NOAA Technical Memorandum NMFS-NWFSC-5 

Seasonal Changes 

in the Intertidal and Subtidal 

Macrobenthic Invertebrate 

Community Structure 

in Baker Bay, 

Lower Columbia River Estuary 

Toshio Furota 1 and Robert L. Emmett 

National Marine Fisheries Service 

Northwest Fisheries Science Center 

Coastal Zone and Estuarine Studies Division 

2725 Montlake Blvd. E., Seattle, WA 98112 

1 Present address: Toho University 

Faculty of Science 

Mlyania 2-2-1 

Funabashi, Chiba, 274 Japan 

January 1993 

u.s. DEPARTMENT OF COMMERCE 

Barbara Hackman Franklin, Secretary 

National Oceanic and Atmospheric Administration 

John A. Knauss, Administrator 

National Marine Fisheries Service 

WIlliam W. Fox, Jr., Assistant Administrator for Fisheries 
This document is available to the public through: 

National Technical Information Service 

U.S. Department of Commerce 

5285 Port Royal Road 

Springfield, VA 22161 
iii 

ABSTRACT 

Macrobenthic invertebrates and sedLments at 1 subtidal and 10 intertidal 

stations along a transect in Baker Bay of the lower Columbia River estuary 

were sampled monthly from November 1980 to October 1981. Water column 

temperatures and salinities were also recorded at the subtidal station. The 

intertidal community consisted primarily of estuarine species, whereas the 

subtidal community had additional marine species. Marine species declined in 

abundance after the interstitial salinity minimum (June), indicating the 

important role of salinity in determining benthic community structure. 

Filamentous algae, tide pools, and eelgrasses (Zostera spp.) were also 

important factors determining macrobenthic invertebrate community structure. 

By altering sedLment characteristics, Zostera spp. had a positive effect on 

deposit feeders and a negative effect on the sand-dwelling amphipod 

Eohaustorius estuaris. 

v 

CONTENTS 


Page 


INTRODUCTION 1 


METHODS •.• 2 


Study Site 

Sampling Procedure 

2 


2 


RESULTS AND DISCUSSION 6 


Water Temperature and Salinity 

Sediment Characteristics 

6 


6 


Benthic Invertebrates • • • • 10 


Efficiency of Sampling Method 10 


Vertical Distribution Along the Tidal Gradient 

Seasonal Changes 

Intertidal Community 

17 


17 


17 


Subtidal Community 

Effect of Salinity on the Benthic Community • 

Effect of Vegetation on the Benthic Community • 

18 


19 


19 


Filamentous Algae 

Ee1grasses 

CONCLUSIONS 

19 


22 


26 


ACKNOWLEDGMENTS • 27 


CITATIONS • • • • 29 


APPENDIX TABLE 33 


INTRODUCTION 

Changes in the faunal communities of estuaries are caused by physical, 

chemical, and biological processes. One of the most important physical 

factors determining the benthic fauna is salinity (Boesh 1977). In intertidal 

areas where physical conditions are extreme, distinct vertical distributions 

of benthic fauna have been observed (Brady 1943; Wells and Roberts 1980). 

Furthermore, benthic infauna diversity and density are affected by vegetative 

growth, particularly of eelgrass (Zostera spp.), which increases sediment 

stability and interrupts the movement of burrowing animals (Orth 1977; Ringold 

1979) • 

For much of the year, the Columbia River estuary is characterized by low 

salinity due to large inputs of fresh water. Salinity is highest during late 

summer-early fall at the river mouth where surface salinity ranges from 5.8 to 

30.5~. Lowest salinity occurs in early summer as a result of snowmelt from 

the headwaters (Neal 1972). Large tidal fluctuations (>3.0 m) result in 

extensive tidal flats in the estuary. 

The benthic macrofauna in the Columbia River estuary has been well 

studied (Haertel and Osterberg 1967: Higley and Holton 1975: Sanborn 1975: 

Higley et ale 1976: Higley and Holton 1978: Higley et ale 1979: Durkin and 

Emmett 1980: Durkin et ale 1981: Jones 1984). Major components of the benthic 

macrofauna include: the amphipods Corophiumsa~onis,£. spinicorne, and 

Eohaustorius estuaris: the polychaetes Neanthes limnicola and Hobsonia 

florida; and the bivalve Macoma balthica. 

The objectives of this study were to determine the influences of 

seasonal changes in salinity and the presence of intertidal vegetation on the 

macrobenthic community and to describe the vertical changes in the benthic 

fauna along a tidal gradient on an intertidal-subtidal flat in Baker Bay, 

Columbia River estuary. 
2 

METHODS 

Study Site 

Baker Bay is located on the north side of the lower Columbia River 

estuary and has broad tidal flats consisting mainly of fine sand (Durkin and 

Emmett 1980). Eleven stations were sampled along a transect that extended 

from the mean high water level to the bottom of the adjacent boat channel at 

the northwest corner of Baker Bay (Fig. 1). Figure 2 depicts a cross section 

of the study site and shows station locations and the sediment characteristics 

of each station as observed in February 1981. 

At Stations 1 and 2, three-square bullrush (Scirpus americanus) 

surrounded the sandy flats that were sampled. During late summer to early 

fall, filamentous algal mats, consisting of blue green algae (Lyngbya spp.) 

and a chrysophyte of the genus Vaucheria, densely covered the sediment 

surfaces of some areas at these stations. 

Stations 1 through 10 were exposed during extremely low water. Patches 

of the eelgrasses Zostera japonica (on the upper intertidal area, Stations 3­

7) and~. marina (on the lower intertidal area, Stations 7-10) grew from July 

through October. Stations 4 through 7 had ripple marks on the sediment surface 

indicating relatively frequent wave disturbances. 

Station 11, which was located at the bottom of the adjacent boat channel 

(subtidal), was about 4 m deep at mean low water. 

Sampling Procedure 

At each station, three benthic invertebrate samples and one sediment 

core (10 em deep by 5 em in diameter) were taken monthly from November 1980 to 

October 1981 (see Appendix), usually during the second negative tide series. 

Intertidal stations were sampled for invertebrates using a 506 em2 (10 em 

deep) metal frame. At the subtidal site (and lower intertidal sites) a 

506-em2 Ekman-Birge sediment sampler was used. The Ekman-Birge sampler was 

handled directly by scuba divers, except at Station 11 where it was operated 

from a research boat using a messenger weight. During the last 2 months, 

however, this sampler was operated directly by divers at Station 11 (less ship 
3 


Oregon 

Figure 1.--Benthic invertebrate and sediment sampling sites in 

Baker Bay, Columbia River estuary, November 1980 to 

October 1981. 
Particle 


size (mm) 


2.0°, St. 6 St.7 st. 8 st.g St.l0 St.l1 


1.0 

0.5~ 0.25)===r­ 0.125 ) 

0.063 

<0.063 

EHW 3 

- MHW 

2 - MTL 

1 

- MLW -1- MLLW 0 Particle 

size (mm) "!o..:-- - ELW c

2.0 I St. 1 t·,.,

1.0 ... 0.5 1 ; 2:7 

0.063 o~'~:Jf===~- It==•. 3

<0.063 


I ---.- ---- I It 


o 50 100% (m) . ------. o 100m 

~ 

Figure 2.--A cross section of the study site in Baker Bay, Columbia River estuary, showing 

station locations and sediment characteristics observed in February 1981. Tidal 

levels are EHW - Extre~e High Water, MHW = Mean High Water, MTL - Mean Tidal 

Level, MLW - Mean Low Water, MLLW - Mean Lower Low Water, and ELW - Extreme Low 

Water. 

-;) ;,I ~ a ~ ~ ~ ~ ~ ~ 
5 


traffic reduced the hazards for divers). Invertebrate samples were placed in 

a sieve box and washed through a 0.595 mm (No. 30) screen. Samples were then 

fixed in a 4% formaldehyde solution containing Rose-bengal (a protein stain) . 

During October 1981, two stations (Stations 3 and 7) were sampled to a 

depth of 20 em. These sediments were divided into top (0 to 10 em) and bottom 

(10 to 20 em) portions 'and analyzed separately to identify the efficiency of 

the sampling method. 

Samples for benthic invertebrate analysis were rinsed of formaldehyde, 

and invertebrates were then picked from the sample, separated by species or 

major taxonomic groups, and counted. Wet weights of the invertebrates were 

determined to the nearest O.OOL 9 at Toho University, Chiba, Japan, using a 

Sartorius1 2355 balance. The weights of some invertebrates were not obtained 

because they were damaged during transport from the United States to Japan. 

Sediment composition for the February 1981 samples was determined by 

sieving the sediment through a set of sieves (2.0, 1.0, 0.5, 0.25, 0.125, and 

0.063 mm) and then weighing each pre-weighed seive. Interstitial salinities 

were determined by drawing water from the core sediment using an aspirator 

with a Millipore HA filter; a silver nitrate method was then used to measure 

salinity (Strickland and Parsons 1968). At Station 11 (subtidal boat 

channel), water temperature and salinity were measured monthly at 1-m 

intervals (surface to bottom) using a Beckman Model RS53 salinometer and 

probe. 

Differences between benthic invertebrate densities in samples from 

stations with and without eelgrass, were tested for statistical significance 

using either a Chi-square test (no zeros in the data) or a Mann-Whitney test 

(some zeros in the data). 

YReference to trade names does not imply endorsement by the National Marine 

Fisheries Service, NOAA. 
6 

RESULTS AND DISCUSSION 

Water Temperature and Salinity 

Water column temperatures at Station 11 ranged from 6.0°C in January to 

17.7°C in August (Table 1). Vertical changes in temperatures varied little 

throughout the year. 

Water column salinities tended to be lower during late winter to early 

summer, with the lowest salinity, 3.5~, occurring near the surface in 

February (Table 2). The highest salinity, 22.4~, was recorded at 5 m in 

December. Though salinity tended to increase with water depth, vertical 

differences in salinity were not great, suggesting that water in the study 

area was well mixed. 

Throughout the year, interstitial salinities were lower at the 

intertidal sites than at the subtidal site (Table 3). Intertidal interstitial 

salinities were lowest during the spring and early summer, with the lowest 

levels occurring in late June «2.0~). Sanders et al. (1965) showed that in 

an Atlantic coast estuary, interstitial salinities remained relatively 

constant even though overlying water salinities varied diurnally. In Baker 

Bay, however, low interstitial salinities occurred in June as a result of the 

large input of fresh water from the Columbia River that consistently overlaid. 

the tidal flat during this period. 

Seasonal fluctuations of subtidal interstitial salinities were 

relatively small but followed a pattern similar to that of the intertidal 

stations. 

Sediment Characteristics 

The sediment of the tidal flat (Stations 1 through 9) consisted 

primarily of medium (0.500 rom ~ 0.250 rom in diameter) and fine sand (0.250 rom 

~ 0.125 rom in diameter), (Fig. 2). Subtidal sediment was composed primarily 

of fine sand with some silt and clay « 0.063 rom in diameter) at Station 10 

and very fine sand (0.125 rom ~.063 rom in diameter) and silt-clay at 

Station 11. 
Table 1.--Monthly (1980-81) water column temperatures (OC) at Station 11 (subtidal channel 

site) in Baker Bay, Columbia River estuary. 

1980 1981 

(m) 

Depth Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct 

0 8.9 8.5 6.1 7.3 8.9 11.0 12.8 16.2 17.2 17.7 15.2 12.3 

1 8.9 8.5 6.1 7.1 8.9 ·11.0 12.5 16.2 17.2 17.7 15.3 12.3 

2 9.0 8.5 6.1 6.9 9.0 11.0 12.6 16.1 17.2 17.7 15.4 12.2 

3 8.9 8.8 6.0 6.8 9.0 11.0 12.5 16.1 17.0 17.7 15.4 12.2 

4 .

- 8.8 6.0 6.9 8.9 11.0 12.6 16.1 16.8 17.6 15.3 12.2 

5 9.1 6.1 9.1 12.6 16.1 16.8 17.6 15.5 12.1 ...:J

• Temperatures not taken because of reduced water depth. 
Table 2.--Monthly (1980-1981) water column salinities (ppt) at Station 11 (subtidal channel 

site) in Baker Bay, Columbia River estuary 

1980 1981 

(m) 

Depth Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct 

0 7.2 12.0 7.0 3.5 7.9 7.7 5.9 6.0 7.8 10.7 12.0 9.9 

1 7.3 12.1 7.0 3.5 7.9 7.8 5.9 6.0 7.7 10.7 12.1 10.0 

2 7.3 13.1 7.1 3.8 8.0 7.9 6.3 6.0 7.7 10.7 12.3 10.4 

3 7.9 17.8 7.1 4.2 8.4 8.0 6.6 6.0 9.4 10.9 12.4 10.7 


4 -* 21.1 7.1 5.9 8.6 8.3 7.0 6.2 11.0 10.9 12.4 11.3 


5 22.4 7.7 10.3 8.2 6.8 11.9 11.2 12.4 11. 9 

co 

* Salinities not taken because of reduced water depth. 

~ a ~ ~ ~ ~ ~ ~ ~ ~ ~ 
Table 3.--Monthly (1980-81) salinities (ppt) of interstitial waters in intertidal 

(stations 1-10) and subtidal (Station 11) sediments collected in Baker Bay, 

Columbia River estuary. 

1980 1981 

Station Nov Dec Jan reb Mar Apr Hay Jun Jul Aug Sep Oct 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

11 

-• 

9.0 

9.0 

13.8 

8.8 

8.8 

8.2 

15.5 

6.5 

6.2 

9.0 

6.5 

9.9 

7.3 

6.2 

6.2 

6.2 

7.8 

6.5 

8.1 

7.4 

9.0 

3.7 

3.7 

4.2 

6.0 

9.8 

7.0 

6.5 

6.5 

7.7 

7.6 

6.0 

6.2 

7.0 

6.7 

9.6 

2.0 

1.9 

1.7 

1.5 

1.7 

1.5 

4.1 

4.4 

3.7 

7.2 

7.2 

7.6 

7.0 

7.2 

7.2 

7.4 

8.2 

7.8 

7.4 

10.9 

15.5 

10.8 

11.1 

10.8 

10.3 

10.6 

9.1 

9.5 

9.5 

11.1 

15.4 

16.7 

13.9 

12.3 

15.3 

17.0 

15.8 

10.9 

11.0 

10.9 

15.5 

11.2 

11.4 

10.2 

10.3 

10.4 

11.3 

10.2 

10.0 

10.4 

16.2 

\D 

• Salinity not determined. 
10 

Benthic Invertebrates 

Thirty-seven different benthic invertebrates were identified (Table 4). 

The polychaetes Neanthes limnicola and Hobsonia florida, the bivalve Macgma 

balthica, and the amphipods Corophium salmonis and Eohaustorius estuaris were 

abundant in the study area throughout the year (Figs. 3, 4). Gravimetrically, 

H. balthica was the dominant species in the intertidal community followed by 

H. limnicola. These two species comprised more than 90% of the total weight 

of the middle-low intertidal community (Fig. 4). At the subtidal site, 

H. balthica was the most important species numerically and gravimetrically, 

followed by the spionid polychaete Pseudgpolydra kempi (Fig. 5). 

In a previous Baker Bay study, Higley and Holton (1978) found 

oligochaetes and H. balthica abundant in the bay as a whole, with the 

haustorid amphipod E. estuaris and the capitellid polychaete Medigmastus 

califgrniensis abundant only in shallow and deep habitats, respectively. In a 

nearby intertidal mudflat in Baker Bay, Jones (1984) observed that Macgma 

balthica and the polychaetes a. flgrida and ~. were the dominant members 

of the benthic community, followed by oligochaetes and the polychaete H. 

Itmnicgla. Oligochaetes were not abundant in our study. This may be related 

to sieve sizes: Higley and Holton (1978) used 0.425 mm screens, Jones (1984) 

used 0.125 mm screens, and we used 0.595 mm screens. 

Efficiency gf Sampling Hethgd 

Holton et ale (1984) reported that benthic invertebrates in Baker Bay 

were most abundant in the top 10 em of the sediment. Similarly, our analysis 

showed that a 10-em depth sample was sufficient to describe the macrobenthic 

community at our stUdy site, although several species would be slightly 

underestimated (Table 5). For example, while sampling, we observed many adult 

soft-shell clams, Hya arenaria, in the lower intertidal areas. However, 

because they lived more that 20 em below the sediment surface, we did not 

sample this species quantitatively. Thus, estimations of these undersampled 

species were excluded from our analysis. 
11 


Table 4.--Invertebrate taxa found in an intertidal-subtidal area in Baker Bay, 

Columbia River estuary, November 1980 through October 1981. 

Phylum Platyhelminthes 

Class Turbellaria 

Phylum Nemertea 

Phylum Aschelminthes 

Class Nematoda 

Phylum Annelida 

Class Polychaeta 

Subclass Errantia 

Family Phyllodocidae 

Eteone dBatae 

Eteone light! 

Family Nereidae 

Neanthes IimnicQla 

Family Goniadidae 

Glycinde polygnatha 

Family Glyceridae 

Hem1podus bopealis 

Subclass Sedentaria 

Family Ampharetidae 

Hobson!a flgrida 

Family Spionidae 

Pseudgpglydgra kempi 

Pglydgn Hgni 

Pyggspig elegans 

Family Capitellidae 

HetergmAstus filifgrmis 

Family Sabellidae 

Hanayunkia aestuarina 

Phylum Arthropoda 

Class Crustacea 

Subclass Cirripedia 

Order Thoracica 

Family Balanidae 

Balanus sp. 

Subclass Malacostraca 

Superorder Peracaridae 

Order Mysidacea 

Family Mysidae 

Ne~sis mergedi. 

Order Cumacea 

Family Leuconidae 

HemHeuggn sp. 

Order Tanaidacea 
12 


Table 4.--(Continued). 

Family Tanaidae 

Pancolus californiensis 

Order Isopoda 

Suborder Flabellifera 

Family Sphaeromatidae 

Gnor~osphaeroma lutea 

Suborder Valvifera 

Family Idoteidae 

Saduria entomon 

Order Amphipoda 

Suborder Gammaridea 

Family Eohaustoriidae 

Eohaustorius estuaris 

Family Gammaridae 

Eogammarus oclairi 

Eogammarus confervicolus 

Family Corophiidae 

Corophium salmonis 

Corophium spinicorne 

Superorder Eucarida 

Order Decapoda 

Suborder Natantia 

Family Crangonidae 

Crangon franciscorum 

Suborder Reptantia 

Family Cancridae 

Cancer magister 

Class Insecta 

Order Diptera 

Family Chironomidae 

Family Dolichopodidae 

Family Ephydridae 

Phylum Mollusca 

Class Gastropoda 

Order Sacoglossa 

Class Bivalvia 

Order Mytiloida 

Family Mytilidae 

Mytilus edulis 

Order Veneroida 

Family Cardiidae 

Clinocardium nuttallii 

Family Tellinidae 

Macoma balthica 

Order Myoida 

Family Myidae 

Mya arenaria 
13 


10 

ElW 

11 

A. 

Number/m2 

10 500 February &1 1Ao 1 3 EHW 

-E

:;'2 

I 0 <> c: Mlt 'a .2 

11 1i 

8 ;; •

1

I 

0 

~ II ULLW 

ELW 

Ji! .I .£I I I 

E ! 

.a 

.!! 

« I I 1... 

I 

1.I( I c CD .!! I ~ e co s co ;; 

0 

i i i i I 8 6 ~ UJ t j ·if ~ II 

CD ~ ~ 

B. Number/m2 August 10 IlOO 


3 EHW 1
 &1 1110 

:;'2 2 -E ::;: 1 

1- U1t 'a •

3 

5 c: 

'a 1 

•

c: " • .2 

~ I 10 MLLW • 

I. ElW 0 
 10

ELW 

I 

I I 

~ 

c i 

j II i 

t 

0 

1 

I I 

JQ 

t 

.£I t 

11 

Ji! ... ... .I( 

:ti 

0 

J i 

8 is I I I J I 

I i I I ~ 

~ cf 

Figure 3.--Tidal elevation distributions (in number/~) of macrobenthic 


invertebrates alonq a transect in Baker Bay, Columbia River 


estuary: A) February 1981 and B) August 1981. 

14 

J J A s o 

B.200 

150 

.. 

E 

.... 

CJI 

100 

lX 

Cl 

w 

~ .; 


I&i 


50 

o 

N o J F M A M 

MONTH 

M.b.: Macoma balthica 

N. I. Nean' hes limni cola 

E••• : Eohauslorius esluaris 

H.I. : Hobsonia florida 

Oth.: Others 

J J A s o 

A. 7 

6 

5 

..

E 

... 4 .. 


0 

> 

I­ 3 

(I) 

z 

w 

c 

2 

1 

o 

N.I.: 

M.b.: 

H. f.: 

E.e. 

C.s. 

P.e. 

E.d. 

P.k. 

Oth.: 

N o J 

Neanlhes Iimnicola 

Macoma belillica 

Hobsonia florida 

Eohauslorius esluaris 

Corophium salmonis 

Pygospio e/egans 

Eleone dilalae 

Pseudopolydora kempi 

Others 

F M A M 

­

Figure 4.--Monthly changes (1980-81) in the densities (A) and weights (B) of 

macrobenthic invertebrates on middle-low sites (Stations 3-10) in 

Baker Bay, Columbia River estuary. 
M.b.: Macoma ballhiclI 

P.k. : Pse.udopolYdOra Icemp; A. 5 

H. I.: Hob·sonia florida 

H.s. : 

Oth. : 4 

-N 

E 

...... 3 0

... 

>

... 2 U) 

z 

III 

Q 

1 

o 

N D J F M A M J J 5 o 

B. 200 

M.b. : Macoma ballhica 

Oth. : Other. 

150 

...­

E

... 

lit 

100 ... 

% 

" 0 

~ 

III 

~ 

50 

.. ~ 

0 -

.. 0 ~ 

MONTH 


15 


Figure 5.--Monthly chanqes (1980-81) in the densities (A) and weiqhts (B) of 

macrobenthic invertebrates at a subtidal site (Station 11) in 

Baker Bay, Columbia River estuary. 
16 

Table 5.--Vertical distributions of benthic animals on a tidal flat in Baker 

Bay, Columbia River estuary, in October 1981. 

Upper intertidal Middle intertidal 

(Station 3) (Station 7) 

Depth (em) below 

sediment surface 0-10 10-20 0-10 10-20 

Turbellaria 968.4- (0.079)b 448.6 (0.099) 59.3 (0.040) 0.0 (0.000) 

Nemertea 0.0 (0.000) 0.0 (0.000) 39.5 (0.791) 0.0 (0.000) 

Eteone dilatae 652.1 (2.352) 79.1 (0.059) 0.0 (0.000) 

Neanthes limnicola 4,762.8 (62.925) 59.3 (0.099) 2,351.8 (40.988) 59.3 (1. 304) 

Hobsonia florida 5,671.9 (1.312) 118.6 (0.356) 3,359.7 (5.277) 39.5 (0.138) 

Pseudopolvdora kempi 19.7 (0.059) 0.0 (0.000) 39.5 (0.138) 0.0 (0.000) 

Polydora ligni 0.0 (0.000) 0.0 (0.000) 19.8 (+) 0.0 (0.000) 

Pygospio elegans 118.6 (0.020) 0.0 (0.000) 19.8 (0.079) 0.0 (0.000) 

Heteromastus filiformis 0.0 (0.000) 0.0 (0.000) 19.8 (0.079) 0.0 (0.000) 

Bnorimosphaeroma lutea 19.8 (0.020) 0.0 (0.000) 0.0 (0.000) 0.0 (0.000) 

Eohaustorius estuaris 59.3 (0.277) 0.0 (0.000) 691. 7 (2.51) 59.3 (0.138) 

Eogammarus oclairi 59.3 (0.059) 19.7 (+) 0.0 (0.000) 59.3 (+) 

Eoqammarus confervicolus59.33 (0.099) 98.8 (+) 375.5 (1.008) 19.8 (+) 

Eogammarus spp. 

(juveniles) 138.4 (0.020) 0.0 (0.000) 0.0 (0.000) 0.0 (0.000) 

Corophium salmonis 7,885.4 (8.834) 889.3 (0.119) 513.8 (0.573) 19.8 (+) 

£.. spinicorne 513.8 (1.047) 118.6 (0.020) 138.3 (0.040) 0.0 (0.000) 

Chironomidae 237.2 (0.099) 19.7(+) 0.0 (0.000) 0.0 (0.000) 

Macoma balthica 1,067.1 (521.818) 19.8(12.964) 988.1(203.656) 39.5 (26.028) 

TOTAL 22,233.1 (599.020)1,812.2(13.657) 8,695.~255.179) 296.5 (27.608)

• number/m2 

b weight (g) 1m2 

c + _ weight less than 0.020 9 
17 


Vertical Distribution Along the Tidal Gradient 

The vertical distributions of abundant benthic invertebrates along the 

tidal gradient in winter (February 1981) and summer (August 1981) were similar 

(Fig. 3), suggesting that the distribution patterns did not change throughout 

the year. In the upper two stations (Stations 1 and 2) insect larvae 

(Dolichopodida and Chironomidae) were dominant; their distributions were 

restricted to this area. Most other invertebrates were distributed below this 

zone showing a clear zonal separation from the insect larvae, especially in 

summer. Neanthes limnicola and~. florida were also abundant in the upper 

tidal zone if tide pools existed. This agrees with Lewis (1961) who showed 

that physical conditions, such as desiccation, are important factors 

determining the upper limit of intertidal animals on rocky shores. 

The densities of Pygospio elegans, ~. florida, and £. sa1monis were low 

in the middle tidal zone (Stations 5 through 8) where ripple marks on the 

sediment surface indicated that the substrate was relatively unstable. In 

contrast to polychaetes, the amphipod Zohaustorius estuaris was relatively 

abundant on this unstable sediment. Pseudopolydora kempi was one of the most 

important members of the intertidal flat community in Baker Bay (Jones 1984) 

and was often abundant from the low tidal zone to the subtidal bottom where 

the sediment had a high silt-clay content. This suggests that the stability 

of the sediment surface plays an important role in determining the species 

composition and abundance of intertidal invertebrates. 

Seasonal Changes 

Intertidal Community--Numerically dominant species throughout the year 

in the intertidal community were~. limnicola, ~. florida, ~. estuaris, 

Macoma balthica, and £. salmonis (Fig. 4). Peak densities were related to 

recruitment and were observed in May for ~. balthica, June for~. estuaris, 

June and August through October for £. sa1monis, July for ~. limnicola, and 

July and October for~. florida. These population peaks coincided closely 

with peaks found in another Baker Bay intertidal flat, with the exception of 

M. balthica and~. estuaris (Jones 1984). Zohaustorius estuaris was not 

present in the other flat where ~. balthica spat settled in late summer or 
18 


early fall (Jones 1984). The reason for the different seasons of spat 

settlement on the two flats is unknown. Also of note, the decreases in 

densities of two spionid polychaetes, Pygospio elegans and Pseudopolydora 

kempi, coincided with the decline of interstitial salinities (Fig. 4). 

More than 90% of the weight of the intertidal benthic community through 

the year consisted of ~. balthica and~. limnicola. The community weight of 

~. balthica increased during wa~er seasons (spring to fall), even after its 

population numbers had decreased in summer. This suggests the increase was 

related to individual growth. 

The intertidal community biomass increased gradually during this study 

with a max~urn in the final month, October 1981. Because observations were 

not made during the following winter, it is not known whether the community 

weight declined to the level observed in the previous winter. 

Subtidal Community--Macoma balthica was the most numerous species for 8 

months from May to October and accounted for the largest portion of the 

community biomass throughout the year at the subtidal site (Fig. 5). Total 

biomass of M. balthica increased in late summer and early fall. Because there 

were increases in both number and individual weights of M. balthica at the 

subtidal site, it is unclear whether the increases in total weight resulted 

more from growth or recruitment. 

At the subtidal station, Pseudopolydora kempi was abundant until the 

interstitial salinity min~um of 7.2~ occurred in June. The ~. kempi 

population recovered in September but dropped again in numbers in October, 

perhaps due to predation or disturbance of the bottom by crabs and fishes 

(Virnstein 1977). The subtidal station is located in a channel known to have 

high densities of Dungeness crabs, Cancer magister (McCabe et al. 1986). 

Jones (1984) observed a sharp peak in the density of ~. kempi in a mudflat in 

Baker Bay in August 1981. In contrast to ~. kempi, densities of ~. florida 

increased in June (Fig. 5). The cumacean of the genus Hemileucon was 

relatively more abundant in winter through spring. 
19 

Effect of Salinity on the Benthic Community 

By identifying their preferred habitat, invertebrates collected in this 

study can be classified into three categories: 1) species of unknown salinity 

preferences, 2) estuarine species, or 3) marine species (Banse and Hobson 

1974; Sanborn 1975; Smith and Carlton 1975; Higley and Holton 1978: Bousfield 

1979) (Table 6). In the intertidal benthic community, estuarine species were 

dominant throughout the year except for October (Fig. 6). Marine species were 

an important component from November until June, when interstitial salinities 

reached a minimum and apparently reduced their numbers. Recovery of the 

marine species took about 4 months. During the recovery period the intertidal 

community was composed almost entirely of estuarine species and those with 

unknown salinity preferences. In October, high densities of chironomid larvae 

(unknown salinity preferences) at the upper intertidal stations (1 and 2) 

contributed almost half of the total community densities (Fig. 6). 

Marine species were relatively more abundant in the subtidal community, 

especially during winter and spring before the June salinity decline. After 

the salinity minimum occurred, the population density of marine species 

remained low throughout the summer, recovering, at least temporarily, in 

September. The recovery of the marine species in the subtidal area occurred 

earlier than on the intertidal flat. This suggests that salinity (average and 

minimum) was an important factor affecting the population density of the 

marine species at the study area. However, densities of marine species also 

declined in October due primarily to lower densities of ~. kempi. With just 

one year's data, it is not possible to determine unequivocally that the 

seasonal salinity decline regulated marine species abundances. Nevertheless, 

the dramatic decline in marine species densities after the salinity minimum 

strongly suggests a cause-and-effect relationship. 

Effect of Vegetation on the Benthic Community 

Filamentous Algae 

Filamentous algae were first observed covering the sediment at the upper 

intertidal sites in January. They formed dense green mats in May and remained 
20 


Table 6.--List of benthic invertebrates and distributional areas on 

intertidal-subtidal sediments in the Baker Bay, Columbia River 

estuary (1980-81). Dotted lines show distribution of nominally 

freshwater species (commonly found in salinity of 0.0 ppt), 

estuarine species (commonly found in salinity ranging from 0.0 to 

25.0 ppt), and marine species (commonly found at salinities greater 

than 25.0 ppt) • 

Fresh ------------~ ------------- Brackish Marine --------- .---------- ---------~ ---------­

Unknown Sa1inity Estuarine Species Karine Species 

Pre:ferances 

Turbellaria Eteone HIJbt1 Eteone d1latae 

Nemertea Neanthes l1mn1cola Glycinde polygnatba 

Balanus sp. Hobsonh flodda Hemipodus borea11s 

Cumacea Polydora HIJD.1 

Chironomidae HemHeucon sp. PseudQPolydpra kemp1 

Dolichopodidae Neomvs1s mercedis Heteromastus f111fQrm1s 

Ephydridae Eobaustorius estuar1s EOlJammarus ocla1r1 

Sacoqlossa Eogammarus conferyicQlus Cancer malJ1ster 

Corgph1um salmon1s Cl1nocard1um nuttal111 

Corgph1um sp1n 1cQrne HYa arenada 

GnQrimpspbaergma ~ 

CranlJQn franciscorum 

Macgma baltbiga 

MytHus eduHs 
21 


12 

18 

A. 16 :tntertida1 

14 

12 '8 

10 ~ 

~ 

8 10 .~ ~ .5 

E 6 -ca

(I) ..,........ 8 


4 0 

~6 2 

~ 0 

·en 4

c: 

C1) 

o 2 

0 


N 0 J F M A M J J A S 0


B. Subtida1 

7 ~ 

E 6 ..,........ 


o 5 

-4

~ ·en 3 

c 

~ 2 

1 

o 

N o J F M A M J J A s o 

MONTH 

_ Unknown salinity praferance species 

t:::J Estuarine species _ Marine special 

­

Figure 6.-- Seasonal changes (1980-81) of the macrobenthic invertebrate 

communities (defined by salinity preferences) and interstitial 

salinities at intertidal stations (A) and at a subtidal station 

(B) in Baker Bay, Columbia River estuary. Salinity means and 

ranges for intertidal stations represented by points within 

capped vertical lines. 
22 


until at least October. Insect larvae (Chironomidae and Dolichopodidae) and 

the sabellid polychaete, Manayunkia aestuarina, were abundarit with the 

occurrence of the agal mat. However, the agal filaments reduced the effective 

size of the sieving screen, and without the agal mat a considerable number of 

these invertebrates could have passed through the 0.595 mm screen. It is 

unclear whether the presence of the algal mat provided habitat for the insect 

larvae and the sabellid polychaete. 

A sacoglossan gastropod occurred with the filamentous algae starting in 

August and showed a maximum density of 1,680/m2 in October. This gastropod 

feeds on algae and stores their chloroplasts in its cerata. Some Sacoglossa 

feed on the chrysophyte Vaucheria (Smith and Carlton 1975), one of the major 

components of the filamentous algal mat, suggesting that the algal mat 

provides habitat and food for this gastropod. 

Lewis (1961) suggested that the upper distribution limit of intertidal 

animals is determined by their physiological tolerance to desiccation. 

Despite the capillary effect of the algae filaments, which prevents 

desiccation of the sediment surface, the abundance of most benthic animals, 

except insects, was lower in the algal mat zone in late summer (Table 7). The 

filamentous algal mat may, under certain conditions, eliminate some of the 

invertebrates that live below the sediment surface, perhaps by preventing 

feeding activity or reducing dissolved oxygen. The presence of a shallow tide 

pool at Station 2 apparently elevated the upper limits of some intertidal 

animals (Table 8). 

Eelgrasses 

The eelgrasses Zostera japoniga and Z. marina formed patchy beds on the 

tidal flat during the summer. Eelgrass beds increase sediment stability, 

resulting in high infaunal diversity and density (Orth 1977), but the rhizomes 

of Zostera spp. physically hinder the movement of burrowing organisms (Ringold 

1979). The amphipods Eogammarus gonferyigolus and CorQphium spinigorne tended 

to be more abundant at stations with eelgrasses (Table 9), suggesting that 

eelgras~ provides substratum for these epiphytic amphipods. The polychaetes 
23 


Table 7.--The mean number of benthic invertebrates per r at two upper 

intertidal stations (Stations 1 and 2) in Baker Bay, Columbia River 

estuary, during February (no sgal mat) and August (with agal mat) 

1981. 

February August 

(No agal mat) (With agal mat) 

Stations 1 2 1 2 

Species 

Mean 

nuinber/m2 

Mean 

number 1m2 

Mean 

number1m2 

Mean 

number1m2 

Turbellaria 0.0 0.0 0.0 19.8 

Polychaeta 

itllS:2nll d11iltilll 

Hllilnthlla UIIID1cglil 

;eglXd°Z::iI 11gn1 

;exggag1g 1I1DQ:ilna 

Hgbsgn1i1 flgdda 

46.1 

6.6 

0.0 

0.0 

13.2 

230.5 

540.2 

6.6 

955.2 

599.5 

0.0 

0.0 

0.0 

0.0 

0.0 

0.0 

92.2 

0.0 

0.0 

0.0 

Crustacea 

Gngz::1mgaghilllz::oma lutllil 

ighiluats;;az::1ua 118tLlilz::1a 

ijg"AIIImAz::u.a gCbid 

ijgQ:ilrnt'IUl Z::Lla cgnfll:cz:1cglLla 

Cgz::ggh1um ulmgn1s 

Cgz::ggh1um sg1n1cgz::nll 

13.2 

32.9 

0.0 

0.0 

0.0 

0.0 

13.2 

171.3 

65.9 

540.2 

3,313.7 

13.2 

0.0 0.0 

0.0 0.0 

0.0 0.0 

0.0 0.0 

0.0 0.0 

0.0 0.0 

Insecta 

Dolichopodidae 

Chironomidae 

112.0 

92.2 

72.5 

5,118.6 

26.4 797.1 

72.5 15,843.2 

Bivalvia 

Ma.CcmJil billth1ca 0.0 26.4 0.0 0.0 

Gastropoda 

Sacogloaaa 0.0 0.0 0.0 39.5 

Total 316.2 11,667.0 98.9 16,791. 8 
24 


Table 8.--Influence of a tide pool and agal mat on the abundance of intertidal 

invertebrates at a high intertidal flat (Station 2) in Baker Bay, 

Columbia River estuary, september 1981. 

Abundance 

Number/m2 

Inside tide pool OUtside tide pool Inside tide pool 

Taxon covered by agal mat covered by agal mat no agal mat 

Turbellaria 39.5 0.0 118.6 

Neanthes limnicola 479.1 0.0 2,272.7 

Pygospio elegans 0.0 0.0 19.8 

Hobsonia florida 59.3 0.0 2,687.7 

Corophiwn salmonis 39.5 0.0 59.3 

Chironomidae 18,102.8 32,628.5 1,857.7 

Dolichopodidae 1,067.2 197.6 59.3 

Ephydridae 1,442.7 3,359.7 0.0 

Sacoglossa 237.2 19.8 0.0 

MaCQma. baltb1cA 0.0 0.0 98.8 

Total 21,467.3 36,205.6 7,173.9 
25 


Table 9.--The abundance of major macrobenthic invertebrate species on 

a tidal flat with and without eelgrass in Baker Bay, 

Columbia River estuary, August 1981. 

Species 

Eelgrass 3 4 

Sta

5 

tion 

6 7 8 

Neanthes limnicola No 

Yes 

90· 

104b 

45 

94 

44 

101 

31 

95 

61 

86 

41** 

32 

Hobsonia florida No 

Yes 

333 

347 

14 

88 

5 

163 

7 

15 

13 

22 

40** 

61 

Eogammarus confervicolus No 

Yes 

2 

18 

1 

2 

0 

16 

0 

3 

0 

9 

0* 

0 

Coro:ehium salmonis No 

Yes 

123 

115 

7 

4 

6 

43 

3 

2 

6 

8 

12** 

17 

Coro:ehium s:einicorne No 

Yes 

1 

6 

0 

0 

0 

35 

0 

3 

0 

5 

0* 

1 

Eohaustorius estuaris No 

Yes 

6 

0 

110 

62 

63 

30 

136 

17 

15 

18 

11** 

16 

Macoma balthica No 

Yes 

26 

36 

34 

36 

20 

29 

21 

28 

22 

26 

20 

29 

TotalC No 

Yes 

620 

677 

217 

291 

176 

479 

198 

166 

118 

177 

125** 

159 

• Mean number contained in two 506 cm2 samples (Samples A and B, See 

Appendix Table) • b Number contained in one 506 ~ sample (Sample C). 

C Includes all species collected. 

*Significant difference: Mann-Whitney, P < 0.05. 

**Highly significant difference: Chi-square,P < 0.001. 
26 


lie limnicola and~. florida were more abundant in eelgrass beds than outside 

the beds between Stations 4 and 6. The positive effect of Zostera spp. beds 

on these surface-feeding polychaetes is probably related to increased sediment 

stability. However, the gammarid amphipod Eohaustorius estuaris, which 

prefers unstable sediment (Bosworth 1973), was less abundant on the zostera 

spp.beds. 

CONCLUSIONS 

The macrobenthic community structure in a fine-sand tidal flat and 

adjacent muddy subtidal site in Baker Bay showed few seasonal changes in 

species composition. The intertidal community consisted mainly of estuarine 

species, such as ~. balthica, lie limnicola, £. sa~onis, ~. florida, and~. 

estuaris, which were abundant throughout the year. Marine species, such as ~. 

kempi, tended to increase in population densities from the intertidal to 

subtidal sites and declined in abundance after the June salinity minimum. 

This indicates that a seasonal reduction in salinity is probably an important 

factor maintaining the community structure of an estuarine-species dominated 

intertidal-subtidal benthos. This reduction was caused by the large spring 

freshet of the Columbia River. 

Two zones of benthic invertebrate communities were observed in the tidal 

flat. The first was an high upper tidal zone (Stations 1 and 2) dominated by 

insect larvae (Chironomidae and Dolichopodidae). A filamentous algal mat 

covered the sediment surface here during summer. The second zone was the 

middle-lower tidal zone. Here, the surface deposit feeders, such as ~. 

balthica, lie limnicola, and~. florida were abundant on the relatively stable 

sediments of the lower tidal areas and on eelgrass beds in the middle tidal 

level. The sand-dwelling amphipod~. estuaris was abundant in the unstable 

sediments of this middle tidal level. 

At the subtidal site, ~. balthica was the dominant species while 

~. kempi was more abundant here than at the other sites. The reduced 

densities of estuarine species in the subtidal site may be related to 

salinity, sediment texture, and perhaps intense fish or crab predation. 
27 


Our results suggest that one of the most important factors determining 

the macrobenthic animal community structure in the Columbia~River estuary is 

salinity. A1so, increased sediment stability and Zostera spp. have a positive 

effect on densities of deposit feeders and a negative effect on the densities 

of ~. estuaris. 

ACKNOWLEDGMENTS 

We would like to give special thanks to Bill Muir for his help in 

sampling and George McCabe, Jr. for his review of this paper. 

29 

CITATIONS 

Banse, K., and K. D. Hobson. 1974. Benthic errantiate polychaetes of 

British Columbia and Washington. Fish. Res. Board Can., Bull. No. 185, 

111 p. 

Boesh, D. F. 1977. A new look at the distribution of benthos along the 

estuarine gradient. In B. C. Coull (editor), Ecology of marine benthos, 

p. 245-266. Univ. South Carolina Press, Columbia, SC. 

Bosworth, W. S. 1973. Three new species of Eohaustorius (Amphipoda, 

Haustoriidae) from the Oregon coast. Crustae. 25(3) :253-260. 

Bousfield, E. L. 1979. The amphipod superfamily Gammaroidea in the 

northeastern Pacific region: systematics and distributional ecology. 

Bull. Biol. Soc. Wash. 3:297-357. 

Brady, F. 1943. The distribution of the fauna of some intertidal sands 

and muds on the Northumberland coast. J. Anim. Eco1. 12: 27-41. 

Durkin, J. T., T. C. Coley, It. Verner, andR. L. Bmmet.t. 1981. Anaquat.ic 

species evaluation at rour selr scouring sites in t.he Columbia River 

estuary. Report to U.S. Army Corps of Engineers, contract DACW57-79-F0145, 46 p. Available Northwest Fish. Sci. Cent., 2725 Mont1ake Blvd. 

E., Seattle, WA 98112. 

Durkin, J. T., and R. L. Emmett. 1980. Bent.hic invertebrates, water quality, 

and substrate texture in Baker Bay, Youngs Bay, and adjacent areas of 

the Columbia River est.uary. Report to U.S . Fish and Wi1c:llife Service, 

contract 14-16-009-77-939. Available Northwest Fish. Sci. Cent., 2725 

Mont1ake Blvd. E., Seattle, WA 98112. 
30 


Haertel, L., and C. Osterberg. 1967. Ecology of zooplankton, benthos and 

fishes in the Columbia River estuary. Ecology 48:459-472. 

Higley, D. L., and R. L. Holton. 1975. Biological baseline data, Youngs Bay, 

Oregon, 1974, Final report, 11 Nov. through 30 Apr. 1975. Oregon State 

Univ., 91 p. Available Oceanography Dept., Oregon State Univ., 

Corvallis, OR 97331. 

Higley, D. L., and R. L. Holton. 1978. A grab-sample study of benthic 

invertebrates of the Columbia River estuary. Supplemental data report 1 

Nov. 1975 through 29 Feb: 1976. Oregon State Univ., 27 p. Available 

Oceanography Dept., Oregon State Univ., Corvallis, OR 97331. 

Higley, D. L., R. L. Holton, and P. D. Komar. 1976. Analysis of benthic 

infauna community and sed~entation patterns of a proposed fill site and 

nearby regions in the Columbia River estuary. Oregon State Univ., 78 p. 

Available Oceanography Dept., Oregon State Univ., Corvallis, OR 97331. 

Higley, D. L., J. B. Morgen, and R. L. Holton. 1979. Biological baseline and 

fluoride effects data for Youngs Bay, Oregon, 1974-1975. Supplemental 

final report, 1 Nov. through 30 May 1975. Oregon State Univ., 133 p. 

Available Oceanography Dept., Oregon State Univ., Corvallis, OR 97331. 

Holton, R. L., D. L. Higley, M. A. Brzezinski, K. K. Jones, and S. L. Wilson. 

1984. Benthic infauna of the Columbia River estuary. Columbia River 

Estuary Data Development Program, CREST, Astoria, OR, 179 p. plus 

appendices. 

Jones, K. K. 1984. Annual secondary production and community dynamics 

of benthic infauna in a Columbia River estuary mudflat. M.S. Thesis, 

Oregon State Univ., Corvallis, OR, 63 p. 
31 


Lewis, J. R. 1961. The littoral zone on rocky shores, a biological and 

physical entity. Oikos 12:280-301. 

McCabe, G. T., Jr., R. L. Emmett, T. C. Coley, and R. J. McConnell. 1986. 

Distribution, abundance, and size-class structure of Dungeness crabs in 

the Columbia River estuary. Final report to U.S. Ar.my Corps of 

Engineers, contact DACW57-84-F-0178, 57 p. Available Northwest Fish. 

Sci. Cent., 2725 Montlake Blvd. E., Seattle, WA 98112. 

Neal, 	v. T. 1972. Physical aspects of the Columbia River and its estuary. 

1n A. T. Pruter and D. L. Alverson (editors), The Columbia River Estuary 

and Adjacent Ocean Waters, p. 19-40. Univ. Wash. Press, Seattle, WA. 

Orth, 	R. J. 1977. The importance of sed~ent stability in seagrass 

communities. In B. C. Coull (editor), Zcology of marine benthos, p. 

281-300. Univ. South Carolina Press, Columbia, SC. 

Ringold, R. 1979. Burrowing, root mat density, and the distribution of 

fiddler crabs in the eastern United States. J. Exp. Mar. Biol. Ecol. 

36:11-21. 

Sanborn, H. R. 1975. Benthic infauna observed at five sites of the Columbia 

River from August 1973 to July 1974. Final Rep. to U. S. Ar.my Corps of 

Engineers and Columbia River Program Office, 19 p. Northwest Fish. Sci. 

Cent., 2725 Montlake Blvd. Z., Seattle, WA 98112. 

Sanders, H. L., P. C. Manogelsoorf, and G. R. Hampson. 1965. Salinity and 

faunal distribution in the Pocasset River, Massachusetts. L~ol. 

Oceanogr. 10:216-229. 
32 


Smith, R. I., and J. T. Carlton (editors). 1975. Light's manual: Intertidal 

invertebrates of the central California coast. Univ. :Calif. Press, 

Berkeley, CA, 716 p. • 

., 

.., 

I 

Strickland, J. D. H., and T. R. Parsons. 1968. A practical handbook of 

seawater analysis. Fish. Res. Board Can., Bull. No. 167, 311 p. 

Virnstein, R. W. 1977. The importance of predation by crabs and fishes on 

benthic infauna in Chesapeake Bay. Ecology 58:1199-1217. 

Wells, F. E., and D. Roberts. 1980. Molluscan assemblages on an intertidal 

sandflat in Princess Royal Harbour, Western Australia. Aust. J. Mar. 

Freshwater Res. 31:499-507. 

t M tit' ... *1 t '" 
33 


Appendix Table--Numbers and weight (g) of benthic invertebrates collected at 

11 sites in Baker Bay, Columbia River estuarf, November 1980 

October 1981. 

Station la_hI 

Date lIov_r 1110 31AI 17 181 leI 4IAI 17 181 leI $IAI 

17 IBI leI "AI 17 IBI leI 

'I'aaoD 

"rUIIUl.UUIIA 110. 

Wt. 

:I 

0.002 

7 

0.003 + 

4 

0.002 2 0.001 

, 0.003 

, 0.003 , 0.001 

13 0.00$ I 

0.004 

$ 

0.003 

4 

0.002 

'-TKA 110. 

Wt. 

4 

O.Oot 

7 

11.013 

) 

0.004 2 0.00) 1 0.011 

POLYCIIA&"lA 

Bteone d1l.tae 110. 

Wt. 

11 0.031 23 0.0$7 17 0.037 

2 

0.003 

, 4

- 0.004 

1 

0.001 

3 

0.003 

I 

0.007 

2 

0.003 

"e.nthe. l1.n1ao1. 110. 

Wt. 

111 LUI 

10$ 

1.UI 

112 

1.201 

100 

0.412 

112 

0.$0$ 

.1 

0.410 

27 

0.20' 

32 

0.ll5 U 0.410 

)$ 

O.llO 

)7 

0.110 :Ii 

0.170 

P.eudopo1ydora kelOp1 110. 

Wt. 

3 

0.001 

2 

0.004 

3 

0.011 

1 

0.001 

4 

0.003 2 

0.002 

2 

+ 

1 

0.002 

Po1ydora 119111 

Pygo.p1o elegana 

110. 

Wt. 

110. 

Wt. 

n 0.075 11' 0.044 5' 0.025 

17 

0.005 0.001 • 4 0.001 2 

+ 

3 

0.003 

7 

0.002 

2 

0.001 

0.002 • 2 

+ + 

Hetero.••tu. r111rora1. 

HObaon1. r1or1d. 

110. 

Wt. 

110. 

Wt. 

271 

0.'$1 2" 

0.015 

183 

0.4)3 

, 0.012 

$ 

0.004 

4 

0.002 

3 

0.00' 

I 

0.014 

1 0.003 

3 

0.00' 

) 

0.002 

3 

0.002 

CRUS"lACBA 

Bohau.tor1u• ••tu.r.f.. 110. 

Wt. 2 0.004 

, 0.0)4 72 0.U7 21 0.124 21 0.112 31 0.119 

105 

0.110 U 0.041 0.2" " 34 

0.0" '4 0.ll7 

Bog....ru. canrerv1ao1u. 110. 

Wt. 

1 0.004 

Coroph1u. .a1.an1. 110. 

Wt. 

323 0.)04 143 0.146 20 

0.011 3 0.005 2 0.001 + + 

1 0.002 3 0.002 

Coroph1u. .p1n1aorne 110. 

Wt. 

2 

0.00) 

8IVALVIA ".co.a ba1 th1ca 110. 

Wt. 14 

1.111 

21 4.141 10 

0.611 11 2.031 1S 12.0)7 21 

7.3" 

12 1.417 11 

0.1$' 

13 

0.237 11 1.073 13 

2.'41 

22 1.'712 
34 


Appendix Table--Continued. 

atat-lon la_lo) 7111.) IB) IC) 1111.) IB) Ie) 1111.) IB) IC) 10111.) IB) IC) 

Date Woveaber 1"0 24 24 24 24 

Taxon 

Tllllll&LLAIUA 	 110. 3 & 5 3 1 2 Itt. + 0.001 0.001 0.002 0.002 0.002 0.002 

HllUnA 	 110. 1 

Itt. 0.005 

POLYCRAI!TA 

Bt.on. dil.t•• 110. 2 5 2 4 2 I 3 3 2 

Itt. 0.004 0.005 0.001 0.003 0.004 0.005 0.004 0.003 

M••nU,es l111111col. 	 110. 52 10 93 112 75 7& 12 17 91 9 10 1& 

Itt. 0.500 1.125 0.545 0.7&1 0.401 0.340 0.532 0.451 0.790 0.066 0.555 0.144 

Gayclnde polygnstb. 	 110. 1 Itt. 0.013 

P.eudopolydor. k..,u 	 110. 6 7 2 14 5 11 21 13 35 10 36 16 

Itt. 0.007 0.027 0.002 0.049 0.031 0.041 0.057 0.038 0.106 0.020 0.049 0.034 

Polydora l1gnl 	 110. 1 1 19 7 12 10 14 12 

Itt. 0.001 0.001 0.143 0.038 0.050 - 0.016 0.032 

Pygosplo eleg.n. 	 110. 3 1 6 6 7 2 

lit. 0.001 - • 0.002 0.001 0.004 0.001 

Hobsonl. tlorId. 	 110. 5 9 5 13 6 , 3 3 4 12 21 10 

Itt. 0.001 0.005 0.004 0.005 0.002 0.003 0.063 0.023 0.004 0.026 0.0411 0.039 

c:RVSTAC:&A 


Hea11eucon ap. 110. 


Itt. 	

Boh.u.torlus e.tu.rl. 	 110. 12 10 14 9 3 2 1 

Itt. 0.060 - 0.013 0.057 0.014 0.013 0.007 

Bog....ru. oel.lrl 	 110. 1 1 

Itt. 0.001 0.001 

Bogs••rus contervlcolus 	110. 4 1 Itt. - 0.004 

Corop/Uwo ..1_1. 	 110. 1 1 1 

Itt. 0.002 0.001 

Corop/llU11 .p1nlcorne 	 110. 2 3 Itt. 	 - 0.002 0.003 

cr.ngon tr.nelscorUII 	 110. 1 

Itt. 0.073 

BIVALVIA 

Cl1noe.rdlU11 nutt.llil 110. 1 

Itt• 0.003 

.._ !NIltb1e. 110. 27 34 ZI 15 22 17 37 32 45 42 n 51 

Itt. 0.294 1.595 1.110 1.047 1.143 0.535 1.4411 0.754 1.671 4.211 1.636 4.440 

"Y' sren.rI. 	 110. 1 1 2 20 31 U 

Itt. 0.111 0.001 0.002 - 0.117 0.051 0.127 

~ 

,

"It 

.., 
• • 

Appendix Table--Continued. 

atation Ca_le) llCA) CB) ce) Dat.e lo..-r 1..0 24 

Taxon 

TllJlB&LIARIA 	 10. 1 1 5 

ft. 0.001 0.001 0.003 

POLYCIIAE'I'A 

Neanthe. 1lanIcoJ. 10. 1 1 

ft. 0.010 0.001 • 

Glyc1nde polygnaeha 	 10. 1 1 

ft. 0.012 0.002 

P..udopolydora kMpJ 	 10. 10 1l 61 

ft. 0.106 o.on 0.214 

Polydora 11",", 	 10. 21 4

ft. 0.04. 0.012 • O.Oot 

Pygo.pl0 elegan. 	 10. 

ft. 

Heeera.a.eu. fJ1Jfor.1. 	 10. 1 1 

ft. 0.013 0.011 

Habtlon1a flodda 	 10. 23 2 ft. 0.025 0.003 

CRUS'I'ACEA 

HaJ.leuCOll ap. 10. 4 4 

ft. 0.001 0.001 

BIVALVIA 

HaCOlN !NIl tb1ca 	 10. 52 .. 11 ft. 2.343 0.110 0.514 

lIIya arenada 	 10. 10 , 6 ft. o.on 0.005 o.on 

35 
: 

~ 

~ 

~ 

., 

.., 


36 

Appendix Table--Continued. 

'~a~10n la_l.) Da~. De..-r ala 31") 11 IB) Ie) 41") 17 IB) Ie) 51") 17 IB) Ie) 61A) 

11 IB) Ie) 

Taxon 

'l'Ullll&LLAIIIA 

1IIUIEJt'fU 

.0. 22 Irt. 0.001 

.0. 

Irt •

+ 

7 

0.004 

3 

+ 

• 0.002 

• 

2 0.001 2 

+ 0.002 •

+ 

11 

0.002 

3 

+. 

30 0.011 

2 

+ 

3 

0.002 

3 

+ 

3 0.001 

, 

+ 

, 0.003 

2 

+ 

P01.yeIlAll:TA 

Bt.OII. dilat•• .0. 11 

Irt. 0.066 11 0.001 

16 

0.012 • 0.002 

6 

0.00' 

, 0.012 0.003 • 2 0.002 

5 

0.003 1 

0.001 

5 

0.007 

1 

0.001 

Bt.OII. HghU 

S.,ntb.e It.nJcol, 

No. 

Irt. 

No. ,. Irt. 0.376 115 

1.530 31 

0."0 

12 0.622 

73 

0.520 

1 

0.001 

7. 

0.311 32 0.112 25 0.117 40 0.271 14 0.146 27 0.015 23 0.037 

'e.udopolydor, k~ .0. 

Irt. 

1 0.002 3 0.002 2 2

- 0.003 1 0.003 2 0.002 2 0.003 1 

+ 

2 0.001 1 0.002 

'olydora Hpj .0. 

Irt. 

1 0.002 2 0.002 

'YVOIpIO .l.g,ne No. 125 

Irt. 0.057 

2a 

0.011 

55 

0.025 

• 10 

0.003 

I 

0.003 + + + + 

Bobaonl. florid. •0. 103 Irt. o.on 101 0.012 

70 

0.051 • 0.006 6 0.015 5 0.01. 3 1 0.003 1 0.002 1 0.002 

CltUSTAcv. 

Bob.uetorlu• ..tu.rie 

Bog.~ru. oclair1 

.0. 1 Irt. 0.003 

.0. 

Irt. 

Ii 

0.662 

1 0.002 

75 

0.503 36 0.236 13 0.03. 56 0.121 50 0.111 42 0.121 

n 0.3ll .. 0.133 

Bog....ru. conf.rvlcolue .0. 

Irt. 

1 

0.001 1 0.010 

1 0.001 1 0.002 

Cor~ua e,l8Onle .0. 

Irt. 

a 0.001 15 0.012 131 

0.0" 

2 0.001 

3 

0.003 

2 0.005 

IMRCTA 

Dol1chopocl1da. 

Ch1ronoa1clae 

.0. 

Irt. 

.0. 

Irt. 

I 

+ 

1 0.001 

I 

0.005 

BIVALVIA 

"'_ baltblc. No. 

Irt. 

21 0.160 3. 0.663 11 2.716 32 

5.nl 

31 7.754 31 

6.165 13 1.113 10 0.731 7 

0."5 l' 1.015 21 11 5.541 0.112 
37 


Appendix Table--Continued. 

ac.at-lon (••Japl.' Date _1'19.0 

7(AI 

17 

(8) (e) I(AI 

22 

(8) (e) 9(A) 

22 

(8) Ie) lOlA) 22 (8) (e) 

Taxon 

TVJIIIKI.1.AIIIA Bo. 

lit. - 5 0.001 

3 

0.001 

_TEA Bo. 

lit. 

1 

0.004 

POLTeHAJ:TA 

Bteone ,Ul.t•• Bo. 

lit • 

2 

0.003 

1 

0.001 

1 

0.001 

4 

0.003 

2 

0.003 

".nth.. l1.n1eol. Bo. 

lit. 

n 0.305 

47 

0.311 o.nl " U 

0.245 

103 

0.770 

31 

0.321 

37 

0.3" 

U 

0.171 

34 

0.136 

9 

0.100 

12 

O.ln 

21 

0.432 

' ..ullopolydor. Ir..,n Bo. 

lit. 

1 

0.001 

6

- 6 

0.003 

17 

0.030 

, 0.007 

15 

0.0'2 

at 

0.057 

13 

o.on 

17 

0.05' 

14 

0.011 

16 

0.026 

It 

0.011 

,olytlor. l19111 Bo. 

lit. 

, 4 

- 0.032 

22 

O.UI 

23 

O.OtO 

11 

0.056 

26 

0.0" 

11 

O.Oat 

37 

0.053 

'ygo.p1o .l.g.n. Bo. 

lit. • 4 

0.002 

t 

0.001 

Hetoro...tu. f1l1fora1. Bo. 

lit. 

1 

O.OO~ 

4 0.Ot1 1 0.003 1 

0.011 

Robeon1. flor111. Bo. 

lit. 

2 

0.004 

1 

0.002 

4 

0.012 . , 0.005 

7 

0.013 

I 

0.033 

11 O.OU • 0.012 

11 

0.061 5 

0.007 

25 

0.056 

CltV.TAC&A 

-..1lo_ .... 

Bohou.tor1u. o.tu.rI. 

Bo. 

lit. 

Bo. 

..~. 

3 

0.00' 

, 0.030 

• 

2 0.001 3 

0.018 4 O.Olt 1 

0.003 2 

0.00' 

3 0.004 1 

0.005 

Bog....ru. ocl.irl Bo. 

lit. 

1 0.001 

Eog_ru. conforvlcolu. Bo. 

lit. 

1 

0.002 

3 

0.00' 

5 

O.OU 1 

0.002 1 

0.013 

Bo9....ru••p. 

lyo_1 

or .pp. Bo. 

lit. 2 

0.004 

Corop/lIua ••l_l. Bo. 

lit. 

1 0.002 3 0.003 2 0.001 1 0.003 3 0.004 2 

0.002 

Corop/ll,. .pInlcorftO Bo. 

lit. 2 

0.001 

11 

0.007 

8IVALVIA 

"YUlue Hulie 

.... eoIia .belWca 

Bo. 

lit. 

... 

lit. 

16 2.134 

24 

1.344 

21 

1.236 

31 

3.672 

20 

0.835 

14 

1.170 

24 

2.211 

2l 

1.6" 

22 

1.31. 

34 

3.377 

3 

0.011 

60 

3.274 

60 

4.025 

"Y. .ron.rl. Bo. 

lit. 

1 

0.021 1 0.001 3 0.037 34 

0.154 0.060 " 50 

0.7" 
8 

38 


Appendix Table--Continued• 

• ~U10n Ca_le, llCA, CB, ce, Dat.. De_r 1110 22 

Taxon 

POLYCIlAltTA 


Bt.on. l1ght1 No. 


lit. • 

Qlyc1nd. polygnatha 	 No. 1 

lit. 0.00' 

l'••udopolydora /rnpj 	 No. 31 .4 .0 

lit. 0.127 O.UI 0.30' 

l'olydoro l1gn1 	 No. 1 2 

lit. 0.002 0.004 

Heter0.8.tu. r111r"rat. 	 No. 1 

lit. 0.011 

CRV.~ACBA 

H..uleuCDII .p. 	 No. .. 10 lit. . 0.002 0.001 

Crongon fronc1.corua 	 No. 1 

lit. 0.002 

BIVALVIA 

Haeoaa bal th1cI No. S 11 10 

lit. 0.332 0.713 0.274 

"Yo ar.nar1a 	 No. 4 5 

lit. 0.004 0.009 

~ 

• 
39 


Appendix Table--Continued. 

SU"io" Ca_l.) Date Ja"..ary all 

2CA) 

12 

CB) ce) 3CA) 

12 CB) ce) 4CA) 12 CB) ce) 5CA) 12 CB) ce) 

'l'aaon 

TVJtBSLlAIUA Ko. 

ft. 

21 0.005 125 0.050 55 0.044 41 0.010 II 

0.003 31 0.012 0.001 • • 0.001 

, 0.002 0.003 • 7 0.003 

_T&A Ko. 

ft. 

2 

0.003 

2 

0.003 

2 0.003 2 

0.005 

1 

0.024 1 0.003 

POLYCIIAII!TA 

Staon. dilato. Ko. 

ft • 

5 0.025 5 0.010 4 0.003 10 0.030 21 0.072 21 

0.051 

7 

0.012 II 0.012 15 0.024 3 0.002 3 0.002 5 

0.00' 

•••nthe. ll.nlcola Ko. 

ft. 

30 0.&3& 23 0.412 1& 

O.UO 

t5 

l.Ul 

It 

1.425 

12 0.313 70 

0."0 

70 

0."7 

&7 

0.410 30 0.305 30 0.M2 32 

0.357 

P....dopolydor. k.-p1 

pygo.p1o .l.g.n. 

Ko. 

ft. 

Ko. 

ft. 

It 

0.0&0 

234 

0.143 

llO 

0.070 

15 

0.011 

• 

III 

0.117 

74 

0.017 

5 

0.002 

3 

0.001 

1 

0.003 2 0.005 

H.c.r....tu. flllforat. Ko. 

ft. 

1 0.003 1 0.003 

Hobsonl. florlda Ko. 

ft. 

lU 

0.01l 103 0.230 71 0.415 122 0.4'1 

10 0.300 35 0.131 0.004 • 5 O.Oll 

5 0.014 1 0.005 1 0.005 2 0.003 

eRUSTAC&A 

Gnorl...pha.r... lut•• Ko. 

ft. 

1 0.007 

Bob....toriu•••tu.ri. Ko. 

ft. 

5 

0.025 1 

0.005 

& 

0.041 1 0.00& 

& 

0.031 

& 

0.034 

30 

0.207 45 0.215 &0 

0.351 

107 

0.210 U o.on 

&3 0.15, 

Boga_ru. ocldrl Ko. 

ft. 

1 0.010 4 0.025 

Bog_ru. conf.rvlcolu. Ko. 

ft. 

10 0.027 72 

0.1" 

177 

0.451 

4 0.004 • 2 

Bog._.ru. ap. or app. Cyounq) 

Corophiua ••l.on1. 

Ko. 

ft. 

Ko. 

ft. 

21l 

0.3" 

21 0.021 

175 

0.251 

I 

0.001 

155 

0.201 11 0.012 

, 0.00& 12 

0.00' 

2 

0.002 

1 

0.002 

1 

0.001 1 1 

0.001 

Crangon fr.nci.corva Ko. 

ft. 1 

0.031 

IKSI:CTA 

Delichopodi.... Ko. 

ft. 

3 0.00' 1 0.002 1 0.003 

ChironoaJ..... Ko. 

ft. 

104 

0.051 112 0.0&7 14 0.041 2 0.003 • BIVALVIA 

..._ belth.fca Ko. 

ft. 

3 0.045 1 0.015 2t 

2.411 34 

2.'50 

20 3.4n 34 5.527 2' 2.714 32 

2.275 10 

1.". 

, 0.120 5 

0.323 

Myo or.nori. Ko. 

ft. 

1

• 1 0.003 1 0.003 
Appendix Table--Continued. 

l~a~10.. (.....1.) I (A) (B) (e) 7(A) (B) (e) I(A) (B) (e) '(A) (B) (e) 

Da~. January nil 12 12 U U 

" ••OD ~LLARIA .0. 2 

ft. 0.001 • • 

_'I'M 	 .0. 2 2 1 1 1 ft• 0.023 0.001 0.004 0.001 0.003 

.aLYCIIAIi'l'A 

.toano cUJ.t•• .0. 1 3 1 1 1 1 2 2 7 7 I ft. 0.002 0.002 0.003 0.001 0.003 0.001 0.001 0.002 0.001 0.011 0.011 

___nth.. JJ.nIaoJ. 	 .0. 15 23 12 40 JI .. n 11 15 31 31 t2 ft. O.ltt 0.211 0.051 0.111 0.101 0.412 0.211 0.713 0.5ot 0.4" 0.011 0.tl3 

' ••udopoJ)/dor. hIIp1 	 .0. 1 1 1 1 10 I 13 35 t2 41 ft. 0.002 0.002 0.003 0.002 0.022 0.013 0.022 0.111 0.120 0.110 

.0. , 'olJldor. JIgn1 	 2 I • ft. 0.015 0.025 o.on 0.015 

'ytJOIp1o .J~n. .0. 4 3 4 2 3 2 ft. 0.002 0.003 • 0.002 0.001 0.001 • 

H.t.r....tu. ~IJI~or.1. .0. 2 ft. 0.043 

H~oni. ~Jorid. .0. 1 2 1 1 1 15 11 3 21 22 25 ft. - 0.003 0.002 0.002 • 0.014 O.Otl 0.00l 0.031 0.012 0.053 

CIlVI'I'ACKA 

IIooayd. _rcocU. 	 .0. 1 ·ft. 0.024 

s-1J.uaon 'p. 	 .0. 1 1 

ft. • • • Db.u.toriu. ..tu.rI. 	 .0. .. II n 11 14 7 1 2 2 1 

ft• 0.211 0.2" 0.142 0.015 0.011 0.032 0.004 0.003 0.013 0.005 

• 1I9._ru. con~.rvIaoJu••0. 3 1 1 4 

ft. - 0.00l 

Co~u. ••J.onI. 	 .0. 1 1 1 3 

ft. 0.004 0.001 0.001 0.003 

Corop/II.. •p1n1CDn1. 	 .0. I 2 

ft. 0.005 

BIVALVIA 

..._ bdthIw .0. 11 1& 10 20 15 II n 41 34 .. n 21

ft• 1.'31 0."3 0.'" 1.011 0."0 0."2 1 .... 3.302 1.732 2.435 3.0tt 1.41'

ffy. •ron.rI. 	 .0. 1 2 10 4 

ft. 	 0.001 0.00' 0.032 0.00l O.Otl •

40 


•

~ 

,
41 


Appendix Table--Continued. 

lOCAl 

2' 

• 

I 

o.on 

22 

0.011 

• 0.021 

1 

0.003 

4 

0.004 

21 

2.114 

24 

0.035 

eBI 

5 0.003 

19 

0.1'2 

55 0.0344 

4 

0.001 

3 

0.211 

34 

0.041 

• 

2 

0.001 

3' 2.113 

2' 0.042 

eCI 

2 

0.003 

5 0.021 

11 

0.00' 

3 

0.005 

3 0.055 

32 

0.121 

1 

0.002 

• 

<Ii 

2.513 

52 1.000 

11 CAl CBI eCI 2' 

1 1 0.001 0.001 

1 1 

0.002 0.001 

1 2 

0.001 0.003 

1 3 

0.007 0.041 

II 12' 

0.373 0.371 " 0.477 

1 1 

0.002 0.003 

5 

• 3 

0.003 0.005 

li 52 71 0.011 0.011 0.032 

1 2 0.001 0.021 

2 

0.005 

1 2 0.002 0.001 

1 0.001 

1 

• 0.001 

-

2 0.001 1 

31 iZ 37 

3.'07 '.437 4.101 

5 2 4 

0.004 - 0.030 

Station C._leI Date J.n...~ nil 

Taxon 

~IA 

POLYCllA&rA 

.teone dH.t.. 

Ne.ntbe. lianicola 

Glyeinde polygn.tb. 

Peeudopolydor. t..,u 

Polydor. Hgn1 

PY9o.~o Ileg.n. 

Hlt.ro.e.tu. tilitoral. 

Hob.oni. tlorid. 

CRUarACU 

H.-1leucon ap. 

Boh.u.toriu•••tu.ri. 

• og ....ru. oel.iri 

Eog....ru. contervicolu. Mo. 

lit. 

Coraphiv. ••1.an1. .0. 

ft. 

Coroplliv. .~nicortll .0. 

Wo. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

Wo. 

ft. 

.0. 

ft. 

Wo. 

lit • 

Wo. 

ft. 

&0. 

lit. 

&0. 

lit• 

Mo. 

lit. 

IMSECTA 

Chlrolu_ld•• 

BIVALVIA 

Ifyell u. eeluH. 

..._ bIIltbi... 

My. erenede 

ft. 

&0. 

ft. 

Wo. 

ft. 

.0. 

ft. 

.0. 

ft. 
42 


Appendix Table--Continued. 

Bcaclon Ca....l., 

Dac. rebruary 1.11 lCA' 

21 ca, ce, 2CA, 10 ca, ce, 3eA, 10 ca, ce, 4CA' 

10 ca, ce, 

Taxon 

'lIIIUI&LLARIA 	 80. 

Irt. 

4 

• 0.002 

]5 

0.022 

, D.DDZ - ] 

D.DDZ 2 

0.004 

4 

0.001 26 D.DOl 10 0.004 

_'rEA 	 80. 

Irt. 

] 

0.021 

] 

0.00' 

2 D.DDt 5 D.Dn 1 0.002 

] 

0.003 

POLyeHAETA

Bt.on. cUl.ta. 80. 

Irt. 

1 D.DOl 4 

0.010 2 0.002 

7 

0.0]5 11 0.124 10 

0.03' 

, 0.01' 

5 

0.004 12 0.0]0 15 D.DU 11 0.075 

20 

D.Dn 

".anth•• 11Jlnicola 	 80. 

Irt. 

1 20 D.UD 51 0.452 4 0.144 54 0.246 55 0.324 :It 

0.161 76 1.410 62 1.111 14 1.126 

P.audopolydora bap1 	 80. 

Irt. 

1 0.001 1 0.00] 

Polydora 11gn.1 	 80. 

Irt. 

1 

0.001 

Pygo.p1o .l.gan. 	 80. 

Irt. 	

U 

0.024 It 0.026 1 0.00] 4 0.002 Z 

• 5 0.002 0.035 " 	 115 0.021 

I] 

0.01]

BoMon1a flodda 	 80. 

Irt. 

U 

• 0.041 

Sf 

0.11] 

] 

0.00' 

1 

0.00l 2 0.007 

]2 

0.211 0.22' " 12 

0.111 0.22' " CRVaTACP. 

HIII11._ ap. 	 80. 

Irt. 

2 0.001 

Gnorl.o.pba.roaa lut.. 	 80. 

Irt. 

1 

0.011 

1 2 

0.041 

Bohau.tor1u•••tuari. 	 80. 

Irt. 

2 

0.012 

] 

O.OU 5 0.0]5 

I 

0.055 

1] 

0.012 21 O.ltt 54 

0.310 

41 

0.214 

1 4 

0.00' 0.026 

1 O.OOt 

Bog....ru. oclairi 	 80. 

Irt. 

1 0.002 7 

0.071 2 0.010 

Boga_ru. conf.rv1colu. 80. 

Irt. 

22 

0.0'1 ]' 

0.16] 24 0.10] 1 . 0.003 

1 

0.001 

CoropbjUli .a.z.onJ. 	 80. 

Irt. 

216 0.412 liD 0.262 67 1 

0.0'5 0.00l 

27 It 

0.021 0.011 

]4 

0.022 

CoropbI.. • p1nIcom. 	 80. 

Irt. 

2 0.00] 

IIISKCTA 

Dol1chopocU.cIa. liD. 

Irt. 

, 0.01' 

I 

0.015 

] 

0.011 

5 0.011 2 0.010 

4

0.017 

eh1rono.1c1a. 	 80. 

Irt . 

12 0.005 2 0.001 126 

0.0'0 

57 

0.0l' 

5t4 0.526 4 2 0.00] 0.002 

BIVALVIA 

1Ia.,.,.. baltlUca 80. 

Irt. 

2 

0.02' 

1 0.415 

34 

+ 1.271 

]0 

'.641 

1] 

5.41] 41 41 

' ••0. '.260 2' 1."5 

Ifya aranada 	 liD. 

Irt. 	

1 0.001 

•

-t 

-t 

•
43 


Appendix Table--Continued. 

8tatl_ Ca_le, Date February 1111 5CA, 

10 CB, cel aCA, 

10 CBI ce, 7CA, 10 CB, ce, ICA, 

27 CB, ce) 

T.xon 

,--LLIUIIA KO. 

ft. 

3 

0.002 

4 

0.001 • 1 0.001 

_'l'&A Ko. 

ft. 2 0.00. 1 0.001 2 0.003 4 0.018 

POLYClIAIlTA 

Be...". dilaea. Ko. 

ft. 

2 

0.005 1 0.004 4 0.010 3 0.002 1 0.002 1 0.001 

1 0.001 2 

0.003 1 0.003 • 1 0.002 

••a"th•• l111111eola KO. 

ft. 

23 24

- 0.377 41 0.113 24 0.170 23 0.257 22 0.252 70 1.001 51 

0.571 <II 0.522 33 0.427 41 

0.4" 

<It 1.062 

P••udopolydora It•• KO. 

ft. 

4

• 2 0.005 4 0.004 1 0.001 3 0.007 2 0.003 12 0.03. 35 0.120 1t 

0.055 

Polydora 119111 KO. 

lit. 

1 

0.001 

Pygo'Jdo .l.gan. Ko. 

lit. • 2 0.001 1 0.001 • 2 0.001 1 0.001 3 0.001 • Hobaonia florida Ko. 

lit. 

2 0.006. 1 0.002 3 0.006 1 0.003 2 0.003 5 

0.001 5 0.011 10 

0.00' 

OUBTAC&A 

H.lI1l.ueon ap. Ko. 

lit. • • 1

• 

Saduri• • neOllOJl Ko. 

lit. 

1 O.ll' 

Eahau.tor1u••aeuar1. Ko. 

lit. 

IS 

0.211 <It 0.166 

22 

O.OU 31 o.on 

70 

0.251 

.5 

0.340 

4 

0.023 

2 O.OOl 5 

0.024 2 

0.013 

Eoga_aru. conf.rv1eolu. Ko. 

lit. 

3 0.001 

Coroph1u. ••l8OD1. Ko. 

lit. • 1 0.001 1

• BIVALVIA 

IfyUlu. Hul1. Ko. 

lit. 

1 o.ooa 

Ifa..- bdtb1ca Ko. 

lit • 

11 1.103 17 2.371 

II 3.136 II 

1.H2 17 

2.71' 

17 

1.141 13 

1.57' 

lI2 

1.700 18 

1.'23 

53 

1."3 

42 2.141 5$ 

1.375 

Ifya arenar1a KO. 

ft. 1 0.003 2 0.004 
~ --------.-----~~.--------

44 


Appendix Table--Continued. 

SU"lon ("'"Plel 1111.1 (81 (el 10(11.1 (81 (el 11(11.1 (81 (el Dat.. February Ull 27 27 27 

Taxon 

POLyeHAZTA

Btoono d1lltlo No. 1 1 4 2 3 5 2 ft. 0.002 0.002 0.002 0.005 0.014 0.005 

Btoono J1ght1 	 No. 1 ft. 0.001 

"olntho. H ...1cola 	 No. 41 44 51 , 13 2 2 1 ft. 0.541 0.654 0.554 0.115 0.161 0.001 0.013 0.014 

Hoa1podu. boroa11. 	 No. 1 1 1 

ft. 0.007 0.011 0.00.. 

Psoudopolydon kap1 	 No. 7 11 11 I 21 31 33 31 12 ft. 0.001 0.016 0.045 0.003 0.021 0.045 0.001 0.101 0.311 

Polydora Hgn1 	 No. 3 3 3 4 1 1 

ft. 0.010 0.0:13 0.00" O.OlD 0.004 0.004 

Pyvosp1o ologln. 	 No. 4 ft. 0.001 • 

Hotora.a.tu. f111forai. 	 No. 1 1 1 1 1 

ft. 0.001 0.001 0.027 0.003 0.005 

Hob.on1a flor1dl 	 No. , .. 21 20 32 1 2 

ft. 0.032 0.017 0.0"0 0.044 0.053 0.004 0.003 

c:JlVaTACZA 

IIooayd. _readi. No. 

ft. 

Holdloucon Ip. 	 No. 21 21 11 ft. 0.010 0.001 

Gftort.o.phlora.. lutoa 	 No. 1 2 ft. 0.004 0.012 

Eohau.tor1us ••tulr1. 	 No. 4 1 2 1 

ft. 0.014 0.003 0.005 0.002 

Boga_ru. ocla1ri 	 No. 1 1 1 

ft. 0.001 0.001 0.045 

Boga_ru. conf.rv1colu. 	No. 1 3 

ft. 0.003 0.005 

Coroph1u. .a~1. No. 2 2 1 3 1 

ft. • 0.00.. 0.001 0.001 0.005 0.002 

Corop/l1....p1n1corno 	 No. 

ft. • 

Cancer ..g1stor 	 No. 1 

ft. 0.132 

BIVALVIA 

fryt1lu. odul1. No. 

ft. • Haca.a balthica 	 No. 37 33 40 51 60 51 3t 41 51 

ft. 5.264 2.tOl 4.221 4.610 2.'''' 3.257 1.101 3.191 4.tll 

fryl Ironaria 	 No. 2 53 55 34 1 6 

ft. 0.033 0.120 0.200 0.543 0.001 • 

~ 

~ 

..... ..... 
45 


Appendix Table--Continued. 

Station (a_1e) 

Date llarcl> 1111 

2 (AI 

13 

la) (e) 3(A) 

13 

(a) Ie) 4 (A) 

13 

(a) (e) 5IA) 

13 

ca) ce) 

" ..on 71IJIII&l.LIIIIIA 

_ftA 

.0. 

ft. 

.0. 

ft. 

3 

0.001 

1 

0.002 

1 

+ 

5 

0.002 

10 

0.004 

1 

+ 

+ 

+ + 1 + 

12 10 

0.004 0.003 

2 3 

- 0.012 

P01.YClUlltTA 

Bt_ tUlataa 

N.antb.. It.n1cola 

' ••udopolydora ke.p1 

.0. 

ft • 

.0. 

ft. 

.0. 

ft. 

II 

0.0'4 

3 

0.0" 

20 

0.011 

2 

0.010 

11 

o.on 

22 

0.4" 

, 0.011 

33 

1.025 

16 o.on 

III 

1 ....' 

1 

0.038 

21 

1.142 

1 

0.003 

6D 

0.551 

, 0.013 

53 

0.42. 

, 0.014 

0.511 " 

2 

0.003 

3 

0.00' 

20 

0.311 

3 

0.003 

21 

0.210 

1 

0.002 

53 

0.121 

1)9o.~0 .l.van. .0. 

ft. 

n 0.015 

11 

0.005 

U 

0.011 

4 

0.001 

111 

0.021 

40 

O.Oot 

4 

0.001 

, 0.002 

2 

+ 

1 

+ + 

1 

+ 

Hobaon1a tlor1da .0. 

ft. 

14 0.010 1 

+ 21 0.253 

31 0.013 11 0.1.2 15 0.240 3 0.00. 1 0.006 1 0.003 4 0.011 

eRUSTAC&A 

Hnoil.ucon ap. 

Bohau.tor1u•••tuar1. 

.0. 

ft. 

.0. 

ft. 

21 

0.1" 

31 

0.255 

6 

0.033 

1 

0.006 

4Ii6 

0.542 

54 

0.3" 

22 

0.101 

2 

0.001 

33 

0.111 

30 

0.011 

+ 

3D 

0.011 

JIo9a_rua cont.rv1colu••0. 

ft. 

I 

+ 0.001 

4 

0.002 

2 2 

0.001 

, 0.002 

Corop/l1,. .aJ.oft1. .0. 

ft. 

5 

0.001 + 1 

0.003 

12 

0.00' 

55 

0.041 

16 

0.012 

3 

0.006 

1 

0.002 

3 

0.004 

1••ECTA 

Do1ic1>opod1d•• .0. 

ft. 

2 

0.00' 

1 

0.00' 

1 0.005 3 0.006 

I 

0.00' 

Ch1ronca1d•• .0. 

ft. 

5. 

0.040 

61 

0.050 

40 

0.021 

23 

0.010 

10 

0.004 

10 

0.001 

aIVA1.VIA 

""..... blaltll1",a .0. 

ft. 

4 O.36a 

2 

0.21' 

1 

o.ooa 

, 36 3.023 4.261 10 1.••, 36 1.541 33 36 1.11a 10.400 31 

0.156 

11 

2.553 

11 

4.013 
46 


Appendix Table--Continued. 

atatioD 1__10) 

Dato ...reb 1,n 

51A) IB) 

13 

Ie) 71A) 

13 

IB) Ie) IIA) 

2& 

IB) Ie) "A) 

2& 


IB) Ie) 


If••on TUlUlliLLAIIIA 	

_ftA 

.0. 

1ft. 

.0. 

1ft. 

2 

• 0.001 

2 0.010 

2 0.002 

2 
 0.011 

• 1 
• 


POLYCIIAI:'l"A 


Bteono cUlot.. .0. 

1ft • 

2' 3 0.005 0.004 4 0.002 1 2 

0.002 0.003 1 2 2 
 0.002 0.002 0.002 


••onth.o l1.n1colo 	 .0. 

1ft. 

U 

O.to. 

2. 

0.7" 

7 0.121 5. 0.507 0 

1.35' 

50 

1.21' 

44 

0.7" 2' 0.727 30 42 0.lt4 0.512 32 0.'13 

34 


0.'" 


' ••udopolydoro karp! 	 .0. 

1ft. 

1 

0.002 • 1 0.002 

4 

0.011 1 0.007 

2 15 

- 0.042 

, 0.027 10 
 0.012 


.olydoro Hpj 	 .0. 

1ft. 

1 0.004 4 0.015 4 0.02& 1 
 0.007 


'Y908Jdo .l.gon. 	

Bobaon10 ~lor1do 

.0. 

1ft. 

.0. 

1ft. 

5 0.001 

4 0.012 

3 

• 

1 0.001 

4 0.001 

1 0.002 

2 

• 

1 0.002 4 0.016 

1 

• 

3 

0.00' 

• 

, 0.005 

2 

• 

, 0.005 

3 
 0.001 

11 0.031 11 


0.02' 


CIlUa'l"ACKA 

IIea1l._ op. 	 .0. 

1ft. 

BoIIou.todu•••tuod. 	 .0. 

1ft. 

• 

72 

0.250 

50. 

O.Olt 

40 

0.150 • 0.035 

15 

0.050 

15 

0.015 

1 

0.016 

1 

0.00' 

1 

0.005 

2 

0.005 

4 

0.031 

4


0.02' 

Bog_ru• ....,,~orv1colu••0. 

1ft. • 3 
 0.005


CDrGFb1U8 .ol.an1. 	 .0. 

1ft. 

1 

0.002 1 0.002 

1 0.002 2 0.005 

3 

0.004 2 
 0.003 


CorGFb1....Jdn1corn. 	 .0. 

1ft. 

2 
 0.004 


Crongon op. 	 .0. 

1ft. 

3 
 0.007 


BIVALVIA 


.._belW.,. .0. 

1ft. 

17 

1.1'3 

21 

1.'" 2' 3.151 2' 2.715 

33 

3.000 3' 1."7 

34 0 .... 12 

2."2 

32 0.451 

105 2.lt7 70 3.2&0 '5 
 2.'" 


"Yo or.nor10 	 .0. 

1ft. 

1 0.212 1 0.001 1 0.002 4 
 0.041 • 


•

lit

•
47 


Appendix Table--Continued. 

lta"loft C._~.' Da". ",..ch 1"1 

lOCAl 21 CBI lei lllAI 

2' 

IBI cel 

Taxon 

POLyellAl:TA 

Bt.on. tUlata. No. 

ft. 

I 

+ 0.014 4 0.001 Z 0.003 

N • .,.tbea 1111111coJa 	 No. 

ft. 

12 11 

0.1" 0.170 13 2 0.117 0.004 1 0.002 

Hea1podua boreall, 	 No. 

ft. 

1 0.011 

Pa.udopolydora k....,u 	 No. 

ft. 

n 11 

0.012 0.021 

11 '5 0.027 0.0'3 10 

0.301 '0 0.230 

Po1ydora 119111 	 No. 

ft. 

2 1 

0.00' 0.005 

2 1 0.010 0.006 1 0.011 1 0.004 

PygoapJ.o el.g.,.' 	 No. 

ft. 

2 7 

+ 0.003 3 .001 

Hetera..atua f111foraia 	 No. 

ft. 

1 2 0.003 0.045 1 2 0.012 0.003 3 

0.004 

Ho~onla flor1da 	 No. 

ft. 

10 10 0.041 0.032 

, 3 O.OU 0.005 3 

0.005 

2 

0.002 

c:JlU8TAC:&A 

He.11eucon 'p. 	 No. 

ft. 

II + 0.005 32 

0.010 

5 

0.002 

Bohauator1ua eatuar1a 	 No. 

ft. 

1 0.004 1 0.003 2 0.001 

Bog....ru. conferv1colu••0. 

ft. 

1 0.002 

Coropb1u. aalaOll1, No. 

ft. 

1 

0.002 

3 

0.007 

BIVALVIA 

Ifytllu, Hul1a No. 

ft. 1 0.002 1 

0.001 2 0.001 

..._ 1M1tb.1ca No. 

ft. 

n 1.'55 

71 6.213 59 3.026 13' 5.'25 1'5 

2.715 11 5.121 

Ifya arenar1a No. 

ft. 

21 0.113 21 0.136 22 0.186 + 

3 

0.011 

, 0.024 
48 


Appendix Table--Continued. 

atation 18_1.) 21A) IB) IC) 31A) IB) IC) 41A) IB) Ie) 51A) IB) IC) 

Date April I'll 10 10 10 10 

Taxon 

TIlllllELLAJlIA 	 No. 3 5 3 12 lit. 0.001 0.003 + + + 0.002 + 0.006 + 

JlBllEATEA 	 No. 1 1 1 lit. 0.00' 0.007 0.004 

POLYCIlAll:TA 

Bt.one dil.t•• No. 10 2 14 2 5 3 3 3 5 5 , lit. 0.021 + 0.002 0.043 0.027 0.00$ 0.010 0.004 0.003 0.006 0.005 0.004 

M••nth.. 11.n1col. 	 No. 3 12 31 54 51 4& 52 40 11 lit. 0.077 0.154 0.102 1.254 0.713 0.5" 0.614 " 	0.543 0.410 1.&32 O.UO " " ••udopolydor. kellp1 	 No. 1 1 lit. 0.003 0.004 

"No.pl0 .1.g.lI. No. I 1 20 II .2 60 1 5 2 3 5 

lit . 0.002 + 0.004 0.024 0.020 0.014 + 0.001 • 0.001 0.001 

Robaon1. florid. 	 No. 14 2 30 11 45 50 1 2 1 3 6 1 

lit. 0.145 0.001 0.2&1 0.11t O.Otl 0.160 0.004 0.007 0.004 0.01' 0.042 0.004 

CRU8TACEA 

Rndl.ucon 8p. No. 1 

lit. • 0.001 • • • BGb.u.torlu•••tu.r1. 	 No. 16 3 25 3!1 44 22 34 55 

lit. 0.112 0.009 0.131 0.1" 0.160 0.0&1 0.107 0.232 

Bog....ru. oclairi 	 No. 1 

lit. 0.001 EDg._.ru. conf.rv1colu. No. 1 1 	 2 5 1 

lit. 0.001 0.001 	 0.00' 0.026 • 

Coroph1ua ••18OnI8 	 No. Ii 56 124 31 I 3 1 

Nt. 0.002 • 0.123 0.242 0.076 0.015 0.001 0.003 

Coroph1ua .plnlcorn. 	 No. 2 

lit. • 

_ri.... 	 No. 1 

lit. 0.001 

IN8ECTA 

Dolichopodi.... No. 3 3 3 2 

lit. 0.017 0.011 0.014 0.001 

Chirona.1.... 	 No. 349 112 30 7 7 1 

lit. 0.293 0.153 0.017 0.003 0.004 • BIVALVIA 

lflcoae bdtllic. No. 3 16 31 45 40 63 40 41 30 

lit. 0.042 0.473 ....0 13.71' •• 350 3.410 " 7.245 2.010 5."3 1.333 

•

~ 

• 

., 
49 


Appendix Table--Continued. 

nation (a_le) 

Oat_ April 1t11 

6U~) 

10 

(B) (e) 7(1.) 

10 

(B) (e) '(1.) 

23 

(B) (e) 111.) 

10 

(B) (e) 

Taxon 

~LLI\ItIA .0. 

ft. 

2 

+ 0.001 

5 

0.003 

3 1 

+ 

IIIIIIIIUA .0. 

ft. 

2 0.041 

2 

0.015 

2 

0.033 

POLYCIIAII:!A 

Bt...... .ul.t•• 

N.anth.. l!anlcola 

.0. 

ft. 

.0. 

ft. 

I' 2 

0.012 0.004 

21 35 

0.545 0.7" 

3 

0.005 

33 

0.712 

54 

1.310 

1 

0.002 

1."4 " 57 

1.317 

+ 

35 0.,.. U 

0.501 

2 

37 

0.621 

11 

3.000 

1 

0.002 

3t 0.715 

• 

40 

0.115 

•••udopolydora k..,u .0. 

ft . 

1 0.003 

1 

0.002 

5 0.005 2 0.013 3 

O.Oot 

3 0.007 11 

0.05' 

7 

0.020 

• olydora l1gnl .0. 

ft. 

2 

0.010 

1 

0.014 

'ygo.pio el.gan. .0. 

ft. 

3 

0.001 + 

1 

+ 

4 

0.001 

5 

0.001 

4 

0.001 

5 

0.001 

2 3 

0.001 + 

H.tera.aetue tlllto~. .0. 

Nt. 1 0.034 

1 

0.010 

Hobaon1a flor1da No. 

ft. 

2 

0.001 

2 

0.005 

2 

0.005 

7 

0.022 

11 

0.014 

, 0.005 

13 

0.020 

4 

0.021 

I 

0.020 

6 

0.001 

CIIVaTACEA 

HH1l.ucon ap. 

Gnorl.o.pba.ra.a lut•• 

ito. 

lit. 

.0. 

ft. 

1 

0.011 

• 1 

+ 

Bohauetorlu•••tuar1e No. 

lit. 

41 

0.174 '5 0.2" 

53 0.212 4 O.OU 4 0.014 5 

0.024 5 

0.023 

3 

0.01' 

6 0.011 2 0.004 3 

0.01' 

Boga_rue conf.rv1colue No. 

ft. 

2 0.004 I 

0.032 

2 

0.004 2 0.003 

Coropb1u. eal.on1. .0. 

ft. 

2 

0.003 

2 

0.004 

1 

0.002 

2 

0.007 

6 

0.00' 

1 

0.002 

5 

0.001 

3 

0.005 

3 

0.005 

Crangon tranal.cor... .0. 

lit. 

1 0.010 4 0.073 1 0.007 

Coropb1u. ap. (juvenile) No. 

lit. 

1 

0.002 

BIVALVIA 

......... balthlea .0. 

ft. 

35 

2.757 

33 

2.116 

31 

3.1" 

62 

2.'47 

31 

2.050 

57 

4.515 

.1 7.053 17 

3.ot. 53 

1.6" 

64 

2.1U 

101 

2.241 3.622 " 

1Qf • • ranaria .0. 

ft. 

1 

0.007 

1 

0.112 + 

1 

0.002 

1 

0.02' 

1 

0.001 

2 

0.021 

1 

0.027 
50 
 • •

• 

1 

Appendix Table--Continued. 

Stat-lon C • .-pl..) 10CA) (8) Ie) 11CA) (8) Ie) 


Da't.. "PeU all 23 23 


Taxon 

POLyeHUTA 

Bteone d1l.t.e 	 .0. I 1 
 ft. 0.001 0.002 

".nthe. l1an1col. 	 .0. I 12 13 3 
 1It.. 0.066 0.050 0.040 0.032 


Hea1podu. bore.l1. 	 .0. 1 1 


1It.. 	 0.011 0.035 

P.euclopolydor. k"¢' 	 .0. a 23 15 61 79 41 


1It.. O.OU 0.035 0.021 0.312 0.314 0.163 


Polydor. l1gn1 	 .0. 1 3 2 2 1 


1It.. 0.002 0.012 0.003 0.007 0.001 


PyfJo.p1o eleg.n. 	 .0. 2 11 5 


ft. • 0.004 0.001 


Heteroaa.tu. f1l1forat. 	 .0. 2 2 1 2 1 


1It.. 0.021 0.016 0.005 0.005 0.005 


Hobaon1. flor1d. 	 .0. a 21 11 3 4 5 


1It.. 0.043 0.056 o.on 0.005 0.003 0.005 


CRUSTACBA 

Ha1leucon .p. 	 .0. 2 2 6 4 1 
 1It.. • 0.002 0.001 0.001 

••dud. entOllOll 	 .0. 

1It.. • 

Bob.u.tor1u. e.tu.r1. 	 .0. , 2 2 


1It.. 0.0011 0.003 0.007 


Bog....ru. ocl.1r1 	 .0. 3
 .... 	 0.016 

Bog....ru. conferv1colu••0. 	 3 


1It.. 	 0.005 

Coropb1ua ••l.an1. 	 .0. 3 4 2 1 
 1It.. - 0.007 O.OOS 0.001 


Coropb1ua .p1n1corne 	 .0. 1 2 
 1It.. 0.004 O.OOS 


Cr.ngon fruc1.corua 	 So. 1 


ft. O.OOS 


Hyt1lu. edul1. 	 So. 1 


1It.. 0.001 


BIVALVIA 


"'COIN bod th1c. .0. 13 67 U 76 79 52 


ft. 2.010 4.2111 2.071 1.463 O.IIS 2.360 


Ify. .ren.d. 	 So. I 26 15 2 


ft. 0.237 0.417 

• 0.05' 0.033 O.12S 
51 

Appendix Table--Continued. 

.~a~lon C.....1., Da~. Jlay un 2CAI 

21 CBI cel lCAI 21 

CBI cel 4CAI 

21 CBI cel 5CAI 

21 CBI cel 

Taxon. 

TUJI8II:LLAIUA '0. 

Itt. 

l 

0.002 

4 

0.003 + 

3 

0.002 

1 

0.015 

2 

0.001 - it 

0.001 5 

_TIIA '0. 

Itt. 

1 1

- 0.004 1 0.001 

POLYCIIA&TA 

Bt.OII. dJ.lata. '0. 

ft. 

10 

0.021 

I 

0.031 

12 

0.014 

5 

0.006 

1 

0.004 

3 

0.002 

, 0.006 

I 

- 0.011 

3 

0.005 

...nth•• l.t.Ucola 10. 

Itt. 

5 

O.l1lt 

2 

0.111 

2 

0.0'5 ••115 "' M 

1.0" 

55 

1.045 32 

..51' 

40 

O.SM 

40 

0.510 - 72 0.215 42 0.511 

Pygo.plo .l.gan. 10. 

Itt. 

1 

0.001 

230 

0.01' 

11 

0.014 

47 

0.005 

2 

+ 

2 4 

+ - 1 

0.001 

..t.r....tu. fJ.1J.fora1. 10. 

Itt. 

2 

0.013 

Hobaonla florlda 10. 

Itt. 

12 

0.014 12 0.014 1 0.001 

51 O.OU 32 

0.054 16 

0.031 

CJl,U'TACBA

HOIdl.ucon ap. '0. 

Itt. + + 

Pancolu. callforn1.n.l. 10. 

Itt. + 

Bobau.torlu•••tuarl. 10. 

Itt. 

2 

0.003 

221 

0.315 

102 

0.20' 

131 

0.401 

62

- 0.145 

SO 

0.154 

Boga_ru. conf.rvlcolu. 10. 

Itt. 

2 

0.001 2 

- 0.001 

Coropbl_ .daonl. 10. 

Itt • + 

21 

0.014 

51 0.076 U 

0.044 1 

0.002 2 0.004 2 

- 0.003 + 

Crangon fnncl.corua 10. 

Itt. - 1 

0.055 

I ....CTA 

Dol1cbopodl.... 10. 

Itt. 

I 

0.011 

6 0.001 1 

0.013 1 0.005 

Ch1ronoa1d•• 10. 

ft. 

22 

0.013 

22 11

- 0.010 

BIVALVIA 

...-. baltll1ea '0. 

Itt. 

6 

0.162 

3 

1.1" 

1 

0.112 

U 35 

10.431 12.'32 15.515 " U 

5.601 

31 5.214 U 

....2 

20

- 1.4" 

31 

3.1" 
52 


• • 

• • 

Appendix Table--Continued. 

atat.1.on 	 .8..,.1.., 	 ~(AI (81 (CI 7(1.1 (81 (CI 111.1 1., (CI 1(1.1 (81 (CI

Date llay 1111 21 Z1 20 20 

'laaon 

TllR8ll:LLlUUA 	 No. 3 7 11 4 3 

lit. 0.002 0.004 0.001 0.002 0.001 

NDlERftA 	 No. 2 2 1 

lit. 0.022 0.011 0.001 

POLYCHU'rA 

Bteone dU.t.e No. ~, 5 1 4 3 5

lit • 0.005 0.013 • 0.004 	 0.001 O.OOt 0.004 0.004 

.e.nthe. 11anlaole 	 No. 13 U 33 51 40 21 .. 10 U 32 11 ,. lit • 0.U5 0.U7 O.U~ 0.133 0.411 1.174 0.134 0.140 1.lOt O.UO 0.215 0.353 

, P.eudopolydor. ke!lp1 	 80. 1 1 1 2 12 17 Z1 33 

lit. 0.002 0.001 0.001 O.Oli O.OU 0.025 0.053 0.051 0.101 

Polydor. 11gn1 	 80. 1 2 1 

lit. 0.002 0.00' 0.003 

Pygo.pl0 eleg.n. 	 No. 2 ~ 5 1 12 I 4 

lit. • 0.001 0.001 + 0.005 0.004 0.002 

Hetero.a.tu. flllfora1. 	 No. 1 

lit. 0.002 

HobIJonl. florid. 	 No. 1 4 3 1 I 5 4 12 at 11 

lit. 0.005 0.001 0.001 0.003 0.001 0.010 0.021 O.OU 0.011 0.045 

CRUSTACZA 

He..Ueuaon • p. 80 • 

lit. 	 + 

I.opocla 	 No. 

lit. • 

, , Boh.u.toriu. e.tu.ri. 	 80. III 54 50 23 4 3 1 2 1 

lit. 0.123 0.132 0.137 0.014 0.0'1 0.011 0.034 0.017 0.005 0.006 0.001 • 

Bog....ru. aonfervlcolu. 	Bo. 2 3 4 13 

lit. 0.002 0.004 0.001 0.011 

Coropblua ••18Ofti. 	 No. 1 3 2 7 1 I 2 I 4 7 

lit. 0.001 0.005 0.005 0.012 0.002 0.013 • 0.002 0.001 0.003 0.015 

Coropbl.. •p1n1aome 	 80. 1 3 1 

lit. 0.002 0.002 0.001 

crlngon fr.ncl.coru. 	 No. 2 1 3 1 4 

lit. 0.015 0.006 0.225 0.002 0.016 

8IVALVIA 

1fI_ bllthlc. No. U 22 2S U 45 4S 75 II 11 12 11' 

lit. 4.125 2.723 3.0U 3.120 3.114 2.'40 5.192 LIDO 3."3 4.111 '.U4 " 4.267 

Ny. .relllri. 	 BO. 1 1 4 3 4 

lit. 	 0.110 0.027 O.OU 0.1S1 0.132 

•

~ 
53 


Appendix Table--Continued. 

Statlon ce_lel 

Date My all 10 (l~1 

20 CBI cel llCAI 20 CBI cel 

If••on 'I'U1III&LLAltIA 	 Mo. 

ft. • ~LyellAE'1'A 

at.OIIe dll. t•• 	 Mo. 

ft • 

1 

0.002 

1 

0.002 

1 

0.002 

•••nth•• 1111ft!col. 	 Mo. 

ft. 

I 

0.215 

5 

0.135 

I 

0.107 

, 0.051 

Hea1podu. bor••ll. 	 Mo. 

ft. 

1 0.002 1 0.001 

' ••udopolydor. k..,u 	 Mo. 

ft. 

27 

• 0.03' 

!I 

0.006 

5!1 

0.311 

72 

O.t2!1 

72 

o.no 

Polydor. 11gnj 	 Mo. 

ft. 

4 

0.004 2 4 0.006 0.005 2 

0.00' 

1 0.004 

PY9o.pJ.o .1.9811. 	 Mo. 

ft. 

2 

• a 4 

0.004 • 

H.t.r.....tu. tll1tonJ.. 

HobaOllia tlorida 	

Mo. 

ft. 

Mo. 

ft . 

1 

0.001 

32 

0.113 

2 3 

- 0.015 

..
 51 

- 0.106 

2 

0.005 

3 

0.010 

, 0.007 

3 

0.004 

1 

0.001 

CIIUS'1'ACIIA 

H.ml.uoon ep. Mo. 

ft. 

3 0.001 • 0.003 

22 

0.007 

17 0.006 

14

O.OOt 

aoga_ru. cont.rvlcolue 80. 	

ft. 

1 

- 0.002 

Coropblua ••J.onl. Mo. 

ft. 

14 

0.033 

13 0.026 !I 

0.010 

Coropblua spJ.nlcorn. 80. 

ft. 

1 

0.002 

BIVALVIA 

".~ bdthlca Mo. 

ft. 

125 

6.410 

161 

6.775 

11!I 

6.460 

!l0 77 

1.1176 0.!l72 

104 

2.470 

Ify. .r.n.d. Mo. 

ft. 

37 

O.!lll 

n 1.710 

U 

0.7" 

1 

0.123 

1 

0.036 
, 

• 

, 

~ 

~ I 

54 

Appendix Table--Continued. 

Station 1"1IP1el Dat. Jun. l!Ill 21AI 

22 IBI leI 31AI 22 IBI leI "AI 

22 IBI leI SIAl 

22 IBI leI 

Taxon 

TVRB&LLARIA 110. 

lit. 

2 

+ 

4 0.002 + • 0.003 + 2 0.001 

IlUlll:RTVt. 110. 

lit. 

1 0.005 

POLyellA&TA 

Bteone dllatae 

_..nth.. l1an1coJa 

'yvo.pJo ele9an. 

110. 

lit. 

110. 

lit. 

110. 

lit. 

4 0.001 1 0.001 

1 0.002 

4 0.00' 

4 0.003 

145 

0."5 

, 0.002 

112 1.051 

, 0.002 

, 0.00' 

113 

0.455 

I 

0.003 

5 0.004 

0.405 " 

3 

0.004 

43 0.211 

1 0.004 

U 0.212 0.513 " 

3 

0.003 

11 

0.41' 

3 

0.002 

11 

0.351 

H~onla rlorlde 110. 

lit. 

2 0.004 U 0.031 13 0.012 

13 

0.012 + 

3 

0.003 

3 

0.001 4 0.002 + 

3 

0.00' 

CRUSTACEA Heml."""" • p. 

Babe".torl"•••t"erl. 

110 • 

lit. 

110. 

lit. 

+ 

5 

0.03' • 0.041 

150 

0.1" 11' 0.431 

131 

0.312 4!1 0.112 51 

0.141 

104 

0.314 

Boge.aru. """rervlcol". 110. 

lit. 

Bog._aru. ap. or .pp. 110. 

lyounVI lit. 

ODropbl..,. .el8onl. 110. 

lit. 

1 0.001 

34 

0.011 

1 0.002 

143 

0.333 11 

0.02' 4 0.004 2 0.003 

+ 

, 0.002 

1 0.002 

5 

0.002 

0.013 •

3 

0.002 

3 

0.002 

caa-arld•• 110. 

lit. + 

Crangon rrenclacor..,. 110. 

lit. 

1 o.on 1 0.063 

III8IIC'l'A 

Dol1chopod1d•• 

Ch1rOllaa1de. 

110. 

lit. 

110. 

lit. 

I 

0.001 

21 0.004 

, 0.00' 

3 

0.001 

11 0.021 

25 

0.003 

1 0.004 

BIVALVIA 

Ha_ balthlee 110. 

lit • 

1 0.041 1 30 

0.00' 12.241 

2. 51 42 

'.204 13.'" 12.111 

35 53 

1.345 15.52' 22 D.". 32 

2.'33 

24 

0."4 
55 


Appendix Table--Continued. 

Station Ca....1.) 

Dat. J ..... 1t11 'CAl 22 

C8) CC) 7CA) 

22 

C8) CC) ICA) 

2t 

C8) CC) 'CAl 

at 

C8) CC) 

T••on TURllliLLAltlA 80. 

lit. 

1 2 0.001 0.001 3 0.002 

DlmRftA 80. 

lit. 

1 

0.003 

POLYCIIM'l'A 

.It...... cUlata. 

"a"th.a 11JlnJcola 

80. 

ft. 

80. 

lit. 

1 ' 1 

+ 0.002 

'1 57 

0.401 0.334 

3 

0.003 

14 

0.342 

+ 

7t 

0.'31 

+ 

'2 0.310 

100 

0.143 

.. 0.342 

135 

0."0 

It 

o.41a 

1 2 0.002 + 0.004 

10 .3 

1.115 " 0.4n O.a45 

Ps.udopolydora k-.p1 80. 

lit. 

2 1 1 

- 0.003 0.001 

Pyvospjo .l..."s 80. 

lit. 

H.t.roa.stus f111for.1s 80. 

lit. 

1 

0.013 

HaNon1a florida 80. 

lit. • 0.002 

2 

+ 0.001 

9 

0.003 2 0.002 10 0.005 

, 0.004 :n O.OU 27 

0.016 U 

0.0" 

51 0.027 47 0.027 

CRUS'l'ACEA 

Eohaustorius .stuar1s 80. 

lit. 

11 

0.225 

91 

0.311 

lOt 0.305 0.011 • 20 

0.0$5 

, 0.027 

1 

0.004 

3 

0.00' 

1 

0.005 

1 

0.002 

1 

0.003 

Bogs_rus oonf.rv1colu. 80. 

lit. 

3 

0.00' 

1 

0.002 

Bog....ru. ap. or app. Cyo....V) 80. 

lit. + 2 + + + 

Coroph1u. ••1.an1. 80. 

lit. 

, 0.009 4 

0.005 

5 

0.016 

12 0.011 20 

0.045 

16 

0.023 t 0.024 

7 

O.OU 15 

0.0" 

22 

0.053 22 0.054 

20 

0.064 

Cr.ngGn fr.no1.corua 80. 

lit. 

1 0.022 2 0.236 2 0.057 

BIVALVIA 

..._ belth1cs 80. 

lit. 

27 

1.201 

20 

1.010 

11 

0.613 

21 

2.lt' 

3t 

2.004 

27 

3.113 

:17 

5.121 

14 

2.532 

23 

2.004 

27 

2.001 

35 

3.2" 

11 

1.n, 
56 


Appendix Table--Continued. 

Station la_leI 1011.1 IBI leI 1111.1 IBI leI Date June 1111 2' 29

Taxon 

TURBSt.LARIA 	 Mo. 1 

ft. 0.001 

_1tTU. 	 Mo. 1 ft. 0.003 

POl.YCIlUTA N••nth.. lianlcol. 	 Mo. 14 11 13 4 5 , ft. 0.0" 0.014 0.0'2 0.00' 0.014 0.011 

, ..udopolyrlor. ke.,u 	 Mo. 2 , 4 2' 11 22 

ft • 0.002 0.004 0.002 0.071 0.0" 

H.t.ra...tu. rJIJrora1. 	 Mo. 1 1 1 1 2 1 ft. 0.001 0.012 0.001 0.006 0.005 0.001 

HDbllonJ. rlorJd. 	 Mo. 51 III 10 21 11 111 

ft • 0.011 0.112 0.0" 0.0111 0.003 0.015 

CRUSTAC&A 

H..Jl._ ap. 	 Mo. • 3 1 

ft. 	 0.002 0.001 0.002 

eoropbJwa .el.on1. 	 Mo. 12 31 4' 1 

ft. O.OU 0.015 0.141- 0.001 

BIVAl.VIA 

...coae bIolth1c. Mo. 77 102 111 '1 13 11. ft. 5.7'5 '.032 5.2'1 0.'46 2.351 4.420 

Ifye er.n.r1. 	 Mo. 3 1 II 

ft. 0.n4 0.432 0.490 

..,
57 


Appendix Table--Continued. 

a~.~10n C,...,l.) 

Da~. July I'll 

:lCA) 

:1:1 

CB) ce) 3CA) 

U 

CB) ce) 4CA) 

U 

CB) ce) 5CA) 

U 

CB) ce) 

Taxon 

Tl/RII&LLAJUA No. 

ft. 

1 0.001 5 

0.002 + 4 o. au 11 0.001 :16 0.011 17 

0.004 5 0.001 4 

+ Ii 

0.00:1 

, o.ou + 

POLYellU'1'A 

.t.on. du.t•• No. 

ft. 

4 

0.002 

4 

0.002 

1 

0.003 

4 

0.005 

2 

0.002 

2 

0.011 

1 0.001 2 

0.002 

1 

0.002 

_..nth.. llanjcol. No. 

ft. 

U 

0.021 

, 0.026 

1 

0.002 

114 

0.10' 

213 1.134 332 2.141 

50 

0.365 

65 

0.U1 

140 1.113 O.st, " 103 

0.152 

121 

1.631 

PytJo.,uo .lag.n. 

Hobaon1. florid. 

Bo. 

ft. 

No. 

ft. 

1 1 

+ 0.001 

53 

0.057 

.. 0.011 

20 

0.003 

243 

0.230 

I 

0.004 

1 

0.002 

30 

0.016 

5 

0.001 

12 

0.001 

11 

0.001 

CRVa'1'ACV. 

Gftorl.o.pb••ro.a lut•• NO. 

ft. 

5 0.005 2 0.004 

&oh.u.torlu•••tu.rI. No. 

ft . 

5 0.046 155 0.420 232 0.134 65 0.230 

10 

0.21' 

55 

0.120 20 0.053 

• Of....ru. conf.rvlcolu. NO. 

ft. 

53 0.123 2 0.005 21 0.045 

Eog....ru. ocl.lrl 

Corop/l1_ .11_1, 

NO. 

ft. 

No. 

ft. 

1 0.003 12 

0.021 11 0.034 

1 1.003 

53 0.065 4 0.004 5 0.002 

, 0.004 1 0.002 1 0.004 

Coropbl_ .,unicorn. No. 

ft. 

26 

0.061 1 0.001 2 0.002 2 0.001 

INallC'1'A 

Dollahopodid•• Bo. 

ft. 

26 0.093 

11 

0.0'1 

20 0.061 5 0.005 1 

0.002 1 0.004 

ehironoaide. No. 

ft. 

443 

0.1'1 

531 

0.125 I" 0.301 + 

BIVALVIA 

........ baltMe. No. 

ft. 

2 0.043 22 

'.052 

30 44 t, 6.519 16.251 19.202 26 lit 1.U2 11.404 22 2.120 21 4.501 17 

6.151 
58 


Appendix Table--Continued. 

Stat10n (8a.ple) 6(10) (8) (C) 7(10) (8) (C) 1(10) (8) (C) '(A) (8) (e) 

Date July ltll 22 22 27 27 

Taxon 

TlIIIB&LLARIA 	 No. 2 4 1 4 3 lit. • . 0.002 0.002 0.001 • • 0.002 0.001 

IIDIERTEA 	 No. 1 lit. 0.026 

POLYCIIAETA 

Et.on. cUl.t•• No. 1 2 2 1 lit. 0.001 0.002 • 0.001 0.002 

•••nth•• l.1l1111aol. 	 No. 64 53 11' 7' 132 150 14 5' 51 72 57 52 lit. 0.317 0.U4 1.563 O.It, 1.221 1.306 0.726 0.513 0.554 0.453 0.412 0.27' 

P••udopolydor. k.~ No. 1 2 1 3 lit. 0.003 0.004 0.003 0.014 

H.t.roaa.tu. fl11forai. 	 No. 1 1 lit. 0.010 0.024 

Hob.onl. florJd. 	 No. 7 7 10 23 Z2 26 44 57 '4 257 315 255 

lit. 0.005 0.010 0.040 0.021 O.OU 0.045 0.056 0.103 0.267 0.307 0.322 • CRUSTACEA 

GnorJlIO.ph••r.... lut•• No. 2 lit. • 

Eoh.u.toriu•••tv.rI. 	 No. 71 14 3. 25 15 10 1 1 2 lit. 0.144 0.25' 0.016 0.0'2 0.037 0.022 0.007 0.007 0.002 

Bog....ru. ocl.lri 	 .0. 

lit. 

Bog....ru. aonf.rvlaolu. 	No. 2 5 26 1 3 

lit. 0.00' 0.016 0.054 0.001 0.005 

Corophlua ••laonl. 	 .0. 2 2 5 4 5 It , 34 13 11 21 lit. • 0.004 0.012 0.007 0.010 0.052 0.001 o.on 0.03& 0.037 o.on 

Corophlua .p1nIaorn. 	 No. 3 1 13 2 , lit. 0.003 0.001 0.00' 0.001 0.013 

Crangon franclaaorua 	 No. 1 2 1 1 lit. 0.07. 0.12' 0.012 0.11' 

BIVALVIA 

......... balthlc. 	 No. 24 14 20 24 23 21 26 21 30 53 52 5' lit. 4.&3t 4 • .,0 3.004 1.1lt 3.71' 4.703 1.,.. 3.lt4 3.311 5.nO 5.106 4.303 

Ify. .r.n.rJ. 	 No. 3 

lit. 0.029 

•

.,

..,
59 


Appendix Table--Continued. 

ft.t~on (a_l., Date July I'll 

" ••on 'l'VIIBBLJ.ARIA 


POLYCJLU:'fA 


Bt.on. dllata. 


".utlla. l~lcola 

'}Vo.pI0 .l.gan. 


s.t.ro.a.tu. ~ll1~~. 

HabeDnla ~lorida 

CRUa'fACQ


IfaJI1leuc:on • p. 


Bohauatorlua ••tuari. 


Coropblua .al.ani. 

Corophlua .p1n1corne 

BIVALVIA 

..._ hIIlthloa 

Mya arenaria 

.0. 

ft. 

.0. 

ft. 

Xo. 

ft. 

.0. 

ft. 

Xo. 

ft. 

.0. 

ft. 

Xo • ft. 

Xo. 

ft. 

Xo. 

ft. 

Xo. 

ft. 

.0. 

ft. 

Xo. 

ft. 

10ilU 


27 


2 
 0.006 

I' 

0.101 

+ 

111 


0.110 

2 


0.002 

I 


0.004 

7.456 " 

1 
 0.002 

(B, 

+ 

1 
 0.001 

3 


0.001 

2 


212 
 0.154 

+ 

4 


0.001 

22 


0.054 

1 
 0.002 

10 
 5.406 

4 
 0.070 

(C, 

4 
 0.001 

I 


0.005 

245 
 0.213 

2 
 0.005 

I 


0.030 

2 
 0.002 

10 
 5.UI 


10 
 0.U5 


ll(A' (B, (C, 

27 


1 2 1 


0.002 0.011 0.001 

7 15 3 
 0.004 0.011 0.003 

4 13 3 
 0.001 0.004 0.001 

" 
 13 71 
 4.114 6.010 6.341 
60 


Appendix Table--Continued. 

Station lIampl.) 

Date Auquot 1911 1IA) 21 

IB) Ie) 21A) 

21 

IB) Ie) ]IA) IB) 

21 

Ie) 41A) 

21 


IB) Ie) 


Taxon 

'l'URBELLAIUA 	 No. 

ft. 

] 

O. 001 13 21 0.001 0.012 

]2 

0.015 3 

0.002 

1 


0.003 


IIKNItItTKA 	 No. 

ft. 

1 
 0.021 


POLyeHAETA 


Be.on. dllaeu Jlo. 

ft. 

5 5 

0.005 0.001 

5 

0.005 

4 

0.005 

] 


0.004 


•••ntb•• l111111cola 	 No. 

ft. 

1 0.021 11 

0.005 

2 

0.011 

13 104 

0.121 0.620 

11 

0.115 

14 

0.523 3' 0.]]1 54 
 0.347 


PYfJOSpjo .legan. 	 Jlo. 

Nt. 

] 2] 

+ 0.004 

20 


0.00] + 


HoUon1a flodda 	 No. 

Nt. 

351 

LUI 

347 

0.115 

]15 

0.145 

II 

0.121 

14 

O.Oll 

14 


0.016 


eRVSTAC&A 

Bobau.todu• ••tu.d. 	 No. 

ft. 

] 

0.021 

I 62 

0.266 

,. 0.311 

121 


0.431 


Bog....ru. ocl.1r1 	 No. 

ft. 

1 


0.015 


B09.~ru. conferv1colu. 	No. 

ft. 

] 

0.004 

11 

0.061 

2 

0.002 1 
 0.00] 


Coroph1". .al.onl. 	 Jlo. 

ft. 

lS] 

0.465 

115 

0.321 

I] 

0.2ll 

4 

0.007 

4 

0.004 

!I 


0.016 


eorophlW1 .plnlcorne 	 No. 

Nt. 

1 

0.002 

6 


0.004 


INSECTA 


Dol1chopocl1c1•• Jlo. 

ft. 

4 

0.006 

30 47 

0.090 

44 

0.010 

2 


0.00] 


Ch1ronoa1c1•• 	 No. 

ft. 

6 5 0.002 1122 

0.40] 

49] 

0.195 

110 0.32] + 2 


+ 


GASTROPODA 

.aC0910••• 	 110. 

ft. 

2 

0.001 

] 

0.001 

1 

0.002 

1 
 0.00] 


BIVALVIA 


......-. bsltb1c. Jlo. 

ft. 

24 16.31. 

36 

13.120 

21 

10.116 

36 6.104 31 14.0!ll 

21 


9.612 


, 

~ 
61 


Appendix Table--Continued. 

atat10n 1...1el 

Oat. Auquat Ull SIAl 21 IBI leI "AI 21 

IB) Ie) 7(10) 

21 IBI leI 1(10) 

25 

IB) leI 

"axon 

'l'Vllll&LUlltIA 110. 

ft. 

5~ 

0.014 5' 0.011 22 0.006 3 0.001 2 0.002 1 0.001 

POLYCIIM'I"A 

Bteane cUlatae 110. 

ft. 

1 

0.001 • 1 0.001 

2 

0.002 

1 

0.002 

••anth.a l1an1cola 110. 

ft. 

34 

0.420 

101 

1.241 53 0.'05 '5 2.015 

24 0.447 31 

0.652 

51 

1.0:" 

I~ 

1.:152 

66 

0.'61 

40 

0.305 

32 

0.410 

43 

0.217 

P790ap10 .legana 110. 

lit . • 

Het.ra.aatua f1l1ro~. 110. 

lit. 

1 

0.001 

1 

0.002 

1 

0.003 

2 

0.005 

1 

0.003 

H~on1a flor1da 110. 

lit. 

7 

0.001 

163 

0.561 

3 

0.0" 

15 

0.025 

, 0.015 

4 

0.005 

, 0.007 

22 0.042 

16 

0.014 

50 

0.0'3 

61 0.107 2t 0.023 

CRV&'I"ACU 

Gftor1aoapba.ra.a lut.a 110. 

ft. • 1 0.002 

Bohauator1ua .atvar1a 110. 

lit. 

52 

0.124 

30 

0.03' 

73 

0.111 

14 0.033 144 0.312 

121 

0.341 11 0.011 11 0.063 12 0.034 I 0.027 16 

0.040 13 0.035 

BD9a_rua oc:ldr1 110. 

lit. 

1 

0.005 

BD9a_rua conf.rv1colua 110. 

lit . 

16 

0.024 

3 

0.013 

, 

Coropbju. .al8On1a 110. 

lit. 

4 0.003 43 

0.064 7 

0.002 2 0.006 

.. 0.007 2 0.005 10 0.011 I 

0.00' 2 0.004 11 0.024 11 0.024 13 0.013 

Coropbjwa .p1n1c:orn. 

BIVALVIA 

...coea haltb1... 

110. 

lit. 

110. 

lit. 

35 

0.050 

11 2t 4.2U 14.205 

22 

4.UO 

3 

0.004 

21 

7.412 

20 

2.154 

22 4.133 21 

4.541 

5 

O.OOl 

25 

5.154 

23 

4.221 

21 

4.'00 

1 

0.002 

2' 5.525 

11 

4.120 
62 

Appendix Table--Continued. 

atat10n Ca_le) Date Au9Uat 1111 IIA) 

26 (8) ce) 10CA) 25 

(8) ce) llCA) 26 (8) ce) 

Taxon 

TURBELLARlA 	 110. 

lit. 

2 3 0.002 • IIBIIKRftA 	 110. 

lit. 

1 0.006 1 0.004 2 

POLyeHAZTA 

BteOll. dilata. 110. 

lit. 

2 0.002 2 0.002 2 0.001 1 0.001 2 0.001 

".allth.. 11...1cola 	 110. 

lit • '2 1.15' 

54 1.016 51 

0.'51 

50 0.511 4' 0.651 21 

O.UO 

10 

0.04' 1 0.003 

Peaudopolydora ta.pl 	 110. 

lit. 

3 0.010 3 0.014 3 0.011 14 0.00' 20 0.015 17 0.015 

Pygoap10 alegalla 	 110. 

lit. • 2 

• Hataro.aatua fll1fond.a 	 110. 

lit. 

1 0.035 1 0.005 1 0.017 3 0.074 3 0.011 2 0.021 

Hobsonla florlda 	 110. 

lit. 

55 0.073 5' 0.075 31 0.040 162 0.271 210 0.511 200 0.355 7 0.001 

, 0.00' 

eRIIBTAeRA 

lIa81laucon ap. 110. 

lit. 

2 

• Eohauetorlua aetuarla 	 110. 

lit . 

1 0.004 

5 

0.010 1 0.006 

Eoga_rue conf.rv1colue 	110. 

lit. 

1 0.315 3 0.004 

Corop/l1U1O aa.t.on1e 	 110. 

lit. 

2 1 0.002 5 1 0.002 1 0.002 

CorophlU1O ap1111cor.n. 	 110. 

lit. 

7 0.004 4 0.004 I 

0.004 4 0.002 

CrangOll frallc1acorUlO 	 110. 

lit. 

1 

0.3115 

BIVALVIA 


Ifa_ balthlca 110. 

lit. 

21 7.223 25 7.111 11 3.125 60 7.112 .. 11.246 129 1.03' " 10.557 61 111 7.417 15.612 

Ifya arallada 	 110. 

lit • 

• 

$ 

.., 
63 


AppencU.x Tab~e--Continued. 

ft.tlon (..~l.) 

Dat. lept_~ 11111 2(A) 15 

(al (e) 3(A) 

15 

(a) (e) 4(AI 

15 

(a) (el 5(A) 

15 

(al (e) 

Taxon 

TUlUl&LLAIIIA ao. 

lit. 

2 0.002 

, I 

0.005 U 0.020 U 

0.014 

5 

0.001 2 0.001 

15 

0.004 4 + 0.002 2 0.001 

_DA ao. 

lit. 1 0.010 

I'OLYellAll'l'A 

.It.on. dil.t•• ao. 

lit. 

7 0.001 111 O.OU 

5 

• 1 0.001 • ...lIt1l.. lllln1col. ao. 

lit. 

4 0.030 115 

2.015 21 0.213 0.704 " 123 

0.'" 

51 

0.417 57 0.290 

51 

0.327 32 0.505 U 0.'11 21 0.'21 

' ..udopolydor. t.-pI 

'yvo.pjo .1.g.lI. ao. 

ft. 

ao. 

ft. • s

• 

1 0.001 

H0b8onl. florId. a.. 

ft. 

3 o.oos 13' 14 0.001 172 0.273 

471 31 

- o.on 114 

0.35' 0.157 " 11 0.013 

13 7 

- 0.005 

CIIUI'I'ACU 

Gnor180.pb••ra.. lut.. aD. 

ft. 1 0.001 

Boh.uatorJua ••tu.r1. ao. 

ft . 3 

0.031 '4 0.2" 

74 

0.343 7!1 0.223 121 0.379 

53 O.UI " 

.Iog....ru. oclairi ao. 

ft . 1 0.005 

.Iog....ru. conf.rvicolu. ao. 

ft. + 

111 5 

Coropb1ua ••l8Gn1. ao. 

ft. 

2 0.004 3 

0.002 0.001 • 131 

0.213 

382 

0.110 

9 

0.002 4 0.004 l'

0.022 4 0.00' 

37 

0.071 

3 

0.004 

Coroplliua .pjll1corn. ao. 

ft. 1 0.002 0.001 • 2 0.002 12 

Ial&C'I'A 

Dollahopocl1.... a.. 

ft. 

54 

0.251 

3 

0.007 

10 

0.040 22 0.0&5 2 0.005 

Chl~_oa1"'. aD. 

lit. 

III 

0.57' 

.4 

0.037 

1151 

1.07. I 

0.003 2

• &phytl~lt1••? 

au_ 

·.00910••• 

ao. 

ft. 

ao. 

ft. 

73 

0.201 

12 0.051 

170 

0.1" 

1 0.010 22 0.050 3 

0.004 

aIVALVIA 

Ifa_ 1M1tll1oa ao. 

ft. 

5 

1.351 21 3. 7.017 17.'11 

25 27 45 33 

'.952 10.311 14.012 11.'21 11 3' 

4.012 12.353 U 

4.51' 
64 


Appendix Table--Continued. 

na1;J.OIl 1__101 &lAI IBI ICI llAI 181 ICI IIAI IBI ICI IIAI IBI ICI Dat. .ep1;_r I'll 15 15 25 25 

Taxon 

TUlIBEI.I.AIUA 	 110. 2 2 3 2 2 2 2 ft. + + 0.001 0.001 0.001 0.001 

JlKllZRTBA 	 110. 1 1 1 ft. 0.004 0.002 0.004 

POI.YCIIAETA 

Bteone dil. t.e 110. 1 1 1 2 3 2 ft. 0.001 0.001 0.001 0.001 0.002 0.001 

Nea"tbo. ll...lcola 	 110. 64 61 101 11 57 36 42 16 11 53 25 65 ft. 1.1'4 0.400 0.314 0.665 0.431 0.130 0.'32 0.719 0."0 0."5 0.110 0.774 

'nudopolydora k..,u 	 110. 5 6 1 1 2 

ft. - 0.003 - 0.001 0.002 

Hetera.a.tu. flllfor.1. 	 110. 1 1 1 1 

ft. 0.015 0.030 0.03' 0.023 

Hoboonla florlda 	 110. 5 4 10 3 40 46 66 ft. - 0.016 0.011 0.012 - 0.113" 0.091 0.100 0.165 0.20' " 0.141 

., 

CIIUSTAC&A 

GJlodao.p/laera.a lutea 	 liD. 1 

ft. 0.001 

Bohau.todua , ..tuad. 	 liD. 106 113 154 7 21 15 12 10 1 1 

ft. - 0.312 0.461 0.02' - 0.066 0.052 0.044 0.032 0.002 0.003 

Bog....ru. oclalr1 	 110. 1 2 

ft. 0.004 0.007 

Bog....ru. confervlcolu. 110. 2 2 3 3 3 

ft. 0.005 0.001 0.011 0.007 0.005 

Corop/l1u. ••laonl. 	 110. 5 , , 11 , 14 15 6 1 

ft. 0.014 - 0.023 - 0.010 0.020 0.027 - 0.014 - 0.003 

Corop/l1u. ap1,,1come 	 110. 10 3 3 12 

ft. + 0.011 0.005 0.003 0.00& 

BIVALVIA 

1fI_ baltlJ1ca liD. 17 21 22 22 I 16 24 11 20 21 15 

ft. 3.315 3.635 5.300 5.021 7.245 1.124 3.6'1 7.026 3.521 6.240 1.151 3.767 l' 

I 

1 ~! 
65 


Appendix Table--Continued• 

lOCAl 

25 

2 

0.002 

23 

0.311 

3 

0.005 

•

2 

1 0.001 

111 

O.Ul 

1 

0.025 

3 

0.004 

., 13.M3 

3 

5.020 

cal 

1 

0.00' 

11 

0.1" 

, 0.00' 

3 

+ 

1 

0.002 

241 

0.141 

• 0.00' 

as 0.042 

118 

13.102 

eC:1 11 CAl cal CC:I 

25 

2 

0.005 

+ 

1 2 2 1 

0.265 0.024 0.012 0.011 

1 11 51 

0.001 0.155 0.101 0.041" 

, 1 4 2 

0.041 0.01' 0.042 0.011 

51 4 4 

0.152 0.001 0.002 + 

3 

0.004 

2 

0.001 

5 0.011 

2 

0.002 

23 0.017 

2 

0."7 

37 nl 148 152 5.115 18.345 11.872 20.'" 

• taU.Oft c._l., 

Dat. aept_~ 1111 

T.....n 

TVRULLAIlIA 

_TEA 

POLYC:IlAlliTA 


Bt_. dU.t•• 


"e.nth•• Jj..,jGO.l. 


P.eudOpoJydor. t~ 

pygo.pjo eJ.,.o. 


Hetero.a.tu. f1l1fo~. 

HoI»on1. rlodd. 

aV,TAc:L\

ad.nu••p. 

~_a 

Bog._ru. ocldd 

Bog._ru. canrerv1GO.1u. ao. 

ft. 

Coropll1,. .d8Oll1. ao. 

ft. 

COrop/l1,. .p1n1come .0. 

ft. 

_~1c1a. ao. 

ft. 

Crogan rr.no1.coru. .0. 

ft. 

alVAloVlA 

....... boIltlllca ao. 

ft. 

~. .ren.r1. ao. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

.0. 

ft. 

ao. 

ft. 

ao. 

ft. 

ao. 

ft. 

ao. 

ft. 

ao. 

ft. 
66 


Appendix Table--Continued• 

• t.tlon C...pl., 2CAI CBI CCI 3CAI CBI CCI 4CAI CBI CCI 5 CAl CBI CCI 
 Dat. 00t01oe" 1111 21 21 21 21 


'f••Oft 

~LLARIA Ko. 12 5 47 41 4 2!1 5 11 3 n 10 13 
 ft. - 0.001 0.027 0.002 0.017 0.002 0.004 0.001 0.010 0.003 0.003 


_DA 	 Ko. 2 


ft. 0.037 


POLYCHUTA 


Bteon. dJl.t•• Ko. 24 I 11 1 2 
 lit. 0.10' 0.020 0.051 0.002 


W••nth.. l1.n1col. 	 Ko. 1 4 121 .0 155 57 71 53 41 7. 42 
 lit. 0.015 0.211 1.••3 0.155 1.173 0.502 0.475 0.410 0.551 1.011 0.525 


' ••udopolydor. t..,u 	 Ko. 2 1 


lit. 0.004 	 + 0.001 

'YfJO.p1o .l...n. 	 Ko. 

lit. 0.001 	 • + 

H.t.ra.a.tu. r1l1rora1. 	 Ko. 1 1 


ft. 0.004 0.002 


Hobaon1. rlor1d. 	 Ko. '225 10 140 21 31 51 11 151 20 


lit. 0.516 0.142 0.270 0.057 0.010 0.175 0.026 0.125 o.on 


CIIU.TACKA 


Gnor1••pb••r_ lut•• Ko. 1 
 lit. 0.001 


Boh.u.tor1u. ..tu.r1. 	 Ko. 3 1 135 20 53 17 41 
 .. lit. 	 0.011 0.004 0.513 0.01& - 0.334 - 0.222 

.......ru. ocJdd 	 Ko. 4 1 


ft. 0.005 0.002 


Bov....ru. conr.rv1colu. 	Ko. 3 4 13 


ft. - 0.004 - 0.035 


.......ru. ap. 0" app. 	 Ko. 


Cy......." 	 ft. 
 •

Coropb1_ .aJlIOft1. 	 Ko. n 111 317 15 32 55 4 51 10 


lit. 0.145 0.112 0.422 0.011 - 0.012 0.002 0.121 0.005 


Coropb1_ .p1n1corne 	 BO. 21 2 11 2 22 3 


lit. + 0.050 0.002 0.021 0.001 0.015 0.001 


IK.ZCTA 


Dol101aopodl.... Ko. 22 2' 27 2 
 ft. - 0.041 0.070 0.004 


Ch1"onOll1.... 	 Ko. 1515 3411 1454 11 1 


lit. 1.355 1.452 1.200 0.007 0.001 


ZpbyCd.... 	 Bo. 12 15 


ft. 0.130 


GAII_ 

••_loa.. 	 Ko. .0 55 100 2 


lit. - 0.151 - 0.004


BIVALVIA 


Ifa_ balth1ca KO. 22 22 31 11, 41 31 15 51 17 


ft. 	 1.515 ....5 21.157 5.733 14.UI 15.552 5.051 17.025 4.1" 

•

~ 

~ 

~ 

At 

1 
67 


Appendix Table--Continued. 

't.a~~on Ca.."l., 6CAI C81 cel 1CAI (8) cel ICAI CBI cel teAl C81 cel Dah OOtClber 1111 21 21 U 25 

T••on TllllB&LU\aIA 80. 2 6 3 1 2 1 11 I 11 15 13 13 

ft. 0.001 0.003 0.002 + 0.002 0.001 0.004 0.003 0.003 0.001 0.001 0.001 _'BA 80. 1 2 1 1 ft. 0.024 0.031 0.005 0.056 

POLyellUTA 

Bt..",. d11ata. 80. 1 4 1 2 2 2 2 

ft. + 0.003 0.002 0.002 0.003 0.001 0.002 

..."th•• 11...1oola 80. II 40 3D 58 12 U 32 4' 40 H 10 Sl ft. 0.U1 1.035 3.0S' lon, O.S" '0.1" 0.U3 0.2S1 0.255 2.240 0.115 1.231 

, Pa.udopolydora tellp.1 80. 2 1 I 5 4 1

ft. + 0.002 O.OOS + 0.019 0.001 0.022 - 0.014 

Polydora 119111 80. 1 1 5 

ft. + 0.002 0.001 

Pyvo.p1o el.gan. 80. 1 

ft. 0.001 

..t.roaa.tu. E111Eor81. 80. 1 ft. 0.001 + 

Hobaon1a Elor1da 80. S 21 11 45 120 N 113 311 US 152 121 150 ft. 0.010 0.055 O.Oot 0.052 0.113 0.11' 0.lS0 0.424 0.314 0.211 0.211 0.U4 

CIIV.TAC&A 

H...Ueuoon ap. Bo. 3 

ft. 0.001 + 

Bahau.tor1ua .atu.ria 80. 121 '5 105 22 10 22 13 31 20 1 1 ft. 0.410 0.242 0.311 0.0.1 0.021 0.074 0.017 O.UI 0.0'11 0.002 0.004 

Bog....ru. conEerv1oolu. Bo. 1 21 3 15 5 2 ft. 0.002 0.012 0.001 0.010 0.015 0.010 

Coropb1ua aal.an1a 80. , 2 11 5 2. 12 20 23 4 2 ft. 0.001 0.015 0.001 0.001 0.031 0.024 0.021 0.041 0.004 0.005 

Coropb1". ap1n1oorne Bo. 32 10 1 3 S 3 1 ft. + 0.011 0.003 0.001 0.001 + 0.005 0.002 0.001 

IB.SCTA 

Ch1rcmoa1cla. Bo. 1 ft. 0.002 

BIVALVIA 

Ifa_ JNlth1ca 80. 12 24 11 21 21 22 40 32 U 32 11 ft. 3.SI3 1."2 3.215 4.217 '.S01 4.U4 12.737 '.005 s.ns 5.S3I 2."2 5.100 " 

lIya arenar1a 80. 1 ft. 0.004 
i 

~ 

~ 

~ 

..,

..,

~ 

., 

68 

Appendix Table--Continued. 

S~.t1on C••••, lOCAl CBI CCI 11 CAl CBI CCI 

Date OCtober 1911 26 25 

Taxon 

Tl/IUII:LLAIUA 	 Bo. 1 1 12 lit. 0.00l 0.001 0.004 

IIDIERTEA 	 Bo. 1 2 

lit• 0.005 0.005 

.aLYCHAI!TA 

Bteone dU.t.. Bo. 1 

lit. 0.001 

M••nthe. l~lcol. Bo. 21 25 2a 1 1 2 B~. 0.51' 1.402 0.'31 0.001 0.014 o.on 

'.eudopolydoz. Jrnpi 	 Bo. 23 11 27 7 I 11 

lit • 0.0" 0.033 o.on 0.00' 0.011 0.033 

'olydor. l1,nl 	 Bo. 2 7 7 1 1 lit. 0.001 o.on 0.001 0.001 0.003 

'yvo.p1o elev.n. 	 Bo. 3 2 n lit. 0.001 • 0.004 

• 	 Heter_.tu. lill/onU. 	 Bo. 1 2 2 $ 7 

II~. 0.037 0.100 0.110 0.022 0.032 0.146 

HobsonJ.. t 1 ori.d. 	 110. ua U4 22' 3 , lit. 0.397 0.471 o.no 0.003 0.00' 

CltUSTACEA 

Hell11eucon .p. 	 No. 2 3 

lit. • 	 0.001 

Eo'....ru. ocl.J.rJ. 	 Bo. 2 

lit • O.OOll 

, Eo'....ru. contervlcolu. 	Bo. 1 

111:. 0.001 

Coropblu. ••l.onl. 	 B•• 2 1 

II~. 0.001 0.001 

Cozopbiu. .p1nlcorne 	 Bo. 2a ZI 

lit. 0.019 0.014 

alVAJ.VIA 

"._ baltMc. 	 Bo. It n '7 II~. 12.069 12.U5 11.361" '.130" 12.163 " '.2" 

My. aranada 	 Bo. 2 1 1 

lit• 	 D.OO! 0.004 0.002 

• "19"~ < 0.001 9. 
 - Indlc.~•• vol~~ no~ ~.k.n.