Corn seed production adheres to seed certification standards such as land history, field isolation, and varietal purity, as discus sed in Subsection 2.1.3, Corn Seed Production, to ensure the quality of corn seed remains high. Corn producers implement measures to preserve the identity of their seed varieties in accordance with seed certifying standards.

Preferred Alternative: Corn Seed Production Stine’s field trials have not demonstrated any agronomic or phenotypic differences between Maize Line HCEM485 and its control corn cultivars ( Stine, 2011 ; USDA

- APHIS, 2011b )

. As described in Subsection 4.2.1, Acreage and Area of Corn Production, an extension of a determination of nonregulated status to Maize Line HCEM485 would likely replace some of the acreage planted in other commercial ly available glyphosate

- resistant corn cultivars on current production acres because of its similarity to these other cultivars. The extent to which Maize Line HCEM485 is planted for seed is dependent upon how much it is adopted in the market, but it would likely replace acres planted to other glyphosate

- resistant varieties.66 4.2.4 Or ganic Corn Production

No Action Alternative: Organic Corn Production Acreage devoted to organic corn production is small relative to that of GE varieties. M easurable
acreages of organic corn is produced in 39 states , with the largest amount produced in Io wa, Michigan, Minnesota, New York, and Wisconsin , which also produced a combined amount of about 29 million acres of non

- organic conventional and GE corn in 2010 ( USDA

- NASS, 2010a ; USDA

- ERS, 2011a ; USDA

- NASS, 2011b )

. While the amount of organic corn production has steadil y increased between 1995 and 2008, the latest year with available statistics, organic corn production remained at around 0.2% of the total U.S. corn acreage from 2005 through 2008 ( USDA

- ERS, 2010a )

. It is important to note that the current NOP regulations do not specify an acceptable threshold level for the adventitious presence of GE materials in an organic

- labeled product. The unintentional presence of the products of excluded methods will not affect the status of an organic product or operation when the operation has not used excluded methods and has taken reasonable steps to avoid contact with the products of excluded methods as detailed in their approved organic system plan ( Ronald and Fouche, 2006 ; USDA

- AMS, 2008 ) . However, certain markets or contracts may have defined thresholds ( Non

- GMO

- Project, 2010 )

. Under the N o A ction A lternative, 88% of the corn grown in th e U.S. is GE. Growers with contracts that specify defined thresholds for GE materials incorporate production practices to meet their thresholds.

Preferred Alternative: Organic Corn Production As described in Subsection 4.2.1, Acreage and Area of Corn Pro duction, extending a determination of nonregulat ed status to Maize Line HCEM485 is not expected to change the acreage or area of corn production that could potentially impact organic corn production. Because of its similarity to other corn growth and repr oductive habits, the current availability and extent of other nonregulated glyphosate

- resistant corn, and the relative stability of acreage devoted to herbicide

- resistant

- only corn production in the U.S., Maize Line HCEM485 is expected to replace other gly phosate

- resistant corn in the areas that corn is currently produced. Maize Line HCEM485 would not influence the ove rall adoption rate of herbicide

- resistant corn. E xtension of a determination of nonregulated status to Maize Line HCEM485 under the Preferr ed Alternative would not change agronomic production practices used by organic or other corn producers. There are no discernible differences in pollen size and morphology between Maize Line HCEM485 and control corn comparators, and, while Maize Line HCEM4 85 pollen viability was significantly greater than the control, it was within the ranges reported for other corn reference samples ( Stine, 2011 ; USDA

- APHIS, 2011b ) . As such, an organic corn producer may utilize existing separation practices as used for all other commercially available glyphosate

resistant corn varieties to meet National Organic Standards and NOP eligibility.

The production of organic corn would not be expected to change under the Preferred Alternative; hence, the potential impacts of extending a determination of nonregulated status to Maize Line HCEM485 would be similar to the No Action Alternative.67 4.3 Physical Environment

4.3.1 Soil Quality

No Action Alternative: Soil Quality Agronomic practices associated with GE and non

- GE corn crop production that benefit soil quality include contouring, use of cover crops to limit the time soil is exposed to wind and rain and introduce certain soil nutrients, crop rotation, and windbreaks

. O ther agronomic practices utilized in non

- GE and GE c orn production that potentially impact soil quality include tillage for crop establishment, fertilizer, weed control

, and pesticide application.

The production of nonregulated herbicide

- resistant corn utilize s EPA

- registered pesticides for insect and plant pest management, including glyphosate. In 2010, herbicides were applied to 98% of cropland planted to corn ( USDA

- NASS, 2011c )

. Pesticides (including herbicide, insecticide, and fungicide) consist of active ingredients that control pests and inert ingredients to facilitate their application. In 2010, 66% of all active ingredients applied to corn treated with pesticides were herbicid al ( USDA

- NASS, 2011c ) , indicating their widespread use and potential to affect the environment T he amount of herbicides other than glyphosate applied to corn ha s declined over the last decade ( NRC, 2010 ) (see Subsection 4.2.2, Agronomic Pract ices). The environmental risks of pesticide use are assessed by the EPA in the pesticide registration process and are regularly re

- evaluated by the EPA to maintain their registered status under FIFRA. In this process, steps to reduce pesticide residuals and persistence in soil are included on a pesticide’s label and approved by the EPA.

As discussed in Subsection 2.2.1, Soil Quality, there have been several reports of the long

- term use of glyphosate immobilizing manganese and potentially reducing plant uptake or ability to utilize this nutrient ( Eker et al., 2006 ; Neumann et al., 2006 ; Ozturk et al., 2008 ; Cakmak et al., 2009 ; Huber, 2010 ) . Additional investigations are required to determine the scope and characterization of glyphosate interactions with nutrients. The current understanding is
manganese

- glyphosate interaction resulting in manganese problems appears to occur in areas wh ere manganese deficiency already exists ( Hartzler, 2010 ) , and producers should be prepared to address it with agronomic practices designed to augment manganese ( Camberato et al., 2010 )

.

T he development of glyphosate

- resistant weeds or weed management tillage practices potentially impact soil quality. A variety of strategies shoul d be utilized in addressing glyphosate

- resistant weeds, including applying the right strength of herbicide, rotating herbicide modes of action, crop rotation, spot treatments, vigilant scouting, and hand weeding ( Gunsolus, 2002 ; Sellers et al., 2011 )

. In the long term, more diverse weed management tactics potentially including more aggressive tillage practices that can affect soil quality may be needed to address the increasing emergence of glyphosate

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 ) . The particular mix of weed management tactics selected by an individual producer is dependent upon many factors, including the agroecological setting, the problem weed type, and agronomic and socioeconomic factors important to farmers ( Beckie, 2006 )

. Preferred Alternative: Soil Quality Extending a determination of nonregulated status to Maize Line HCEM485 would not affect soil quality. With nonregulated status, Maize Line HCEM485 would likely replace other68 commercially available glyphosate

- resistant corn cultivar s because most corn acreage is currently planted to either glyphosate

- resistant

- only corn or herbicide

- resistant corn varieties stacked with other GE traits ( Duke and Powl es, 2009 ; USDA

- ERS, 2011a )

. The area and acreage of corn production potentially impacting soil quality would not change as a result of the Preferred Alternative.

Maize Line HCEM485 is agronomically and compositionally equivalent to its antecedent GA21, its control cultivars, and other GE and non

- GE corn varieties currently in commercial production ( Stine, 2011 ; USDA

- APHIS, 2011b ) . Agronomic practices such as tillage and the application of agricultural chemicals that could impact soil quality or its community structure and function would not change from those currently used for production of other nonregulated glyphosate

resistant corn varieties.

Sin ce it is expected to replace other glyphosate

- resistant cultivars, the nonregulated status of Maize Line HCEM485 would not affect weed management practices or their effects on soil quality. As discussed above, more diverse weed management tactics potentia lly including more aggressive tillage practices that can affect soil quality may be needed to address the increasing emergence of glyphosate

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 )

. As described under the No Action Alternative discussion, the weed management tactics selected by an individual producer would be dependent upon many factors ( Beckie, 2006 ) . Weed management practices needed for the production of Maize Line HCEM485 woul d be no different than those used in other commercially available glyphosate

- resistant corn cultivars.

Under the Preferred Alternative, the amount of herbicides other than glyphosate applied to corn would likely continue to decline as they have for the la st decade ( NRC, 2010 ) (see Subsection 4.2.2, Agronomic Practices). The application of glyphosate is not expected to change as a result of extending a determination of nonregulated status to Maize Line HCEM485, as no change in the registered use or label of this herbicide is proposed and

, as discussed in Subsection 4.2.1, Acreage and Area of Corn Production, the cultivar is anticipated to replace other glyphosate

resistant corn varieties. As discussed above, the impact of glyphosate on manganese availability for uptake by crops after its application is an issue that may be addressed with common practices utilized to augment deficient soil nutrients. S ince Maize Line HCEM485 is agronomically similar to other GE and non

- GE corn varieties and would most likely replace other glyphosate

resistant varieties, the same methods used to address manganese deficiency in current corn production would also be used with Maize Line HCEM485 ; t herefore, impact s to soil quality under the Preferred Alternative would be the same as the No Action Alternative.

4.3.2 Water Resources

No Action Alternative: Water Resources

As discussed in Subsection 4 .2.1, Acreage and Area of Corn P roduction, corn is expected to continue to be a major crop in the U.S., with a predicted increase in production from approximately 88 million acres of land in 2010 to between 90 and 92 million acres through 2020 ( USDA

- OCE, 2011 ) . Current agronomic practices associated with corn production that have potential to impact wat er quality or quantity include tillage, agricultural inputs such as fertilizer and pesticide use, and irrigation. The majority of herbicide

- resistant corn grown in the U.S. is glyphosate

- resistant ( Duke and Powles, 2009 )

.69 A s discussed above in Subsection 4.3.1, Soil Quality, more diverse weed management tactics potentially including more aggressive tillage practices that can affect soil erosion may be needed to address the increasing emergence of glyphosate

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 )

. Increased tillage could result in more soil erosion that could consequently increase sedimentation and residual pollutant loading of nearby waters . T he particular mix of weed management tactics selected by an individual producer , however, are dependent upon many factors such as the agroecological setting, the problem weed type, and agronomic and socioeconomic factors important to farmers ( Beckie, 2006 )

. As discussed in Subsection 2.2.2, Water Resources, fertilizer and pesticide use has the potential to impact water quality. In 2010, fertilizer (primarily nitrogen) was applied to the majority of corn acres, and herbicides applied to 98% of planted corn ( USDA

- NASS, 2011c ) . Of the treated acres, glyphosate was the most commonly applied herbicide active ingredient that year ( USDA

- NASS, 2011c )

. When used consistent with registered uses and EPA

- approved label s, glyphosate presents minimal risk to surface and groundwater . Irrigation from surface and subsurface sources can reduce water quantity and impact water quality by the used water acquiring increased sediment, nutrients, and chemicals adsorbed to soil tha t is subsequently leached to groundwater, or returned to surface water. Recent estimates indicate only 11.0 to 11.5% of corn acreage is irrigated in the U.S. ( NCGA, 2011 )

.
Preferred Alternative: Water Resources

An extension o f a determination of nonregulated status to Maize Line HCEM485 under the Preferred Alternative would present another glyphosate

- resistant corn and weed management option to farmers. I t is expected Maize Line HCEM485 would replace other glyphosate

- resistant corn varieties and, therefore, not change the overall acreage or area of corn production in the U.S. that potentially impacts water resources through sedimentation and residual pollutant loading from runoff

. As discussed in Subsection 4.2.1, Acreage and Area of Corn Production, herbicide

- resistant corn comprised 72% of all planted corn acreage in 2011 and the majority of herbicide

- resistant corn is glyphosate resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a )

. As Maize Line HCEM485 is similar in its growth and agronomic characteristics to its control cultivars and antecedent GA21, and other nonregulated glyphosate

- resistant maize lines ( USDA

APHIS, 2011b ) , no ch anges to irrigation and other agronomic practices such as fertilizer and pesticide applications, including herbicides, that have the potential to affect water quality or quantity

, would occur as a result of this alternative.

Since Maize Line HCEM4 85 is expected to replace other glyphosate

- resistant corn acreage , its nonregulated status would not affect the recent trend to broaden weed management practices, including more tillage that may increase erosion, and thereby sediment loading to surface wat ers

. The impacts of the Preferred Alternative to water resources, therefore, would be the same as the No Action Alternative.

4.3.3 Air Quality

No Action: Air Quality Corn is the most widely produced feed grain in the U.S., so its production practices can sub stantially impact air quality. Tillage is utilized to prepare the ground for planting, to control weeds, incorporate nutrients and herbicides into soil, and is useful for other functions such as70 controlling water flow through a field (see Subsection 2.1.2 , Agronomic Practices). Tillage exposes soil to wind erosion and utilizes motorized equipment that produces emissions. The use of herbicide

- resistant crops has facilitated the adoption of conservation tillage ( Towery and Werblow, 2010 )

. The USDA reports that in 2010, up to 74.5% of planted corn acres were produced under conservation tillage practices ranging from no

- till to reduced till ( USDA

- ERS, 2011f )

. Reduced tillage generates fewer particulates (dust) and potentially contributes to lower rates of wind erosion releasing soil particulates into the air, benefitting air quality ( Fawcett and Towery, 2002 ) . Conservation tillage also reduces equipment emissions due to decreased usage. More recently, these benefits may be eroding b y employing more aggressive tillage to control the increasing resistance of weeds to herbicides, including glyphosate

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 )

. Weed management methods, however, vary from farm to farm, dependent upon the agroecological setting, the problem weed type, and agronomic and socioeconomic factors important to farmers ( Beckie, 2006 )

. Pesticide application in corn production has the potential to impact air quality while actively applied through spray drift, afterward by volatilization off of plant and soil surfaces, and by windborne soil containing residuals in areas where a pesticide has been dispensed (see Subsection 2.2.3, Air Quality, for detailed discussion). Glyphosate is the most common herbicide active ingredient applied to herbicide

- treated corn in the U.S. ( USDA

- NASS, 2011c )

. The EPA is currently evaluating new regulations for pesticide drift labeling and the identification of BMPs to control such drift ( US

- EPA, 2009d ) , as well as identifying scientific issues surrounding fi eld volatility of conventional pesticides ( US

- EPA, 2010 )

. Agricultural production of existing nonregulated GE and conventional corn utilize EPA

- registered pesticides for insect and plant pest management, including glyphosate

. Glyphosate has a low vapor pressure and volatility from soils ( US

- EPA, 1993b ) . Glyphosate’s EPA

- approved label provides measures for minimizing the potential air quality impacts from its use. When used in accordance with registered uses and EPA

- approved labels, glyphosate poses minimal risks to air quality. Increasing or decreasing the amount of corn production acreage and its associate d agronomic practices with emissions potentially impact air quality. As discussed in Subsection 4.2.1, Acreage and Area of Corn Production, corn is a major crop in t he U.S., expected to maintain current production levels through 2020 ( USDA

- OCE, 2011 ) . Global market forces determine the price of corn, which in turn affects grower decisions on how much to plant ( USDA

- OCE, 2011 )

. Preferred Alternative: Air Quality Maize Line HCEM485 is agronomically and compositionally equivalent to its antecedent GA21, its control cultivars, and other GE and conventional corn varieties currently in commercial production ( Stine, 2011 ; USDA

- APHIS, 2011b ) . No changes to agronomic practices that are sources of emissions or positively contribute to air quality such as the amount, type and timing of tillage, equipment use, irrigation, and the application of fertilizers or pesticides would result from extending a determination of nonregulated status to Maize Line HCEM485 under the preferred alternative . The commercial use of glyphosate is expected to remain the same if Maize Line HCEM485 were determined nonregulated, since the cultivar would replace other glyphosate

resistant corn varieties, and no changes to glyphosate’s regis tered use or label are proposed. Approximately 72% of planted corn in the U.S. is herbicide resistant, and of that, most is glyphosate resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) (see Subsection 4.2.1, Acreage and Area of Corn Production, for detailed discussion).71 Maize Line HCEM485 would not likely change the development of glyphosate

- resistant weeds or the methods used for their control that may impact air qualit y, since it is expected to replace other glyphosate

- resistant corn cultivars. In summary, there are no new impacts to air quality posed by an extension of determination of nonregulated status to Maize Line HCEM485. The potential impacts to air quality un der the Preferred Alternative are, therefore, similar to the No Action Alternative.

4.3.4 Climate Change

No Action Alternative: Climate Change The major sources of GHG emissions associated with crop production are soil N 2 O emissions, soil CO 2 and CH 4 fluxes, and CO 2 emissions associated with agricultural inputs and farm equipment operation ( US

- EPA, 2011c )

. Agricultural practices that produce CO 2 emissions include liming and the application of urea (i.e., nitrogen) fertilization to agricultural soils , and CH 4 produced by enteric fermentation and animal manure management . Agricultural soil management a ctivities including fertilizer application and cropping practices are the largest source of N 2 O emissions in the U.S. ( US

- EPA, 2011c )

. Corn crop production primarily affects climate

- changing emissions through: (1) fossil fuel burning equipment used for production and nitrogen fertilization producing CO 2 ; and, (2) cropping production practices including residue management and tillage (see Subsection 2.2.4, Climate Change, for detailed discussion). Conservation tillage practices increase crop residue on the surface, promoting the production of SOC and protecting the soil from erosive forces that would release SOC back to the air. These practices also reduce the use of emissions

- producing equipment normally used in tilling. The USDA has estimated approximately 74.5% of planted corn acres in 2010 were produced under conservation tillage practices ranging from no

- till to reduced till ( USDA

- ERS, 2011f ) . Recent increases in the incidence of herbicide

- resistant weeds, i ncluding glyphosate, may require increased tillage to affect control ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 ) . This could potentially release more SOC sequestered in upper soil lay ers; however, the particular weed management methods employed by individual farmers would be dependent on many factors unique to characteristics of the individual farm, including its agroecological setting, the particular problem weed type, and on

- farm eco nomics ( Beckie, 2006 )

. Nitrogen is also the most

- used fertilizer in U.S. corn production ( USDA

- NASS, 2 011c )

. Nitrogen in the form of urea is commonly applied to cornfields and contributes CO 2 emissions from the volatilization of ammonia. Recommended BMPs to reduce volatilization include incorporating urea with equipment, accompanied with irrigation or rainfall; topdressing urea when temperatures and soil moisture levels are low; and avoiding topdressing urea in high er risk conditions , except if there is an opportunity to incorporate the urea within a few days of application ( Jones et al., 2007 )

. Preferred Alternative: Climate Change

Because Maize Line HCEM485 is similar to other GE and non

- GE corn cultivars in terms of its growth habit, agronomic properties, disease susceptibility, and composition ( USDA

- APHIS, 2011b ) , t he agronomic practices required to cultivate Maize Line HCEM485 woul d be no different than those utilized in the production of other herbicide

- resistant corn cultivars

.72 T herefore, no changes to agricultural practices that could affect GHG emissions would be expected from extending a determination of nonregulated status to Maize Line HCEM485.

Because Maize Line HCEM485 is another glyphosate

- resistant cultivar similar to other commercially available glyphosate

- resistant corn varieties, and the majority of planted corn in the U.S. is herbicide resistant (72% in 2011) primarily consisting of glyphosate

- resistant cultivars ( Duke and Powles, 2009 ; USDA

- ERS, 2011a )

, Maize Line HCEM485 would likely replace other glyphosate

- resistant cultivars rather than expand the production of glyphosate

resistant cultivars. An extension of a determination of nonre gulated status to Maize Line HCEM485 would not likely change the development of glyphosate

- resistant weeds

, since it is expected to replace other glyphosate

- resistant maize acreage; t hus, no change to GHG emissions would occur from use of fossil fuels, rel ease of SOC, or carbon sequestration in plant residue and soils under the Preferred Alternative. As discussed under the No Action Alternative above, more diverse weed management tactics

, potentially those including more aggressive tillage practices that c an affect GHG emissions

, may be needed i n the long term to address the increasing emergence of glyphosate

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 ) . Since Maize Line HCEM485 is expected to replace other glyphosate

- resistant cultivars, its nonregulated status would not alter weed management practices and their effects on GHG contributing to clim ate change ; t herefore, the potential impacts to climate change under the Preferred Alternative would be similar to the No Action Alternative.

4.4 Biological Resources

4.4.1 Animal Communities

No Action Alternative: Animal Communities Corn production potentially impa cts animal communities through the conversion of wildlife habitat to agricultural purposes. As discussed in Subsection 2.2., Acreage and Area of Corn Production, corn was produced on approximately 92.3 million acres in 2011 , an increase of approximately 4 .1 million acres over 2010 ( USDA

- NASS, 2011b ) . Corn is expected to continue to be a major crop in the U.S. through 2020 ( USDA

- OCE, 2011 )

. A wide array of wildlife occupy and/or utilize habitats that are within or adjacent to cornfields (see Subsection 2.3.1, Animal Communities). While cornfields are less suitable for wildlife than adjacent pasture, fallow fields, windbreaks, or shelterbelts , those in conservation tillage management provide greater benefit for wildlife than those in more intensive tillage. This is because greater diversity in plants would occur that provides more habitat and potential food sources, soil would be less disturb ed, and potentially sediment and agricultural pollutant loading of nearby surface waters would be reduced, improving water quality ( B rady, 2007 ; Sharpe, 2010 )

. Glyphosate

- resistant corn varieties have been nonregulated since 1997 ( USDA

- APHIS, 2012 )

, and the majority of corn cultivated today is herbicide resistant ( USDA

- ERS, 2011a ) , primarily glyphosate

- resistant ( Duke and Powles, 2009 ) . All glyphosate

- resistant corn varieties currently available on the market have been evaluated for their food and feed safety impacts by the FDA. The EPSPS protein that confers glyphosate resistance in GA21 (the antecedent of Maize Line HCEM485) is corn

- derived, and 99.3% identical to its non

- herbicide

- resistant corn comparators ( Monsanto, 1997 ) . It has been previously evaluated by the FDA ;according to the consultation note,73 “ Monsanto has concluded that corn containing transformation event GA21 is not materially different in composition, nutrition, and safety from corn currently grown, processed, marketed, and consumed for animal feed or human food. At this time, based on Monsa nt o's description of its data and analyses, the Agency considers Monsanto's consultation on corn from varieties containing transformation event GA21 to be complete. ”

( US

- FDA, 1998a ) . Consumption of nonregulated glyph osate

- resistant corn presents minimal risk to animal communities.

Current corn agronomic practices potentially impacting animal communities include application of a gricultural inputs, such as fertilizer, herbicides, and pesticides

. Both fertilizer and pes ticides are applied to the majority of corn acres in the U.S. ( USDA

- NASS, 2011c ) and potentially impact no n

- target wildlife from ingestion or spray drift. Glyphosate is the primary herbicide applied to herbicide

- treated corn acreage in the U.S. ( USDA

- NASS, 2011c ) . As discussed in Subsection 2.1.2, Agronomic Practices, there are several glyphosate formulations ( US

- EPA, 2009b ) that differ in the timing and amount of application to field corn

. The environmental risks of glyphosate herbicides are assessed by the EPA in the pesticide registration process. The glyphosate RED was last accomplished in 1993, and the herbicide is currently undergoing registration review scheduled for the final decisio n in 2015 ( US

- EPA, 2009a ) . As discussed in Subsection 2.3.1, Animal Communities, the registered uses for glyphosate pose minimal risk to animals, but spray drift may adversely impact non

- target plants that prov ide habitat. The EPA is evaluating new regulations for labeling and BMPs to control drift ( US

- EPA, 2009d )

. When used consistent with the EPA

- registered uses and labels, glyphosate application in corn presents minimal risk to animal communities. In 2010, 66% of all active ingredients applied to corn treated with pesticides were herbicid al ( USDA

- NASS, 2011c )

.

M ore diverse weed management tactics potentially including more aggressive tillage practices that can affect animal communities may be needed to address the increasing emergence of glyphosate

- resistant and other herbicide

- resistant weeds ( Beckie, 2006 ; Owen, 2011 ; Owen et al., 2011 )

. As discussed above, more intensive tillage can reduce wildlife habitat and contribute to increased sedimentation and pollutants in runoff to nearby surface waters, affecting wat er quality that could impact wildlife. The particular mix of weed management tactics selected by an individual producer would be dependent upon many factors, including the agroecological setting, the problem weed type, and agronomic and socioeconomic fact ors important to farmers ( Beckie, 2006 )

.
Preferred Alternative: Animal Communities As part of the assessment for the proposed action, APHIS has evaluated the potential effects of each alternative on a wide array of wildlife species and their habit ats occurring in the U.S. Under the Preferred Alternative, a determination of nonregulated status would be extended to Maize Line HCEM485

, and it would be available as another glyphosate

- resistant corn and weed management option for farmers. As stated ab ove, the majority of corn planted in the U.S. today is herbicide and glyphosate resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a )

. As such, it is expected Maize Line HCEM485 as another option to other currently available glyphosate

resistant corn varieties would replace these varieties and not change the acreage or area of corn74 production in the U.S. (see Subsection 4.2.1, Acreage and Areas of Corn Production). Maize Line HCEM485 is similar in its growth and agronomic characteristics to its control comparators, its antecedent GA21

, and other nonregulated glyphosate

- resistant corn lines ( Stine, 2011 ; USDA

- APHIS, 2011b ) ; h ence, no changes to agronomic practices such as cultivation, crop rotation, irrigation, tillage, or agricultural inputs with potential impacts to wildlife and their habitat would likely occur under this alternative.

As discussed in Subsection 2.5, Animal Feed, a final food consultation with the FDA for Maize Line HCEM485 was submitted by Stine in December 2010 and is still pending. As discussed in the No Action Alternative, the food safety of t he EPSPS protein conveying glyphosate resistance

was previousl y established by an FDA evaluation

. Because the composition of Maize Line HCEM485 is similar to its antecedent GA21 and other nonregulated glyphosate

- resistant corn lines ( Stine, 2011 )

, with no expected hazards associated with its consumption, the risk of Maize Line HCEM485 affecting wildlife species is also unlikely, regardless of exposure.

Commercial use of glyphosate is not expected to change as a result of an extension of a determination of nonregulated status to Maize Line HCEM485. Based upon information provided by Stine ( 2011 ) , Maize Line HCEM485 is simi lar in its growth characteristics to its antecedent GA21 and other nonregulated glyphosate

- resistant corn. No changes to the registered uses or labels of glyphosate products would be required to apply it to Maize Line HCEM485. Consequently, there would be no difference in the potential of Maize Line HCEM485 cultivation to impact wildlife or habitat from th at of other nonregulated glyphosate

- resistant corn varieties

. As discussed above, the EPA is currently evaluating new regulations for labeling and BMP s to control drift. When used consistent with the EPA

- registered uses and labels, glyphosate application in Maize Line HCEM485 fields presents minimal risk to animal communities.

An extension of a determination of nonregulated status to Maize Line HCEM4 85 would not change the development of glyphosate

- resistant weeds or the methods used for their control that may impact animal communities, such as increased tillage. As discussed above, Maize Line HCEM485 would likely replace other glyphosate

- resistant c orn cultivars that currently comprise the majority of the 72% of corn acres planted with herbicide

- resistant cultivars

. Based on the above, the impacts of extending a determination of nonregulated status to Maize Line HCEM485 to animal communities would be similar to those of the No Action Alternative.

4.4.2 Plants Communities

No Action Alternative: Plant s Communities

T he majority of U.S. corn acres are planted with GE herbicide

- resistant corn cultivars. Plants communities are varied and adapted to local climate and soil, as well as the frequency of natural or human

- induced disturbance ( Smith and Smith, 2003 ) . Non

- crop vegetation in cornfields is limited by farmers’ cultiva tion and weed control practices. Plants communities adjacent to cornfields commonly include other crops, borders, hedgerows, windbreaks, pastures, a nd other natural vegetation.

Agricultural practices affect plants communities by exerting selection pressures that influence the type and composition of plants present in a community. Preparation of fields for planting of75 crops removes other plants that compete for light and nutrients. Natural selection in frequently disturbed environments enable s colonization by plants exhibit ing early germination and rapid growth from seedling to sexual maturity, and the ability to reproduce sexually and asexually ( Baucom and Holt, 2009 ) . These weedy characteristics enable such plants to spread rapidly into areas undesired by humans.

Weeds are the most important pest in agriculture, competing for light, nutrients, and water and can significantly affect yields ( Gibson et al., 2005 ; Baucom and Holt, 2009 )

. Weeds commonly encountered in corn production include water hemp, giant ragweed, common lambsquarters, and others as described in Subsection 2.3.2, Plants Communities. Agronomic practices common in corn production, such as tillage and herbicide use

, impar t selection pressures on the weed community that can result in shifts in the relative importance of specific weeds ( Owen, 2008 )

. In aggressive tillage systems, weed diversity tends to decline and annual grasses and broadleaf plants are the dominant weeds ; whereas, i n no

- till fields, greater diversity of annual and perennial weed species may occur ( Baucom and Holt, 2009 )

. The most common weed management tactic in U.S. corn production is to use h erbicides. Recent estimates indicate herbicides are applied to 98% of planted corn acreage, and on that acreage, the most applied herbicide is glyphosate ( USDA

- NASS, 2011c )

. Herbicide resistance occurs when a plant survives the application of an herbicide and reproduces, passing on its resistance to new generations . Herbicide

- resistant weeds can become
agr onomically important as they out

- compete crops and require additional resources to affect control. As discussed in Subsection 2.3.2, Plants Communities , weed species resistant to glyphosate are becoming more agronomically important in crop production. For example, glyphosate

- resistant Palmer pigweed (amaranth) is a major economic problem in the Southeast U.S. while glyphosate

- resistant waterhemp is an economically important weed in Midwestern
states ( Culpepper et al., 2006 ; Owen, 2008 )

. In response, producers are diversifying weed management tactics in corn production to include alternating crops resistant to different herbicide modes of action grown in a field, alternating the herbicide modes of action used, practicing more crop rotation, and increasing tillage to affect control of herbicide

- resistant weeds ( Owen et al., 2011 ) . Weeds are also developing resistance to multiple herbicides as well, but are also controlled with adjustments to practices such as crop rotation and tillage ( Owen et al., 2011 )

. As discussed in Subsection 2.3.3, Gene Flow and Weediness, t here are no extant populations of sexually compatible species related to Z

. mays within the continental U.S., its territories, or
posse s sions ; therefore, APHIS ( 2011b ) has concluded there is no significant risk of gene flow between cultivated corn and its weedy relatives that may impact plants communities.

Volunteer herbicide

- resistant corn pose an additional management challenge when they appear in subsequent crops with the same resistance and can be extensive and problematic (see Subsection 2.3.2, Plants Communities). Typical agronomic practices, however, are effective in the management of volunteer corn. Glyphosate

- resistant volunteer corn is being controll ed by the application of effective herbicides (e.g., ACCase and ALS inhibitors), mechanical means, and rotation of crops with resistance to different herbicide modes of action ( Beckie and Owen, 2007 ; Zollinger et al., 2011 )

. The incidence of glyphosate

- resistant volunteer corn in cornfields where it was not planted the year before as a result of pollen

- mediated gene flow can be controlled by76 maintaining adequate spatial or temporal isolation distances between corn crops. See Subsection 2.3.3, Gene Flow and Weediness, for a description of po llen

- mediated gene flow in corn.

The application of an herbicide in corn production has the potential to impact non

- target plants communities through spray drift, volatilization (evaporation), its adsorption to soils incorporated in runoff, leaching, and cleaning and disposal of the equip ment used to dispense it. The EPA is currently evaluating new regulations for pesticide drift labeling and the identification of BMPs to control such drift ( US

- EPA, 2009d ) , as well as identifying scientific issues surrounding field volatility of conventional p esticides ( US

- EPA, 2010 )

. G lyphosate is currently under review by EPA for continued registration of the herbicide, with a reregistration decision expected in 2015 ( US

- EPA, 2009a ) . Glyphosate is toxic to most terrestrial and aquatic plant s, inducing plant death. The herbicide has low leaching potential

, low vapor pressure , and low volatility from soils ( US

- EPA, 1993b ; Senseman, 2007 ) . In its 1993 glyphosate reregistration decision, the EPA required additional studies concerning vegetative vigor, droplet s ize spectrum, and a drift field evaluation that did not affect the reregistration eligibility of the herbicide ( US

- EPA, 1993 a ) . The potential effects of glyphosate spray drift are minimized by EPA

- approved labels that provide detailed measures to manage spray drift

, including optimal wind conditions, temperature inversions, humidity, spray droplet size, sprayer boom heights , aerial spraying by aircraft measures, and inclusion of drift reduction additives ( Monsanto, 2010 )

. In summary, under the No Action Alternative, natural selection, and the selection pressure exerted through the use of herbicides and other agronomic practices, impact plants communities by either inducing plant death, selecting for weedy characteristics, inducing shifts in the composition of the plant community, through gene flow to other related plants, and in some cases, contributing to the development of herb icide

- resistant weeds.

Preferred Alternative: Plant s Communities Impacts of Maize Line HCEM485 to plants communities adjacent to or within agroecosystems would not be different from current ly available glyphosate

- resistant corn cultivars. As discussed in Subsection 4.2.2, Agronomic Practices, the agronomic and phenotypic characteristics of Maize Line HCEM485 have been evaluated in field trials ( Stine, 2011 ) and determined by APHIS to be similar to its comparator corn cultivars, and its antecedent GA21 ( USDA

- APHIS, 2011b ) . Maize Line HCEM485 would, therefore, be cultivated similar to other glyphosate

resistant corn, and have impacts to plants communities similar t o those described under the No Action Alternative.

An extension of a determination of n onregulated status to Maize Line HCEM485 would not be expected to increase or decrease the development of glyphosate

- resistant weeds. As another glyphosate

- resistant co rn cultivar option, Maize Line HCEM485 would likely replace other glyphosate

- resistant corn cultivars without changing the application of glyphosate to corn. No changes to glyphosate’s registered uses or labels for use on Maize Line HCEM485 are proposed b y Stine, and no increase in glyphosate

- resistant corn production acres is anticipated.

As discussed above, corn has few sexually compatible relatives in the U.S., and there is little risk of its cultivation contributing to weediness tha t may impact plants communities; f urther, APHIS has determined that there are no phenotypic differences between Maize Line HCEM485 and control lines that would contribute to enhanced weediness ( USDA

- APHIS, 2011b )

. Herbicide

-77 resistant corn such as Maize Line HCEM485 has the potential to impact other crops in the same fields or adjacent fields in later seasons as volunteers. As Maize Line HCEM485 is similar to other nonregulated corn cultivars, its v olunteers would be controlled by common agronomic practices as discussed unde r the No Action Alternative.

Based on these findings, the potential impact to other vegetation in corn and the landscapes surrounding cornfields from extending a determination of nonregulated status to Maize Line HCEM485 is not expected to differ from th e No Action Alternative.

4.4.3 Gene Flow and Weediness

No Action Alternative: Gene Flow and Weediness As described in Subsection 2.1.2, Agronomic Practices, corn is the largest crop grown in the U.S. in terms of value ( USGC, 2010 ) , acreage planted, and geographic area of production, and is predicted to remain an important crop in USDA projecti ons to 2020 ( USDA

- OCE, 2011 ) . Gene flow may occur through dispersal of vegetative tissues, pollen, or seed. A sexual reproduction and gene flow as a result of dispersal of vegetative tissues does not occur with corn. Corn is self

compatible and primarily pollinated by wind or gra vity

, with minimal contribution from insect pollination ( McGregor, 1976 ; Thomison, 2009 ) , and is propagated by seed

. As discussed in Subsection 2.3.3, Gene Flow and Weediness, a ltho ugh some teosinte species are culturally and biologically similar to corn, no successful weedy species have been documented ( US

- EPA, 2011b )

. There are no extant populations of sexually compatible species re lated to domesticated Z

. mays within the continental U.S., its territories, or posse s sions ; therefore, APHIS ( 2011b ) has concluded that there is not a significant risk of gene movement between corn and its wild or weedy maize relatives

. The reproduc tive morphology of corn encourages cross

- pollination between corn plants and there is no evidence (genetic or biological barriers) to indicate that gene flow is restricted between genetically modified, conventional, and organic corn. Spatial and temporal isolation can be the most effective barriers to gene exchange between corn crop cultivars. Requirements and methods to ensure seed and crop purity are discussed in more detail in Subsections 2.1.3, Corn Seed Production, and 2.1.4, Organic Corn Production.

Corn does not possess the characteristics for efficient seed

- mediated gene flow. Through thousands of years of selective breeding by humans, corn has been extensively modified to depend on human cultivation for survival ( Doebley, 2004 ) . As a result of its domestication, corn is not able to survive in the wild and also has several traits that greatly reduce its ability to disperse via seeds ( OECD, 2003 )

. Corn seed lost after harvest may survive in fields and develop into volunteer plants, but such volunteers are controlled with common agron omic practices (see Subsection 2.3.2, Plants Communities).

H orizontal gene flow or gene flow to unrelated species in any currently cultivated corn is unlikely

, and i t s potential occurrence in any crop is discussed more theoretically than practically

. It has never been documented under realistic conditions ( Stewart, 2008 ) (see Subsection 2.3.3, Gene Flow and Weediness). The horizontal transfer of entire transgenes, including portions of78 the DNA that code for the production of specific proteins, has never been shown to occur in
nature ( Stewart, 2008 ) , and the risk of its occurrence in corn cultivation is considered low

.
Preferred Alternative: Gene Flow and Weediness Under the Preferred Alternative, Maize Line HCEM485 would be commercially available as an additional glypho sate

- resistant corn option for use by producers. APHIS evaluated the potential for gene flow between Maize Line HCEM485 and its wild relatives, other corn cultivars, and other unrelated species. Phenotypic testing of Maize Line HCEM485 and agronomic tria ls have demonstrated the cultivar is similar to other glyphosate

- resistant corn varieties and its antecedent GA21 corn ( USDA

- APHIS, 2011b )

. Therefore

, its potential for gene flow and weediness would be no different than other corn varieties currently on the market as described under the No Action Alternative.

4.4.4 Microorganisms

No Action Alternative: Microorganisms Soil microorganisms are important in soil structure formation, decomposition of organic matter, toxin removal, nutrient cycling, and most biochemical soil processes ( Garbeva et al., 2004 )

. They may also suppress soil

- borne plant diseases and promote plant growth ( Doran et al., 1996 )

. As described in Subsection 2.3.4, Microorganisms, t he main factors affecting microbial population size and diversity include soil and plant type, and agricultural management practices (crop rotation, tillage, herbicide and fertilizer application, and irrigation) ( Garbeva et al., 2004 )

. Plant roots, including those of corn, release a v ariety of compounds into the soil creating a unique environment for microorganisms in the rhizosphere.

GE plants potentially impact soil microbes directly from the transfer of introduced genetic material , exposure to expressed proteins through root exudat ion and crop residue incorporated into soil , or changes in agronomic practices used to produce crops. Indirect impacts may arise from changes in the amount and composition of residue from crops.

Gene transfer between microorganisms is common ( Keese, 2008 ; McDaniel et al., 2010 )

. Yet, biodegradation of plant materials t illed into soils generally results in fragmentation of DNA strands into small pieces ( Lerat et al., 2007 ; Levy

- Booth et al., 2008 ; Hart et al., 2009 ) , which would be unlikely to represent an intact entire cp4 epsps gene. Cleaves et al. ( 2011 ) have evaluated the ability of shorter DNA strands to adsorb to soil aggregates, potentially affecting their persistence in soil; however, these were likely unable to convey functional genes. However unlikely, if a microorganism incorporated an intact cp4 epsps gene, it might transf er the gene to other microorganisms, resulting in a greater presence of the gene in the environment. As described in Subsection 2.3. 3 , Gene Flow and Weediness, gene transfers between plants and microorganisms are thought to occur on an evolutionary timesc ale. The cp4 epsps gene in the form of herbicide

resistant crops has been approved for release under 7 CFR part 340 and the plant pest provisions of the Plant Protection Act since 1994 ( USDA

- APHIS, 2012 ) . An incremental increase in gene transfer among microorganisms under the No Action Alternative is unlikely.

The potential for intact CP4 EPSPS protein conveying glyphosate resistance to remain functiona l in soils is remote, be cause the protein degrades once it is released from cells

, decaying in soils ( Australian Government, 2006 )

. If some molecules did persist in soils, there is no reason to79 anticipate toxicity of the CP4 EPSPS protein to soil microbes. Studies of the impact of GE crops on soil microbial communities have indicated there have been minor to no non

- target effects, bu t induced targeted alterations to the composition of the microbial community have usually resulted in the inhibition of plant pathogenic organisms ( Kowalchuk et al., 2003 )

. Root exudates have been found to promote certain microbial populations, such as soybeans symbi otic relationship with nitrogen

- fixing bacteria, and other free

- living microbes that have co

evolved with plants that supply nutrients to and obtain food from their plant hosts ( USDA

NRCS, 2004 ; Bais et al., 2006 )

. Management practices used in corn production can affect soil microorganisms by altering microbial p opulations and activity through modification of the soil environment. As presented in Subsection 2.3.4, Microorganisms, crop rotation, irrigation, tillage, and agricultural chemicals such as fertilizers and pesticides affect microbial community
structure and functions such as nutrient cycling, disease promotion or suppression, and presence in soil. As discussed in Subsection 2.1.2, Agronomic Practices, the adoption of glyphosate

resistant corn (and other herbicide

- resistant crops) has enabled the use of c onservation tillage, creating less soil disturbance and retaining more crop residue which ha s been found to increase soil microbe population diversity ( Lock e et al., 2008 ) . An agronomic practice may be beneficial for one microorganism but detrimental to another. For example, the primary agents degrading glyphosate in soil and water are microorganisms feeding on the herbicide ( Senseman, 2007 )

. As discussed in Subsection 2.3.4, Microorganisms, results from investigations into the toxicity of glyphosate to microorganisms are varied

. R eview s of studies investigating the impact of glyphosate on soil microorganisms found that numerous studies did no t detect adverse effects under field use conditions

, others found minor effects that could not be separated from changes in habitat

, and still others reported effects at or near normal glyphosate use rates

, but in most

cases , the effects were minor and tem porary ( Giesy et al., 2000 )

. Other studies have implicated glyphosate in an increase in the population and virulence of certain pl ant diseases

, as well as the increased susceptibility to some diseases in glyphosate

- resistant crop varieties ( as reviewed in Johal and Huber, 2009 )

. The authors suggest m easures to minimize this potential include using the minimum amount of glyphosate necessary for weed management, amending soils with micronutrients, detoxifying meristematic (i.e., growth) tissues by adding chelating agents to the soil, and detoxifying root exuda tes through the regular inoculation of nitrogen

- fixing organisms ( Johal and Huber, 2009 )

. APHIS has previously examined in detail the potential impacts of glyphosate to microorganisms in the cultivation of glyphosate

- resistant alfalfa and sugar beets ( USDA

- APHIS, 2010 ; USDA

APHIS, 2011a ) . Based on extensive review of the literature, they conclude glyphosate application might favor development of detrimental microbial species (or harm som e beneficial microbes); however, to date

, there is no conclusive evidence linking applications of glyphosate to changes in soil microbial communities that have adverse effects on plants grown in those soils.

Corn cultivation, including the production of gl yphosate

- resistant corn and its potential impacts to soil microorganisms, is expected to continue under the No Action Alternative. The majority of corn grown in the U.S. is herbicide resistant, and glyphosate is the most applied herbicide to

corn ( USDA

- ERS, 2011a ; USDA

- NASS, 2011c ) . Farmers have access t o non

- glyphosate

resistant corn varieties, and manage their crops by implementing practices to control pests and weeds, including the use of glyphosate

.80 Preferred Alternative: Microorganisms

Extension of a determination of nonregulated status to Maize Line HCEM485 is not expected to result in any new impacts to microbial communities. Maize Line HCEM485 is genetically equivalent to its GA21 antecedent for expression of the EPSPS protein ( Stine, 2011 ; USDA

APHIS, 2011b ) . All the sequences inse rted into Maize Lane HCEM485 are the same as those associated with the native EPSPS

- encoding gene in corn ( USDA

- APHIS, 2011b ) . As such, nothing new or unique would be introduced into the environment that may impact the microbial community under the Preferre d Alternative.

Maize Line HCEM485 has been determined to be agronomically and compositionally similar to its antecedent GA21

, as well as other nonregulated glyphosate

- resistant corn varieties ( USDA

APHIS, 2011b ) . It is not expected to change the acreage or area of glyphosate

- resistant corn production that potentially would expand the use of glyphosate herbicide with potential impacts to soil microorganisms. Maize Line HCEM485 is another glyphosate

- resistant corn cultivar likely to replace other nonregulate d glyphosate

- resistant corn varieties . Approximately 72% of corn cultivated in the U .S. today is herbicide

- resistant and the majority of herbicide

- resistant corn is glyphosate

- resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a )

. Because Maize Line HCEM485 is agronomically similar to its antecedent GA21 and other glyphosate

- resistant and conventional corn, its cultivation would not change the agronomic practices needed for its cultivation, such as amount and rate of glyphosate application. Since the use of glyphosate for corn production is not expected to change under the Preferred Alternative, there would be no change to potential impacts to microorganisms from th ose of th e No Action Alternative.

4.4.5 Biodiversity

No Action Alternative: Biodiversity

All the plants, animals, and microorganisms interacting in an ecosystem contribute to biodiversity ( Wilson, 1988 ) that provides valuable life functions. In agriculture, biodiversity contributes to critical functions such as pollination, genetic introgression, biological control, nutrient recycling , and other processes the loss of which requires costly management ( Altieri, 1999 )

. Concerns regarding the potential impacts to biodiversity associated with the introduction of GE crops (and crops in general) include the loss of dive rsity, which can occur at the crop, farm, and/or landscape scale ( Visser, 1998 ; Ammann, 2005 ; Carpenter, 2011 ) ( s ee Subsection 2.3.5, Biodiversity).

At the crop scale, research suggests that developing GE crops has introduced novel genes that has not decreased crop diversity because of widespread use of the traits in multiple br eeding programs, and the technology enables the introduction of novel genes in crops ( Ammann, 2005 ; Carpenter, 2011 ) . Additionally, the c oncern for the loss of genetic variability has led to the establi shment of an extensive network of genebanks ( van de Wouw et al., 2010 ) , in cluding an active collection of more than 14,000 accessions of corn at the ARS North Central Regional Plant Introduction Station at Iowa State University, Ames, Iowa ( USDA

- ARS, 2005 )

. These collections are shared with researchers worldwide, which helps ensure a continuous reservoir of genetic diversity for future crop development. Under this alternative, g rowers have access to existing nonregulated herbicide

- resistant and other GE corn varieties, as well as other non

- GE corn varieties , while Maize Line HCEM485 would remain a regulated article.81 At the farm scale, agronomic practices that can impact biodiversity include cropping practices (e.g., strip or contour cropping, crop rotatio n), soil conservation practices that maintain grass strips, windbreaks and shelterbelts and the like, tillage, and the application of agrochemicals. The rotation of crops and strip contour cropping provide varied habitat that can benefit biodiversity. Re cently, t here has been an increase in corn

- to

- corn rotation given the profitability of corn production ( USDA

- ERS, 2011d ) . As discussed in Subsection 2.1.2., Agronomic Practices, continuous corn production must be highly managed to maintain pro ductivity, which can be less beneficial to biodiversity; however, the practice does accumulate more crop residue that benefit s some species. The establishment of soil conserving grass and other vegetative borders stabilize soil that maintains additional wildlife habitat, and improves the quality of existing habitat (such as surface water quality) that contributes to biodiversity . Allowing unproductive field edges to become managed wildlife habitat promotes diversity in both plants and animal species ( Sharpe, 2010 )

. Herbicides are used to control plants in areas where humans do not want them. As described in Subsection 2.1.2, Agronomic Practices, weeds compete with crops for light and nutrients, reducing yields. Glyphosate effectively kills grass and broadleaf plants when applied at the recommended rates. At the farm scale, h erbicide use in agricultural fields may impact biodiversity by decreasing weed quantities or causing a shift in weed species present in the field, which may affect those insects, birds, and mammals that utilize these weeds. The quantity and type of herbicide use associated with herbicide

- resistant corn crops, however, is dependent on many variables, including cropping systems, type and abundance of weeds, productio n practices, and individual grower decisions. See Subsection 2.1.2, Agronomic Practices, for a detailed discussion of pesticide use in corn production. The effects of glyphosate on plants and animals are presented in the following discussion of landscape

- scale biodiversity.

Use of herbicide

- resistant crops such as corn has been linked to increased rates of conservation tillage in U.S. crop production ( Givens et al., 2009 ) . This promotes biodiversity by allowing the establishment o f other plants between crop rows and the accumulation of more plant residue that creates more soil organic matter, food, and cover for wildlife. In a review of literature that assessed the impacts of GE crops on biodiversity, Carpenter ( 2011 ) found that, for the most part, impacts to biodiversity have been positive due to increased yields, decreased usage of insecticides, us e of more environmentally friendly herbicides, and facilitation of conservation tillage

. In 2010, 62% of planted corn acreage in 19 surveyed states was dedicated to no

- till or minimum till systems ( USDA

- NASS, 2011c )

. As described in Subsection 2.3.2, Plants Communities, the increasing incidence of herbicide

- resistant weeds is also causing farmers to
turn to more diversified weed management strategies, including increased tillage that potentially reduces biodiversity.

Crop production in general impacts biodiversity at the landscape scale by potentially converting natural lands that have greater animal and pl ant species diversity to more monocultural landscapes. Corn is the largest crop grown in the U.S. in terms of acre age planted and geographic area of production with over 92 million planted acres in 2011 ( USDA

- NASS, 2011b )

. USDA projections to 2020 indicate the acreage devoted to corn production in the U.S. will remain relatively stable at this level ( USDA

- OCE, 2011 )

.82 Area

- wide herbicide application may negatively impact species that are dependent on the targeted weeds , reducing diversit y. As stated above, the majority of corn cultivated in the U.S. is treated with herbicides and glyphosate is the most

- applied herbicide to corn ( USDA

- NASS, 2011c ) . P otential impacts to landscape

- scale diversity can be related to the effects of herbicides

on non

- target animal and plant species. Assessments of the toxicity of glyphosate to animal species indi cate a minimal risk to animals

, but it is toxic to targeted plants and may affect non

targeted plants and animals through spray drift, volatilization ( i.e., evaporation) and runoff. Inadvertent exposure may cause adverse effects to plants composing animal s’ habitat that could lead to a decrease in biodiversity . As discussed in Subsection 2.3.1, Animal Communities, glyphosate was found by the EPA to be no more than slightly toxic to birds, moderately toxic to practically nontoxic to fish, and practically n ontoxic to aquatic invertebrates and honeybees ( US

EPA, 1993b )

. T he EPA is currently evaluating additional labeling requirements concerning BMPs for controlling pesticide spray drift (see Subsection 2.3.2, Plants Communities). While herbicide use potentially affects biodiversity, the application of pesticides in accordance with registered uses and label instructions, and careful management o f chemical spray drift, minimizes the potential impacts from their use.

In 2009, the EPA initiated reregistration of glyphosate and has identified additional data needs. Part of the risk assessment will include an acute avian oral toxicity study for pas serine species. Additionally, some inert ingredients used a s surfactants are more toxic than glyphosate to aquatic organisms, and will be evaluated for acute toxicity to estuarine and marine mollusk, invertebrates, and fish ( US

- EPA, 2009b )

. Preferred Alternative: Biodiversity
Under the Preferred Alternative, an extension of a determination of nonregulated status to Maize Line HCEM485 w ould provid e growers an additional glyphosate

- resistant corn variety. Maize Line HCEM485 is functionally the same as its antecedent GA21 and other GE and non

- GE corn with regard to agronomic characteristics, growth, reproductive habit, utilization of reso urces, and production practices ( Stine, 2011 ; USDA

- APHIS, 2011b )

. Extending a determination of nonregulated status to Maize Line HCEM485 is unlikely to have any direct effects on non

- target organisms associated with exposure to its gene prod ucts and the modified EPSPS protein expressed by the cultivar. The genetic material in and proteins produced by Maize Line HCEM485 are similar to those of the nonregulated antecedent GA21 and other corn varieties in commercial production ( USDA

- APHIS, 2011b )

. An extension of a determination of nonregulated status to Maize Line HCEM485 would, therefore, have no impact on biodiversity at the crop

- , farm

- or landscape scales

.

Because Maize Line HCEM485 is another glyphosate

- resistant cultivar option, it would likely replace other glyphosate

- resistant corn varieties without expanding the acreage or area of corn production that could impact farm

- and landscape

- scale biodiversity. Approximately 72% of corn planted in the U.S. in 2011 was herbicide resistant, and the majority of herbicide

- resistant corn is glyphosate

- resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) . Also, based on its similarity to other corn as described above, Maize Line HCEM485 would not result in changes to agronomic practices such as crop rotation, soil conservation, tillage, weed management, or pesticide use that potentially impact farm

- or landscape

- scale biodiversity

.83 Based on the above information, APHIS has concluded the extension of a determination of nonregulated status to Maize Line HCEM485 under the Preferred Alternative would not have impacts to crop

- , farm

- , or land scape

- scale biodiversity any different than other currently available glyphosate

- resistant corn cultivars . As such, the impacts to biodiversity under this alternative would be similar to the No Action Alternative.

4.5 Human Health

4.5.1 No Action Alternative: Huma n Health As discussed in Subsection 2.1.1, Acreage and Area of Corn Production, 88% of corn grown in the U.S. in 2011 was GE ( USDA

- ERS, 2011 a ) . The majority of GE herbicide

- resistant corn grown in the U.S. is glyphosate resistant ( Duke and Powles, 2009 ) . Human health concerns associated with GE crops include the potential toxicity of the introduced genes an d their products, the expression of new antigenic proteins, and/or altered levels of existing allergens ( Malarkey, 2003 ; Dona and Arvanitoyannis, 2009 ) . Previous studies of the EPSPS protein, which confers glyphosate resistance, found that the EPSPS protein expressed through genetic engineering poses no potential for toxicity or allergenicity ( Harrison et al., 1996 ; Ridley et al., 2002 ; Batista et al., 2005 ; Hoff et al., 2007 ; Herouet

- Guicheney et al., 2009 ) . Some people are allergic to corn, but corn is not included in the FALCPA as one of the most common food allergens (see Subsection 2.4, Human Health). An additional concern with GE food crops is the potential for i ncreased levels of anti

- nutrients ( Dona and Arvanitoyannis, 2009 ) . As discussed in Subsection 2.4, Human Health, there are several naturally occurring anti

- nutrients found in corn, including phytic acid, DIMBOA, raffinose, and low level s of trypsin and chymotrypsin inhibitors ( OECD, 2002 ) . In a study of the CP4 EPSPS protein conferring glyphosate resistance, Ridley et al. ( 2002 ) found the genetic modification to confer glyphosate resistance did not significantly change any of the 51 biologically and nutritionally important components evaluated.

Under the FFDCA, it is the responsibility of food and feed manufacturers to ensure that the products they market are safe and properly labeled. The food safety evaluation of the EPSPS protein imparting g lyphosate resistance was completed by the FDA on the GA21 corn variety (BNF No. 000051) on February 10, 1998 ( US

- FDA, 1998a )

. According to the consultation note,

“ Monsanto has concluded that corn containing transformation event GA21 is not materially different in composition, nutrition, and safety from corn currently grown, processed, marketed, and consumed for animal feed or human food. At this time, based on Monsa nt o's description of its data and analyses, the Agency considers Monsanto's consultation on corn from varieties containing transformation event GA21 to be complete. ”

No food safety issues were found by the FDA in previous consultations regarding the EPSPS protein in corn or any other GE corn cultivars (See the FDA website Final Biotechnology Consultations http://www.fda.gov/Food /Biotechnology/Submissions/ucm225108.htm )

. Ag ricultural production of nonregulated GE and non

- GE corn utilize EPA

- registered pesticides for insect and plant pest management under the No Action Alternative , including glyphosate

. Glyphosate may also be applied to regulated Maize Line HCEM485 cultivate d under confined84 conditions. The environmental risks of pesticide use are assessed by the EPA in the pesticide registration process and a pesticide is regularly reevaluated by the EPA to maintain its registered status under FIFRA. The human health effect s from exposure to glyphosate have been evaluated by the EPA. The 1993 glyphosate RED presents the data used by the EPA for chemical reregistration ( see US

- EPA, 1993b ) . As previously discussed in Subsection 2.4, Human Health, the review for reregistration began in July 2009; the EPA is currently conducting a comprehensive human health assessment for all uses of glypho sate and its salts ( US

- EPA, 2009b )

. The glyphosate RED pr esents the EPA ’ s analysis of the toxicity, carcinogenicity, and developmental toxicity of this herbicide

. Glyphosate is classified as having low toxicity via the oral, dermal, and inhalation routes and is not classified as a carcinogen or teratogen ( U S

- EPA, 2009b ; US

- EPA, 2009c ) . Moreover, neurotoxicity has not been reported in any acute, subchronic, chronic, developmental, or reproductive studies, although additional studies will occur as part o f the current review process ( US

- EPA, 2009c ) . Based on additional toxicity tests, the EPA determined the main glyphosate metabolite AMPA does not require regulation ( US

EPA, 2009c )

. As presented in Subsection 2.4, Human Health, pesticide tolerance levels for glyphosate on field corn such as Maize Line HCEM485 have been established ( US

- EPA, 2011e )

. Tolerances are the limits on the amount of pesticide that may remain on or in foods marketed in the U.S., that are established for every pesticide based on its potential risks to human health. The maximum tolerance level for glyph osate in field corn is 5.0 ppm for grain (40 CFR §180.364).

It has been suggested that the importance producers place on worker safety, perceived increased simplicity and flexibility of farm management, and decreased risk in production can be partially

a ttributed to the high rate of adoption of GE crops ( NRC, 20 04 ) . Producers and farm workers experience reduced exposure to potentially harmful pesticides compared to before adoption of GE crops and are also able to spend less time applying pesticides with greater flexibility in determining when pesticides are applied. There are no data indicating that workers exposed to herbicide

- resistant corn (raw or byproducts), such as that could occur during production, transportation, and milling, have experienced adverse reactions. While a small portion of the populati on does suffer from corn allergies, the EPSPS protein that confers glyphosate resistance in Maize Line HCEM485 has been determined not to be an allergen (see Subsection 2.4, Human Health).

Agricultural workers that routinely handle glyphosate (mixers, lo aders, and applicators) may be exposed during and after use. Due to glyphosate’s low acute toxicity and lack of carcinogenicity and other toxicological concerns, occupational exposure data is not required for reregistration ( US

- EPA, 1993b ) ; however, the glyphosate RED does classify some end

- use glyphosate products as eye and skin irritants and recommends PPE be worn by mixers, loaders, and
app licators ( US

- EPA, 1993b ) . Additionally, due to the potential for skin and eye irritation, the EPA has set the restricted entry interval for glyphosate to 12 hours after products have been applied. Due to the expected short

- term dermal and inhalation exposures of occupational handlers and growers, no endpoints were identified by the HED, and as such, no occupational handler or occupational pos t

- application assessments are required for reregistration ( US

- EPA, 2009c ) . C urrent EPA

- approved label s for glyphosate include precautions and measures to protect human health. When used consistent with the label, pesticides present minimal risk to human health and safety.85 4.5.2 Preferred Alternative: Human Health Maize Line HCEM485 is a GE variety of corn that has been modified to add resistance to the herbicide glyphosate ( Stine, 2011 ) . This resistance was conferred using an altered sequence of DNA derived from the corn genome accomplished by the removal and modification of the epsps gene from an inbred corn line so that it encodes a double mutated 2mEPSPS enzyme, which was subsequently reintroduced back into the corn DNA. The 2mEPSPS enzyme product is identical to that produced by the antecedent GA21 corn ( USDA

- APHIS, 2011b ) . In addi tion, a ll promoter, intron, and terminator sequences inserted into HCEM485 are the same as those already associated with the native EPSPS

- encoding gene in corn. As discussed above, studies have found that the EPSPS protein expressed in glyphosate

- resistan t crops is compositionally similar to, and is as safe and nutritional as, the same non

- GE crops ( Ridley et al., 2002 ; Batista et al., 2005 ; Herou et

- Guicheney et al., 2009 )

. APHIS considers the FDA regulatory assessment in making its dete rmination of the potential impacts of removing a new agricultural product from regulated status. As discussed in Subsection 2.4, Human Health, a biotechnology consultation of the EPSPS protein that confers glyphosate resistance was completed by the FDA on the GA21 corn variety (BNF No. 000051) on February 10, 1998 ( US

- FDA, 1998a )

. According to the consultation note,

“ Monsanto has concluded that corn containing transformation event GA21 is not materially different in composition, nutrition, and safety from corn currently grown, processed, marketed, and consumed for animal feed or human food. At this time, based on Monsant o's description of its data and analyses, the Agency considers Monsanto's consultation on corn from varieties containing transformation event GA21 to be complete. ”

Stine submitted a safety and nutritional assessment of food and feed derived from Maize Line HCEM485 to the FDA in December 2010 in support of the consultation process with the F DA for the commercial distribution of Maize Line HCEM485. Based on the above information and its similarity to the antecedent GA21 corn, potential impacts to food safety from production of Maize Line HCEM485 would be similar to the No Action Alternative.

Under the Preferred Alternative, pesticide tolerance levels for glyphosate on field corn would not change. Tolerances are the limits on the amount of pesticide that may remain on or in foods marketed in the U.S. established for every pesticide based on its potential risks to human health. As specified in 40 CFR §180.364 , the glyphosate tolerance level for field corn grain is 5.0 ppm. As discussed in Subsection 4.2.2, Agronomic Practices, the use of glyphosate in corn production would be unaffected by a n extension of a determination of nonregulated status to Maize Line HCEM485. The application rate of glyphosate in corn would not likely change as a result of the Preferred Alternative since Maize Line HCEM485 is expected to replace other glyphosate

resis tant corn cultivars (see Subsection 4.2.1, Acreage and Area of Corn Production), is similar to other nonregulated glyphosate

- resistant cultivars in its cultural requirements, and no change to the registered use of glyphosate is proposed.

Potential risks to occupational handlers and growers during glyphosate a pplication to Maize Line HCEM485 would be the same as those presented under the No Action Alternative. There would be no increased risk to workers’ health or safety from exposure to Maize Line HCEM48 5 corn or86 byproducts during typical agricultural

- related activities. Moreover, as discussed above, the application rate of glyphosate would not likely change and no change to the registered use of glyphosate is proposed under the Preferred Alternative. P otential risks to farm workers from the use of glyphosate would be the same as the No Action Alternative.

APHIS conclude s impacts to human health or worker safety from an extension of nonregulated status to Maize Line HCEM485 under the Preferred Alternativ e would be similar to the No Action Alternative

4.6 Animal Feed

4.6.1 No Action Alternative: Animal Feed As described in Subsection 2.5, Animal Feed, most of the corn produced in the U.S. is for animal feed that is consumed primarily by cattle, poultry, and swine ( NCGA, 2011 ; USDA

- ERS, 2011d ) . Corn comprises approximately 96% of the total feed grain produced in the U.S. ( USDA

ERS, 2011d ) . In 2011, corn was grown on 92.3 million acres ( USDA

- NASS, 2011b ) and measurably produced in all sta tes but Alaska ( USDA

- NASS, 2009a ) . As discussed in Subsection 2.5, Animal Feed, 44% of the corn consumed in the U.S. in 2010 was used for animal feed ( USDA

- ERS, 2011d ) . In 2011, 72% of the corn produced in the U.S. was genetically engineered to be resistant to herbicides, consisting primarily of glyphosate

- resistant culti vars ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) . The amount of corn that is used for feed is dependent on a number of factors such as the number of animals that are fed corn, its supply and price, the amount of supplemental ingredients added, and the supply and price of competing ingredients ( USDA

- ERS, 2011d )

. C orn forage, silage, grain, and refined corn feed products from currently cultivated GE herbicide

- resistant and conventional corn varieties are utilized by livestock producers.

I t is the responsibility of feed manufacturers to ensu re that the products they market are safe and properly labeled and f eed derived from GE corn must comply with all applicable legal and regulatory requirements, which in turn protect human health (see Subsection 2.5, Animal Feed)

. A ll applicants who wish t o commercialize a GE variety that will be included in the food supply complete a consultation with the FDA to identify and discuss relevant safety, nutritional, or other regulatory issues regarding the bioengineered food and submits a summary of its scient ific and regulatory assessment of the food to FDA ( US

- FDA, 2012b )

. The FDA evaluates the submission and responds to the developer by letter. Stine submitted their final food consultation regarding Maize Line HCEM485 in December 2010 which is pending review by the FDA. It will be posted on the FDA website Final Biotechnology Consultations http://www.fda.gov/Food/ Biotechnology/Submissions/ucm225108.htm when completed

. In addition, a biotechnology consultation of the EPSPS protein was completed by the FDA on the antecedent GA21 corn variety (BNF No. 000051) on February 10, 1998 ( US

- FDA, 1998a ) . No food safety issues were found by the FDA in their review of Monsanto’s safety and nutritional assessment of GA21 corn and the modified EPSPS protein (see the FDA website Final Biotechnology Consultations http://www.fda.gov/Food/Biotechnology/Submissions /ucm225108.htm )

. Agricultural production of existing commercially available glyphosate

- resistant corn varieties

u ses EPA

- registered pesticides , including glyphosate

. The interval between when corn is treated87 with glyphosate and the grain may be subsequently harvested is seven days ( Bradley et al., 2010 )

. The interval between post

- harvest application of glyphosate after corn grain has been harvested and when the corn vegetation may be harvested or used as feed varies with product labels, for example the Roundup Power Max® interval is seven days while the G lyphosate 41 Plus ® interval is eight weeks ( CropSmart, 2009 ; Monsanto, 2010 )

. Tolerances are the limits on the amount of pesticide that may remain on or in foods marketed in the U.S. that are established for every pesticide based on its potential risks to human health. The maximum tolerance level for glyphosate in field corn is 5.0 ppm for grain and is 6.0 ppm for forage (40 CFR §180.364).

4.6.2 Preferred Alternative: Animal Feed As described in Subsection 4.2.1, Acreage and Area of Corn Production, no change to the area or acreage of corn production is expected to occur as the result of extending a determination of nonregulated status to Maize Line HCEM485. Also, as described in Subsection 4.2.2, Agronomic Practices, the cultural requirements and agronomic practices for corn production that could impact the supply of corn

- b ased animal feed would not change under this alternative because agronomic and growth characteristics of Maize Line HCEM485 are similar to other commercially available glyphosate

- resistant corn. As described for the No Action Alternative, the amount of co rn that is used for feed is dependent on several factors, including price, supply, and the number of animals that are fed corn ( USDA

- ERS, 2011d )

. Because herbicide

- resistant corn is the majority of corn produced in the U.S. today, and most of that is glyphosate resistant ( USDA

- ERS, 2011a )

, Maize Line HCEM485 would likely replace other glyphosate

- resistant cultivars without impa ct ing the supply of corn for animal feed

. Stine has submitted compositional and nutritional characteristics of Maize Line HCEM485 grain and forage to APHIS ( Stine, 2011 ) . Samp les of Maize Line HCEM485 and its comparators that were sprayed with glyphosate were collected from six different field trial locations (four for grain samples and two for forage samples) and analyzed for comparable nutritional components in accordance wit h Organisation for Economic Co

- operation and Development (OECD) guidelines ( OECD, 2002 ) . Tested parameters include proximates (protein, fat, carbohydrates, fiber, ash, and moisture), minerals, amino acids, fatty a cids, vitamins, isoflavones, and antinutrients (i.e ., ferulic acid, phytic acid, trypsin inhibitor, raffinose, furfural, inositol, and ρ

coumaric acid) ( Stine, 2011 )

. Maize Li ne HCEM485 is similar in compositional and nutritional characteristics to other varieties of GE and non

- GE corn ( Stine, 2011 ; USDA

- APHIS, 2011b )

. A biotechnology consultation of the EPSPS protein that confers glyphosate resistance in the GA21 corn variety has previously been completed

. (See Subsection 4.5, Human Health) . Stine submitted a safety and nutritional assessment of food and feed derived from Maize Line HCEM485 to the FDA in December 2010 in support of the consultation proc ess with the FDA for the commercial distribution of Maize Line HCEM485 ( Stine, 2011 )

. Based on the above information and its similiarity to the antecedent GA21 corn, potential impacts on the safety of Maize Line HCEM485 is expected to be similar to the No Action Alternative.

As discussed above, label restrictions for glyphosate’s application to corn prohibits harvesting the grain prior to seven days after application and the in terval for harvesting or feeding the vegetation is dependent on the individual glyphosate product label. As discussed in Subsection 4.2.2, Agronomic Practices, the registered uses of glyphosate on Maize Line HCEM485 or other corn would not change as a res ult of the Preferred Alternative, nor would herbicide label88 restrictions for feeding corn after treatment. Similarly, n o change to the EPA

- established tolerances of glyphosate in treated corn intended for forage or grain harvested for animal feed that cou ld impact animal health would be required for the use of glyphosate on Maize Line HCEM485 .

Based on a review of field and laboratory data and scient ific literature provided by Stine ( 2011 )

, as well as safety data available on other glyphosate

- resistant corn in commercial production, APHIS has concluded that a determination of nonregulat ed status to Maize Line HCEM485 would not adverse ly impact the safety of animal fee d and animal health

. Overall impacts of the Preferred Alternative would be similar to the No Action Alternative.

4.7 Socioeconomic Impacts

4.7.1 Domestic Economic Environment

No Action Alternative: Domestic Economic Environment
Under the No Action Alternative, Maize Line HCEM485 corn would continue to be a regulated article under 7 CFR part 340, cultivated only in limited test fields. Farmers and other parties who are involved in production, handling, processing, or consumption of corn would not have access to Maize Line HCEM485 corn, but would have access to existing nonregulated herbicide

resistant, conventional, GE, and organic corn varieties. In terms of value, corn is the primary U.S. crop exceeding $66.7 billion in 2010 ( USDA

- NASS, 2011f ) , and it is expected corn would retain current planted acreage levels at least until 2020 ( USDA

- OCE, 2011 ) . Almost all of the U.S. corn supply (99.8% in 2010/11) comes from new annu al domestic production ( USDA

- ERS, 2011g ) . In the 2010/11 marketing year, less than half (42.8%) of domestic corn usage was for feed, while approximately 44.7% of domestic use was for the production of ethanol ( USDA

ERS, 2011g ) . T ota l operating costs for U.S. corn production were $275.58 per planted acre ( USDA

- ERS, 2011c ) . Corn is widely produced in the U.S. ( see Subsection 2.1.1, Acreage and Area of Corn Productio n , Figure 1 ). The most productive regions are the Heartland and Northern Crescent , and the two most profitable are the Heartland and Northern Great Plains ( USDA

- ERS, 2011c ) . As discussed in Subsection s 2.1.4, Organic Corn Production

, and 2.6.1, Domestic Economic Environment, organic corn production is a small portion of the U.S. corn market. The value of corn produced for grain or seed from organic

- certified farms in the U.S. in 2008 was nearly $111.4 million ( USDA

- NASS, 2010a )

. Most corn planted in the U.S. today are stacked GE varieties with both herbicide and insect resistance ( USDA

- ERS, 2011a ) . The widespread a doption of herbicide

- resistant corn has been attributed to the cost savings for production, among other non

- monetary benefits as described in Subsect ion 2.1.2, Agronomic Practices ( Duke and Powles, 2009 ; NRC, 2010 ; Green and Owen, 2011 ) . Of the herbicide

- resistant corn varieties on the market today, growers may choose from glyphosate, glufosinate, glyphosate stacked with immidazolinone resistance traits ( USDA

APHIS, 201 2 ) , and glufosinate ( Monsanto, 2011b )

. GE technology is patented and GE seeds are proprietary in the U.S. ( NRC, 2010 ) . The costs for GE seed are higher than that for conventional seed, as GE seed includes technology fees ( NRC, 2010 ) . The higher seed costs, however, may be offset by other premiums offered by companies, such as discounts for herbicides to use on the resistant crop, and reductions in crop insurance89 ( NRC, 2010 ) . As discusse d in Subsection 2.6.1, Domestic Economic Environment, e stimates of the economic benefits of herbicide

- resistant crops to farmers are limited ( NRC, 2010 ) , and studies that have been conducted have had mixed resu lts. Overall, the se studies indicate in the early years of the adoption, GE cultivars exerted downward pressure on crop prices while the earnings of adopting farmers increased, and barriers to market access f or GE crops reduced grower income ( NRC, 2010 )

. Farmers have recently broadened weed management to treat herbicide

- resistant weeds which may be impacting yields, leading to more variety in herbicide application and increased tillage, potentially incurring higher production costs. Weirich et al. ( 2011 ) , however, investigated the economic effect s of alternative glyphosate weed resistance management programs , finding that although they increased cost substantially, higher yields offset these costs s uch that no statistically significant decrease in net returns occurred

. Their study suggest s growers may be able to effectively respond to glyphosate resistance using weed BMPs without substantially affecting their returns.

As indicated in Subsection 2.1.1, Acreage and Area of Corn Production, the trend over the last several years in the U.S. has been to stack herbicide resistance with primarily insect

- resistant traits. Developers have recently sought approvals for corn vari eties that have multiple herbicide and insect resistance, as well as other value added traits ( USDA

- APHIS, 2012 ) . Herbicide

resistant

- only corn has consistently comprised appr oximately 22 to 23% of planted corn in the U.S. since 2007 ( USDA

- ERS, 2011a )

. T wo companies hold the licenses for the majority of herbic ide

- resistant corn in the U.S.: Monsanto patented glyphosate

- resistant corn technology and offers varieties in their Roundup Ready® corn lines, and Bayer CropScience licenses glufosinate

- resistant corn in their LibertyLink® corn lines. Growers have perce ived a lack of competition in the U.S. herbicide

- and insect

- resistant seed corn market based on substantial increases in the price of GE seed in the last several years ( Neuman, 2010 ) ; although, concentration of the U.S. seed market has been ongoing since passage of the Plant Variety Protection Act in the 1970s established proprietary rights for certain plant varieties ( Fernandez

Cornejo, 2004 )

. In 2010, corn seed comprised 30% of total per acre operating costs for farmers ( USDA

- ERS, 2011c )

. Indust ry has responded that the quality of seed offered has improved, and new GE traits have been added that lower costs associated with improved insect and weed control, among other production costs ( Neuman, 2010 )

.
Preferred Alternative: Domestic Economic Environment
Under the Preferred Alternative, f armers and other parties who are involved in the production, handling, processing, or consumption of corn would have access to Maize Line HCEM485.

Maize Line HCEM4 85 is similar in its composition, growth habits, and cultural requirements to the antecedent GA21, its comparators and other nonregulated glyphosate

- resistant corn ( Stine, 2011 ; USDA

- APHIS, 2011b )

. Since this new cultivar is glyphosate

- resis tant
, Maize Line HCEM485 would directly compete with the market share of other glyphosate

- resistant corn varieties. As discussed above, herbicide

- resistant corn dominates U.S. corn production, either as herbicide

- resistant

- only varieties or stacked with o ther traits; therefore, Maize Line HCEM485 would likely replace other glyphosate

- resistant corn cultivars without impacting corn acreage or production area that may affect domestic markets. As another glyphosate

- resistant corn cultivar in the market, nonr egulated Maize Line HCEM485 may increase competition, the extent of90 which is dependent upon growers finding value in it. As discussed above, growers may currently choose from glyphosate, glufosinate, and glyphosate stacked with immidazolinone resistance
t raits. It is reasonable to assume Maize Line HCEM485 may be stacked with other traits, similar to other glyphosate

- resistant corn cultivars. APHIS assumes that the technology fees for Maize Line HCEM485 seed would be similar to those charged by developer s for other GE crop varieties already in the marketplace.

Since Maize Line HCEM485 is similar in growth habits and cultural requirements to other nonregulated herbicide

- resistant, GE and non

- GE corn varieties ( Stine, 2011 ) , no changes to agronomic inputs or practices would be anticipated that may impact on

- farm costs for corn producers or the U.S. domestic corn market. As discussed above, farmers are broadening their weed control tactics in response to developing herbicide

- resistant weeds, including glyphosate

resistant weeds (see Subsection 2.3.2, Plants Communities, Table 2). These BMPs increase costs of production; h owever, the costs appear to be offset by increases in yields, having little negative impact to net returns ( Weirich et al., 2011 ) . As discussed above, Maize Line HCEM485 is similar to and expected to replace other glyphosate

- resistant cultivars, and would, therefore, have similar impacts on the development of herbicide

- resistant weeds and weed management practices

as the No Action Alternative.

As discussed under the No Action Alternative, the orga nic corn market serves a smaller consumer niche for corn in the U.S. corn market. Because of Maize Line HCEM485’s similarity to other currently available GE corn varities in its reproductive characteristics, it is expected that impacts on organic corn pro duction would be similar to the No Action Alternative. U.S. organic producers would continue to to be able to meet organic certification requirements as outlined in Subsection 2.1.4, Organic Corn Production, by implementing standard practices to preserve the identity of their organic corn crop.

Based upon the above, an extension of a determination of nonregulated status to Maize Line HCEM485 would have potential domestic economic impacts no different than those currently observed under the No Action Alter native

.

4.7.2 Trade Economic Environment

No Action Alternative: Trade Economic Environment Under the No Action Alternative, Maize Line HCEM485 would continue to be a regulated article

. Farmers , processors, and consumers in the U.S. would not have access to M aize Line HCEM485, but do have access to existing nonregulated herbicide

- resistant and non

- GE corn varieties, as do the major U.S. corn export competitors.

The U.S. is the leading exporter of corn in the world market (see Subsection 2.6.2, Trade Economic Environment, Figure 9), while other important exporters are Argentina, Brazil, and Ukraine. In the 2010/2011 marketing year (August to September), the U.S. exported more than half of the world’s corn with Japan, Mexico, and South Korea the major importer s ( USDA

- FAS, 2011a ) . In 2010, corn exports were worth approximately $9.1 billion ( USDA

- ERS, 2010c )

. U.S. c orn supply, t he value of the U.S. dollar and other currencies, oil prices, U.S. and international agricultural policy, the U.S. and international biofuels sector, livestock and meat trade, prices, and population growth are all factors affecting where and h ow much of U.S. corn is91 exported ( USDA

- ERS, 2009 ; USDA

- OCE, 2011 ) . In addition, consumer perception of GE crop production and products derived from GE crops may present barriers to trade. Over the past decade, U.S. corn export share has eroded as exports have remained relatively stable while global exports have increased by almost 20% (See Subsection 2.6.2, T rade Economic Environment, Figure 9). U.S. share of world corn production has declined as well, even as total world production increased (Figure 10). This is attributed to greater domestic use of U.S. corn, smaller corn crops, and increased competition f rom other major corn exporters such as Argentina, Brazil

, and Ukraine ( USDA

- FAS, 2011a ) , countries with increasing GE herbicide

and insect

- resistant corn production acreage ( Brookes and Barfoot, 2011 )

. Farmers in the U.S. and abroad have begun to utiliz e BMPs to control glyphosate or other herbicide

- resistant weeds, but these BMPs have not necessarily increased costs ( Weirich et al., 2011 ) such that the competitiveness of U.S. corn and trade econo mic environment would be affected. Increasing herbicide weed resistance is also occuring in other countries producing herbicide

- resistant crops, including U.S. corn export competitors (for example, Argentina and Brazil ( Heap, 2011 ) ) that would likely incur increases in production cost to mitigate the incidence of glyphosate

- resistant weeds, similar to the U.S. experience.

Stine has submited applications for regulatory approval of Maize Line HCEM485 to Canada for cultivation and use as food and feed. In the 2010/2011 market year, Canada imported
ap proximately 58.7% of the amount of corn they exported, and imported more corn than they exported in the prior three years ( USDA

- FAS, 2012 ) . Canada is n ot a major corn export competitor of the U.S.; in the 2010/2011 market year, Canadian corn exports equated to only about 3.7% of the U.S. corn exports that year ( USDA

- FAS, 2012 )

.
Preferred Alternative: Trade Economic Environment Maize Line HCEM485 is compositionally and agronomically similar to the antecedent GA21, its comparators and other nonregulated glyphosate

- resistant corn ( Stine, 2011 ; U SDA

- APHIS, 2011b )

. As such, it is not expected to affect the seed, feed, or food trade any differently than other nonregulated glyphosate

- resistant corn varieties (see Subsections 4.7.1, Domestic Economic Environment). As another glyphosate

- resistant corn cultivar, Maize Line HCEM485 is expected to replace other glyphosate

- resistant cultivars to the extent growers find value. Approval of the extension request for a determination of nonregulated status of Maize Line HCEM 485 would, therefore, not likely increase the U.S. supply of corn that may affect trade . As discussed above, other countries are increasing their production of herbicide

- resistant corn, including glyphosate

- resistant cultivars, and are becoming significan t export competitors to U.S. corn trade. Because the U.S. and other countries already have access to other glyphosate

resistant corn cultivars, and Maize Line HCEM485 presents another option of glyphosate

resistant corn, its availability only to U.S. prod ucers would not likely significantly impact the economic trade environment. As noted above, Stine has submitted applications to Canada for import clearance and production approval of Maize Line HCEM485 ( Potter, 2011a, personal communi cation ) ; however, Canada is not a major U.S. corn export competitor

. As discussed in Subsection 4.4.2, Plants Communities, the cultivation of Maize Line HCEM485 would not change the development of glyphosate

- resistant weeds nor affect the BMPs to cont rol glyphosate

- resistant weeds any differently than other nonregulated glyphosate

- resistant corn. These BMPs would not necessarily increase costs such that the competitiveness of U.S. corn and92 trade economic environment would be affected , as the increased costs may be offset by increased yields ( Weirich et al., 2011 )

. As discussed under the No Action Alternative, g lobal corn export markets respond to many factors , including consumer perception of GE crops and derived products. As another glyphosate

- resistant corn cultivar , the availability of Maize Line HCEM485 for production in the U.S. would not likely affect foreign consumer perception of GE corn products or those global forces shaping the U.S. corn trade economic environment.

Impacts to the trade economic environment from an extension of a determination of nonregulated status to Maize Line HCEM485 would be similar to the No Action Alternative.93 

### 5 CUMULATIVE IMPACTS

5.1 Assumptions Used for Cumulative Impacts Analysis Cumulative effects have been analyzed for each environmental issue assessed in Section 4

, Environmental Consequences

. T he cumulative effects analysis is focused on the incremental impacts of the Preferred Alternative taken in c onsideration with related activities including past, present, and reasonably foreseeable future actions. Certain aspects of this product and its cultivation would be no different between the alternatives; those instances are described below. In this anal ysis, if there are no direct or indirect impacts identified for a resource area, then APHIS assumes there can be no cumulative impacts. Where it is not possi b le to quantify impacts, APHIS provides a qualitative assessment of potential cumulative impacts. APHIS considered the potential for Maize Line HCEM485 to extend the range of corn production and affect the conversion of land to agricultural purposes. Stine’s studies demonstrate Maize Line HCEM485 is similar in its growth habit, agronomic properties, disease susceptibility, and composition to its antecedent GA21, its control group cultivars, other nonregulated varieties of glyphosate

- resistant corn, and other GE and non

- GE corn ( Stine, 2011 ; USDA

- APHIS, 2011b ) . As such, its cultural requ irements would be no different than those of other corn or provided by the areas in which corn is currently cultivated. As presented in Subsection 2.1.1, Acreage and Area of Corn Production, the majority of corn cultivated in the U.S. is herbicide

- resista nt, most of which is glyphosate

- resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) . Nonregulated Maize Line HCEM485 could replace other commercially available glyphosate

- resistant corn varieties without requiring cultivation of new, natural lands. As such, land use changes associated with extending a determination of nonregulated status to Maize Line HCEM485 are not expected to be any different than those associated with the cultivation of other corn cultivars. Accordingly,

a lthough the preferred alternative would allow for new plantings of Maize Line HCEM485 to occur anywhere in the U.S., APHIS will focus the analysis of cumulative impacts to the areas in the U.S. that currently support corn production.

Potential reasonably foreseeable cumulative effects are analyzed under the assumption that farmers have used in the past and would continue to use reasonable, commonly accepted BMPs for their chosen system and vari eties during agricultural corn production. APHIS recognizes, however, that not all farmers will use such BMPs; thus, the cumulative impact analysis will also make the assumption that not all farmers would do so. Stine has indicated it is not necessary to change the use pattern of glyphosate on the glyphosate

- resistant Maize Line HCEM485 variety; hence, APHIS will use current glyphosate labels as the basis for its potential past, present, and reasonably foreseeable impacts from the use of and exposure to g lyphosate assessment. APHIS assumes growers of Maize Line HCEM485 will adhere to the EPA

- registered uses and EPA

approved labels for all pesticides applied to this crop.

A s part of the cumulative impacts analysis, APHIS will assume that Maize Line HCEM485 would likely be combined with commercially available herbicide

- and insect

- resistant varieties of corn as a reasonably foreseeable future action. Crop varieties that contain more than one GE trait, known as a “stacked” hybrid, are currently found in agricultural production and in the marketplace. Maize Line HCEM485 would likely be combined with non

- GE and GE corn varieties through traditional breeding techniques ( Potter, 2011b ) . Stacking of nonregulated GE94 crop varieties using traditional breedi ng techniques is common practice and is not regulated by APHIS. Stacking c ould involve combining Maize Line HCEM485 with other corn varieties having GE traits such as herbicide, insect, and/or drought resistance, which are no longer subject to the regulatory requirements of 7 CFR part 340 or the plant pest provisions of the Plant Protection Act. Such stacked variet ies could provide growers with several option s such as combin ing several herbicides with different modes of action for control of weeds

.
5.2 Cumulative Effects

5.2.1 Past and Present Actions In the preceding analysis, the potential impacts from an extension of a determination of nonregulated status to Maize Line HCEM485 were assessed. The agronomic characteristics evaluated for Maize Line HCEM485 encompassed the entire life cycle of the corn plant and included germination, seedling emergence, growth habit, vegetative vigor, days to pollen shed, days to maturity, and yield parameters. The compositional analysis included the major constituents (car bohydrates, protein, fat, and ash), minerals, vitamins, amino acids, fatty acids, secondary metabolites, antinutrients, phytosterols, and nutritional impact. Maize Line HCEM485 is agronomically and compositionally similar to its previously nonregulated

an tecedent GA21, as well as other GE and non

- GE corn varieties ( Stine, 2011 ; USDA

- APHIS, 2011b )

. As a result, the potential impacts under the Preferred Alternative for all the resource areas analyzed would be the same as those described for th e No Action Alternative.

T he Preferred Alternative is not expected to directly cause a measurable change in agricultural
acreage or area devoted to conventional or GE corn cultivation or corn grown for seed in the U.S. (see Subsection s 4.2.1, A creage and Area of Corn Production

, and 4.2.3, Corn Seed Production). The majority of corn grown in the U.S. is GE and herbicide resistant ( USDA

- ERS, 2011a )

. L ong

- term projections show planted corn main taining between approximately 90 and 92 million acres a year through 2020 , about the same as the 92.3 million acres planted to corn in 2011 ( USDA

- NASS, 2011b ; USDA

- OCE, 2011 )

. Because Maize Line HCEM485 is another glyphosate

- resistant corn culti var agronomically and compositionally similar to other commercially available glyphosate

- resistant corn cultivars, and herbicide

- resistant co rn is currently approximately 72% of all planted corn and most U.S. corn is glyphosate

- resistant , it is expected Ma ize Line HCEM485 would replace other similar cultivars without expanding the acreage or area of corn production. Additionally, no anticipated changes to the availability of GE and non

- GE corn varieties on the market are anticipated

. Based upon recent tren ds, adding GE varieties to the market is not related to the ability of organic production systems to maintain their market share (see Subsection 4.2.4, Organic Corn Production). As described above, the majority of corn in 2011 was GE and herbicide resista nt ( USDA

- ERS, 2011a )

. Since 1994, 27 GE corn events or lines have been determined by APHIS to be no longer subject to the regulatory req uirements of 7 CFR part 340 or the plant pest provisions of the Plant Protection Act ( USDA

- APHIS, 2012 ) . U.S. o rganic corn production
acreage grew 83% from 32,650 acres in 199 5 to 194,637 acres in 2008, and remained at about 0.2% of total U.S. corn acreage from 2 0 05 to 2008 ( USDA

- ERS, 2010a )

. Availability of another GE glyphosate

- resistant corn variety

, such as Maize Line HCEM485 under the Preferred Alternative

, is not expected to impact the organic production of corn any differently than other GE varieties currently being grown

.95 E xtending a determination of nonregulated status to Maize Line HCEM485 is not expected to result in changes to current corn cropping practices. Studies conducted by Stine demonstrate that, in terms of agronomic characteristics and cultivation practices, Maize Line HC EM485 is similar to other corn varieties currently grown ( Stine, 2011 ; USDA

- APHIS, 2011b )

. Consequently, no changes to current corn cropping practices such as tillage, crop rotation, or agricultural inputs associated with the adoption of Mai ze Line HCEM485 are expected (see Subsection 4.2.2, Agronomic Practices).

E xtending a determination of nonregulated status to Maize Line HCEM485 would have the same impacts to water, soil, air quality, and climate change as that of nonregulated glyphosat e

- resistant corn varieties presently available

. Agronomic practices that have the potential to impact soil, water and air quality, and climate change such as tillage, agricultural inputs (fertilizers and pesticides), and irrigation would not change becaus e Maize Line HCEM485 is agronomically similar to other glyphosate

- resistant corn and other GE and non

- GE corn. Other practices that benefit these resources, such as contouring, use of cover crops to limit the time soil is exposed to wind and rain

, crop ro tation, and windbreaks would also be the same. Because of its similarity to other nonregulated glyphosate

- resistant corn and the fact that most cultivated corn in the U.S. is glyphosate resistant, adoption of Maize Line HCEM485 is expected to replace othe r similar cultivars without changing the acreage or area of corn production that could impact water, soil, air quality, and climate change.

The impacts of the Preferred Alternative to animal and plant s communities, microorganisms, and biodiversity would be no different than that experienced under the No Action Alternative. Maize Line HCEM485 is both agronomically and compositionally similar to its antecedent GA21 and other nonregulated glyphosate

- resistant corn ; thus

, it would not require any different agronomic practices to cultivate, and does not represent a safety or increased weediness risk any differently than other currently available glyphosate

- resistant corn. Availability of Maize Line HCEM485 would not impact the development of glyphosate

- resis tant weeds or the trend to broaden weed management tactics to affect control over herbicide

- resistant weeds, as it is expected to replace other glyphosate

- resistant cultivars without expanding the acreage or area of corn production or changing the applicat ion rates of glyphosate.

The potential impact s from the use of herbicides under the Preferred Alternative would be the same as those of the No Action Alternative. The methods of application and use rate for herbicides to be applied to Maize Line HCEM485 would not change from those already approved for use on other nonregulated glyphosate

- resistant corn cultivars. The total amount of the mix of herbicides that c ould be applied to Maize Line HCEM485 would be limited by the authorized EPA

- registered uses and the total application amount allowed by law. Glyphosate and other pesticides are registered by the EPA under FIFRA and are reviewed and reregistered every 15 years to assess potential toxicity and environmental impact. In order to be registered for use, a pesticide must be able to be used without unreasonable risks to people or the environment. Pesticide residue tolerances for glyphosate and other herbicides and pesticides are listed in 40 CFR §180.364 and include acceptable concentr ations for corn grain and f orage

. In addition, the safety precautions and EPA

- labeled instructions for the application of pesticides would not change under the Preferred Alternative, ensur ing continued human health and worker safety.96 T here are no differ ences in the potential for gene flow and weediness under the Preferred Action Alternative. O nly limited populations of sexually compatible relatives of domesticated corn are found within the U.S. ; hence

, there is not a significant risk of gene movement be tween corn and its wild or weedy maize relatives ( US

- EPA, 2011b ) . Additionally, corn seed does not possess the characteristics for efficient seed

- mediated gene flow, does not establish wild or feral populat ions

, and is dependent on human cultivation for survival ( OECD, 2003 ; Doebley, 2004 )

. Maize Line HCE M485 is similar to other glyphosate

- resistant corn varieties . The risk of gene flow and weediness of Maize Line HCEM485 is no greater than that of other nonregulated glyphosate

- resistant corn varieties.

F ood and feed derived from GE corn must be in compli ance with all applicable legal and regulatory requirements and may undergo a voluntary consultation process with the FDA prior to release onto the market to identify and discuss relevant safety, nutritional, or other regulatory issues regarding the bioengi neered food

. Maize Line HCEM485 is expected to have no toxic effect to human health or livestock . Stine submitted a safety and nutritional assessment of food and feed derived from Maize Line HCEM485 to the FDA in December 2010 and their decision is pending

. It will be posted on the FDA website Final Biotechnology Consultations http://www.fda.gov/Food /Biotechnology/Submissions/ucm225108.htm when completed . A food saf ety evaluation of the EPSPS protein for the GA21 corn variety was completed by the FDA (BNF No. 000051) on February 10, 1998

, which found no safety concerns ( US

- FDA, 1998a )

. In addition, t he potential environmental im pacts from the cultivation of glyphosate

resistant corn varieties ha ve been thoroughly evaluated by APHIS (see http://www.aphis.usda.gov/biotechnology /not_reg.html ). APHIS has determ ined there would be

no significant risk to biological resources from the presence of the EPSPS protein that confers glyphosate resistance in Maize Line HCEM485 , which is the same protein found in nonregulated glyphosate

- resistant corn cultivars in commerce today

. No change in food and feed safety is expected to occur under the Preferred A lternative.

S inceMaize Line HCEM485 is glyphosate

- resistant

, it would directly compete with the market share of other glyp hosate

- resistant corn varieties . B ased on its si milarity to other nonregulated corn cultivars, Maize Line HCEM485 would likely replace other glyphosate

- resistant corn cultivars without impacting corn acreage or production area that may affect domestic markets. Additionally, since Maize Line HCEM485 is agronomically and compositionally similar to other commercially available corn, there would be no changes to agronomic inputs or practices that may impact on

- farm costs for corn producers or the domestic economic environment, including the organic corn market. As mentioned above, Maize Line HCEM485 would not likely impact the development or treatment of herbicide

- resistant weeds or their associated costs in crop losses or methods to affect control. No changes to t he domestic economic environment are expected to occur under the Preferred Alternative.

Similarly, Maize Line HCEM485 is not expected to affect the seed, feed, or food trade any differently than other nonregulated glyphosate

- resistant corn varieties. O th er countries already have access to and are increasing their production of glyphosate

- resistant corn varieties and are becoming significant export competitors to U.S. corn trade. Maize Line HCEM485 is compositionally and agronomically similar to other gly phosate

- resistant cultivars in the marketplace. In summary, the potential cumulative effects regarding past and present actions97 combined with the Preferred Alternative have been analyzed

, and no changes from the current baseline under the No Action Altern ative would occur.

5.2.2 Reasonably Foreseeable Actions If a determination of nonregulated status is extended to Maize Line HCEM485, the cultivar would likely be combined (stacked) with non

- GE and GE corn varieties using traditional breeding techniques. Stack ing of nonregulated GE crop varieties using traditional breeding techniques is common practice. As of 2011, c orn with only herbicide

- resistant traits comprise d 23% of the U.S. corn grown, but a greater proportion was stacked with both herbicide

- and insec t

- resistant traits (49%) ( USDA

- ERS, 2011a )

. Potential future stacking of Maize Line HCEM485 might include development of hybrids usin g other currently available nonregulated corn varieties expressing resistance to other herbicides, or resistance to select insect pests by stacking with one of the biopesticidal Bt genes. For example, a new cultivar combining glyphosate and glufosinate re sistance with insect resistance is available for the 2012 planting season ( Monsanto, 2011b ; Monsanto, 2011a )

. APHIS regulations under 7 CFR p art 340 do not provide for Agency oversight of stacked varieties combining GE varieties that are no longer regulated under 7 CFR 340 or the plant pest provisions of the Plant Protection Act

, unless it can be positively shown that such stacked varieties are likely to pose a plant pest risk. Whether Maize Line HCEM485 would be stacked with any particular nonregulated GE or

non

- GE variety is unknown , as company plans and market demands play a significant role in those business decisions

. In addition, t he adoption level of Maize Line HCEM485 would depend on the extent producers value the traits offered by stacked versions of Maize Line HCEM485 over other available stacked corn varieties.

The potential future development and cultivation of Maize Line HCEM485 glyphosate

- resistant corn stacked with other herbicide

- resistant, insect

- resistant, and/ or other GE traits is not likely to change the area or acreage of corn production. Despite the availability of these cultivars, corn production acreage is expected to remain relatively stable until 2020 ( USDA

- OCE, 2011 )

.
If Maize Line HCEM485 is stacked with other transgenic herbicide

- resistant traits, depending on the extent of its adoption, it may contribute to sustaining conservation tillage in U.S. corn production that both directly and indirectly impacts water, soil, and air quality . Stackin g Maize Line HCEM485 with other herbicide

- resistant traits would enable use of a combination of different herbicide modes of action to be applied to corn

, an approach recommended by Dill et al. ( 2008 ) to preserve the utility of glyphosate resistance technology. This approach has been proposed to mitigate the future development of herbicide

- resistant weeds ( Duke and Powles, 2009 )

, which may reduce the n eed for tillage for weed management ( Owen, 2011 )

, thus

, benefiting soil , water
, and air quality. This c ould also reduce GHG emissions from soil and emission s from associated fuel

- burning equipment that can contribute to climate change

. Reduced tillage improves habitat value through increased water quality, availability of waste grain, retention of cover in fields, and increased populations of invertebrates ( Brady, 2007 ; Sharpe, 2010 )

. Similarly, stacking multiple herbicide resistan ce into a single cultivar may sustain conservation tillage rates that promote greater plant diversity in fields while retaining crop yields which subsequently would improve soil quality and reduce soil erosion, sustaining both crop and non

- crop plants.98 S imilar to other stacked varities of herbicide resistant corn, Maize Line HCEM485 stacked with other herbicide

- resistant traits would , however, narrow the options for herbicidal management of volunteer corn . In crop rotations where soybean or some other br oadleaf cultivar is rotated with corn, an approved grass herbicide could be used to control volunteer corn ( Sandell et al., 2011 )

. In contin uous corn cropping systems with the same herbicide resistances

, control becomes more complicated and must be accomplished through other means such as tillage ( Sandell et al., 2011 )

. Loux et al. ( 2011 ) recommend careful rotation planning to eliminate this potential problem. Maize Line HCEM485 stacked with insect

- resistant traits would be no more likely to exhibit increased weediness characteristic s than other currently available glyphosate

- and insect

- resistant stacked transgenic corn cultivars. Similarly, stacked Maize Line HCEM485 is not expected to exhibit any gene flow characteristics different from the parent transformation events ( i.e., crop lines) that would pose a plant pest risk.

The total amount of the mix of pesticides that may be applied to stacked varieties of Maize Line HCEM485 would be limited by the total application amount authorized by law, and would be no different than the app lication rate already approved for use on other stacked glyphosate

- resistant corn cultivars. When used consistent ly with the label, the potential risks from the application of pesticides to stacked Maize Line HCEM485 varieties to physical and biological r esources, as well as human health and safety, would not increase. In addition, there would be no changes to currently authorized pesticide tolerance levels for stacked varieties of Maize Line HCEM485.

Maize Line HCEM485 would likely be stacked with inse ct

- resistant corn varieties that express the Bt endotoxin. In accordance with 40 CFR part 174, all the currently nonregulated insect

resistant corn varieties that contain the Bt endotoxin are exempt from the requirement of tolerance in feed commodities. Based on studies undertaken to assess the potential impacts of the Bt endotoxin to the monarch and other non

- target butterflies, as well as factors such as the location of corn production and the characteristics of corn pollen, the EPA determined that the potential risk to non

- target butterflies is low ( US

- EPA, 2002 ) . Maize Line HCEM485 stacked with insect

- resistant (Bt) traits would likely replace other currently nonregulated stacked transgenic corn varieties with herbicide and insect resistance. The adoption of stacked Maize Line HCEM485 would be contingent on the extent growers see value in the traits expressed in comparison to other commercially available corn cultivars with similar herbicide

- and insect

resistant traits.

No cumulative impacts on biological resources, human health

, or animal feed are anticipated from the stacking of Maize Line HCEM485 with additional GE traits

. F ood and feed derived from GE corn must be in compliance with all applicable legal and regulatory requirements and may undergo a voluntary con sultation process with the FDA prior to release onto the market. All varieties of GE corn with which Maize Line HCEM485 may be stacked with would have undergone, or are expected to undergo, this process to ensure their safety as food and feed products.

C o rn varieties with single and multiple herbicide resistance or insect resistance are already widely available

, representing almost 72% of U.S. corn acreage in 2011

. While the adoption of herbicide

- resistant

- only corn has remained relatively level and the production of insect

- resistant

only corn has decreased since 2007, the adoption of stacked varieties that confer resistance to herbicides and insects has steadily increased from 1% of planted corn acres in 2000 to 49% in99 2011 ( USDA

- ERS, 2011a )

. As such, i t is expected that Maize Line HCEM485 corn would likely be stacked with insect

- resistant traits and would have impacts similar to other s uch stacked corn cultivars already on the market. Agronomic practices

, including inputs for production of Maize Line HCEM485 stacked with insect resistance

, would be no different than those needed to cultivate other commercially available corn with the sa me resistances ; thus

, changes to on

- farm costs for corn producers or to the U.S. domestic corn market would be unlikely. Maize Line HCEM485 may also be stacked with other nonregulated GE traits; however, predicting these potential combinations would be sp eculative. Overall, i t is unlikely that any cumulative impact to the domestic economic environment would result from a stacked product consisting of Maize Line HCEM485 and other readily

- available GE traits.

U.S. corn exports have remained relatively sta ble over the last decade, a period in which other corn varieties with stacked glyphosate and other traits have been brought to market. Global export markets respond to many factors and are unlikely to change with the commercial availability of another gly phosate

- resistant corn cultivar such as Maize Line HCEM485 alone, or stacked with other currently available traits.

In summary, the potential for impacts as a result of Maize Line HCEM485 alone or stacked with other nonregulated GE or non

- GE corn varieties would not result in any changes to the resources areas when compared to the No Action Alternative. No cumulative effects are expected from an extension of a determination of nonregulated status to Maize Line HCEM485

, when taken in consideration with rela ted activities, including past, present, and reasonably foreseeable future actions

.1 00 

### 6 THREATENED AND ENDAN GERED SPECIES

Congress passed the ESA to prevent extinctions facing many species of fish, wildlife and plants. The purpose of the ESA is to conserve endangered and threatened species and the ecosystems on which they depend as key components of America’s heritage. To i mplement the ESA, the U.S. Fish and Wildlife Service (USFWS) works in cooperation with the National Marine Fisheries Service (NMFS), other Federal, State, and local agencies, Tribes, non

- governmental organizations, and private citizens. Before a plant or animal species can receive the prot ection provided by the ESA, it must first be added to the Federal list of threatened and endangered wildlife and plants.

A species is added to the list when the USFWS and/or NMFS determined it to be endangered or threatened because of any of the following factors:

• The present or threatened destruction, modification, or curtailment of its habitat or range;

• Overutilization for commercial, recreational, scientific, or educational purposes;

• Disease or predation;

• The inadequacy of existing regulatory mechanisms; and

• The natural or manmade factors affecting its survival.

In accordance with the ESA, o nce an animal or plant is added to the list, protective measures apply to the species and its habitat. These measures include protection from adverse effects of Feder al activities.

Section 7 (a)(2) of the ESA requires that a Federal agency, in consultation with the USFWS or NMFS, ensure s that any action the agency authorizes, funds, or carries out is not likely to jeopardize the continued existence of a listed speci es or result in the destruction or adverse modification of designated critical habitat. It is the responsibility of the Federal agency taking the action to assess the effects of the agency’s action and to consult with the USFWS or NMFS if it is determined that the action “may affect” listed species or critical habitat. To facilitate APHIS ’ ESA consultation process, the agency met with the USFWS from 1999 to 2003 to discuss factors relevant to APHIS’ regulatory authority and effects analysis for petitions for nonregulated status, and developed a process for conducting an effects determination consistent with the Plant Protection Act of 2000 ( t itle IV of Public Law 106

- 224). APHIS uses this process to help fulfill its obligati ons and responsibilities under S ection 7 of the ESA for biotechnology regulatory actions.

APHIS ’ regulatory authority over GE organisms under the P lant Protection Act is limited to those GE organisms for which it has reason to believe might be a plant pest or those for which APHIS does not have sufficient information to determine that the GE organism is unlikely to pose a plant pest risk ( T itle 7 , part 340.1 of the C FR). APHIS does not have authority to regulate the use of any herbicide, including glyphosate. After completing a plant p est risk analysis, if APHIS determines that Maize Line HCEM485 does not pose a plant pest risk, then Maize Line HCEM485 would no longer be subject to the plant pest provisions of the P lant Protection Act or to the regulatory requirements of 7 CFR part 340 and, therefore, APHIS must approve the extension request for a determination of nonregulated status. As part of its EA analysis, APHIS is analyzing the potential effects of Maize Line HCEM485 on the environment, including any101 potential effects to threate ned and endangered species ( TES ) and critical habitat. As part of th is
process, APHIS thoroughly reviews GE product information and data related to the organism (generally a plant species, but may also be other GE organisms). For each transgene(s)/transgenic plant, APHIS considers the following information, data, and questions:

• A review of the biology, taxonomy, and weediness potential of the crop plant and its sexually compatible relatives;

• Characterization of each transgene with respe ct to its structure and function and the nature of the organism from which it was obtained;

• A determination of where the new transgene and its products (if any) are produced in the plant and their quantity;

• A review of the agronomic performance of the plan t including disease and pest susceptibilities, weediness potential, and agronomic and environmental impact;

• Determination of the concentrations of known plant toxicants (if any are known in the plant); and

• Analysis to determine if the transgenic plant is s exually compatible with any TES or a host of any TES.

• Any other information that may inform the potential for an organism to pose a plant pest risk.

In following this review process, APHIS has evaluated the potential effects that approving an extension re quest for a determination of nonregulated status to Maize Line HCEM485 would have on federally

- listed TES, proposed species, critical habitat, and proposed critical habitat occurring within the 49 corn

- producing U.S. states and Puerto Rico. APHIS has revi ewed USFWS

- listed and proposed TES species for each state in which corn is commercially produced using the Environmental Conservation Online System (ECOS) (Accessed May 1 7 , 2012 from http://ecos.fws.gov/tess_ public ). Appendix A lists TES found in 49 corn

- producing U.S. states and Puerto Rico . Prior to this review, APHIS considered the potential for Maize Line HCEM485 to extend the range of corn production and affect the conversion of land to agricultural pur poses. Stine’s studies demonstrate Maize Line HCEM485 is similar in its growth habit, agronomic properties, disease susceptibility, and composition to its antecedent GA21, its control group cultivars, other nonregulated varieties of glyphosate

- resistant c orn, and other GE and non

- GE

corn ( Stine, 2011 ; USDA

- APHIS, 2011b ) . As such, its cultural requirements would be no different than those of other corn or provided by the areas in which corn is currently cultivated. As presented in Subs ect ion 2.1.1, Acreage and Area of Corn Production, t he majority of corn cultivated in the U.S. is herbicide

- resistant, most of which is glyphosate

- resistant ( Duke and Powles, 2009 ; USDA

- ERS, 2011a ) . Nonregulated Maize Line HCEM485 could replace other commercially available glyphosate

- resistant corn varieties without requiring cultivation of new, natural lands. As such, land use changes that could decrease TES habitat from an extension of a determination of nonregulated status to Maize Line HCEM485 are not expected to be any different than th ose associated with the cultivation of other corn cultivars. Accordingly, this analysis focuses on potential TES impacts where corn is currently grown.102 6.1 Potential Effects of Maize Line HCEM485 on TES This section considers the potential effects of the interaction of TES and Maize Line HCEM485, including: (1) its potential as a host for TES species; (2) potential gene flow to TES; (3) consumption effects of Maize Line HCEM485 seeds and vegetation; and, (4) potential non

- target impacts to TES, th eir habitat, and critical habitat from glyphosate use associated with the production of Maize Line HCEM485.

A review of the listed and proposed TES indicates no members of the corn genus Zea serve as a host plant for any F ederally

- protected species. There are also no listed or proposed TES plant species that are sexually compatible or could cross

- pollinate with the Zea genus in the U.S. As discussed above in the analysis of gene flow and weediness, commercially grown corn varieties in the U.S. are not con sidered weeds because corn does not possess characteristics to easily disperse and survive without human intervention ( OECD, 2003 ) . As presented in Subsections 4.4.2, Plants Communities, and 4.4.3, Gene Flow and Weediness, the potential for gene flow between Maize Line HCEM485 and sexually compatible wild teosinte relatives is low. W hile corn and various teosinte species are culturally a nd biologically similar, and gene exchange between these groups has been documented at low frequencies in Mexico, there has been no evidence of successful weedy species developing ( US

- EPA, 2011b ) . Based on the agronomic studies conducted by Stine and verified by APHIS, extending determination of nonregulated status to Maize Line HCEM485 does not present a plant pest risk, a risk of increased potential for weediness, nor an increased risk of gene flow, when compared to other currently cultivated corn varieties ( USDA

- APHIS, 2011b )

. Stine has presented information on the animal feed safety characteristics of Maize Line HCEM485 that could impact wildlife that may use cornfields as a food source, consu ming the plant or insects that live on the plants. Few TES are likely to use cornfields because they do not provide suitable habitat; however, some species may visit agricultural fields for incidental feeding. Midwestern TES species that occasionally fee d in farmed sites include: whooping crane ( Grus americana ), sandhill crane ( Grus canadensis pulla ), piping plover ( Charadrius melodus ), and interior least tern ( Sterna antillarum ) ( USFWS, 2011a ) . These and other bird species may visit cornfields during migratory periods

, but would not be present during normal farming operations ( Krapu et al., 2004 ; USFWS, 2011a ) . The Delmarva fox squirrel ( Sciurus niger cinereus ), which inhabits mature forests of mixed hardwood s and pines, may be found adjacent to agricultural areas of the Delmarva Peninsula ( USFWS, 2011b ) . The Delmarva fox squirrel feeds primarily on acorns, nuts, and pine seeds, but also utilizes corn in adjacent agr icultural fields ( USFWS, 2011b ) . The Louisiana black bear ( Ursus americanus luteolus ), occurring in Louisiana, Mississippi, and Texas ( USFWS, 2011c ) , may occasionally forage on corn ( Mississippi State University, No Date )

. Maize Line HCEM485 presents minimal risk to TES consuming this crop. As discussed in Subsection 4.6, Animal Feed, there is no difference in the composition and nutritional qu ality of Maize Line HCEM485 compared with conventional corn ( Stine, 2011 ) ; no expected hazards are associated with its consumption. The FDA has previously evaluated the safety of GE corn cultivars containing the EPSPS protein, which included toxicity and allergenicity assessments, finding no safety concern ( US

- FDA, 1998a ) . Pending results of the final biotechnology103 consultation with the FD A, effects on TES consuming Maize Line HCEM485 would be unlikely, regardless of exposure.

After reviewing the possible effects of allowing the unregulated environmental release of Maize Line HCEM485, APHIS has not identified any stressor that could affect the reproduction, numbers, or distribution of a listed TES or species proposed for listing. As a result, a detailed exposure analysis for individual species is not necessary. APHIS also considered the potential effect of extending a determination of nonr egulated status to Maize Line HCEM485 on designated critical habitat or habitat proposed for designation, and could identify no differences from effects that would occur from the production of other corn varieties. Corn is not considered a particularly co mpetitive plant species and has been selected for domestication and cultivation under conditions not normally found in natural settings ( US

- EPA, 2011b ) . Corn is not sexually compatible with, or serves as a host species for, any listed species or species proposed for listing. Consumption of Maize Line HCEM485 by any listed species or species proposed for listing would not result in a toxic or allergic reaction. Based on these factors, APHIS has concluded th at extending a determination of nonregulated status t o Maize Line HCEM485 and the corresponding environmental release of this corn variety would have no effect on listed species or species proposed for listing, and would not affect designated habitat or ha bitat proposed for designation. Because of this “no effect” determination, consultation under Section 7(a)(2) of the Act, or the concurrence of the USFWS or NMFS is not required.

6.2 Potential Effects of the Use of Glyphosate

APHIS met with USFWS officials on June 15, 2011 to discuss whether APHIS has any obligations under the ESA regarding analyzing the impacts of herbicide use associated with all GE crops on TES. As a result of these joint discussions, the USFWS and APHIS have agreed that it is not necessar y for APHIS to perform an ESA effects analysis on herbicide use associated either with Maize Line HCEM485 or with all GE crops currently planted because the EPA has both complete regulatory authority over the labeling of pesticides and the necessary techni cal expertise to assess pesticide effects on the environment under FIFRA. APHIS has no statutory authority to authorize or regulate the use of glyphosate, or any other herbicide, by corn growers. Under Part 340 regulations, APHIS only has authority to re gulate Maize Line HCEM485 or any GE organism as long as the agency believes it may pose a plant pest risk. APHIS has no regulatory jurisdiction over any other risks associated with GE organisms including risks resulting from the use of herbicides or other pesticides on those organisms. Nevertheless, APHIS is aware that there may be potential environmental impacts resulting from the use of glyphosate on Maize Line HCEM485, including potential impacts on TES and critical habitat, based on assessments provid ed by the EPA, and in peer reviewed scientific literature. APHIS is providing the available information of potential environmental impacts resulting from glyphosate use on Maize Line HCEM485 below.

6.2.1 EPA Endangered Species Protection Program (ESPP)

On Octob er 7, 1988 , Congress enacted Public Law 100

- 478 to in part address the relationship between the ESA and EPA’s pesticide labeling program (Section 1010) by requiring EPA to conduct a study, and report to Congress, on ways to implement EPA’s endangered species pesticide labeling program in a manner that both complies with the ESA and allows people to continue production of agricultural food and fiber. This law provided a clear sense that Congress104 wanted EPA to fulfill its obligation to conserve listed species, while at the same time consider the needs of agriculture and other pesticide users (70 FR 66392).

In 1988

, EPA established the ESPP to meet its obligations unde r the ESA. The EPA’s Endangered Species Protection Program w eb site ( http://www.epa.gov/espp/ ) describes the EPA assessment process for endangered species. Some of the elements of that process are summarized below. The goal of EPA's ESPP is to carry out its responsibilities under FIFRA in compliance with the ESA without placing unnecessary burden on agriculture and other pesticide users consistent with Congress’ s intent. EPA is responsible for reviewing pesticide information and data to determine whether a pesticide product may be registered for a particular use, including those uses associated with the approval of biotechnology products. As part of that determination, the Agency assesses whether listed endangered or threatened species or their designated critical habitat may be affected by use of the pesticide product. All pesticide products that EPA determines “may affect” a listed species or its designated critical habitat may be subject to the ESPP. If limita tions on pesticide use are necessary to protect listed species in areas where a pesticide may be used, the information is related through Endangered Species Protection Bulletins. Bulletins identify the species of concern and the pesticide active ingredien t that may affect the listed species. They also provide a description of the protection measures necessary to protect the species, and contain a county

- level map showing the geographic area(s) associated with the protection measures, depending on the susc eptibility of the species. Bulletins are enforceable as part of the product label ( http://www.epa.gov/oppfead1/endanger/basic

- info.htm ).

6.2.2 EPA TES Evaluation Process

The EPA evaluates liste d species and their critical habitat concerns within the context of pesticide registration and registration review so that when a decision is made, it fully addresses issues relative to listed species protection. If a risk assessment determines that use l imitations are necessary to ensure that legal use of a pesticide will not harm listed species or their critical habitat, EPA may either change the terms of the pesticide registration or establish geographically specific pesticide use limitations ( http://www.epa.gov/oppfead1/endanger/basic

- info.htm ).

The EPA’s review of the pesticide and its registration decision is independent of APHIS’ review and regulatory decisions under 7 CFR part 340. EPA does not require data or analyses conducted by APHIS to complete its reviews. The EPA evaluates extensive toxicity, ecological effects data, environmental fate, and transport and behavior data, most of which is required under FIFRA data requirements, to assess and determine how a pesticide will move through and break down in the environment. Risks to various taxa, e.g., birds, fish, invertebrates, plants and mammals are routinely assessed and used in EPA’s determinations of whether a pesticide may be licensed for use in the U.S.

The EPA’s core pesticide risk assessment and regulatory processes ensure that protections are in place for all populations of non

- target species, not just TES

. The EPA has developed a comprehensive risk assessment process mod eled after, and consistent with, EPA’s numerous guidelines for environmental assessments ( http://www.epa.gov/oppfead1 /endanger/consultation/ecorisk

- overview.pdf ). T he result of an assessment, which may go through several refinements, is to determine whether the potential effects of a pesticide’s registration to a listed species will result in either a “no effect” or “may affect” determination. The EPA consults on de terminations that “may affect” a listed species or adversely modify its105 critical habitat ( http://www.epa.gov/oppfead1/endanger ). As a result of either an assessment or consultation, EPA may require chan ges to the use conditions specified on the label of the product. When such changes are necessary only in specific geographic areas rather than nationwide to ensure protection of the listed species, EPA implements these changes through geographically

- speci fic Endangered Species Protection Bulletins; otherwise, these changes are applied to the label for all uses of the pesticide.

6.2.3 Ecological Risks of Glyphosate The ecological risks associated with use of glyphosate as an herbicide have been assessed several
t imes since 1974 when it was first registered for use in the U.S. In addition, EPA has consulted with the USFWS on the effects of glyphosate on listed species and critical habitat. Findings from relevant ecological risk assessments and the results and sta tus of consultations are summarized below.

In the June 1986 Registration Standard for glyphosate, the EPA discussed consultations with the USFWS on hazards to crops, rangeland, silvicultural sites, and the Houston toad which may result from the use of glyp hosate. Because a jeopardy opinion resulted from these consultations, the agency imposed endangered species labeling requirements in the Registration Standard to mitigate the risk to endangered species.

In 1993, g lyphosate was assessed by the EPA for the RED ( US

- EPA, 1993b ) . The RED concluded that direct risks to birds, mammals, invertebrates

, and fish would be minimal. Under certain conditions, aquatic plants were expected to be at risk from glyphosate use. Additional data were needed for non

- target terrestrial plants, including incident data and vegetative vigor testing on non

- target terres trial plants. The assessment stated that many endangered plants may be at risk from use of glyphosate with the registered use patterns. In addition, it w as determined that the Houston t oad may be at risk from use of glyphosate on alfalfa. The RED result ed in label changes to provide protection of aquatic organisms.

In 2003, the USDA ’s Forest Service had a risk assessment conducted for glyphosate uses in Forest Service vegetation management programs ( USDA

- FS, 2003 ) . For forestry uses, all

comme rcial formulations of glyphosate contained the isopropylamine salt of glyphosate. Application rates ranged from 0.5 pounds acid equivalent per acre ( lb ae/Ac ) to 7 lb ae/Ac with the most typical at 2 lb ae/Ac. Based on the available data, the USDA conclu ded that the risks were minimal to mammals, birds, fish, amphibians, invertebrates, and aquatic plants. Risks to fish following application of the more toxic formulations were not considered to be high; however, the assessment did state that at an applica tion rate of 7 lb ae/Ac, the acute exposures slightly exceeded the acute LC 50 12 for a more tolerant freshwater fish and exceeded it by a factor of 2 for the less tolerant fish. These values were estimated from a worst

- case scenario where there was a severe rainfall of about 7 inches over a 24

- hour period in an area where runoff is favored. USDA did not conduct a separate assessment for amphibians. The document concluded the amphibian data indicated glyphosate is no more toxic to amphibians than it is to f ish. For terrestrial plants, the assessment concluded that for relatively tolerant plants, when a low

- boom spray is utilized as the method of application, there is no indication glyphosate would

12 The concentration of a toxicant in the air or water that is lethal to 50% of the test organisms within a designated period. The lower the LC 50 value, the more lethal the compound.106 result in damage from spray drift at distances from the appl ication site of 25 feet or greater. For more sensitive plants, the distance increased to approximately 100 feet. For applications requiring the use of backpack

- directed spray, the distances would be less. No risks to terrestrial plants from runoff were expected.

In 2004, the EPA issued a report, “Glyphosate Analysis of Risks to Endangered and Threatened Salmon and Steelhead”. The analysis included 11 Evolutionary Significant Units (ESU )

- a population that is considered distinct for purposes of conserva tion

- in California with one unit extending into southern Oregon. Much of the quantitative information presented and used was derived from the 1993 RED Ecological Risk Assessment. Testing was performed with formulated products, in addition to glyphosate alone, and included acute and chronic toxicity. Testing of the pure product indicate that pure glyphosate is practically non

- toxic to the species examined. Glyphosate was moderately toxic to practically non

- toxic in formulated products. Since this is s omewhat increased over results with the pure chemical, the report concluded that it appears likely due to the added agents, generally surfactants. The EPA uses a variety of chemical fate and transport data to develop “estimated environmental concentration s” (EECs) from a suite of established models. The EECs were used with toxicity for the most sensitive species from technical grade testing of the active ingredient to develop acute risk quotients (RQ s ). The RQ analysis indicates that glyphosate applied a t 5.062 pounds active ingredient per

acre ( lb ai/Ac ) does not present an acute risk to endangered and threatened salmonids from direct effects because the calculated RQ is less than the level of concern (LOC). The primary indirect effect of concern would be for the food source for listed fish. The report concluded that this rate of application does not present indirect effects from loss of food or loss of cover, as the RQs for invertebrates and plants is less than the LOC. However, the assessment determi ned that use of glyphosate “may affect , but is not likely to adversely affect” the species based on acute toxicity to fish for uses with application rates above 5 lb ai/Ac. For uses with application rates below 5 lb ai/Ac, the Agency determined glyphosate would have no effect on the 11 ESUs.

In 2006, the EPA assessed glyphosate for a new use on bentgrass ( US

- EPA, 2006a ) (0.74 lb ai/Ac) and for new uses on Indian mulberry (noni), dry peas, lentils, garbanzo ( US

- EPA, 2006b )

, safflower

, and sunflower ( US

- EPA, 2006c )

, with the highest proposed ground application rate of 3.73 lb ae/Ac. For all proposed new uses, the EPA concluded that there was minimal risk of direct acute effects to terrestrial animals (birds and mammals) and aquatic animals (fish, amphibians, and invertebrates) and mi nimal risk to terrestrial plants (both non

- target and endangered plant species), aquatic non

- vascular (algae and diatoms) and vascular (duckweed) plants from off

- target spray drift and runoff from ground

- based applications. In addition, there were no chro nic risks to animals.

In 2008, as a part of EPA’s TES effects assessment for the California red

- legged frog (CRLF)

, EPA evaluated the effect of glyphosate use at rates up to 7.95 lb ae/Ac on fish, amphibians, aquatic invertebrates, aquatic plants, birds, m ammals, and terrestrial invertebrates ( US

- EPA, 2008b ) . This assessment determined that at the maximum application rate for in

- crop applications of glyphosate to glyphosate

- resistant corn (8 aerial applications of 0.75 lb ae/Ac and 2 ground applications of 3.75 and 2.25 lb ae/Ac), there would be no effects of glyphosate use on the following taxa of TES : fish, amphibians, birds, and mammals. The EPA assessment was uncertain of the effects on terrestrial invertebrates, citing the potential to affect small insects at107 all application rates and large insects at the 7.95 lb ae/Ac acre rate which is above the maximum rate for glyphosate

- resistant corn.

In 2010, EPA issued the memorandum Assessment of Ecologic al Risk for Glyphosate, potassium salt ( Pesticide Chem ical Code 103613; Chemical Abstract Service Number ( CAS# ) 70901

- 12

- 1) for Label Supplement to Add Uses on Roundup Ready Sweet Corn. Because of the potential risk from surfactants, a conservative estimation of risk to aquatic organisms was conducted on a f

ormulation basis as well as on a glyphosate acid equivalent basis. The names and CAS numbers of the surfactant are proprietary and are not provided in the assessment. Instead the surfactant POEA mixture (CAS # 61791

- 26

- 2) was used because it has been use d in glyphosate products and is known to be considerably more toxic to aquatic organisms than technical glyphosate. The assessment was completed with the assumption that the proposed surfactants are similar to POEA. Based on the proposed labels, the maxi mum application rate on a glyphosate acid equivalent basis is 3.71 lb ae/Ac glyphosate and on a formulation basis is 9.35 lb formulation/Ac.

The risk to fish, aquatic phase amphibians, aquatic invertebrates, aquatic plants, birds, reptiles, terrestrial pha se amphibians, mammals, terrestrial invertebrates, and terrestrial plants was analyzed. The assessment concluded that there was no risk to fish, aquatic phase amphibians, aquatic invertebrates, aquatic plants, and mammals because the RQs did not exceed th e LOCs for any of these groups. Because of the lack of toxicity studies for reptiles and terrestrial phase amphibians, birds are used as a surrogate. None of the available acute and subacute avian studies showed mortality so RQs were not calculated for b irds. All of the terrestrial EEC values are lower than the highest dose/concentration tested (3.71 lb ae/Ac glyphosate), but many of the EECs for 20

- gram birds were greater than 1/10th of that dose. For 100

- gram birds, several EECs were greater than 1/10 th of the highest dose and with the 1.15 lb ae/Ac dose applied 4 times per

season ; t herefore, there is uncertainty associated with the effect to listed birds, reptiles, and terrestrial phase amphibians. The chronic LOC for birds (LOC = 1) was exceeded for application to short grasses at the highest dose (3.71 lb ae/Ac glyphosate) (RQ = 1.07). However, because there were no effects at the highest concentrations in the bird studies and the RQ was only slightly greater than the LOC, the risk following chroni c exposure is expected to be minimal. The assessment concluded that the risk to terrestrial invertebrates is negligible based on glyphosate’s classification as practically non

- toxic to honeybees. Lastly, for listed terrestrial plants, the RQ is lower tha n the LOC at the highest application rate when applied via ground applications, but are exceeded for listed and non

- listed monocots and dicots when aerially applied at this 3.71 lb ae/A c glyphosate rate.

The EPA is currently conducting a registration review for glyphosate ( US

- EPA, 2009b ) . EPA plans to conduct comprehensive human health and ecological risk assessments, including an endangered species assessment for uses and formulations of glyphosate, including risks due to surfactants included in formulations designated only for terrestrial applications. The EPA estimates completing the reg istration review in 2015. The ecological risk assessment planned during the registration review will allow EPA to determine whether glyphosate’s use has “no effect” on or “may affect” federally listed TES or their designated critical habitat. When an

ass essment concludes that a pesticide’s use “may affect” a listed species or its designated critical habitat, EPA will consult with the USFWS and/or NMFS, as appropriate, and may develop labels that restrict the pesticide’s use or specify certain conditions, e.g., minimum separation distances between areas sprayed with glyphosate

- based herbicides and habitats of TES

.108 6.2.4 Potential Impacts of Glyphosate Use in the Production of Corn Under the Preferred Alternative, Stine does not propose any change in the currently permitted uses of glyphosate ( Stine, 2011 ) . As discussed in Subsection 4.2.1, Acreage and A rea, Maize Line HCEM485 would not require new natural lands to be converted to agricultural use. Corn is widely produced throughout 49 states; in 2011, 72% of planted corn was herbicide

- resistant. As described in Subsection 4.2.2, Agronomic Practices, Ma ize Line HCEM485 also does not have cultural requirements different from other glyphosate

- resistant corn varieties that would change glyphosate application rates to corn. Of the 98% of planted corn that received herbicide applications in 19 survey states in 2010, 66% were treated with glyphosate ( USDA

- NASS, 2011c ) (see Subsection 2.1.2, Agronomic Practices). As discussed in Subsection 4.2.2, Agronomic Practices, Maize Line HCEM485 is anticipated to replace other glyphosate

- resistant corn cultivars and no change to the registered use of glyphosate is proposed; as such, no change to the use rate of glyphosate i s expected as a result of extending Maize Line HCEM485 nonregulated status.

As discussed above, the goal of EPA's ESPP is to carry out its responsibilities under FIFRA in compliance with the ESA. As part of the registration and reregistration process, E PA reviews pesticide products to ensure they meet the requirements of FIFRA and ESA, and to assess whether listed endangered or threatened species or their designated critical habitat may be affected by use of the pesticide product. An assessment and subs equent consultation in which a “may affect” determination is made may require changes to the use conditions specified on the label of the product. States have primary authority for compliance monitoring and enforcing use of pesticides by the label require ments. Violators of the regulations are liable for all negative consequences of their actions (FIFRA 7 U

. S

. C

. 136j (a)(2)(G) Unlawful Acts) ; t herefore, growers that use glyphosate are very likely to follow its label restrictions.

In summary, glyphosate would likely continue to be a major component of weed management in corn production and no changes in agronomic practices are expected as a consequence of extending a nonregulated determination to Maize Line HCEM485. In addition, pesticide labels require precautions be taken to protect TES. For these reasons, glyphosate use resulting from a nonregulated determination for Maize Line HCEM485 does not present an increase in potential impacts to TES

.109 

### 7 CONSIDERATION OF EXE CUTIVE ORDERS, STAND ARDS, AND TREATIE S RELATING TO ENVIRONMENTAL IMPACT S

7.1.1 Executive Orders with Domestic Implications The following EOs require consideration of the potential impacts of the Federal action to various segments of the population.

• EO 12898 (US

- NARA, 2010), "Federal Actions to Address Environmental Justice in Minority Populations and Low

- Income Populations," requires Federal agencies to conduct their programs, policies, and activities that substantially affect human health or the environment in a manner so as not to exclude pers ons and populations from participation in or benefiting from such programs. It also enforces existing statutes to prevent minority and low

- income communities from being subjected to disproportionately high and adverse human health or environmental effects

.

• EO 13045, “Protection of Children from Environmental Health Risks and Safety Risks,” acknowledges that children may suffer disproportionately from environmental health and safety risks because of their developmental stage, greater metabolic activity lev els, and behavior patterns, as compared to adults. The EO (to the extent permitted by law and consistent with the agency’s mission) requires each Federal agency to identify, assess, and address environmental health risks and safety risks that may dispropo rtionately affect children.

The No Action and Preferred Alternatives were analyzed with respect to EO 12898 and EO 13045. Neither alternative is expected to have a disproportionate adverse effect on minorities, low

- income populations, or children.

Avail able mammalian toxicity data associated with the EPSPS protein establish the safety of Maize Line HCEM485 and its products to humans, including minorities, low

- income populations, and children who might be exposed to them through agricultural production an d/or processing. No additional safety precautions would need to be taken with nonregulated Maize Line HCEM485.

Human toxicity has also been thoroughly evaluated by the EPA in its development of pesticide labels for glyphosate ( US

- EPA, 1993b ; US

- EPA, 2009b ; US

- EPA, 2009c ) . Pesticide labels include use precautions and restrictions intended to protect workers and their families from exposures. APHIS assumes that growers will adhere to herbicide use precautions and restrictions. A s discussed in Subsection 4.5, Human Health, the potential use of glyphosate on Maize Line HCEM485 at the proposed application rates would be no more than that currently approved for other nonregulated glyphosate

- resistant corn and found by the EPA not to have adverse impacts to human health when used in accordance with label instructions. It is expected that the EPA and ERS would monitor the use of Maize Line HCEM485 to determine impacts on agricultural practices, such as chemical use, as they have done p reviously for herbicide

- resistant products.110 Based on these factors, an extension of a determination of nonregulated status to Maize Line HCEM485 is not expected to have a disproportionate adverse effect on minorities, low

- income populations, or children.

T he following EO addresses Federal responsibilities regarding the introduction and effects of invasive species:

• EO 1311 (US

- NARA, 2010), “Invasive Species,” states that Federal agencies take action to prevent the introduction of invasive species, to provide for their control, and to minimize the economic, ecological, and human health impacts that invasive species

cause.

Field corn is not listed in the U.S. as a noxious weed species by the Federal government ( USDA

NRCS, 2010b ) , nor is it listed as an invasive species by major invasive plant data bases ( University of Georgia and USDOI

- NPS, 2009 ; GRN, 2012 )

. As discussed in Subsection 2.3.3, Gene Flow and Weediness, c ultivat ed corn seed does not have the ability to survive in the wild and requires human involvement for seed dispersion ( OECD, 2003 ) . In addit ion, corn seed lacks dormancy

, will not produce a persistent seed bank , and is large and heavy and not easily dispersed by wind or water ( Mallory

- Smith and Zapiola, 2008 ) ; therefore, the chance of co rn becoming invasive as a result of seed dispersion is not likely. As discussed in Subsection 2.3.3, Gene Flow and Weediness, corn and various teosinte species are culturally and biologically similar, and gene exchange between these groups has been docume nted, no successful weedy species has evolved and the potential for gene flow between Z

. mays and sexually compatible wild relatives is not considered a significant agricultural or environmental risk ( US

- EPA, 2011b )

. As such, the potential for a weedy species of corn to develop as a result of outcrossing with Maize Line HCEM485 is considered to be highly unlikely.

Volunteer corn can become extensive in crop fields, competing with desired crops for light, moisture, and nutrients ( Wil son et al., No Date )

. There have been reports of some volunteer glyphosate

- resistant corn occurring in fields, even if glyphosate

- resistant corn was not planted the previous year, thought to be a result of transgene pollen movement ( Beckie and Owen, 2007 )

. While pollen mediated gene transfer can occur, as discussed in Subsection 2.3.3, Gene Flow and Weediness, gene flow decreases rapidly with separation distance. Recommended methods to control volunteer corn include using a combination of techniques such as alternating the glyphosate

- resistant corn with non

- GE crops, or with GE crop cultiva rs having resistance to herbicides with different modes of action, and then application of that herbicide post

- emergence

. For example, growers could plant LibertyLink® soybean and treat it with glufosinate ( Beckie and Owen, 2007 ) . Others successfully utilize graminicides to control glyphosate

- resistant corn in crops not susceptible to the herb icide. See Subsection 2.3.2, Plants Communities, for a more extensive discussion on controlling volunteer corn. Non

- GE corn , as well as other GE herbicide

resistant corn varieties, is widely grown in the U.S. Based on historical experience with these varieties

, and the data submitted by the developer and reviewed by APHIS, Maize Line HCEM485 plants are similar in fitness characteristics to other corn varieties currently grown ; hence, they are not expected to become weedy or invasive ( USDA

- APHIS, 2011b )

.111 The following executive order requires the protection of migratory bird populations:

• EO 13186 (US

- NARA, 2010), “Responsibilities of Federal Agencies to Protect Migratory Birds,” states that federal agencies taking actions that have, or are likely to have, a measurable negative effect on migratory bird populations are directed to develop and implement, within two years, a Memorandum of Understanding with the Fish and Wildlife Service that shall promote the conservation of migratory bird populations.

Migratory birds may be found in cornfields as corn is a nutrient

- rich food source for fat synthesis prior to migration ( Krapu et al., 2004 ) . Several species of birds are also known to forage for insects and seeds found in and adjacent to cornfields ( Best et al., 1990 ; Tremblay et al., 2001 ; Puckett et al., 2009 ) . As discussed in Subsection 4.4.1, Animal C ommunities, data submitted by the developer indicates that levels of key nutrients, minerals, antinutrients, and secondary metabolites in Maize Line HCEM485 were similar to the comparators, by extension the antecedent GA21 variety, and other commercial cor n varieties ( Stine, 2011 )

. The EPSPS protein that confers glyphosate resistance in GA21 (the antecedent of Maize Line HCEM485) is corn

derived, and 99.3% identical to its non

- herbicide

- resistant corn comparators ( Monsanto, 1997 )

. It has been previously evaluated by the FDA, ( US

- FDA, 1998a )

. According to the consultation note,

“ Monsanto has concluded that corn containing transformation event GA21 is not materially different in composition, nutrition, and safety from corn currently grown, processed, marketed, and consumed for animal feed or human food. At this time, based on Monsa nt o's description of its data and analyses, the Agency considers Monsanto's consultation on corn from varieties containing transformation event GA21 to be complete. ”

The environmental effects associated with glyphosate are summarized in the EPA RED for the herbicide ( US

- EPA, 1993b ) . Testing indicates that ecological toxicity of glyphosate is no more than slightly toxic to birds and does not exceed the agency’s LOC ( US

- EPA, 1993b ) ; however, in accordance with new requirements under 40 CFR part 158, acute avian oral toxicity data for a passerine species (perching birds) is required for the current glyphosate registration review. Based on these factors, it is unlikely that extending a determinati on of nonregulated status to Maize Line HCEM485 would have a negative effect on migratory bird populations.

7.1.2 International Implications

• EO 12114 (US

- NARA, 2010), “Environmental Effects Abroad of Major Federal Actions” requires federal officials to take into consideration any potential environmental effects outside the U.S., its territories, and possessions that result from actions being taken.

APHIS has given this EO careful consideration and does not expect a significant environmental impact outside the U .S. if APHIS extends a determination of nonregulated status to Maize Line HCEM485. All existing national and international regulatory authorities and phytosanitary regimes that currently apply to introductions of new corn cultivars internationally apply e qually to those covered by an APHIS determination of nonregulated status under 7 CFR part 340.112 Any international trade of Maize Line HCEM485 subsequent to an extension of a determination of nonregulated status of the product would be fully subject to nat ional phytosanitary requirements and be in accordance with phytosanitary standards developed under the International Plant Protection Convention ( IPPC, 2010 ) . The purpose of the IPPC “is to secure a common and effective action to prevent the spread and introduction of pests of plants and plant products and to promote appropriate measures for their control” ( IPPC, 2010 ) . The protection it affords extends to natural flora and plant products and includes both direct and indirect damage by pests, including weeds.

The IPPC establishes a standard for the reciprocal acceptance of phytosanitary certification among the nations that have signed or acceded to the Convention (172 countries as of March 2010). In April 2004, a standard for Plant Risk Analysis ( PRA ) of LMOs was adopted at a meeting of the governing body of the IPPC as a supplement to an existing standard, International Standard for Phytosanitary Measure No. 11 ( ISPM

- 11, Pest Risk Analysis for Quarantine Pests). The standard acknowledges that all LMOs will not present a pest risk and that a determination needs to be made early in the PRA for importation as to whether the LMO poses a potential pest risk resulting from the genetic modification. APHIS pest risk assessment procedures for genetically engineered organisms are consistent with the guidance developed under the IPPC. In addition, issues that may relate to commercialization and transboundary movement of pa rticular agricultural commodities produced through biotechnology are being addressed in other international forums and through national regulations.

The Cartagena Protocol on Biosafety is a treaty under the United Nations CBD that established a framework for the safe transboundary movement, with respect to the environment and biodiversity, of LMOs, which include those modified through biotechnology. The Protocol came into force on Sept ember 11, 2003, and 160 countries are Parties to it as of December 2010 ( CBD, 2010 ) . Although the U.S. is not a party to the CBD, and thus not a party to the Cartagena Protocol on Biosafety, U.S. exporters will still need to comply with those regulations that importing countries which are Parties to the Protocol have promulgated to comply with their obligations. The first intentional transboundary movement of LMOs intended for environmental release (field trials or commercial planting) will require consent from the importing country under an advan ced informed agreement (AIA) provision, which includes a requirement for a risk assessment consistent with Annex III of the Protocol and the required documentation.

LMOs imported for food, feed, or processing (FFP) are exempt from the AIA procedure, and ar e covered under Article 11 and Annex II of the Protocol. Under Article 11, Parties must post decisions to the Biosafety Clearinghouse database on domestic use of LMOs for FFP that may be subject to transboundary movement. To facilitate compliance with ob ligations to this protocol, the U.S. Government has developed a website that provides the status of all regulatory reviews completed for different uses of bioengineered products ( NBII, 2010 ) . These data will be available to the Biosafety Clearinghouse.

APHIS continues to work toward harmonization of biosafety and biot echnology consensus documents, guidelines, and regulations, including within the North American Plant Protection Organization (NAPPO), which includes Mexico, Canada, and the U.S., and within the OECD. NAPPO has completed three modules of the Regional Stan dards for Phytosanitary Measures No.113 14

, Importation and Release into the Environment of Transgenic Plants in NAPPO Member Countries ( NAPPO, 2003 )

. APHIS also participates in the North American Biotechnology Initiative , a forum for information exchange and cooperation on agricultural biotechnology issues for the U.S., Mexico, and Canada. In addition, bilateral discussions on biotechnology regulatory issues are held regularly with other countries including Argentina, Brazil, Japan, China, and Korea.

7.1.3 Compliance with Clean Water Act and Clean Air Act This EA evaluated the potential changes in corn production associated with an extension of a determination of nonregulated status to Maize Line HCEM485 (see Subsection s 4.2 .1

, Acreage and Area, and 4.2.2, Agricultural Production of Corn) and determined that the cultivation of Maize Line HCEM485 would not lead to the increase in, or expand the area of

, corn production that could impact water resources or air quality any differently than currently cultivated corn varieties . The herbicide resistance conferred by the genetic modification to Maize Line HCEM485 is not expected to result in any changes in water usage for cultivation compared to current corn production . As discussed in Subsection s 4.3.2, Water Resources, and 4.3.3, Ai r Quality, there are no expected significant negative impacts to water resources or air quality from potential use of glyphosate or other pesticides associated with Maize Line HCEM485 production. Based on these analyses, APHIS concludes that an extension of a determination of nonregulated status to Maize Line HCEM485 would comply with the CWA and the CAA.

7.1.4 Impacts on Unique Characteristics of Geographic Areas

Extension of a determination of nonregulated status to Maize Line HCEM485 is not expected to impact unique characteristics of geographic areas such as parklands, prime farmlands, wetlands, wild and scenic areas, or ecologically critical areas.

Stine has presented results of agronomic field trials for Maize Line HCEM485 that demonstrate there are no diff erences in agronomic practices

, between Maize Line HCEM485 and currently available glyphosate

- resistant corn varieties like GA21 ( Stine, 2011 ; USDA

- APHIS, 2011b )

. The common agricultural practices that would be carried out in the cultivation of Maize Line HCEM485 are not expected to deviate from current practices, including the use of EPA

registered pesticides. The product is expected to be cultivated by growers on agricultural land currently suitable for production of corn , and is not antic ipated to expand the cultivation of corn to new, natural areas

.
The Preferred Alternative does not propose major ground disturbances or new physical destruction or damage to property , or any alterations of property, wildlife habitat, or landscapes ; moreover, n o prescribed sale, lease, or transfer of ownership of any property is proposed . This action is limited to a n extension of a determination of nonregulated status to Maize Line HCEM485 . This action would not convert land use to nonagricultural u se and, therefore, would have no adverse impact on prime farmland. Standard agricultural practices for land preparation, planting, irrigation, and harvesting of plants would be used on agricultural lands planted to Maize Line HCEM485 , including the use of EPA

- registered pesticides. The Applicant’s adherence to EPA label use restrictions for all pesticides is expected to mitigate potential impacts to the human environment.114 With regard to pesticide use, a n extension of a determination of nonregulated statu s to Maize Line HCEM485 is not likely to result in changes to the use of glyphosate on corn, including application timing and rates and annual maximum allowable applications. APHIS assumes that the grower will closely adhere to EPA label use restrictions for glyphosate

. Glyphosate was assessed by the EPA in 1993 and is currently under reregistration review scheduled for completion in 2015 ( US

- EPA, 2009a )

. Potential impacts to unique geographic areas have bee n considered by the EPA in its evaluation of glyphosate . In 1993 , the EPA completed a reregistration analysis for glyphosate which considered human health risk and ecological risks associated with potential exposure to glyphosate in multiple pathways ( US

- EPA, 1993b )

. As a result of court orders and settlements, an endangered species assessment evaluating the potential impacts of the use of g lyphosate on the f ederally t hreatened CRLF is underway ( US

EPA, 2009b )

. T he EPA has requested initiation of formal consultation with the USFWS under Section 7 of the ESA to address the potential effects of glyphosate on the CRLF ( US

- EPA, 2009b ) . The EPA’s forma l consultation request for the CRLF was based on the potential for direct and indirect effects due to decreases in prey items, as well as potential impacts to habitat (See Section 6, Threatened and Endangered Species).

In 2004, the EPA made a “not likely t o adversely affect” determination from the use of glyphosate on 11 ESU s of salmon and steelhead in California and an ESU of salmon in southern Oregon ( US

- EPA, 2004 ) ( s ee Section 6, Threatened and Endangered Species)

. Formal consultation with the NMFS was initiated by EPA on October 12, 2004 to fulfill a Consent Decree entered into between EPA and the Californians’ for Alternatives to Toxics in regard s to the potential effects of various pesticide s us age on plants and certain threatened and endangered salmon or steelhead species.

While th is consultation i s ongoing

, the EPA has allowed glyphosate to remain on the market

, and it is approved for continued use in accordance with all label requirements. Submittals to this analysis can be found at the Regulations.gov website under do cket designation EPA

- HQ

- OPP

2009

- 0361

. The Agency plans to conduct a comprehensive ec ological risk assessment, including an endangered species assessment, for all uses of glyphosate and its salts ( US

- EPA, 2009b )

. Assess ments to determine impacts on unique geographic areas include:

• A n ecological risk assessment to determine whether the use of glyphosate has “no effect” or “may affect” federally listed TES or their designated critical habitat ; and

• A spray drift buffer zone analysis to evaluate potential exposure reductions to non

- target aquatic and terrestrial plants.

The information gathered during the ecological and endangered species risk assessment will be used by the EPA to make the registration review decision.

Based on these findings, including the assumption that label use restrictions are in place to protect unique geographic areas and that those label use restrictions are adhered to, a n extension115 of a determination of nonregulated status to Maize Line HCEM485 is no t expected to impact unique characteristics of geographic areas such as park lands, prime farm lands, wetlands, wild and scenic areas, or ecologically critical areas.

7.1.5 National Historic Preservation Act (NHPA) of 1966 as Amended

The National Historic Pres ervation Act ( NHPA ) of 1966 and its implementing regulations (36 CFR 800) require Federal agencies to: 1) determine whether activities they propose constitute "undertakings" that have the potential to cause effects on historic properties and 2) if so, to evaluate the effects of such undertakings on such historic resources and consult with the Advisory Council on Historic Preservation (i.e., State Historic Preservation Office, Tribal Historic Preservation Officers), as appropriate.

APHIS’ proposed action, an extension of a determination of nonregulated status to Maize Line HCEM485 is not expected to adversely impact cultural resources on tribal properties. Any farming activity that may be taken by farmers on tribal lands would only be conducted at the tri be’s request; thus, the tribes would have control over any potential conflict with cultural resources on tribal properties.

APHIS’ Preferred Alternative would have no impact on districts, sites, highways, structures, or objects listed in or eligible for li sting in the National Register of Historic Places, nor would it likely cause any loss or destruction of significant scientific, cultural, or historical resources. This action is limited to an extension of a determination of nonregulated status to Maize Li ne HCEM485

. APHIS’ proposed action is not an undertaking that may directly or indirectly cause alteration in the character or use of historic properties protected under the NHPA. In general, common agricultural activities conducted under this action do not have the potential to introduce visual, atmospheric, or noise elements to areas in which they are used that could result in effects on the character or use of historic properties. For example, there is potential for increased noise on the use and enjo yment of a historic property during the operation of tractors and other mechanical equipment close to such sites. A built

- in mitigating factor for this issue is that virtually all of the methods involved would only have temporary effects on the audible na ture of a site and can be ended at any time to restore the audible qualities of such sites to their original condition with no further adverse effects. Additionally, these cultivation practices are already being conducted throughout the corn production re gions. The cultivation of Maize Line HCEM485 is not expected to change any of these agronomic practices that would result in an adverse impact under the NHPA.116 

### 8 LIST OF PREPARERS

Biotechnology Regulatory Services David Reinhold, Assistant Director, Environmental Risks Analysis Programs
Rebecca L. Stankiewicz Gabel, Ph.D., Senior Environmental Protection Specialist, Environmental Risks Analysis Programs Craig Roseland, Ph.D., Senior Environmental Protection Specialist, NEPA Unit

Geo

- Marine, Inc.

Name Organization Project Role Suzanne Bates, M.S., Deputy Division Manager, Environmental Geo

- Marine, Inc. Quality Assurance

John Ouellette , M.S., Senior Program Manager Geo

- Marine, Inc. Quality Assurance

Susan Miller, M.A., Senior NEPA Project Manager Geo

- Marine, Inc. Project Management , Sections 1,3,5, Air Quality, Water Resources, Animal Feed Brian Bishop, M.S., NEPA Analyst Geo

- Marine, Inc. Sections 1,3,7, Soil Quality, Microorganisms, Weediness, Human Health, Endnote Meegan Wallace, M.S., Environmental Project Manager Geo

- Marine, Inc. Climate Change, Biological Diversity

Chris Lotts, B.S., Environmental Scientist Geo

- Marine, Inc. Animal Communities, Threatened and Endangered Species Michael Owen, Ph.D., Agronomist/Weed Scientist Iow a State University Agricultural Production of Corn, Plants Communities, Terrance Hurley, Ph.D., Economist University of Minnesota Domestic Economic Environment, Trade Economic Environment Stephen Moose, Ph.D., Corn Geneticist Illinois State University Corn Genetics Subject Matter Expert, Gene Flow Phyllis Fletcher, A.D., Document Production Manager, Editor Geo

- Marine, Inc. References, EndNote, Document Production, Editor

Anna Banda, M.S., Senior Administrative Assistant, Environmental Geo

- Marine, Inc

. Editor117 

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- 1 

### APPENDIX A FEDERALLY THREATENED AND ENDANGERED SPECIES IN CORN PRODUCTION U.S. STATES AND PUERTO RICOA

- 2 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (USFWS, 2012)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

A`e Zanthoxylum dipetalum var.

tomentosum HI P Endangered

A`e Zanthoxylum hawaiiense HI P Endangered

A`e Zanthoxylum oahuense HI P Proposed Endangered

`Ahinahina Argyroxiphium sandwicense ssp. macrocephalum HI P Threatened

`Ahinahina Argyroxiphium sandwicense ssp. sandwicense HI P Endangered

`Aiakeakua, popolo Solanum sandwicense HI P Endangered
`Aiea Nothocestrum breviflorum HI P Endangered
`Aiea Nothocestrum peltatum HI P Endangered
Akekee Loxops caeruleirostris HI V Endangered Akiapola`au (honeycreeper) Hemignathus munroi HI V Endangered

Akikiki Oreomystis bairdi HI V Endangered

`Akoko Chamaesyce celastroides var. kaenana HI P Endangered

`Akoko Chamaesyce deppeana HI P Endangered
`Akoko Chamaesyce eleanoriae HI P Endangered
`Akoko Chamaesyce herbstii HI P Endangered
`Akoko Chamaesyce kuwaleana HI P Endangered

`Akoko Chamaesyce remyi var. kauaiensis HI P Endangered

`Akoko Chamaesyce remyi var. remyi HI P Endangered
`Akoko Chamaesyce rockii HI P Endangered
`Akoko Euphorbia haeleeleana HI P Endangered

Alabama beach mouse Peromyscus polionotus ammobates AL V Endangered

Alabama canebrake pitcher

- plant Sarracenia rubra alabamensis AL P Endangered

Alabama cavefish Speoplatyrhinus poulsoni AL V Endangered Alabama cave shrimp Palaemonias alabamae AL I EndangeredA

- 3 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Alabama (=inflated) heelsplitter Potamilus inflatus AL, LA, MS I Threatened

Alabama lampmussel Lampsilis virescens AL, TN I Endangered
Alabama leather flower Clematis socialis AL, GA P Endangered
Alabama moccasinshell Medionidus acutissimus AL, GA, MS I Threatened

Alabama pearlshell Margaritifera marrianae AL I Proposed Endangered
Alabama red

- belly turtle Pseudemys alabamensis AL, MS V Endangered

Alabama streak

- sorus fern Thelypteris pilosa var. alabamensis AL P Threatened

Alabama sturgeon Scaphirhynchus suttkusi AL V Endangered Alameda whipsnake (=striped racer) Masticophis lateralis euryxanthus CA V Threatened

Alamosa springsnail Tryonia alamosae NM I Endangered
Alani Melicope adscendens HI P Endangered
Alani Melicope balloui HI P Endangered

Alani Melicope christophersenii HI P Proposed Endangered
Alani Melicope degeneri HI P Endangered
Alani Melicope haupuensis HI P Endangered

Alani Melicope hiiakae HI P Proposed Endangered
Alani Melicope knudsenii HI P Endangered
Alani Melicope lydgatei HI P Endangered

Alani Melicope makahae HI P Proposed Endangered
Alani Melicope mucronulata HI P Endangered
Alani Melicope munroi HI P Endangered
Alani Melicope ovalis HI P Endangered
Alani Melicope pallida HI P Endangered
Alani Melicope paniculata HI P Endangered
Alani Melicope puberula HI P Endangered
Alani Melicope quadrangularis HI P EndangeredA

- 4 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Alani Melicope reflexa HI P Endangered
Alani Melicope saint

- johnii HI P Endangered
Alani Melicope zahlbruckneri HI P Endangered Altamaha spinymussel Elliptio spinosa GA I Endangered Amargosa niterwort Nitrophila mohavens is CA, NV P Endangered

Amargosa vole Microtus californicus scirpensis CA V Endangered

Amber darter Percina antesella GA, TN V Endangered

American burying beetle Nicrophorus americanus AR, KS, MA, MO, NE, OH, OK, RI, SD, TX I Endangered

American chaffseed Schwalbea americana AL, FL, GA, LA, MS, NC, NJ, SC, VA P Endangered

American crocodile Crocodylus acutus FL V Threatened
American hart's

- tongue fern Asplenium scolopendrium var.
americanum AL, MI, NY,
TN P Threatened

Anastasia Island beach

mouse Peromyscus polionotus phasma FL V Endangered

`Anaunau Lepidium arbuscula HI P Endangered Anthony's riversnail Athearnia anthonyi AL, TN I Endangered
Antioch Dunes evening

- primrose Oenothera deltoides ssp. howellii CA P Endangered

`Anunu Sicyos alba HI P Endangered Apache trout Oncorhynchus apache AZ V Threatened Apalachicola rosemary Conradina glabra FL P Endangered Appalachian elktoe Alasmidonta raveneliana NC, TN I Endangered Appalachian monkeyface (pearlymussel) Quadrula sparsa TN, VA I Endangered

Applegate's milk

- vetch Astragalus applegatei OR P Endangered

Arizona Cliff

- rose Purshia (=Cowania) subintegra AZ P Endangered

Arizona hedgehog

cactus Echinocereus triglochidiatus var. arizonicus AZ P EndangeredA

- 5 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Arkansas fatmucket Lampsilis powellii AR I Threatened

Arkansas River shiner Notropis girardi AR, KS, NM, OK, TX V Threatened

Armored snail Pyrgulopsis (=Marstonia) pachyta AL I Endangered

Arroyo (=arroyo southwestern) toad Bufo californicus (=microscaphus) CA V Endangered

Ash

- breasted tit

- tyrant Anairetes alpinus NA 1 V Proposed Endangered
Ash

- grey paintbrush Castilleja cinerea CA P Threatened
Ash Meadows Amargosa pupfish Cyprinodon nevadensis
mionectes NV V Endangered

Ash Meadows blazingstar Mentzelia leucophylla NV P Threatened

Ash Meadows gumplant Grindelia fraxino

- pratensis CA, NV P Threatened

Ash Meadows ivesia Ivesia kingii var. eremica CA, NV P Threatened
Ash meadows milk

vetch Astragalus phoenix CA, NV P Threatened

Ash Meadows naucorid Ambrysus amargosus NV I Threatened Ash Meadows speckled dace Rhinichthys osculus nevadensis NV V Endangered

Ash Meadows sunray Enceliopsis nudicaulis var. corrugata CA, NV P Threatened

Ashy dogweed Thymophylla tephroleuca TX P Endangered Asplenium

- leaved diellia Diellia erecta HI P Endangered

Atlantic salmon Salmo salar ME V Endangered
Atlantic salt marsh snake Nerodia clarkii taeniata FL V Threatened

Attwater's greater prairie

- chicken Tympanuchus cupido attwateri TX V Endangered

Audubon's crested

caracara Polyborus plancus audubonii FL V Threatened

Aupaka Isodendrion hosakae HI P EndangeredA

- 6 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Aupaka Isodendrion laurifolium HI P Endangered Aupaka Isodendrion longifolium HI P Threatened

Autumn Buttercup Ranunculus aestivalis (=acriformis) UT P Endangered

Avon Park harebells Crotalaria avonensis FL P Endangered
`Awikiwiki Canavalia molokaiensis HI P Endangered
`Awikiwiki Canavalia napaliensis HI P Endangered
Awiwi Centaurium sebaeoides HI P Endangered
Awiwi Hedyotis cookiana HI P Endangered
Bachman's warbler (=wood) Vermivora bachmanii FL, SC V Endangered

Bakersfield cactus Opuntia treleasei CA P Endangered Baker's larkspur Delphinium bakeri CA P Endangered Banbury Springs limpet Lanx sp. ID I Endangered
Bariaco Trichilia triacantha PR P Endangered Barneby reed

- mustard Schoenocrambe barnebyi UT P Endangered Barneby ridge

- cress Lepidium barnebyanum UT P Endangered Barton Springs salamander Eurycea sosorum TX V Endangered

Bay checkerspot butterfly Euphydryas editha bayensis CA I Threatened

Bayou darter Etheostoma rubrum MS V Threatened Beach jacquemontia Jacquemontia reclinata FL P Endangered Beach layia Layia carnosa CA P Endangered Bear Valley sandwort Arenaria ursina CA P Threatened Beautiful goetzea Goetzea elegans PR P Endangered Beautiful pawpaw Deeringothamnus pulchellus FL P Endangered
Beautiful shiner Cyprinella formosa AZ, NM V Threatened
Bee Creek Cave harvestman Texella reddelli TX I Endangered

Behren's silverspot butterfly Speyeria zerene behrensii CA I Endangered

Beluga whale Delphinapterus leucas NA 1 V EndangeredA

- 7 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Ben Lomond spineflower Chorizanthe pungens var. hartwegiana CA P Endangered

Ben Lomond wallflower Erysimum teretifolium CA P Endangered

Big Bend gambusia Gambusia gaigei TX V Endangered Big

- leaved crownbeard Verbesina dissita CA P Threatened

Big Spring spinedace Lepidomeda mollispinis pratensis NV V Threatened

Birdwing pearlymussel Conradilla caelata TN, VA I Endangered
Black abalone Haliotis cracherodii NA 1 I Endangered Blackburn's sphinx moth Manduca blackburni HI I Endangered

Black

- capped vireo Vireo atricapilla OK, TX V Endangered
Black clubshell Pleurobema curtum MS I Endangered

Black

- footed ferret Mustela nigripes AZ, CO, KS, MT, ND, NE, NM, SD, UT,
WY V Endangered

Black lace cactus Echinocereus reichenbachii var. albertii TX P Endangered

Blackline Hawaiian damselfly Megalagrion nigrohamatum nigrolineatum HI I Proposed Endangered
Blackside dace Phoxinus cumberlandensis KY, TN, VA V Threatened Black spored quillwort Isoetes melanospora GA, SC P Endangered Bliss Rapids snail Taylorconcha serpenticola ID I Threatened Blowout penstemon Penstemon haydenii NE, WY P Endangered

Blue

- billed curassow Crax alberti NA 1 V Proposed Endangered Bluemask (=jewel)
Darter Etheostoma sp. TN V Endangered

Blue Ridge goldenrod Solidago spithamaea NC, TN P Threatened
Blue shiner Cyprinella caerulea AL, GA, TN V Threatened
Bluetail mole skink Eumeces egregius lividus FL V Threatened
Blue whale Balaenoptera musculus CA, MA V EndangeredA

- 8 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Blunt

- nosed leopard lizard Gambelia silus CA V Endangered

Bocaccio Sebastes paucispinis NA 1 V Endangered Bog (=Muhlenberg) turtle Clemmys muhlenbergii CT, DE, MD, NJ, NY, PA V Threatened

Bone Cave harvestman Texella reyesi TX I Endangered

Bonytail chub Gila elegans AZ, CA, CO, NV, UT V Endangered

Borax Lake chub Gila boraxobius OR V Endangered
Boulder darter Etheostoma wapiti AL, TN V Endangered
Bradshaw's desert

parsley Lomatium bradshawii OR, WA P Endangered

Brady pincushion

cactus Pediocactus bradyi AZ P Endangered

Braken Bat Cave Meshweaver Cicurina venii TX I Endangered

Braun's rock

- cress Arabis perstellata KY, TN P Endangered
Braunton's milk

- vetch Astragalus brauntonii CA P Endangered Britton's beargrass Nolina brittoniana FL P Endangered
Brooksville bellflower Campanula rob insiae FL P Endangered

Brown

- banded antpitta Grallaria milleri NA 1 V Proposed Endangered

Bruneau Hot springsnail Pyrgulopsis bruneauensis ID I Endangered

Buena Vista Lake ornate shrew Sorex ornatus relictus CA V Endangered

Bull Trout Salvelinus confluentus ID, MT, NV, OR, WA V Threatened

Bunched arrowhead Sagittaria fasciculata NC, SC P Endangered Bunched cory cactus Coryphantha ramillosa TX P Threatened Burke's goldfields Lasthenia burkei CA P Endangered Butte County meadowfoam Limnanthes floccosa ssp. californica CA P Endangered

Cahaba shiner Notropis cahabae AL V Endangered California clapper rail Rallus longirostris obsoletus CA V EndangeredA

- 9 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

California condor Gymnogyps californianus AZ, CA V Endangered
California freshwater shrimp Syncaris pacifica CA I Endangered

California jewelflower Caulanthus californicus CA P Endangered
California least tern Sterna antillarum browni AZ, CA V Endangered California Orcutt grass Orcuttia californica CA P Endangered
California red

- legged frog Rana draytonii CA V Threatened

California seablite Suaeda californica CA P Endangered
California taraxacum Taraxacum californicum CA P Endangered California tiger Salamander Ambystoma californiense CA V Endangered

California tiger Salamander Ambystoma californiense CA V Threatened

California tiger Salamander (Sonoma) Ambystoma californiense CA V Endangered

Calistoga allocarya Plagiobothrys strictus CA P Endangered Callippe silverspot butterfly Speyeria callippe callippe CA I Endangered

Canada Lynx Lynx canadensis CO, ID, ME, MI, MN, MT, NH, NY, OR, UT, VT, WA, WI, WY V Threatened

Canary Rockfish Sebastes pinniger NA 1 V Threatened

Canby's dropwort Oxypolis canbyi DE, GA, MD, NC, SC P Endangered

Canelo Hills ladies'

- tresses Spiranthes delitescens AZ P Endangered

Capa rosa Callicarpa ampla PR P Endangered Cape Fear shiner Notropis mekistocholas NC V Endangered Cape Sable seaside

sparrow Ammodramus maritimus mirabilis FL V Endangered

Carolina heelsplitter Lasmigona decorata NC, SC I EndangeredA

- 10 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Carolina northern flying squirrel Glaucomys sabrinus coloratus NC, TN, VA V Endangered

Carson wandering skipper Pseudocopaeodes eunus obscurus CA, NV I Endangered

Carter's mustard Warea carteri FL P Endangered Carter's panicgrass Panicum fauriei var. carteri HI P Endangered Caseys june beetle Dinacoma caseyi CA I Endangered
Catalina Island mountain

- mahogany Cercocarpus traskiae CA P Endangered

Cave crayfish Cambarus aculabrum AR I Endangered Cave crayfish Cambarus zophonastes AR I Endangered Chapman rhododendron Rhododendron chapmanii FL P Endangered

Cheat Mountain salamander Plethodon nettingi WV V Threatened

Cherokee darter Etheostoma scotti GA V Threatened
Chihuahua chub Gila nigrescens NM V Threatened Chinese Camp brodiaea Brodiaea pallida CA P Threatened

Chinook salmon Oncorhynchus (=Salmo) tshawytscha CA V Endangered

Chinook salmon Oncorhynchus (=Salmo) tshawytscha CA V Threatened

Chinook salmon Oncorhynchus (=Salmo) tshawytscha OR V Threatened

Chinook salmon Oncorhynchus (=Salmo) tshawytscha OR, WA V Threatened

Chinook salmon Oncorhynchus (=Salmo) tshawytscha WA V Endangered

Chinook salmon Oncorhynchus (=Salmo) tshawytscha WA V Threatened

Chipola slabshell Elliptio chipolaensis AL, FL I Threatened Chiricahua leopard frog Rana chiricahuensis AZ, NM V ThreatenedA

- 11 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Chisos Mountain hedgehog cactus Echinocereus chisoensis var. chisoensis TX P Threatened

Chittenango ovate amber snail Succinea chittenangoensis NY I Threatened

Choctaw bean Villosa choctawensis AL, FL I Proposed Endangered
Choctawhatchee beach

mouse Peromyscus polionotus allophrys FL V Endangered

Chorro Creek bog thistle Cirsium fontinale var. obispoense CA P Endangered

Chucky madtom Noturus crypticus TN V Endangered
Chum salmon Oncorhynchus (=Salmo) keta OR, WA V Threatened
Chum salmon Oncorhynchus (=Salmo) keta WA V Threatened Chupacallos Pleodendron macranthum PR P Endangered

Chupadera springsnail Pyrgulopsis chupaderae NM I Proposed Endangered
Clara Hunt's milk

- vetch Astragalus clarianus CA P Endangered

clay

- loving wild buckwheat Eriogonum pelinophilum CO P ndangered

Clay phacelia Phacelia argillacea UT P Endangered Clay reed

- mustard Schoenocrambe argillacea UT P Threatened Clay's hibiscus Hibiscus clayi HI P Endangered Clear Creek gambusia Gambusia heterochir TX V Endangered Clover lupine Lupinus tidestromii CA P Endangered Clover Valley speckled dace Rhinichthys osculus oligoporus NV V Endangered

Clubshell Pleurobema clava IL, IN, KY, MI, NY, OH, PA, TN, WV I Endangered

Coachella Valley fringe

- toed lizard Uma inornata CA V Threatened

Coachella Valley milk

- vetch Astragalus lentiginosus var. coachellae CA P EndangeredA

- 12 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Coastal California gnatcatcher Polioptila californica californica CA V Threatened

Coastal dunes milk

vetch Astragalus tener var. titi CA P Endangered

Cobana negra Stahlia monosperma PR P Threatened Cochise pincushion

cactus Coryphantha robbinsorum AZ P Threatened

Coffin Cave mold beetle Batrisodes texanus TX I Endangered

Coho salmon Oncorhynchus (=Salmo) kisutch CA V Endangered

Coho salmon Oncorhynchus (=Salmo) kisutch CA, OR V Threatened

Coho salmon Oncorhynchus (=Salmo) kisutch NA 1 V Threatened

Coho salmon Oncorhynchus (=Salmo) kisutch OR V Threatened

Cokendolpher Cave harvestman Texella cokendolpheri TX I Endangered

Colorado Butterfly plant Gaura neomexicana var. coloradensis CO, NE, WY P Threatened

Colorado hookless Cactus Sclerocactus glaucus CO P Threatened

Colorado pikeminnow (=squawfish) Ptychocheilus lucius AZ, CA, CO, NM, UT V Endangered

Columbian white

tailed deer Odocoileus virginianus leucurus OR, WA V Endangered

Colusa grass Neostapfia colusana CA P Threatened Comal Springs dryopid beetle Stygoparnus comalensis TX I Endangered

Comal Springs riffle beetle Heterelmis comalensis TX I Endangered

Comanche Springs pupfish Cyprinodon elegans TX V Endangered

Conasauga logperch Percina jenkinsi GA, TN V EndangeredA

- 13 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Conejo dudleya Dudleya abramsii ssp. parva CA P Threatened Conservancy fairy shrimp Branchinecta conservatio CA I Endangered

Contra Costa goldfields Lasthenia conjugens CA P Endangered

Contra Costa wallflower Erysimum capitatum var. angustatum CA P Endangered

Cooke's koki`o Kokia cookei HI P Endangered Cook's holly Ilex cookii PR P Endangered
Cook's lomatium Lomatium cookii OR P Endangered Cooley's meadowrue Thalictrum cooleyi FL, GA, NC P Endangered Cooley's water

- willow Justicia cooleyi FL P Endangered
Coosa moccasinshell Medionidus parvulus AL, GA, TN I Endangered Copperbelly water snake Nerodia erythrogaster neglecta IN, MI, OH V Threatened

coqui, Llanero Eleutherodactylus juanariveroi PR V Proposed Endangered Coyote ceanothus Ceanothus ferrisae CA P Endangered

Cracking pearlymussel Hemistena lata AL, KY, PA, TN, VA I Endangered

Crenulate lead

- plant Amorpha crenulata FL P Endangered Crested honeycreeper Palmeria dolei HI V Endangered
Crimson Hawaiian damselfly Megalagrion leptodemus HI I Proposed Endangered
Cui

- ui Chasmistes cujus NV V Endangered Culebra Island giant anole Anolis roosevelti PR V Endangered

Cumberland bean (pearlymussel) Villosa trabalis AL, KY, NC, TN, VA I Endangered

Cumberland darter Etheostoma susanae KY, TN V Endangered
Cumberland elktoe Alasmidonta atropurpurea KY, TN I Endangered
Cumberlandian combshell Epioblasma brevidens AL, KY, MS, TN, VA I EndangeredA

- 14 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Cumberland monkeyface (pearlymussel) Quadrula intermedia AL, TN, VA I Endangered

Cumberland pigtoe Pleurobema gibberum TN I Endangered Cumberland rosemary Conradina verticillata KY, TN P Threatened
Cumberland sandwort Arenaria cumberlandensis KY, TN P Endangered Curtis pearlymussel Epioblasma florentina curtisii AR, MO I Endangered Cushenbury buckwheat Eriogonum ovalifolium var.
vineum CA P Endangered

Cushenbury milk

- vetch Astragalus albens CA P Endangered

Cushenbury oxytheca Oxytheca parishii var. goodmaniana CA P Endangered

Cylindrical lioplax (snail) Lioplax cyclostomaformis AL I Endangered

Dark pigtoe Pleurobema furvum AL I Endangered

Davis' green pitaya Echinocereus viridiflorus var. davisii TX P Endangered

DeBeque phacelia Phacelia submutica CO P Threatened
Decurrent false aster Boltonia decurrens IL, MO P Threatened
Delhi Sands flower

loving fly Rhaphiomidas terminatus abdominalis CA I Endangered

Del Mar manzanita Arctostaphylos glandulosa ssp. crassifolia CA P Endangered

Delmarva Peninsula fox squirrel Sciurus niger cinereus DE, MD, VA V Endangered

Delta green ground beetle Elaphrus viridis CA I Threatened

Delta smelt Hypomesus transpacificus CA V Threatened

Deltoid spurge Chamaesyce deltoidea ssp. deltoidea FL P Endangered

Deseret milk

- vetch Astragalus desereticus UT P Threatened
Desert dace Eremichthys acros NV V Threatened Desert pupfish Cyprinodon macularius AZ, CA V EndangeredA

- 15 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Desert slender salamander Batrachoseps aridus CA V Endangered

Desert tortoise Gopherus agassizii AZ, CA, NV,
UT V Threatened

Desert yellowhead Yermo xanthocephalus WY P Threatened Devils Hole pupfish Cyprinodon diabolis NV V Endangered
Devils River minnow Dionda diaboli TX V Threatened
Diamond Head schiedea Schiedea adamantis HI P Endangered

Dromedary pearlymussel Dromus dromas AL, KY, TN, VA I Endangered

Dudley Bluffs bladderpod Lesquerella congesta CO P Threatened

Dudley Bluffs twinpod Physaria obcordata CO P Threatened

Dunes sagebrush lizard Sceloporus arenicolus NM, TX V Proposed Endangered Duskytail darter Etheostoma percnurum KY, TN, VA V Endangered
Dwarf Bear

- poppy Arctomecon humilis UT P Endangered
Dwarf

- flowered heartleaf Hexastylis naniflora NC, SC P Threatened

Dwarf iliau Wilkesia hobdyi HI P Endangered
Dwarf lake iris Iris lacustris MI, WI P Threatened Dwarf naupaka Scaevola coriacea HI P Endangered

Dwarf wedgemussel Alasmidonta heterodon CT, MA, MD, NC, NH, NJ, NY, PA, VA,
VT I Endangered

Eastern indigo snake Drymarchon corais couperi AL, FL, GA V Threatened

Eastern prairie fringed orchid Platanthera leucophaea IA, IL, IN, ME, MI, OH, OK, VA, WI P Threatened

Eastern puma (=cougar) Puma (=Felis) concolor

couguar NA 1 V Endangered

El Dorado bedstraw Galium californicum ssp.
sierrae CA P EndangeredA

- 16 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Elfin tree fern Cyathea dryopteroides PR P Endangered
Elkhorn coral Acropora palmata FL, PR I Threatened El Segundo blue butterfly Euphilotes battoides allyni CA I Endangered

Encinitas baccharis Baccharis vanessae CA P Threatened
Erubia Solanum drymophilum PR P Endangered

Eskimo curlew Numenius borealis NE, OK, SD,
TX V Endangered

Etonia rosemary Conradina etonia FL P Endangered
Etowah darter Etheostoma etowahae GA V Endangered Eureka dune grass Swallenia alexandrae CA P Endangered Eureka Valley evening

- primrose Oenothera avita ssp. eurekensis CA P Endangered

Everglade snail kite Rostrhamus sociabilis plumbeus FL V Endangered

Ewa Plains `akoko Chamaesyce skottsbergii var. kalaeloana HI P Endangered

Fanshell Cyprogenia stegaria AL, IL, IN, KY, OH, TN, VA,
WV I Endangered

Fassett's locoweed Oxytropis campestris var. chartacea WI P Threatened

Fat pocketbook Potamilus capax AR, IL, IN, KY, LA, MO, MS I Endangered

Fat three

- ridge (mussel) Amblema neislerii FL, GA I Endangered

Fender's blue butterfly Icaricia icarioides fenderi OR I Endangered

Few

- flowered navarretia Navarretia leucocephala ssp. pauciflora (=N. pauciflora) CA P Endangered

Finback whale Balaenoptera physalus AL, CA, CT, DE, FL, GA, LA, MA, MD, ME, MS, NC, NH, NJ, NY, PR, RI, SC, TX, VA V EndangeredA

- 17 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Finelined pocketbook Lampsilis altilis AL, GA, TN I Threatened Finerayed pigtoe Fusconaia cuneolus AL, TN, VA I Endangered Fish Slough milk

vetch Astragalus lentiginosus var. piscinensis CA P Threatened

Flat pebblesnail Lepyrium showalteri AL I Endangered Flat pigtoe Pleurobema marshalli AL, MS I Endangered
Flat

- spired three

toothed Snail Triodopsis platysayoides WV I Threatened

Flattened musk turtle Sternotherus depressus AL V Threatened

Fleshy owl's

- clover Castilleja campestris ssp. succulenta CA P Threatened

Florida bonamia Bonamia grandiflora FL P Threatened Florida golden aster Chrysopsis floridana FL P Endangered Florida grasshopper

sparrow Ammodramus savannarum floridanus FL V Endangered

Florida panther Puma (=Felis) concolor coryi FL V Endangered Florida perforate cladonia Cladonia perforata FL P Endangered

Florida salt marsh vole Microtus pennsylvanicus dukecampbelli FL V Endangered

Florida scrub

- jay Aphelocoma coerulescens FL V Threatened Florida skullcap Scutellaria floridana FL P Threatened Florida torreya Torreya taxifolia FL, GA P Endangered Florida ziziphus Ziziphus celata FL P Endangered Flying earwig Hawaiian damselfly Megalagrion nesiotes HI I Endangered

Fosberg's love grass Eragrostis fosbergii HI P Endangered Foskett speckled dace Rhinichthys osculus ssp. OR V Threatened
Fountain darter Etheostoma fonticola TX V Endangered

Fountain thistle Cirsium fontinale var. fontinale CA P Endangered

Four

- petal pawpaw Asimina tetramera FL P Endangered

Fragrant prickly

- apple Cereus eriophorus var. fragrans FL P EndangeredA

- 18 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Fresno kangaroo rat Dipodomys nitratoides exilis CA V Endangered Fringed campion Silene polypetala FL, GA P Endangered
Frosted Flatwoods salamander Ambystoma cingulatum FL, GA, SC V Threatened

Furbish lousewort Pedicularis furbishiae ME P Endangered

Fuzzy pigtoe Pleurobema strodeanum AL, FL I Proposed Threatened
Gambel's watercress Rorippa gambellii CA P Endangered Garber's spurge Chamaesyce garberi FL P Threatened
Garrett's mint Dicerandra christmanii FL P Endangered

Gaviota tarplant Deinandra increscens ssp. villosa CA P Endangered

Gentian pinkroot Spigelia gentianoides AL, FL P Endangered Gentner's fritillary Fritillaria gentneri CA, OR P Endangered Georgia pigtoe Pleurobema hanleyianum AL, GA, TN I Endangered Giant garter snake Thamnophis gigas CA V Threatened Giant kangaroo rat Dipodomys ingens CA V Endangered
Gila chub Gila intermedia AZ, NM V Endangered Gila topminnow (incl. Yaqui) Poeciliopsis occidentalis AZ, NM V Endangered

Gila trout Oncorhynchus gilae AZ, NM V Threatened Godfrey's butterwort Pinguicula ionantha FL P Threatened
Golden

- cheeked warbler (=wood) Dendroica chrysoparia TX V Endangered

Golden coqui Eleutherodactylus jasperi PR V Threatened
Golden Paintbrush Castilleja levisecta OR, WA P Threatened Golden sedge Carex lutea NC P Endangered
Goldline darter Percina aurolineata AL, GA V Threatened Gopher tortoise Gopherus polyphemus AL, LA, MS V Threatened Government Canyon bat cave meshweaver Cicurina vespera TX I Endangered

Government Canyon bat cave spider Neoleptoneta microps TX I EndangeredA

- 19 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Gowen cypress Cupressus goveniana ssp. goveniana CA P Threatened

Graham beardtongue Penstemon grahamii CO, UT P Proposed Threatened

Gray bat Myotis grisescens AL, AR, FL, GA, IL, IN, KS, KY, MO, MS, NC, OK, TN, VA, WV V Endangered

Gray wolf Canis lupus CO, MI, ND, NE, NM, NV, OR, SD, UT, WA, WI V Endangered

Greenback cutthroat

trout Oncorhynchus clarki stomias CO, UT V Threatened

Green blossom (pearlymussel) Epioblasma torulosa gubernaculum TN, VA I Endangered

Greene's tuctoria Tuctoria greenei CA P Endangered

Green pitcher

- plant Sarracenia oreophila AL, GA, NC,
TN P Endangered

Green sea turtle Chelonia mydas AL, CA, CT, DE, GA, HI, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OR, PR, RI, SC, TX, UM, VA, WA V Threatened

Green sea turtle Chelonia mydas FL V Endangered

Grizzly bear Ursus arctos horribilis ID, MT, WA,
WY V Threatened

Guadalupe fur seal Arctocephalus townsendi CA V Threatened Guajon Eleutherodactylus cooki PR V Threatened

Gulf Coast jaguarundi Herpailurus (=Felis) yagouaroundi cacomitli TX V Endangered

Gulf moccasinshell Medionidus penicillatus AL, FL, GA I EndangeredA

- 20 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Gulf sturgeon Acipenser oxyrinchus desotoi AL, FL, LA, MS V Threatened Guthrie's (=Pyne's) ground

- plum Astragalus bibullatus TN P Endangered

Gypsum wild

buckwheat Eriogonum gypsophilum NM P Threatened

Haha Cyanea acuminata HI P Endangered
Haha Cyanea asarifolia HI P Endangered

Haha Cyanea calycina HI P Proposed Endangered

Haha Cyanea copelandii ssp. copelandii HI P Endangered

Haha Cyanea copelandii ssp. haleakalaensis HI P Endangered

Haha Cyanea dolichopoda HI P Endangered
Haha Cyanea dunbarii HI P Endangered
Haha Cyanea eleeleensis HI P Endangered
Haha Cyanea glabra HI P Endangered

Haha Cyanea grimesiana ssp. grimesiana HI P Endangered

Haha Cyanea grimesiana ssp. obatae HI P Endangered

Haha Cyanea hamatiflora ssp. carlsonii HI P Endangered

Haha Cyanea hamatiflora ssp. hamatiflora HI P Endangered

Haha Cyanea humboldtiana HI P Endangered
Haha Cyanea kolekoleensis HI P Endangered
Haha Cyanea koolauensis HI P Endangered
Haha Cyanea kuhihewa HI P Endangered

Haha Cyanea lanceolata HI P Proposed Endangered
Haha Cyanea lobata HI P Endangered
Haha Cyanea longiflora HI P Endangered

Haha Cyanea macrostegia ssp. gibsonii HI P Endangered

Haha Cyanea mannii HI P EndangeredA

- 21 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Haha Cyanea mceldowneyi HI P Endangered
Haha Cyanea pinnatifida HI P Endangered
Haha Cyanea platyphylla HI P Endangered
Haha Cyanea procera HI P Endangered
Haha Cyanea recta HI P Threatened
Haha Cyanea remyi HI P Endangered
Haha Cyanea shipmanii HI P Endangered
Haha Cyanea stictophylla HI P Endangered
Haha Cyanea st.

- johnii HI P Endangered
Haha Cyanea superba HI P Endangered
Haha Cyanea truncata HI P Endangered
Haha Cyanea undulata HI P Endangered Hairy Orcutt grass Orcuttia pilosa CA P Endangered Hairy rattleweed Baptisia arachnifera GA P Endangered
Haiwale Cyrtandra paliku HI P Endangered
Ha`iwale Cyrtandra crenata HI P Endangered
Ha`iwale Cyrtandra dentata HI P Endangered
Ha`iwale Cyrtandra giffardii HI P Endangered

Ha`iwale Cyrtandra kaulantha HI P Proposed Endangered
Ha`iwale Cyrtandra limahuliensis HI P Threatened
Ha`iwale Cyrtandra munroi HI P Endangered
Ha`iwale Cyrtandra oenobarba HI P Endangered
Ha`iwale Cyrtandra polyantha HI P Endangered

Ha`iwale Cyrtandra sessilis HI P Proposed Endangered
Ha`iwale Cyrtandra subumbellata HI P Endangered
Ha`iwale Cyrtandra tintinnabula HI P Endangered
Ha`iwale Cyrtandra viridiflora HI P Endangered

Hala pepe Pleomele forbesii HI P Proposed Endangered Hala pepe Pleomele hawaiiensis HI P EndangeredA

- 22 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Harperella Ptilimnium nodosum AL, AR, GA, MD, NC, SC, VA, WV P Endangered

Harper's beauty Harperocallis flava FL P Endangered Hartweg's golden sunburst Pseudobahia bahiifolia CA P Endangered

Hau kuahiwi Hibiscadelphus giffardianus HI P Endangered
Hau kuahiwi Hibiscadelphus hualalaiensis HI P Endangered
Hau kuahiwi Hibiscadelphus woodii HI P Endangered Hawaii akepa (honeycreeper) Loxops coccineus coccineus HI V Endangered

Hawaiian (='alala) Crow Corvus hawaiiensis HI V Endangered

Hawaiian bluegrass Poa sandvicensis HI P Endangered
Hawaiian common moorhen Gallinula chloropus sandvicensis HI V Endangered

Hawaiian coot Fulica americana alai HI V Endangered
Hawaiian dark

- rumped petrel Pterodroma phaeopygia sandwichensis HI V Endangered

Hawaiian gardenia (=Na`u) Gardenia brighamii HI P Endangered

Hawaiian goose Branta (=Nesochen) sandvicensis HI V Endangered

Hawaiian hoary bat Lasiurus cinereus semotus HI V Endangered Hawaiian (=koloa) Duck Anas wyvilliana HI V Endangered

Hawaiian (='lo) Hawk Buteo solitarius HI V Endangered
Hawaiian monk seal Monachus schauinslandi NA 1 V Endangered Hawaiian picture

- wing fly Drosophila sharpi HI I Endangered

Hawaiian red

- flowered geranium Geranium arboreum HI P Endangered

Hawaiian stilt Himantopus mexicanus knudseni HI V Endangered

Hawaiian vetch Vicia menziesii HI P EndangeredA

- 23 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Hawaii creeper Oreomystis mana HI V Endangered

Hawksbill sea turtle Eretmochelys imbricata AL, CT, DE, FL, GA, HI, LA, MA, MD, ME, MS, NC, NH, NJ, NY, PR, RI, SC, TX, VA V Endangered

Hay's Spring amphipod Stygobromus hayi DC, MD I Endangered

Heau Exocarpos luteolus HI P Endangered Heavy pigtoe Pleurobema taitianum AL I Endangered
Heinroth's shearwater Puffinus heinrothi NA 1 V Threatened Heliotrope milk

- vetch Astragalus montii UT P Threatened Heller's blazingstar Liatris helleri NC P Threatened
Helotes mold beetle Batrisodes venyivi TX I Endangered Hickman's potentilla Potentilla hickmanii CA P Endangered

Hidden Lake bluecurls Trichostema austromontanum
ssp. compactum CA P Threatened

Higgins eye (pearlymussel) Lampsilis higginsii IA, IL, MN, MO, SD, WI I Endangered

Highlands scrub hypericum Hypericum cumulicola FL P Endangered

Higo Chumbo Harrisia portoricensis PR P Threatened Higuero de sierra Crescentia portoricensis PR P Endangered
Hiko White River springfish Crenichthys baileyi grandis NV V Endangered

Hilo ischaemum Ischaemum byrone HI P Endangered Hinckley oak Quercus hinckleyi TX P Threatened
Hine's emerald dragonfly Somatochlora hineana IL, MI, MO, WI I Endangered

Ho`awa Pittosporum napaliense HI P Endangered
Hoffmann's rock

- cress Arabis hoffmannii CA P Endangered
Hoffmann's slender

flowered gilia Gilia tenuiflora ssp. hoffmannii CA P Endangered

Holei Ochrosia kilaueaensis HI P EndangeredA

- 24 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Holmgren milk

- vetch Astragalus holmgreniorum AZ, UT P Endangered Holy Ghost ipomopsis Ipomopsis sancti

- spiritus NM P Endangered
Honohono Haplostachys haplostachya HI P Endangered Hoover's spurge Chamaesyce hooveri CA P Threatened Houghton's goldenrod Solidago houghtonii MI, NY P Threatened
Houston toad Bufo houstonensis TX V Endangered Howell's spectacular thelypody Thelypodium howellii spectabilis OR P Threatened

Howell's spineflower Chorizanthe howellii CA P Endangered

Huachuca water

- umbel Lilaeopsis schaffneriana var.

recurva AZ P Endangered

Hualapai Mexican vole Microtus mexicanus hualpaiensis AZ V Endangered

Hulumoa Korthalsella degeneri HI P Proposed Endangered Humpback chub Gila cypha AZ, CO, UT V Endangered

Humpback whale Megaptera novaeangliae AL, CA, DE, FL, GA, LA, MA, MD, ME, MS, NC, NJ, NY, OR, RI, SC, TX, VA, WA V Endangered

Hungerford's crawling water Beetle Brychius hungerfordi MI I Endangered

Hutton tui chub Gila bicolor ssp. OR V Threatened
Ihi`ihi Marsilea villosa HI P Endangered Illinois cave amphipod Gammarus acherondytes IL I Endangered Independence Valley speckled dace Rhinichthys osculus lethoporus NV V ndangered

Indiana bat Myotis sodalis AL, AR, FL, GA, IA, IL, IN, KY, MD, MI, MO, MS, NC, NJ, NY, OH, OK, PA, TN, VA, VT, WV V EndangeredA

- 25 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Indian Knob mountain balm Eriodictyon altissimum CA P Endangered

Interrupted (=Georgia) Rocksnail Leptoxis foremani AL, GA I Endangered

Inyo California towhee Pipilo crissalis eremophilus CA V Threatened Ione (incl. Irish Hill) buckwheat Eriogonum apricum (incl. var. prostratum) CA P Endangered

Ione manzanita Arctostaphylos myrtifolia CA P Threatened
Iowa Pleistocene snail Discus macclintocki IA, IL I Endangered Island barberry Berberis pinnata ssp. insularis CA P Endangered
Island bedstraw Galium buxifolium CA P Endangered
Island malacothrix Malacothrix squalida CA P Endangered Island night lizard Xantusia riversiana CA V Threatened

Island phacelia Phacelia insularis ssp. insularis CA P Endangered

Island rush

- rose Helianthemum greenei CA P Threatened Ivory

- billed woodpecker Campephilus principalis AR V Endangered

Jaguar Panthera onca AZ, NM V Endangered James spinymussel Pleurobema collina NC, VA, WV I Endangered

Jesup's milk

- vetch Astragalus robbinsii var. jesupi NH, VT P Endangered

Johnson's seagrass Halophila johnsonii FL P Threatened
Johnston's frankenia Frankenia johnstonii TX P Endangered Jones cycladenia Cycladenia jonesii (=humilis) AZ, UT P Threatened
June sucker Chasmistes liorus UT V Endangered
Kamakahala Labordia cyrtandrae HI P Endangered
Kamakahala Labordia helleri HI P Endangered
Kamakahala Labordia lydgatei HI P Endangered
Kamakahala Labordia pumila HI P Endangered

Kamakahala Labordia tinifolia var. lanaiensis HI P Endangered

Kamakahala Labordia tinifolia var. wahiawaensis HI P EndangeredA

- 26 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Kamakahala Labordia triflora HI P Endangered

Kamanomano Cenchrus agrimonioides HI P Endangered
Kanab ambersnail Oxyloma haydeni kanabensis AZ, UT I Endangered

Karner blue butterfly Lycaeides melissa samuelis IL, IN, MI, MN, NH, NY, OH,
WI I Endangered

Kauai akialoa (honeycreeper) Hemignathus procerus HI V Endangered

Kauai cave amphipod Spelaeorchestia koloana HI I Endangered
Kauai cave wolf or pe'e pe'e maka 'ole spider Adelocosa anops HI I Endangered

Kauai hau kuahiwi Hibiscadelphus distans HI P Endangered
Kauai `o`o (honeyeater) Moho braccatus HI V Endangered

Kauila Colubrina oppositifolia HI P Endangered
Kaulu Pteralyxia kauaiensis HI P Endangered

Kaulu Pteralyxia macrocarpa HI P Proposed Endangered Kearney's blue

- star Amsonia kearneyana AZ P Endangered
Keck's Checker

mallow Sidalcea keckii CA P Endangered

Kemp's ridley sea turtle Lepidochelys kempii AL, CT, DE, FL, GA, LA, MA, MD, MS, NC, NJ, NY, RI, SC, TX, VA V Endangered

Kendall Warm Springs dace Rhinichthys osculus thermalis WY V Endangered

Kentucky cave shrimp Palaemonias ganteri KY I Endangered
Kenwood Marsh checker

- mallow Sidalcea oregana ssp. valida CA P Endangered

Kern mallow Eremalche kernensis CA P Endangered Kern primrose sphinx moth Euproserpinus euterpe CA I ThreatenedA

- 27 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Key deer Odocoileus virginianus clavium FL V Endangered

Key Largo cotton

mouse Peromyscus gossypinus allapaticola FL V Endangered

Key Largo woodrat Neotoma floridana smalli FL V Endangered Key tree cactus Pilosocereus robinii FL P Endangered
Killer whale Orcinus orca CA, OR, WA V Endangered

Kincaid's lupine Lupinus sulphureus (=oreganus) ssp. kincaidii (=var. kincaidii) OR, WA P Threatened

Kio`ele Hedyotis coriacea HI P Endangered Kiponapona Phyllostegia racemosa HI P Endangered
Kirtland's warbler Dendroica kirtlandii FL, MI, SC, WI V Endangered
Kneeland Prairie

penny

- cress Thlaspi californicum CA P Endangered

Knieskern's beaked

rush Rhynchospora knieskernii DE, NJ P Threatened

Knowlton's cactus Pediocactus knowltonii CO, NM P Endangered
Kodachrome bladderpod Lesquerella tumulosa UT P Endangered

Kohe malama malama o kanaloa Kanaloa kahoolawensis HI P Endangered

Koki`o Kokia drynarioides HI P Endangered
Koki`o Kokia kauaiensis HI P Endangered

Koki`o ke`oke`o Hibiscus arnottianus ssp. immaculatus HI P Endangered

Koki`o ke`oke`o Hibiscus waimeae ssp. hannerae HI P Endangered

Kolea Myrsine juddii HI P Endangered
Kolea Myrsine knudsenii HI P Endangered
Kolea Myrsine linearifolia HI P Threatened
Kolea Myrsine mezii HI P Endangered

Ko`oko`olau Bidens amplectens HI P Proposed EndangeredA

- 28 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Ko`oko`olau Bidens micrantha ssp. kalealaha HI P Endangered

Ko`oko`olau Bidens wiebkei HI P Endangered
Ko`oloa`ula Abutilon menziesii HI P Endangered

Kopa Hedyotis schlechtendahliana var. remyi HI P Endangered

Kopiko Psychotria grandiflora HI P Endangered Kopiko Psychotria hobdyi HI P Endangered Koster's springsnail Juturnia kosteri NM I Endangered
Kral's water

- plantain Sagittaria secundifolia AL, GA P Threatened
Kretschmarr Cave mold beetle Texamaurops reddelli TX I Endangered

Kuahiwi laukahi Plantago hawaiensis HI P Endangered
Kuahiwi laukahi Plantago princeps HI P Endangered
Kuawawaenohu Alsinidendron lychnoides HI P Endangered Kuenzler hedgehog

cactus Echinocereus fendleri var. kuenzleri NM P Endangered

Kula wahine noho Isodendrion pyrifolium HI P Endangered
Kulu`i Nototrichium humile HI P Endangered Lacy elimia (snail) Elimia crenatella AL I Threatened
La Graciosa thistle Cirsium loncholepis CA P Endangered Laguna Beach liveforever Dudleya stolonifera CA P Threatened

Laguna Mountains skipper Pyrgus ruralis lagunae CA I Endangered

Lahontan cutthroat

trout Oncorhynchus clarki henshawi CA, NV, OR,
UT V Threatened

Lake County stonecrop Parvisedum leiocarpum CA P Endangered
Lakela's mint Dicerandra immaculata FL P Endangered Lakeside daisy Hymenoxys herbacea IL, MI, OH P Threatened
Lanai sandalwood (=`iliahi) Santalum freycinetianum var. lanaiense HI P Endangered

Lane Mountain milk

vetch Astragalus jaegerianus CA P EndangeredA

- 29 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Lange's metalmark butterfly Apodemia mormo langei CA I Endangered

Large

- flowered fiddleneck Amsinckia grandiflora CA P Endangered

Large

- flowered skullcap Scutellaria montana GA, TN P Threatened

Large

- flowered woolly meadowfoam Limnanthes floccosa ssp. grandiflora OR P Endangered

Large

- fruited sand

verbena Abronia macrocarpa TX P Endangered

Large Kauai (=kamao) thrush Myadestes myadestinus HI V Endangered

Last Chance townsendia Townsendia aprica UT P Threatened

Lau `ehu Panicum niihauense HI P Endangered
Laulihilihi Schiedea stellarioides HI P Endangered
Laurel dace Phoxinus saylori TN V Endangered Layne's butterweed Senecio layneae CA P Threatened Laysan duck Anas laysanensis HI V Endangered Laysan finch (honeycreeper) Telespyza cantans HI V Endangered

Leafy prairie

- clover Dalea foliosa AL, IL, TN P Endangered
Least Bell's vireo Vireo bellii pusillus CA V Endangered

Least tern Sterna antillarum AR, CO, IA, IL, IN, KS, KY, LA, MO, MS, MT, ND, NE, NM, OK, SD, TN, TX V Endangered

Leatherback sea turtle Dermochelys coriacea AL, CA, CT, DE, FL, GA, HI, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OR, PR, RI, SC, TX, VA, WA V EndangeredA

- 30 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Lee County cave isopod Lirceus usdagalun VA I Endangered

Leedy's roseroot Rhodiola integrifolia ssp. leedyi MN, NY P Threatened

Lee pincushion cactus Coryphantha sneedii var. leei NM P Threatened
lehua makanoe Lysimachia daphnoides HI P Endangered Leon Springs pupfish Cyprinodon bovinus TX V Endangered Leopard darter Percina pantherina AR, OK V Threatened

Lesser long

- nosed bat Leptonycteris curasoae yerbabuenae AZ, NM V Endangered

Lewton's polygala Polygala lewtonii FL P Endangered Light

- footed clapper rail Rallus longirostris levipes CA V Endangered

Liliwai Acaena exigua HI P Endangered Little Aguja (=Creek) pondweed Potamogeton clystocarpus TX P Endangered

Little amphianthus Amphianthus pusillus AL, GA, SC P Threatened
Little Colorado spinedace Lepidomeda vittata AZ V Threatened

Little Kern golden

trout Oncorhynchus aguabonita whitei CA V Threatened

Littlewing pearly

mussel Pegias fabula AL, KY, NC, TN, VA I Endangered

Lloyd's Mariposa

cactus Echinomastus mariposensis TX P Threatened

Loach minnow Tiaroga cobitis AZ, NM V Threatened Loch Lomond coyote thistle Eryngium constancei CA P Endangered

Loggerhead sea turtle Caretta caretta AL, CA, CT, DE, FL, GA, HI, LA, MA, MD, ME, MS, NC, NH, NJ, NY, OR, PR, RI, SC, TX, VA V ThreatenedA

- 31 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Loggerhead sea turtle Caretta caretta NA 1 V Threatened Lompoc yerba santa Eriodictyon capitatum CA P Endangered Longhorn fairy shrimp Branchinecta longiantenna CA I Endangered Longspurred mint Dicerandra cornutissima FL P Endangered
Lost River sucker Deltistes luxatus CA, OR V Endangered Lotis blue butterfly Lycaeides argyrognomon lotis CA I Endangered
Louisiana black bear Ursus americanus luteolus LA, MS, TX V Threatened Louisiana pearlshell Margaritifera hembeli LA I Threatened Louisiana quillwort Isoetes louisianensis AL, LA, MS P Endangered
Lo`ulu Pritchardia affinis HI P Endangered
Lo`ulu Pritchardia kaalae HI P Endangered
Lo`ulu Pritchardia munroi HI P Endangered
Lo`ulu Pritchardia napaliensis HI P Endangered
Lo`ulu Pritchardia remota HI P Endangered
Lo`ulu Pritchardia schattaueri HI P Endangered
Lo`ulu Pritchardia viscosa HI P Endangered Lower Keys marsh rabbit Sylvilagus palustris hefneri FL V Endangered

Lyon's pentachaeta Pentachaeta lyonii CA P Endangered Lyrate bladderpod Lesquerella lyrata AL P Threatened
MacFarlane's four

o'clock Mirabilis macfarlanei ID, OR P Threatened

Madison Cave isopod Antrolana lira VA, WV I Threatened
Madla's Cave meshweaver Cicurina madla TX I Endangered

Magazine Mountain shagreen Mesodon magazinensis AR I Threatened

Maguire primrose Primula maguirei UT P Threatened
Mahoe Alectryon macrococcus HI P Endangered
Makou Peucedanum sandwicense HI P Threatened
Malheur wire

- lettuce Stephanomeria malheurensis OR P Endangered
Mancos milk

- vetch Astragalus humillimus CO, NM P Endangered Mann's bluegrass Poa mannii HI P EndangeredA

- 32 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Many

- flowered navarretia Navarretia leucocephala ssp. plieantha CA P Endangered

Ma`oli`oli Schiedea apokremnos HI P Endangered
Ma`oli`oli Schiedea kealiae HI P Endangered Mapele Cyrtandra cyaneoides HI P Endangered
Marbled murrelet Brachyramphus marmoratus CA, OR, WA V Threatened

Marcescent dudleya Dudleya cymosa ssp.

marcescens CA P Threatened

Marin dwarf

- flax Hesperolinon congestum CA P Threatened Mariposa pussypaws Calyptridium pulchellum CA P Threatened
Marsh Sandwort Arenaria paludicola CA P Endangered Maryland darter Etheostoma sellare MD V Endangered
Masked bobwhite (quail) Colinus virginianus ridgwayi AZ V Endangered

Mat

- forming quillwort Isoetes tegetiformans GA P Endangered Maui akepa (honeycreeper) Loxops coccineus ochraceus HI V Endangered

Maui parrotbill (honeycreeper) Pseudonestor xanthophrys HI V Endangered

Maui remya Remya mauiensis HI P Endangered Mauna Loa (=Ka'u) silversword Argyroxiphium kauense HI P Endangered

McDonald's rock

- cress Arabis macdonaldiana CA, OR P Endangered

Mead's milkweed Asclepias meadii IA, IL, IN, KS, MO, WI P Threatened

Mehamehame Flueggea neowawraea HI P Endangered
Menzies' wallflower Erysimum menziesii CA P Endangered
Mesa Verde cactus Sclerocactus mesae

- verdae CO, NM P Threatened Metcalf Canyon jewelflower Streptanthus albidus ssp. albidus CA P Endangered

Mexican flannelbush Fremontodendron mexicanum CA P Endangered Mexican long

- nosed bat Leptonycteris nivalis NM, TX V Endangered

Mexican spotted owl Strix occidentalis lucida AZ, CO, NM, TX, UT V ThreatenedA

- 33 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Miami blue butterfly Cyclargus (=Hemiargus) thomasi bethunebakeri FL I Endangered

Miccosukee gooseberry Ribes echinellum FL, SC P Threatened

Michaux's sumac Rhus michauxii GA, NC, SC, VA P Endangered

Michigan monkey

flower Mimulus michiganensis MI P Endangered

Minnesota dwarf trout lily Erythronium propullans MN P Endangered

Mission blue butterfly Icaricia icarioides
missionensis CA I Endangered

Mississippi gopher frog Rana capito sevosa MS V Endangered

Mississippi sandhill

crane Grus canadensis pulla MS V Endangered

Missouri bladderpod Physaria filiformis AR, MO P Threatened Mitchell's satyr butterfly Neonympha mitchellii mitchellii AL, IN, MI, MS, OH, VA I Endangered

Moapa dace Moapa coriacea NV V Endangered
Modoc sucker Catostomus microps CA, OR V Endangered
Mohave tui chub Gila bicolor mohavensis CA V Endangered
Mohr's Barbara button Marshallia mohrii AL, GA P Threatened Molokai creeper Paroreomyza flammea HI V Endangered
Molokai thrush Myadestes lanaiensis rutha HI V Endangered
Mona boa Epicrates monensis monensis PR V Threatened Mona ground iguana Cyclura cornuta stejnegeri PR V Threatened Monito gecko Sphaerodactylus micropithecus PR V Endangered Monterey clover Trifolium trichocalyx CA P Endangered Monterey gilia Gilia tenuiflora ssp. arenaria CA P Endangered

Monterey spineflower Chorizanthe pungens var.

pungens CA P Threatened

Morefield's leather flower Clematis morefieldii AL, TN P EndangeredA

- 34 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Morro Bay kangaroo

rat Dipodomys heermanni
morroensis CA V Endangered

Morro manzanita Arctostaphylos morroensis CA P Threatened
Morro shoulderband (=Banded dune) snail Helminthoglypta walkeriana CA I Endangered

Mountain golden heather Hudsonia montana NC P Threatened

Mountain sweet pitcher

- plant Sarracenia rubra ssp. jonesii NC, SC P Endangered

Mountain yellow

legged frog Rana muscosa CA V Endangered

Mount Graham red squirrel Tamiasciurus hudsonicus grahamensis AZ V Endangered

Mount Hermon june beetle Polyphylla barbata CA I Endangered

Munz's onion Allium munzii CA P Endangered Myrtle's silverspot butterfly Speyeria zerene myrtleae CA I Endangered

Naenae Dubautia kalalauensis HI P Endangered

Naenae Dubautia kenwoodii HI P Endangered
Na`ena`e Dubautia herbstobatae HI P Endangered
Na`ena`e Dubautia imbricata imbricata HI P Endangered
Na`ena`e Dubautia latifolia HI P Endangered
Na`ena`e Dubautia pauciflorula HI P Endangered

Na`ena`e Dubautia plantaginea magnifolia HI P Endangered

Na`ena`e Dubautia plantaginea ssp. humilis HI P Endangered

Na`ena`e Dubautia waialealae HI P Endangered (=Na`ena`e) lo`ulu Pritchardia hardyi HI P Endangered

Nani wai`ale`ale Viola kauaiensis var. wahiawaensis HI P Endangered

Nanu Gardenia mannii HI P Endangered Napa bluegrass Poa napensis CA P Endangered Na Pali beach hedyotis Hedyotis st.

- johnii HI P EndangeredA

- 35 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Narrow pigtoe Fusconaia escambia AL, FL I Proposed Threatened Nashville crayfish Orconectes shoupi TN I Endangered (=Native yellow hibiscus) ma`o hau hele Hibiscus brackenridgei HI P Endangered

Navajo sedge Carex specuicola AZ, UT P Threatened
Navasota ladies'

- tresses Spiranthes parksii TX P Endangered

Nehe Lipochaeta fauriei HI P Endangered
Nehe Lipochaeta kamolensis HI P Endangered

Nehe Lipochaeta lobata var. leptophylla HI P Endangered

Nehe Lipochaeta micrantha HI P Endangered
Nehe Lipochaeta tenuifolia HI P Endangered
Nehe Lipochaeta waimeaensis HI P Endangered Nellie cory cactus Coryphantha minima TX P Endangered
Nelson's checker

mallow Sidalcea nelsoniana OR, WA P Threatened

Neosho madtom Noturus placidus KS, MO, OK V Threatened Nevin's barberry Berberis nevinii CA P Endangered
Newcomb's snail Erinna newcombi HI I Threatened
Newell's Townsend's shearwater Puffinus auricularis newelli HI V Threatened

New Mexican ridge

nosed rattlesnake Crotalus willardi obscurus AZ, NM V Threatened

Niangua darter Etheostoma nianguae MO V Threatened
Nichol's Turk's head

cactus Echinocactus horizonthalonius var. nicholii AZ P Endangered

Nihoa finch (honeycreeper) Telespyza ultima HI V Endangered

Nihoa millerbird (old world warbler) A crocephalus familiaris kingi HI V Endangered

Nioi Eugenia koolauensis HI P Endangered Nipomo Mesa lupine Lupinus nipomensis CA P EndangeredA

- 36 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

No common name Abutilon eremitopetalum HI P Endangered

No common name Abutilon sandwicense HI P Endangered

No common name Achyranthes mutica HI P Endangered

No common name Adiantum vivesii PR P Endangered

No common name Alsinidendron obovatum HI P Endangered

No common name Alsinidendron trinerve HI P Endangered

No common name Alsinidendron viscosum HI P Endangered

No common name Amaranthus brownii HI P Endangered

No common name Aristida chaseae PR P Endangered

No common name Asplenium fragile var. insulare HI P Endangered

No common name Auerodendron pauciflorum PR P Endangered

No common name Bonamia menziesii HI P Endangered

No common name Calyptranthes thomasiana PR P Endangered

No common name Catesbaea melanocarpa PR P Endangered

No common name Chamaecrista glandulosa var. mirabilis PR P Endangered

No common name Chamaesyce halemanui HI P Endangered

No common name Cordia bellonis PR P Endangered

No common name Cranichis ricartii PR P Endangered

No common name Cyanea purpurellifolia HI P Proposed Endangered

No common name Cyanea (=Rollandia) crispa HI P Endangered

No common name Cyrtandra gracilis HI P Proposed Endangered

No common name Cyrtandra waiolani HI P Proposed Endangered

No common name Daphnopsis hellerana PR P Endangered

No common name Delissea rhytidosperma HI P Endangered

No common name Delissea undulata HI P Endangered

No common name Diellia falcata HI P Endangered

No common name Diellia mannii HI P Endangered

No common name Diellia pallida HI P Endangered

No common name Diellia unisora HI P Endangered

No common name Diplazium molokaiense HI P EndangeredA

- 37 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

No common name Doryopteris angelica HI P Endangered

No common name Doryopteris takeuchii HI P Proposed Endangered

No common name Elaphoglossum serpens PR P Endangered

No common name Eugenia woodburyana PR P Endangered

No common name Gahnia lanaiensis HI P Endangered

No common name Geocarpon minimum AR, LA, MO,
TX P Threatened

No common name Gesneria pauciflora PR P Threatened

No common name Gouania hillebrandii HI P Endangered

No common name Gouania meyenii HI P Endangered

No common name Gouania vitifolia HI P Endangered

No common name Hedyotis degeneri HI P Endangered

No common name Hedyotis parvula HI P Endangered

No common name Hesperomannia arborescens HI P Endangered

No common name Hesperomannia arbuscula HI P Endangered

No common name Hesperomannia lydgatei HI P Endangered

No common name Ilex sintenisii PR P Endangered

No common name Keysseria (=Lagenifera) erici HI P Endangered

No common name Keysseria (=Lagenifera) helenae HI P Endangered

No common name Lepanthes eltoroensis PR P Endangered

No common name Leptocereus grantianus PR P Endangered

No common name Lipochaeta venosa HI P Endangered

No common name Lobelia gaudichaudii ssp. koolauensis HI P Endangered

No common name Lobelia monostachya HI P Endangered

No common name Lobelia niihauensis HI P Endangered

No common name Lobelia oahuensis HI P Endangered

No common name Lyonia truncata var. proctorii PR P Endangered

No common name Lysimachia filifolia HI P Endangered

No common name Lysimachia iniki HI P Endangered

No common name Lysimachia lydgatei HI P Endangered

No common name Lysimachia maxima HI P EndangeredA

- 38 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

No common name Lysimachia pendens HI P Endangered

No common name Lysimachia scopulensis HI P Endangered

No common name Lysimachia venosa HI P Endangered

No common name Mariscus fauriei HI P Endangered

No common name Mariscus pennatiformis HI P Endangered

No common name Mitracarpus maxwelliae PR P Endangered

No common name Mitracarpus polycladus PR P Endangered

No common name Munroidendron racemosum HI P Endangered

No common name Myrcia paganii PR P Endangered

No common name Neraudia angulata HI P Endangered

No common name Neraudia ovata HI P Endangered

No common name Neraudia sericea HI P Endangered

No common name Phyllostegia glabra var. lanaiensis HI P Endangered

No common name Phyllostegia hirsuta HI P Endangered

No common name Phyllostegia hispida HI P Endangered

No common name Phyllostegia kaalaensis HI P Endangered

No common name Phyllostegia knudsenii HI P Endangered

No common name Phyllostegia mannii HI P Endangered

No common name Phyllostegia mollis HI P Endangered

No common name Phyllostegia parviflora HI P Endangered

No common name Phyllostegia renovans HI P Endangered

No common name Phyllostegia velutina HI P Endangered

No common name Phyllostegia waimeae HI P Endangered

No common name Phyllostegia warshaueri HI P Endangered

No common name Phyllostegia wawrana HI P Endangered

No common name Platanthera holochila HI P Endangered

No common name Platydesma cornuta cornuta HI P Proposed Endangered

No common name Platydesma cornuta decurrens HI P Proposed Endangered

No common name Poa siphonoglossa HI P Endangered

No common name Polystichum calderonense PR P Endangered

No common name Pteris lidgatei HI P EndangeredA

- 39 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

No common name Remya kauaiensis HI P Endangered

No common name Remya montgomeryi HI P Endangered

No common name Sanicula mariversa HI P Endangered

No common name Sanicula purpurea HI P Endangered

No common name Schiedea attenuata HI P Endangered

No common name Schiedea haleakalensis HI P Endangered

No common name Schiedea helleri HI P Endangered

No common name Schiedea hookeri HI P Endangered

No common name Schiedea kaalae HI P Endangered

No common name Schiedea kauaiensis HI P Endangered

No common name Schiedea lydgatei HI P Endangered

No common name Schiedea membranacea HI P Endangered

No common name Schiedea nuttallii HI P Endangered

No common name Schiedea sarmentosa HI P Endangered

No common name Schiedea spergulina var. leiopoda HI P Endangered

No common name Schiedea spergulina var. spergulina HI P Threatened

No common name Schiedea verticillata HI P Endangered

No common name Schoepfia arenaria PR P Threatened

No common name Silene alexandri HI P Endangered

No common name Silene hawaiiensis HI P Threatened

No common name Silene lanceolata HI P Endangered

No common name Silene perlmanii HI P Endangered

No common name Spermolepis hawaiiensis HI P Endangered

No common name Stenogyne angustifolia angustifolia HI P Endangered

No common name Stenogyne bifida HI P Endangered

No common name Stenogyne campanulata HI P Endangered

No common name Stenogyne kanehoana HI P Endangered

No common name Stenogyne kealiae HI P Endangered

No common name Tectaria estremerana PR P Endangered

No common name Ternstroemia subsessilis PR P Endangered

No common name Tetramolopium arenarium HI P EndangeredA

- 40 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

No common name Tetramolopium filiforme HI P Endangered

No common name Tetramolopium lepidotum ssp. lepidotum HI P Endangered

No common name Tetramolopium remyi HI P Endangered

No common name Tetramolopium rockii HI P Threatened

No common name Tetraplasandra bisattenuata HI P Endangered

No common name Tetraplasandra flynnii HI P Endangered

No common name Tetraplasandra lydgatei HI P Proposed Endangered

No common name Thelypteris inabonensis PR P Endangered

No common name Thelypteris verecunda PR P Endangered

No common name Thelypteris yaucoensis PR P Endangered

No common name Trematolobelia singularis HI P Endangered

No common name Vernonia proctorii PR P Endangered

No common name Vigna o

- wahuensis HI P Endangered

No common name Viola helenae HI P Endangered

No common name Viola lanaiensis HI P Endangered

No common name Viola oahuensis HI P Endangered

No common name Xylosma crenatum HI P Endangered Noel's amphipod Gammarus desperatus NM I Endangered
Nohoanu Geranium kauaiense HI P Endangered
Nohoanu Geranium multiflorum HI P Endangered Noonday snail Mesodon clarki nantahala NC I Threatened North American green sturgeon Acipenser medirostris CA, OR, WA V Threatened

North Atlantic right whale Eubalaena glacialis CT, DE, FL, GA, MA, MD, ME, NC, NJ, NY, RI, SC, VA V Endangered

Northeastern beach tiger beetle Cicindela dorsalis dorsalis MA, MD, NJ, VA I Threatened

Northeastern bulrush Scirpus ancistrochaetus MA, MD, NH, NY, PA, VA, VT, WV P EndangeredA

- 41 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Northern aplomado falcon Falco femoralis septentrionalis TX V Endangered

Northern Idaho ground squirrel Spermophilus brunneus brunneus ID V Threatened

Northern riffleshell Epioblasma torulosa rangiana IN, KY, MI, OH, PA, WV I Endangered

Northern spotted owl Strix occidentalis caurina CA, OR, WA V Threatened
Northern wild monkshood Aconitum noveboracense IA, NY, OH, WI P Threatened

North Pacific right whale Eubalaena japonica NA 1 V Endangered

North Park phacelia Phacelia formosula CO P Endangered Nukupu`u (honeycreeper) Hemignathus lucidus HI V Endangered

Oahu creeper Paroreomyza maculata HI V Endangered

Oahu elepaio Chasiempis sandwichensis ibidis HI V Endangered

Oahu tree snails Achatinella spp. HI I Endangered
Oahu wild coffee (=kopiko) Psychotria hexandra ssp. oahuensis var. oahuensis HI P Proposed Endangered
Oceanic Hawaiian damselfly Megalagrion oceanicum HI I Proposed dangered
Ocelot Leopardus (=Felis) pardalis AZ, TX V Endangered
Ochlockonee moccasinshell Medionidus simpsonianus FL, GA I Endangered

Oha Delissea rivularis HI P Endangered
Oha Delissea subcordata HI P Endangered
Ohai Sesbania tomentosa HI P Endangered
`Oha wai Clermontia drepanomorpha HI P Endangered
`Oha wai Clermontia lindseyana HI P Endangered

`Oha wai Clermontia oblongifolia ssp. brevipes HI P Endangered

`Oha wai Clermontia oblongifolia ssp.
mauiensis HI P Endangered

`Oha wai Clermontia peleana HI P EndangeredA

- 42 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

`Oha wai Clermontia pyrularia HI P Endangered
`Oha wai Clermontia samuelii HI P Endangered
`Ohe`ohe Tetraplasandra gymnocarpa HI P Endangered Ohlone tiger beetle Cicindela ohlone CA I Endangered
Okaloosa darter Etheostoma okaloosae FL V Threatened

Okeechobee gourd Cucurbita okeechobeensis ssp. okeechobeensis FL P Endangered

Olive ridley sea turtle Lepidochelys olivacea CA, HI V Threatened
Olulu Brighamia insignis HI P Endangered Opuhe Urera kaalae HI P Endangered Orangefoot pimpleback (pearlymussel) Plethobasus cooperianus AL, IL, IN, KY, PA, TN I Endangered

Orangenacre mucket Lampsilis perovalis AL, MS I Threatened Orcutt's spineflower Chorizanthe orcuttiana CA P Endangered Oregon chub Oregonichthys crameri OR V Threatened Oregon silverspot butterfly Speyeria zerene hippolyta CA, OR I Threatened

Osterhout milk

- vetch Astragalus osterhoutii CO P Endangered Otay mesa

- mint Pogogyne nudiuscula CA P Endangered

Otay tarplant Deinandra (=Hemizonia) conjugens CA P Threatened

Ouachita rock pocketbook Arkansia wheeleri AR, OK I Endangered

`O`u (honeycreeper) Psittirostra psittacea HI V Endangered Oval pigtoe Pleurobema pyriforme AL, FL, GA I Endangered
Ovate clubshell Pleurobema perovatum AL, MS, TN I Endangered Owens pupfish Cyprinodon radiosus CA V Endangered
Owens tui chub Gila bicolor ssp. snyderi CA V Endangered

Oyster mussel Epioblasma capsaeformis AL, KY, TN, VA I Endangered

Ozark big

- eared bat Corynorhinus (=Plecotus) townsendii ingens AR, MO, OK V Endangered

Ozark cavefish Amblyopsis rosae AR, MO, OK V ThreatenedA

- 43 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Ozark hellbender Cryptobranchus alleganiensis bishopi AR, MO V Endangered

Pacific eulachon Thaleichthys pacificus NA 1 V Threatened
Pacific Hawaiian damselfly Megalagrion pacificum HI I Endangered

Pacific pocket mouse Perognathus longimembris pacificus CA V Endangered

Pagosa skyrocket Ipomopsis polyantha CO P Endangered Pahranagat roundtail chub Gila robusta jordani NV V Endangered

Pahrump poolfish Empetrichthys latos NV V Endangered
Pa`iniu Astelia waialealae HI P Endangered
Painted rocksnail Leptoxis taeniata AL I Threatened
Painted snake coiled forest snail Anguispira picta TN I Threatened

Paiute cutthroat trout Oncorhynchus clarki seleniris CA V Threatened

Palapalai aumakua Dryopteris crinalis var. podosorus HI P Endangered

Pale lilliput (pearlymussel) Toxolasma cylindrellus AL, TN I Endangered

Palezone shiner Notropis albizonatus AL, KY V Endangered Palila (honeycreeper) Loxioides bailleui HI V Endangered
Pallid manzanita Arctostaphylos pallida CA P Threatened

Pallid sturgeon Scaphirhynchus albus AR, IA, IL, KS, KY, LA, MO, MS, MT, ND, NE, SD, TN V Endangered

Palma de manaca Calyptronoma rivalis PR P Threatened
Palmate

- bracted bird's beak Cordylanthus palmatus CA P Endangered

Palo colorado Ternstroemia luquillensis PR P Endangered Palo de jazmin Styrax portoricensis PR P Endangered Palo de nigua Cornutia obovata PR P Endangered
Palo de ramon Banara vanderbiltii PR P Endangered
Palo de rosa Ottoschulzia rhodoxylon PR P EndangeredA

- 44 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Palos Verdes blue butterfly Glaucopsyche lygdamus palosverdesensis CA I Endangered

Pamakani Tetramolopium capillare HI P Endangered

Pamakani Viola chamissoniana ssp. chamissoniana HI P Endangered

Papala Charpentiera densiflora HI P Endangered Papery whitlow

- wort Paronychia chartacea FL P Threatened Parachute beardtongue Penstemon debilis CO P Threatened
Pariette cactus Sclerocactus brevispinus UT P Threatened Parish's daisy Erigeron parishii CA P Threatened

Pauoa Ctenitis squamigera HI P Endangered

Pawnee montane skipper Hesperia leonardus montana CO I Threatened

Peck's cave amphipod Stygobromus (=Stygonectes) pecki TX I Endangered

Pecos assiminea snail Assiminea pecos NM, TX I Endangered
Pecos bluntnose shiner Notropis simus pecosensis NM V Threatened Pecos gambusia Gambusia nobilis NM, TX V Endangered Pecos (=puzzle, =paradox) sunflower Helianthus paradoxus NM, TX P Threatened

Pedate checker

- mallow Sidalcea pedata CA P Endangered

Peebles Navajo cactus Pediocactus peeblesianus var. peeblesianus AZ P Endangered

Peirson's milk

- vetch Astragalus magdalenae var. peirsonii CA P Threatened

Pelos del diablo Aristida portoricensis PR P Endangered
Pendant kihi fern Adenophorus periens HI P Endangered Peninsular bighorn sheep Ovis canadensis nelsoni CA V Endangered

Penland alpine fen mustard Eutrema penlandii CO P Threatened

Penland beardtongue Penstemon penlandii CO P Endangered

Pennell's bird's

- beak Cordylanthus tenuis ssp. capillaris CA P EndangeredA

- 45 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Perdido Key beach

mouse Peromyscus polionotus trissyllepsis AL, FL V Endangered

Persistent trillium Trillium persistens GA, SC P Endangered
Peter's Mountain mallow Iliamna corei VA P Endangered

Pigeon wings Clitoria fragrans FL P Threatened
Pilo Hedyotis mannii HI P Endangered
Pilo kea lau li`i Platydesma rostrata HI P Endangered

Pima pineapple cactus Coryphantha scheeri var. robustispina AZ P Endangered

Pine Hill ceanothus Ceanothus roderickii CA P Endangered

Pine Hill flannelbush Fremontodendron californicum ssp. decumbens CA P Endangered

Pink mucket (pearlymussel) Lampsilis abrupta AL, AR, IL, IN, KY, LA, MO, OH, PA, TN, VA, WV I Endangered

Piping plover Charadrius melodus AL, AR, CO, CT, DE, FL, IA, KS, LA, MA, MD, ME, MT, NC, ND, NE, NH, NJ, NM, NY, OK, RI, SC, SD, TX, VA V Threatened

Piping plover Charadrius melodus IL, IN, MI, MN, MS, NY, OH, PA, WI V Endangered

Pismo clarkia Clarkia speciosa ssp. immaculata CA P Endangered

Pitcher's thistle Cirsium pitcheri IL, IN, MI, WI P Threatened

Pitkin marsh lily Lilium pardalinum ssp. pitkinense CA P Endangered

Plicate rocksnail Leptoxis plicata AL I Endangered Plymouth red

- bellied turtle Pseudemys rubriventris bangsi MA V EndangeredA

- 46 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Po`e Portulaca sclerocarpa HI P Endangered
Point Arena mountain beaver Aplodontia rufa nigra CA V Endangered

Pondberry Lindera melissifolia AL, AR, GA, MO, MS, NC, SC P Endangered

Po`ouli (honeycreeper) Melamprosops phaeosoma HI V Endangered Popolo ku mai Solanum incompletum HI P Endangered
Prairie bush

- clover Lespedeza leptostachya IA, IL, MN, WI P Threatened
Preble's meadow jumping mouse Zapus hudsonius preblei CO, WY V Threatened

Presidio clarkia Clarkia franciscana CA P Endangered

Presidio manzanita Arctostaphylos hookeri var.
ravenii CA P Endangered

Price's potato

- bean Apios priceana AL, IL, KY, MS, TN P Threatened

Pua `ala Brighamia rockii HI P Endangered
Puerto Rican boa Epicrates inornatus PR V Endangered
Puerto Rican broad

winged hawk Buteo platypterus brunnescens PR V Endangered

Puerto Rican crested toad Peltophryne lemur PR V Threatened

Puerto Rican nightjar Caprimulgus noctitherus PR V Endangered Puerto Rican parrot Amazona vittata PR V Endangered Puerto Rican plain Pigeon Columba inornata wetmorei PR V Endangered

Puerto Rican sharp

shinned hawk Accipiter striatus venator PR V Endangered

Puritan tiger beetle Cicindela puritana CT, MA, MD I Threatened Purple amole Chlorogalum purpureum CA P Threatened Purple bankclimber (mussel) Elliptoideus sloatianus AL, FL, GA I Threatened

Purple bean Villosa perpurpurea TN, VA I EndangeredA

- 47 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

purple cat's paw (=purple cat's paw pearlymussel) Epioblasma obliquata obliquata AL, KY, OH,
TN I Endangered

Pu`uka`a Cyperus trachysanthos HI P Endangered Pygmy fringe

- tree Chionanthus pygmaeus FL P Endangered Pygmy madtom Noturus stanauli TN V Endangered Pygmy rabbit Brachylagus idahoensis WA V Endangered Pygmy sculpin Cottus paulus (=pygmaeus) AL V Threatened Quino checkerspot butterfly Euphydryas editha quino (=E. e. wrighti) CA I Endangered

Railroad Valley springfish Crenichthys nevadae NV V Threatened

Rayed bean Villosa fabalis IN, MI, NY, OH, PA, VA I Endangered

Razorback sucker Xyrauchen texanus AZ, CA, CO, NM, NV, UT V Endangered

Red

- cockaded woodpecker Picoides borealis AL, AR, FL, GA, LA, MO, MS, NC, OK, SC, TX, VA V Endangered

Red Hills salamander Phaeognathus hubrichti AL V Threatened
Red Hills vervain Verbena californica CA P Threatened
Red wolf Canis rufus FL, NC, SC V Endangered
Relict darter Etheostoma chienense KY V Endangered
Relict trillium Trillium reliquum AL, GA, SC P Endangered
Reticulated flatwoods salamander Ambystoma bishopi FL, GA V Endangered

Rice rat Oryzomys palustris natator FL V Endangered Ringed map turtle Graptemys oculifera LA, MS V Threatened

Ring pink (mussel) Obovaria retusa AL, KY, PA,
TN I Endangered

Rio Grande silvery minnow Hybognathus amarus NM V Endangered

Riparian brush rabbit Sylvilagus bachmani riparius CA V EndangeredA

- 48 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Riparian woodrat (=San Joaquin Valley) Neotoma fuscipes riparia CA V Endangered

Riverside fairy shrimp Streptocephalus woottoni CA I Endangered

Roan Mountain bluet Hedyotis purpurea var.
montana NC, TN P Endangered

Roanoke logperch Percina rex VA V Endangered
Robber Baron cave meshweaver Cicurina baronia TX I Endangered

Robust (incl. Scotts Valley) spineflower Chorizanthe robusta (incl. vars. robusta and hartwegii) CA P Endangered

Rock gnome lichen Gymnoderma lineare NC, SC, TN, VA P Endangered

Roseate tern Sterna dougallii dougallii CT, MA, ME, NC, NH, NJ, NY, RI, VA V Endangered

Roseate tern Sterna dougallii dougallii FL, NC, PR, SC V Threatened Roswell springsnail Pyrgulopsis roswellensis NM I Endangered Rough hornsnail Pleurocera foremani AL I Endangered Rough

- leaved loosestrife Lysimachia asperulaefolia NC, SC P Endangered

Rough pigtoe Pleurobema plenum AL, IN, KY, PA, TN, VA I Endangered

rough popcornflower Plagiobothrys hirtus OR P Endangered Rough rabbitsfoot Quadrula cylindrica strigillata TN, VA I Endangered

Round Ebonyshell Fusconaia rotulata AL, FL I Proposed Endangered
Round

- leaved chaff

flower Achyranthes splendens var. rotundata HI P Endangered

Round rocksnail Leptoxis ampla AL I Threatened Royal marstonia (snail) Pyrgulopsis ogmorhaphe TN I Endangered Rugel's pawpaw Deeringothamnus rugelii FL P Endangered

Running buffalo clover Trifolium stoloniferum AR, IN, KY, MO, OH, WV P Endangered

Rush darter Etheostoma phytophilum AL V Endangered Ruth's golden aster Pityopsis ruthii TN P EndangeredA

- 49 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Sacramento Mountains thistle Cirsium vinaceum NM P Threatened

Sacramento Orcutt

grass Orcuttia viscida CA P Endangered

Sacramento prickly

poppy Argemone pleiacantha ssp. pinnatisecta NM P Endangered

Saint Francis' satyr butterfly Neonympha mitchellii francisci NC I Endangered

Salt Creek tiger beetle Cicindela nevadica lincolniana NE I Endangered

Salt marsh bird's

- beak Cordylanthus maritimus ssp.
maritimus CA P Endangered

Salt marsh harvest

mouse Reithrodontomys raviventris CA V Endangered

San Benito evening

primrose Camissonia benitensis CA P Threatened

San Bernardino bluegrass Poa atropurpurea CA P Endangered

San Bernardino Merriam's kangaroo rat Dipodomys merriami parvus CA V Endangered

San Bernardino Mountains bladderpod Lesquerella kingii ssp. bernardina CA P Endangered

San Bernardino springsnail Pyrgulopsis bernardina AZ I Proposed Endangered
San Bruno elfin butterfly Callophrys mossii bayensis CA I Endangered

San Clemente Island broom Lotus dendroideus ssp. traskiae CA P Endangered

San Clemente Island bush

- mallow Malacothamnus clementinus CA P Endangered

San Clemente Island indian paintbrush Castilleja grisea CA P Endangered

San Clemente Island larkspur Delphinium variegatum ssp. kinkiense CA P Endangered

San Clemente Island woodland

- star Lithophragma maximum CA P EndangeredA

- 50 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

San Clemente loggerhead shrike Lanius ludovicianus mearnsi CA V Endangered

San Clemente sage

sparrow Amphispiza belli clementeae CA V Threatened

San Diego ambrosia Ambrosia pumila CA P Endangered San Diego button

celery Eryngium aristulatum var. parishii CA P Endangered

San Diego fairy shrimp Branchinecta sandiegonensis CA I Endangered

San Diego mesa

- mint Pogogyne abramsii CA P Endangered San Diego thornmint Acanthomintha ilicifolia CA P Threatened
Sandlace Polygonella myriophylla FL P Endangered

Sandplain gerardia Agalinis acuta CT, MA, MD, NY, RI P Endangered

Sand skink Neoseps reynoldsi FL V Threatened San Francisco garter snake Thamnophis sirtalis
tetrataenia CA V Endangered

San Francisco lessingia Lessingia germanorum (=L.g. var. germanorum) CA P Endangered

San Francisco manzanita Arctostaphylos franciscana CA P Proposed Endangered
San Francisco Peaks groundsel Senecio franciscanus AZ P Threatened

San Jacinto Valley crownscale Atriplex coronata var. notatior CA P Endangered

San Joaquin adobe sunburst Pseudobahia peirsonii CA P Threatened

San Joaquin kit fox Vulpes macrotis mutica CA V Endangered San Joaquin Orcutt

grass Orcuttia inaequalis CA P Threatened

San Joaquin wooly

threads Monolopia (=Lembertia) congdonii CA P Endangered

San Marcos gambusia Gambusia georgei TX V Endangered
San Marcos salamander Eurycea nana TX V ThreatenedA

- 51 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

San Mateo thornmint Acanthomintha obovata ssp. duttonii CA P Endangered

San Mateo woolly sunflower Eriophyllum latilobum CA P Endangered

San Miguel Island fox Urocyon littoralis littoralis CA V Endangered
San Rafael cactus Pediocactus despainii UT P Endangered
Santa Ana River woolly

- star Eriastrum densifolium ssp.

sanctorum CA P Endangered

Santa Ana sucker Catostomus santaanae CA V Threatened
Santa Barbara Island liveforever Dudleya traskiae CA P Endangered

Santa Catalina Island fox Urocyon littoralis catalinae CA V Endangered

Santa Clara Valley dudleya Dudleya setchellii CA P Endangered

Santa Cruz cypress Cupressus abramsiana CA P Endangered
Santa Cruz Island bush

mallow Malacothamnus fasciculatus
var. nesioticus CA P Endangered

Santa Cruz Island dudleya Dudleya nesiotica CA P Threatened

Santa Cruz Island fox Urocyon littoralis santacruzae CA V Endangered
Santa Cruz Island fringepod Thysanocarpus conchuliferus CA P Endangered

Santa Cruz Island malacothrix Malacothrix indecora CA P Endangered

Santa Cruz Island rockcress Sibara filifolia CA P Endangered

Santa Cruz long

- toed salamander Ambystoma macrodactylum

croceum CA V Endangered

Santa Cruz tarplant Holocarpha macradenia CA P Threatened
Santa Monica Mountains dudleyea Dudleya cymosa ssp. ovatifolia CA P Threatened

Santa Rosa Island fox Urocyon littoralis santarosae CA V Endangered
Santa Rosa Island manzanita Arctostaphylos confertiflora CA P EndangeredA

- 52 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Scaleshell mussel Leptodea leptodon AR, MO, NE, OK, SD I Endangered

Schaus swallowtail butterfly Heraclides aristodemus

ponceanus FL I Endangered

Schweinitz's sunflower Helianthus schweinitzii NC, SC P Endangered
Scioto madtom Noturus trautmani OH V Endangered Scotts Valley polygonum Polygonum hickmanii CA P Endangered

Scrub blazingstar Liatris ohlingerae FL P Endangered

Scrub buckwheat Eriogonum longifolium var. gnaphalifolium FL P Threatened

Scrub lupine Lupinus aridorum FL P Endangered
Scrub mint Dicerandra frutescens FL P Endangered Scrub plum Prunus geniculata FL P Endangered

Seabeach amaranth Amaranthus pumilus DE, NC, NJ, NY, SC, VA P Threatened

Sebastopol meadowfoam Limnanthes vinculans CA P Endangered

Sei whale Balaenoptera borealis CA, MA V Endangered

Sensitive joint

- vetch Aeschynomene virginica MD, NC, NJ, VA P Threatened

Sentry milk

- vetch Astragalus cremnophylax var. cremnophylax AZ P Endangered

Shale barren rockcress Arabis serotina VA, WV P Endangered Shasta crayfish Pacifastacus fortis CA I Endangered

Sheepnose mussel Plethobasus cyphyus AL, IA, IL, IN, KY, MN, MO, MS, OH, PA, TN, VA, WI,
WV I Endangered

Shenandoah salamander Plethodon shenandoah VA V Endangered Shiny pigtoe Fusconaia cor AL, TN, VA I Endangered Shinyrayed pocketbook Lampsilis subangulata AL, FL, GA I Endangered

Shivwits milk

- vetch Astragalus ampullarioides UT P EndangeredA

- 53 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Short

- leaved rosemary Conradina brevifolia FL P Endangered

Shortnose sturgeon Acipenser brevirostrum CT, DE, FL, GA, MA, MD, ME, NC, NJ, NY, PA, RI, SC, VA V Endangered

Shortnose sucker Chasmistes brevirostris CA, OR V Endangered Short's goldenrod Solidago shortii IN, KY P Endangered

Short

- tailed albatross Phoebastria (=Diomedea) albatrus CA, HI, OR, WA V Endangered

Showy Indian clover Trifolium amoenum CA P Endangered Showy stickseed Hackelia venusta WA P Endangered Shrubby reed

- mustard Schoenocrambe suffrutescens UT P Endangered Sierra Nevada bighorn sheep Ovis canadensis sierrae CA V Endangered

Siler pincushion

cactus Pediocactus (=Echinocactus,=Utahia) sileri AZ, UT P Threatened

Sinaloan jaguarundi Herpailurus (=Felis) yagouaroundi tolteca NA 1 V Endangered

Slackwater darter Etheostoma boschungi AL, TN V Threatened Slender campeloma Campeloma decampi AL I Endangered
Slender chub Erimystax cahni TN, VA V Threatened
Slender

- horned spineflower Dodecahema leptoceras CA P Endangered

Slender Orcutt grass Orcuttia tenuis CA P Threatened
Slender

- petaled mustard Thelypodium stenopetalum CA P Endangered

Slender rush

- pea Hoffmannseggia tenella TX P Endangered Slickspot peppergrass Lepidium papilliferum ID P Threatened
Small

- anthered bittercress Cardamine micranthera NC, VA P Endangered

Small Kauai (=puaiohi) thrush Myadestes palmeri HI V Endangered

Small's milkpea Galactia smallii FL P EndangeredA

- 54 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Smalltooth sawfish Pristis pectinata AL, FL, GA, LA, MS, NC, SC, TX V Endangered

Small whorled pogonia Isotria medeoloides CT, DE, GA, IL, MA, ME, MI, MO, NC, NH, NJ, NY, OH, PA, RI, SC, TN, VA, WV P Threatened

Smith's blue butterfly Euphilotes enoptes smithi CA I Endangered Smoky madtom Noturus baileyi TN V Endangered

Smooth coneflower Echinacea laevigata GA, NC, SC, VA P Endangered

Snail darter Percina tanasi AL, GA, TN V Threatened Snake River physa snail Physa natricina ID I Endangered

Snakeroot Eryngium cuneifolium FL P Endangered Sneed pincushion

cactus Coryphantha sneedii var. sneedii NM, TX P Endangered

Snuffbox mussel Epioblasma triquetra AL, AR, IL, IN, KY, MI, MN, MO, MS, OH, PA, TN, VA, WI, WV I Endangered

Sockeye salmon Oncorhynchus (=Salmo) nerka OR, WA V Endangered

Sockeye salmon Oncorhynchus (=Salmo) nerka WA V Threatened

Socorro isopod Thermosphaeroma thermophilus NM I Endangered

Socorro springsnail Pyrgulopsis neomexicana NM I Endangered

Soft bird's

- beak Cordylanthus mollis ssp. mollis CA P Endangered

Soft

- leaved paintbrush Castilleja mollis CA P Endangered Solano grass Tuctoria mucronata CA P EndangeredA

- 55 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Sonoma alopecurus Alopecurus aequalis var.
sonomensis CA P Endangered

Sonoma spineflower Chorizanthe valida CA P Endangered
Sonoma sunshine Blennosperma bakeri CA P Endangered
Sonora chub Gila ditaenia AZ V Threatened

Sonoran pronghorn Antilocapra americana
sonoriensis AZ V Endangered

Sonora tiger Salamander Ambystoma tigrinum stebbinsi AZ V Endangered

Southeastern beach

mouse Peromyscus polionotus
niveiventris FL V Threatened

Southern acornshell Epioblasma othcaloogensis AL, TN I Endangered
Southern clubshell Pleurobema decisum AL, GA, MS I Endangered
Southern combshell Epioblasma penita AL, MS I Endangered

Southern kidneyshell Ptychobranchus jonesi AL, FL I Proposed Endangered
Southern mountain wild

- buckwheat Eriogonum kennedyi var.

austromontanum CA P Threatened

Southern pigtoe Pleurobema georgianum AL, GA, TN I Endangered

Southern sandshell Hamiota (=Lampsilis) australis AL, FL I Proposed Endangered
Southern sea otter Enhydra lutris nereis CA V Threatened
South Texas ambrosia Ambrosia cheiranthifolia TX P Endangered

Southwestern willow flycatcher Empidonax traillii extimus AZ, CA, CO, NM, NV, TX,
UT V Endangered

Spalding's catchfly Silene spaldingii ID, MT, OR, WA P Threatened

Speckled pocketbook Lampsilis streckeri AR I Endangered

Spectaclecase (mussel) Cumberlandia monodonta AL, AR, IA, IL, KS, KY, MN, MO, TN, VA, WI, WV I Endangered

Sperm whale Physeter catodon (=macrocephalus) CA, NC, PR V EndangeredA

- 56 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Spikedace Med a fulgida AZ, NM V Threatened

Spotfin Chub Erimonax monachus AL, NC, TN, VA V Threatened

Spotted Seal Phoca largha NA 1 V Threatened Spreading avens Geum radiatum NC, TN P Endangered Spreading navarretia Navarretia fossalis CA P Threatened Spring Creek bladderpod Lesquerella perforata TN P Endangered

Spring

- loving centaury Centaurium namophilum CA, NV P Threatened Springville clarkia Clarkia springvillensis CA P Threatened Spruce

- fir moss spider Microhexura montivaga NC, TN, VA I Endangered Squirrel Chimney cave shrimp Palaemonetes cummingi FL I Threatened

Staghorn coral Acropora cervicornis FL, PR I Threatened
St. Andrew beach

mouse Peromyscus polionotus peninsularis FL V Endangered

Star cactus Astrophytum asterias TX P Endangered

Steamboat buckwheat Eriogonum ovalifolium var. williamsiae NV P Endangered

Stebbins' morning

glory Calystegia stebbinsii CA P Endangered

Steelhead Oncorhynchus (=Salmo) mykiss CA V Endangered

Steelhead Oncorhynchus (=Salmo) mykiss CA V Threatened

Steelhead Oncorhynchus (=Salmo) mykiss OR V Threatened

Steelhead Oncorhynchus (=Salmo) mykiss OR, WA V Threatened

Steelhead Oncorhynchus (=Salmo) mykiss WA V Threatened

Steller sea

- lion Eumetopias jubatus CA, OR, WA V Threatened

Stephens' kangaroo rat Dipodomys stephensi (incl. D. cascus) CA V Endangered

Stirrupshell Quadrula stapes AL, MS I EndangeredA

- 57 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Stock Island tree snail Orthalicus reses (not incl. nesodryas) FL I Threatened

St. Thomas prickly

- ash Zanthoxylum thomasianum PR P Endangered

Suisun thistle Cirsium hydrophilum var. hydrophilum CA P Endangered

Swamp pink Helonias bullata DE, GA, MD, NC, NJ, SC, VA P Threatened

Tan riffleshell Epioblasma florentina walkeri (=E. walkeri) KY, TN, VA I Endangered

Tapered pigtoe Fusconaia burkei AL, FL I Proposed reatened Tar River spinymussel Elliptio steinstansana NC I Endangered Telephus spurge Euphorbia telephioides FL P Threatened Tennessee yellow

eyed grass Xyris tennesseensis AL, GA, TN P Endangered

Terlingua Creek cat's

eye Cryptantha crassipes TX P Endangered

Texas ayenia Ayenia limitaris TX P Endangered
Texas blind salamander Typhlomolge rathbuni TX V Endangered

Texas poppy

- mallow Callirhoe scabriuscula TX P Endangered Texas prairie dawn

flower Hymenoxys texana TX P Endangered

Texas snowbells Styrax texanus TX P Endangered Texas trailing phlox Phlox nivalis ssp. texensis TX P Endangered
Texas wild

- rice Zizania texana TX P Endangered
Thread

- leaved brodiaea Brodiaea filifolia CA P Threatened

Three Forks springsnail Pyrgulopsis trivialis AZ I Proposed Endangered Tiburon jewelflower Streptanthus niger CA P Endangered Tiburon mariposa lily Calochortus tiburonensis CA P Threatened Tiburon paintbrush Castilleja affinis ssp. neglecta CA P Endangered Tidewater goby Eucyclogobius newberryi CA V Endangered Tiny polygala Polygala smallii FL P EndangeredA

- 58 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Tipton kangaroo rat Dipodomys nitratoides nitratoides CA V Endangered

Tobusch fishhook

cactus Ancistrocactus tobuschii TX P Endangered

Todsen's pennyroyal Hedeoma todsenii NM P Endangered Tooth Cave ground beetle Rhadine persephone TX I Endangered

Tooth Cave pseudoscorpion Tartarocreagris texana TX I Endangered

Tooth Cave Spider Leptoneta myopica TX I Endangered

Topeka shiner Notropis topeka (=tristis) IA, KS, MN, MO, NE, SD V Endangered

Triangular kidneyshell Ptychobranchus greenii AL, GA, TN I Endangered Triple

- ribbed milk

vetch Astragalus tricarinatus CA P Endangered

Tubercled blossom (pearlymussel) Epioblasma torulosa torulosa KY, TN, WV I Endangered

Tulotoma snail Tulotoma magnifica AL I Threatened Tumbling Creek cavesnail Antrobia culveri MO I Endangered

Turgid blossom (pearlymussel) Epioblasma turgidula AL, AR, TN I Endangered

Uhiuhi Caesalpinia kavaiense HI P Endangered
Uinta Basin hookless

cactus Sclerocactus wetlandicus UT P Threatened

Umtanum Desert buckwheat Eriogonum codium WA P Proposed Threatened Unarmored threespine stickleback Gasterosteus aculeatus williamsoni CA V Endangered

Uncompahgre fritillary butterfly Boloria acrocnema CO I Endangered

[Unnamed] ground beetle Rhadine exilis TX I Endangered

[Unnamed] ground beetle Rhadine infernalis TX I EndangeredA

- 59 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

[Unnamed] pomace fly Drosophila aglaia HI I Endangered [Unnamed] pomace fly Drosophila differens HI I Endangered [Unnamed] pomace fly Drosophila hemipeza HI I Endangered [Unnamed] pomace fly Drosophila heteroneura HI I Endangered [Unnamed] pomace fly Drosophila montgomeryi HI I Endangered [Unnamed] pomace fly Drosophila mulli HI I Threatened [Unnamed] pomace fly Drosophila musaphila HI I Endangered [Unnamed] pomace fly Drosophila neoclavisetae HI I Endangered [Unnamed] pomace fly Drosophila obatai HI I Endangered [Unnamed] pomace fly Drosophila ochrobasis HI I Endangered [Unnamed] pomace fly Drosophila substenoptera HI I Endangered [Unnamed] pomace fly Drosophila tarphytrichia HI I Endangered Upland combshell Epioblasma metastriata AL, TN I Endangered Utah prairie dog Cynomys parvidens UT V Threatened

Ute ladies'

- tresses Spiranthes diluvialis CO, ID, MT, NE, NV, UT, WA, WY P Threatened

Uvillo Eugenia haematocarpa PR P Endangered
Vahl's boxwood Buxus vahlii PR P Endangered
Vail Lake ceanothus Ceanothus ophiochilus CA P Threatened Valley elderberry longhorn beetle Desmocerus californicus dimorphus CA I Threatened

Ventura marsh milk

vetch Astragalus pycnostachyus var. lanosissimus CA P Endangered

Verity's dudleya Dudleya verityi CA P Threatened
Vermilion darter Etheostoma chermocki AL V Endangered Vernal pool fairy shrimp Branchinecta lynchi CA, OR I Threatened

Vernal pool tadpole shrimp Lepidurus packardi CA I Endangered

Vine Hill clarkia Clarkia imbricata CA P Endangered

Virginia big

- eared bat Corynorhinus (=Plecotus) townsendii virginianus KY, NC, VA,
WV V EndangeredA

- 60 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Virginia fringed mountain snail Polygyriscus virginianus VA I Endangered

Virginia northern flying squirrel Glaucomys sabrinus fuscus VA, WV V Endangered

Virginia round

- leaf birch Betula uber VA P Threatened

Virginia sneezeweed Helenium virginicum MO, VA P Threatened

Virginia spiraea Spiraea virginiana GA, KY, NC, OH, PA, TN, VA, WV P Threatened

Virgin Islands tree boa Epicrates monensis granti PR V Endangered Virgin River Chub Gila seminuda (=robusta) AZ, NV, UT V Endangered
Waccamaw silverside Menidia extensa NC V Threatened
Wahane Pritchardia aylmer

- robinsonii HI P Endangered
Walker's manioc Manihot walkerae TX P Endangered

Warm Springs pupfish Cyprinodon nevadensis pectoralis NV V Endangered

Warner sucker Catostomus warnerensis NV, OR V Threatened
Watercress darter Etheostoma nuchale AL V Endangered

Water howellia Howellia aquatilis CA, ID, MT, OR, WA P Threatened

Wawae`iole Huperzia mannii HI P Endangered

Wawae`iole Lycopodium (=Phlegmariurus)

nutans HI P Endangered

Welsh's milkweed Asclepias welshii AZ, UT P Threatened
Wenatchee Mountains checkermallow Sidalcea oregana var. calva WA P Endangered

Western lily Lilium occidentale CA, OR P Endangered

Western prairie fringed orchid Platanthera praeclara IA, KS, MN, MO, ND, NE, OK, SD P Threatened

Western snowy plover Charadrius alexandrinus
nivosus CA, OR, WA V ThreatenedA

- 61 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

West Indian manatee Trichechus manatus AL, FL, GA, LA, MS, NC, PR, SC, TX V Endangered

West Indian walnut (=Nogal) Juglans jamaicensis PR P Endangered

Wheeler's peperomia Peperomia wheeleri PR P Endangered
White Abalone Haliotis sorenseni CA I Endangered
White birds

- in

- a

- nest Macbridea alba FL P Threatened White bladderpod Lesquerella pallida TX P Endangered
White Bluffs bladderpod Physaria douglasii tuplashensis WA P Proposed Threatened White catspaw (pearlymussel) Epioblasma obliquata perobliqua IN, OH I Endangered

White

- haired goldenrod Solidago albopilosa KY P Threatened

White irisette Sisyrinchium dichotomum NC, SC P Endangered
White

- necked crow Corvus leucognaphalus NA 1 V Endangered
White

- rayed pentachaeta Pentachaeta bellidiflora CA P Endangered

White River spinedace Lepidomeda albivallis NV V Endangered White River springfish Crenichthys baileyi baileyi NV V Endangered White sedge Carex albida CA P Endangered White sturgeon Acipenser transmontanus ID, MT V Endangered White wartyback (pearlymussel) Plethobasus cicatricosus AL, IN, KY, TN I Endangered

Whooping crane Grus americana CO, KS, MT, ND, NE, OK, SD, TX V Endangered

Wide

- leaf warea Warea amplexifolia FL P Endangered

Willamette daisy Erigeron decumbens var. decumbens OR P Endangered

Willowy monardella Monardella viminea CA P Endangered

Winged mapleleaf Quadrula fragosa AR, MN, MO, OK, WI I Endangered

Winkler cactus Pediocactus winkleri UT P ThreatenedA

- 62 Federally Threatened, Endangered, and Proposed Species in Corn Production U.S. States and Puerto Rico (continued)

Common Name Scientific Name Current Distribution Vertebrate (V) Invertebrate (I) Plant (P) Listing Status

Wireweed Polygonella basiramia FL P Endangered
Woodland caribou Rangifer tarandus caribou ID, WA V Endangered

Wood stork Mycteria ameri cana AL, FL, GA, MS, NC, SC V Endangered

Woundfin Plagopterus argentissimus AZ, NM, NV,
UT V Endangered

Wright fishhook cactus Sclerocactus wrightiae UT P Endangered Wyoming toad Bufo baxteri (=hemiophrys) WY V Endangered Yadon's piperia Piperia yadonii CA P Endangered Yaqui catfish Ictalurus pricei AZ V Threatened Yaqui chub Gila purpurea AZ V Endangered
Yellow blossom (pearlymussel) Epioblasma florentina florentina AL, TN I Endangered

Yellow

- blotched map turtle Graptemys flavimaculata MS V Threatened

Yellowcheek darter Etheostoma moorei AR V Endangered Yelloweye rockfish Sebastes ruberrimus NA 1 V Threatened
Yellowfin madtom Noturus flavipinnis TN, VA V Threatened Yellow larkspur Delphinium luteum CA P Endangered
Yellow

- shouldered blackbird Agelaius xanthomus PR V Endangered

Yreka phlox Phlox hirsuta CA P Endangered Yuma clapper rail Rallus longirostris yumanensis AZ, CA, NV V Endangered Zapata bladderpod Lesquerella thamnophila TX P Endangered Zayante band

- winged grasshopper Trimerotropis infantilis CA I Endangered

Zuni fleabane Erigeron rhizomatus AZ, NM P Threatened
Note 1. Specific current distribution is not available, but these species are listed wherever found.

Reference:

USFWS. (2012). Species Reports, Environmental Conservation Online System. Retrieved May 17, 2012, from U.S. Fish and Wildlife Service, http://ecos.fws.gov/tess_public/.