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ARS Home Pacific West Area Albany, California Western Regional Research Center Invasive Species and Pollinator Health People





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- Paul Pratt, RL
- Brenda Grewell
- Brian Hogg
- John Madsen
- Patrick Moran

Brenda  Grewell    Research Ecologist /ARSUserFiles/36771/Brenda Pics 2.jpg
 Contact: (530) 752-0166 Brenda.grewell@ars.usda.gov Area of Expertise: Research Ecologist
 Education: Ph.D., University of California Davis, 2004
 **Work Experience:** Research Ecologist, USDA/ARS, Invasive Species and Pollinator Health Research Unit, Davis, CA, 2004 to present Fulbright Scholar in Botany, Faculty of Biological Sciences, Dept. of Ecology & Hydrobiology, University of South Bohemia, Czech Republic, 2003. Post-graduate Researcher, University of California, Davis and Bodega Marine Laboratory. Sacramento – San Joaquin Delta – San Francisco Estuary Ecosystem Restoration Program, tidal wetland ecology and endangered plant recovery, 1998-2002. Sr. Environmental Scientist (Wetland Ecologist/Aquatic Botanist), California Department of Water Resources, Environmental Services Office, Suisun Marsh Program, 1989-1998.   **Research Focus:** Our research team investigates aspects of plant biology and ecology, and the ecology of biological invasions that contribute to the development of ecologically-based and environmentally benign management strategies for invasive aquatic, wetland and riparian plants in the Pacific West that will reduce undesired impacts on non-target organisms and the environment. Overarching objectives of this research are to conduct research to understand the biogeography of invasive plant species and the ecology of invaded systems at relevant spatial scales to solve critically important invasive weed problems. We aim to support recovery of impacted native species, plant communities and watersheds, and to develop ecologically-based strategies for invasive plant management that are integrated with strategies for ecological restoration.  Current research includes focus on the following:  Conduct biosystematics studies including morphological, cytological and genetic differentiations to provide accurate identification of confusing and highly invasive *Ludwigia* taxa to support development of integrated management including biological control for these highly variable-looking plant species. Studies are underway in Pacific Coast states and Florida.
Assess physiological and morphological traits that influence the survival, colonization, growth and competitive ability of invasive plant species under changing environmental conditions to inform invasive species risk assessments and predict feedbacks on community dynamics and ecosystem processes. For example, we are assessing how ploidy level and resource availability affect regeneration and colonization strategies of invasive water primroses, including germination and seed bank dynamics and regeneration from clonal bud banks.
Identify factors determining impacts of invasive plant species on desirable plant communities and ecosystems, and illuminate factors contributing to context-specificity of invasions and their impacts.
Evaluate the role of phenotypic plasticity, ploidy level and genetic differentiation on the capacity of invasive aquatic plants/populations to maintain fitness in response to environmental changes. For example, we are studying the effects on increasing salinity and inundation regimes with sea level rise on invasive cordgrasses and their hybrids, and on yellow flag iris in estuarine ecosystems of the Sacramento – San Joaquin Delta and San Francisco Estuary.
Evaluate the influence of hydrology and water management on dispersal, propagule pressure and establishment of invasive *Ludwigia hexapetala* in the Russian River Watershed, and identify river reach-scale strategies for restoring native plant communities.  ***Info about my research team:** **Current lab members**: Caryn Joy Futrell, M.S.; Jessica Drost, B.S. **2017 Lab Alumni:** Dr. Meghan Skaer Thomason; Christopher McCort, M.S.; Ann Le, B.S.; Denise Castro, undergraduate associate; Mayra Huerta, undergraduate student associate. **Principal collaborators:** Dr. Rebecca E. Drenovsky, John Carrol University, Dr. Michael Netherland, US Army Corps Aquatic Plant Control Research Program/University of Florida; Dr. John Gaskin, USDA-ARS Sidney, MT; Dr. Gabrielle Thiébaut, Dr. Morgane Gillard, University of Rennes 1, Rennes, France; Dr. Jesús Castillo, Blanca Gallego-Tevar, Ph.D. Candidate, University of Seville, Spain; Dr. Christine Whitcraft, California State University-Long Beach; Dr. Peter Hoch, Missouri Botanical Garden Research Herbarium.
 
 Publications(Clicking on the reprint iconReprint Icon  will take you to the publication reprint.)Genetic and phenotypic differentiation in functional traits of Iris pseudacorus L. in native and introduced Mediterranean climate ranges-(Peer Reviewed Journal) Gallego-Trevar, B., Grewell, B.J., Gaskin, J.F., Castillo, J.M. 2024. Genetic and phenotypic differentiation in functional traits of Iris pseudacorus L. in native and introduced Mediterranean climate ranges. Biological Invasions. https://doi.org/10.1007/s10530-024-03350-1.Insights to the host range of the flea beetle Disonycha argentinensis Jacoby, 1992 (Coleoptera: Chrysomelidae), a candidate biological control agent of alligator weed in the U.S.A.-(Peer Reviewed Journal)Agricultural Research Service weed science research: past, present, and future-(Review Article) Young, S.L., Anderson, J.V., Baerson, S.R., Bajsa Hirschel, J.N., Blumenthal, D.M., Boyd, C.S., Boyette, C.D., Brennan, E.B., Cantrell, C.L., Chao, W.S., Chee Sanford, J.C., Clements, D.D., Dray Jr, F.A., Duke, S.O., Porter, K.M., Fletcher, R.S., Fulcher, M.R., Gaskin, J., Grewell, B.J., Hamerlynck, E.P., Hoagland, R.E., Horvath, D.P., Law, E.P., Madsen, J., Martin, D.E., Mattox, C.M., Mirsky, S.B., Molin, W.T., Moran, P.J., Mueller, R.C., Nandula, V.K., Newingham, B.A., Pan, Z., Porensky, L.M., Pratt, P.D., Price, A.J., Rector, B.G., Reddy, K.N., Sheley, R.L., Smith, L., Smith, M., Snyder, K.A., Tancos, M.A., West, N.M., Wheeler, G.S., Williams, M., Wolf, J.E., Wonkka, C.L., Wright, A.A., Xi, J., Ziska, L.H. 2023. Agricultural Research Service weed science research: past, present, and future. Weed Science. 71(4):312-327. https://doi.org/10.1017/wsc.2023.31.Wrack burial limits germination and establishment of yellow flag iris (Iris pseudacorus L.)-(Peer Reviewed Journal) Castillo, J.M., Gallego-Tevar, B., Grewell, B.J. 2023. Wrack burial limits germination and establishment of yellow flag iris (Iris pseudacorus L.). Plants. 12(7). Article 1510. https://doi.org/10.3390/plants12071510.Phenotypic trait differences between Iris pseudacorus in native and introduced ranges support greater capacity of invasive populations to withstand sea level rise-(Peer Reviewed Journal) Grewell, B.J., Gallego-Tevar, B., Barcenas-Moreno, G., Whitcraft, C.R., Thorne, K.M., Buffington, K.J., Castillo, J.M. 2023. Phenotypic trait differences between Iris pseudacorus in native and introduced ranges support greater capacity of invasive populations to withstand sea level rise. Diversity and Distributions. 29(7):834-848. https://doi.org/10.1111/ddi.13694.Seed viability, spikelet dispersal, seed banks and seed storage requirements for native and invasive cordgrasses (genus Spartina) in Southwest Iberian Peninsula-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Romero-Martin, R., Castillo, J.M., Grewell, B.J., Soriano, J.J., Nieva, F.J., Munoz-Rodriguez, A.F. 2023. Seed viability, spikelet dispersal, seed banks and seed storage requirements for native and invasive cordgrasses (genus Spartina) in Southwest Iberian Peninsula. Wetlands. 43. Article 8. https://doi.org/10.1007/s13157-022-01655-2.Climate and pest interactions pose a cross-landscape management challenge to soil and water conservation-(Review Article) Young, S.L., Campbell, J.W., Fulcher, M.R., Grewell, B.J. 2023. Climate and pest interactions pose a cross-landscape management challenge to soil and water conservation. Journal of Soil and Water Conservation. 78(2):39A-44A. https://doi.org/10.2489/jswc.2023.1025A.Germination niche breadth of invasive Iris pseudacorus (L.) suggests continued recruitment from seeds with global warming-(Peer Reviewed Journal) Gillard, M.B., Castillo, J.M., Mesgaran, M.B., Futrell, C.J., Grewell, B.J. 2022. Germination niche breadth of invasive Iris pseudacorus (L.) suggests continued recruitment from seeds with global warming. American Journal of Botany. 109(7):1108-1119. https://doi.org/10.1002/ajb2.16026.Contrasted impacts of yellow flag iris (Iris pseudacorus) on plant diversity in tidal wetlands within its native and invaded distribution ranges-(Peer Reviewed Journal) Gallego-Tevar, B., Grewell, B.J., Whitcraft, C.R., Futrell, C.J., Barcenas-Moreno, G., Castillo, J.M. 2022. Contrasted impacts of yellow flag iris (Iris pseudacorus) on plant diversity in tidal wetlands within its native and invaded distribution ranges. Diversity. 14(5). Article 326. https://doi.org/10.3390/d14050326.Biology of immature stages and host range characteristics of Sudauleutes bosqi (Coleoptera: Curculionidae), a candidate biological control agent of exotic Ludwigia spp. in the USA-(Peer Reviewed Journal) DaSilva, A., Reddy, A.M., Pratt, P.D., Hansel Friedman, M.S., Grewell, B.J., Harms, N.E., Cibils-Stewart, X., Cabrera Walsh, G., Faltlhauser, A., Chamorro, M.L. 2022. Biology of immature stages and host range characteristics of Sudauleutes bosqi (Coleoptera: Curculionidae), a candidate biological control agent of exotic Ludwigia spp. in the USA. Florida Entomologist. 105(3):243-249. https://doi.org/10.1653/024.105.0310.Biological and host range characteristics of Lysathia flavipes (Coleoptera: Chrysomelidae), a candidate biological control agent of invasive Ludwigia spp. (Onagraceae) in the USA-(Peer Reviewed Journal) Reddy, A.M., Pratt, P.D., Grewell, B.J., Harms, N.E., Cibils-Stewart, X., Cabrera Walsh, G., Faltlhauser, A. 2021. Biological and host range characteristics of Lysathia flavipes (Coleoptera: Chrysomelidae), a candidate biological control agent of invasive Ludwigia spp. (Onagraceae) in the USA. Insects. 12(5):471. https://doi.org/10.3390/insects12050471.Diversity and origins of Butomus umbellatus (flowering rush) invasion in North America-(Peer Reviewed Journal) Gaskin, J.F., Andreas, J., Grewell, B.J., Haefliger, P., Harms, N.E. 2021. Diversity and origins of Butomus umbellatus (flowering rush) invasion in North America. Aquatic Botany. 173:103400. https://doi.org/10.1016/j.aquabot.2021.103400.Salinity and inundation effects on Iris pseudacorus: implications for tidal wetland invasion with sea level rise-(Peer Reviewed Journal) Grewell, B.J., Gallego-Tevar, B., Gillard, M.B., Futrell, C.J., Reicholf, R., Castillo, J.M. 2021. Salinity and inundation effects on Iris pseudacorus: implications for tidal wetland invasion with sea level rise. Plant and Soil. https://doi.org/10.1007/s11104-021-04997-8.Seed bank persistence of a South American cordgrass in invaded northern Atlantic and Pacific Coast estuaries-(Peer Reviewed Journal) Abbas, A.M., Pickart, A.J., Goldsmith, L.M., Davenport, D.N., Newby, B., Munoz-Rodriguez, A.F., Grewell, B.J., Castillo, J.M. 2021. Seed bank persistence of a South American cordgrass in invaded northern Atlantic and Pacific Coast estuaries. AoB Plants. 13:2. https://doi.org/10.1093/aobpla/plab014.High aqueous salinity does not preclude germination of invasive Iris pseudacorus from estuarine populations-(Peer Reviewed Journal) Gillard, M.B., Castillo, J.M., Mesgaran, M.B., Futrell, C.J., Grewell, B.J. 2021. High aqueous salinity does not preclude germination of invasive Iris pseudacorus from estuarine populations. Ecosphere. 12(5). Article e03486. https://doi.org/10.1002/ecs2.3486.Variation in sexual reproductive output among exotic taxa of Spartina (Poaceae)-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Munoz-Rodriguez, A.F., Nieva, F.J., Polo-Avila, A., Sanchez-Gullon, E., Soriano, J.J., Sanjose, I., Grewell, B.J., Castillo, J.M. 2021. Variation in sexual reproductive output among exotic taxa of Spartina (Poaceae). Aquatic Ecology. 55:107-123. https://doi.org/10.1007/s10452-020-09815-4.High genetic diversity in the clonal aquatic weed, Alternanthera philoxeroides in the United States-(Peer Reviewed Journal) Williams, D.A., Harms, N.E., Knight, I.A., Grewell, B.J., Futrell, C.J., Pratt, P.D. 2020. High genetic diversity in the clonal aquatic weed, Alternanthera philoxeroides in the United States. Invasive Plant Science and Management. 13(4):217-225. https://doi.org/10.1017/inp.2020.32.Germination syndrome divergence among pairs of sympatric sister species along an estuarine salinity gradient-(Peer Reviewed Journal) Castillo, J.M., Curado, G., Munoz-Rodriguez, A.F., Grewell, B.J. 2020. Germination syndrome divergence among pairs of sympatric sister species along an estuarine salinity gradient. Environmental and Experimental Botany. 181. Article 104274. https://doi.org/10.1016/j.envexpbot.2020.104274.Biological control of invasive water primroses, Ludwigia spp., in the United States: A feasibility assessment-(Peer Reviewed Journal) Reddy, A.M., Pratt, P.D., Grewell, B.J., Harms, N.E., Cabrera Walsh, G., Hernandez, C., Faltlhauser, A., Cibils-Stewart, X. 2021. Biological control of invasive water primroses, Ludwigia spp., in the United States: A feasibility assessment. Journal of Aquatic Plant Management. 59s:67–77. https://apms.org/journal/.Heat stress effects on sexual reproductive processes of a threatened halophyte-(Peer Reviewed Journal) Leon-Osper, M., Infante-Izquierdo, M.D., Soriano, J.J., Nieva, F.J., Grewell, B.J., Castillo, J.M., Munoz-Rodriguez, A.F. 2020. Heat stress effects on sexual reproductive processes of a threatened halophyte. South African Journal of Botany. 133:184-192. https://doi.org/10.1016/j.sajb.2020.07.016.Effects of heavy metal pollution on germination and early seedling growth in native and invasive Spartina cordgrasses-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Polo-Avila, A., Sanjose, I., Castillo, J.M., Nieva, F.J., Grewell, B.J., Munoz-Rodriguez, A.F. 2020. Effects of heavy metal pollution on germination and early seedling growth in native and invasive Spartina cordgrasses. Marine Pollution Bulletin. 158:111376. https://doi.org/10.1016/j.marpolbul.2020.111376.Host specificity of Liothrips ludwigi, a candidate biological control agent of invasive Ludwigia spp. in the USA-(Peer Reviewed Journal) Reddy, A.M., Pratt, P.D., Grewell, B.J., Harms, N.E., Cabrera Walsh, G., Hernandez, C.M., Falthauser, A. 2020. Host specificity of Liothrips ludwigi, a candidate biological control agent of invasive Ludwigia spp. in the USA. Biocontrol Science and Technology. 30(11):1268-1274. https://doi.org/10.1080/09583157.2020.1778637.From physiology to salt marsh management challenges with sea level rise: the case of native Spartina foliosa, invasive S. densiflora and their hybrid-(Peer Reviewed Journal) Gallego-Tevar, B., Peinado-Torrubia, P., Alvarez, R., Grewell, B.J., Castillo, J.M. 2020. From physiology to salt marsh management challenges with sea level rise: the case of native Spartina foliosa, invasive S. densiflora and their hybrid. Conservation Physiology. 8(1). Article coaa053. https://doi.org/10.1093/conphys/coaa053.Seed source regions drive fitness differences in invasive macrophytes-(Peer Reviewed Journal) Gillard, M., Drenovsky, R.E., Thiebaut, G., Tarayre, M., Futrell, C.J., Grewell, B.J. 2020. Seed source regions drive fitness differences in invasive macrophytes. American Journal of Botany. 107(5):749-760. https://doi.org/10.1002/ajb2.1475.Invasive alligator weed (Alternanthera philoxeroides) expands range in northern California: Feather River populations-(Abstract Only)Transgressivity in key functional traits rather than phenotypic plasticity promotes stress tolerance in a hybrid cordgrass-(Peer Reviewed Journal) Gallego-Tevar, B., Grewell, B.J., Drenovsky, R.E., Castillo, J.M. 2019. Transgressivity in key functional traits rather than phenotypic plasticity promotes stress tolerance in a hybrid cordgrass. Plants. 8(12):594. https://doi.org/10.3390/plants8120594.Changes to the functional traits of phosphoenolpyruvate carboxylase following hybridization in C-4 halophytes-(Peer Reviewed Journal) Gallego-Tevar, B., Peinado, P., Alvarez, R., Gandullo, J., Grewell, B.J., Figueroa, E., Castillo, J.M. 2019. Changes to the functional traits of phosphoenolpyruvate carboxylase following hybridization in C-4 halophytes. Physiologia Plantarum. 169(1):83-98. https://doi.org/10.1111/ppl.13053.The role of exotic and native hybrids during ecological succession in salt marshes-(Peer Reviewed Journal) Gallego-Tevar, B., Grewell, B.J., Figueroa, E., Castillo, J.M. 2019. The role of exotic and native hybrids during ecological succession in salt marshes. Journal of Experimental Marine Biology and Ecology. 523:151282. https://doi.org/10.1016/j.jembe.2019.151282.Seedling emergence from seed banks in Ludwigia hexapetala invaded wetlands: Implications for restoration-(Peer Reviewed Journal) Grewell, B.J., Gillard, M., Futrell, C.J., Castillo, J.M. 2019. Seedling emergence from seed banks in Ludwigia hexapetala invaded wetlands: Implications for restoration. Plants. 8(11):451. https://doi.org/10.3390/plants8110451.Interactive effects of salinity and inundation on native Spartina foliosa, invasive S. densiflora, and their hybrid from San Francisco Estuary, California-(Peer Reviewed Journal) Gallego-Tevar, B., Grewell, B.J., Futrell, C.J., Drenovsky, R.E., Castillo, J.M. 2019. Interactive effects of salinity and inundation on native Spartina foliosa, invasive S. densiflora, and their hybrid from San Francisco Estuary, California. Annals Of Botany. 125(2):377-389. https://doi.org/10.1093/aob/mcz170.Resprouting potential of rhizome fragments from invasive macrophyte reveals superior colonization ability of the diploid congener-(Peer Reviewed Journal) Grewell, B.J., Futrell, C.J., Iannucci, M., Drenovsky, R.E. 2019. Resprouting potential of rhizome fragments from invasive macrophyte reveals superior colonization ability of the diploid congener. AoB Plants. 11(6). https://doi.org/10.1093/aobpla/plz071.Differential effects of increasing salinity on germination and seedling growth of native and exotic invasive cordgrasses-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Castillo, J.M., Grewell, B.J., Nieva, F.J., Munoz-Rodriguez, A.F. 2019. Differential effects of increasing salinity on germination and seedling growth of native and exotic invasive cordgrasses. Plants. 8(10):372. https://doi.org/10.3390/plants8100372.High salinity exposure does not preclude germination of invasive Iris pseudacorus from populations along a Delta – San Francisco Estuary salinity gradient [-(Abstract Only) Gillard, M., Castillo, J.M., Mesgaran, M.B., Futrell, C.J., Grewell, B.J. 2019. High salinity exposure does not preclude germination of invasive Iris pseudacorus from populations along a Delta – San Francisco Estuary salinity gradient [. Meeting Abstract. Abstract.Exploring the germination ecology of Iris pseudacorus populations invading California wetlands [abstract]-(Abstract Only) Gillard, M., Castillo, J.M., Mesgaran, M.B., Futrell, C.J., Grewell, B.J. 2019. Exploring the germination ecology of Iris pseudacorus populations invading California wetlands [abstract]. Meeting Abstract. Abstract.Confronting sea level rise: combined effects of salinity and inundation on C4 metabolism of cordgrasses and their hybrids-(Abstract Only) Castillo, J.M., Peinado-Torrubia, P., Alvarez-Morales, M., Grewell, B.J., Drenovsky, R.E., Gallego-Tevar, B. 2019. Confronting sea level rise: combined effects of salinity and inundation on C4 metabolism of cordgrasses and their hybrids. Meeting Abstract. Abstract.Fruit set, seed viability and germination of the European native Spartina maritima in
Southwest Iberian Peninsula-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Castillo, J.M., Nieva, F.J., Rotundu, I., David, F.T., Grewell, B.J., Munoz-Rodriguez, A.F. 2019. Fruit set, seed viability and germination of the European native Spartina maritima in Southwest Iberian Peninsula. Wetlands. https://doi.org/10.1007/s13157-019-01188-1.Morphological and anatomical evidence supports differentiation of new interspecific hybrids from native Spartina maritima and invasive S. densiflora (Poaceae, subfamily Chloridoideae)-(Peer Reviewed Journal) Infante-Izquierdo, M.D., Gallego-Tevar, B., Sanchez-Gullon, E., Nieva, F.J., Grewell, B.J., Castillo, J.M., Munoz-Rodriguez, A.F. 2019. Morphological and anatomical evidence supports differentiation of new interspecific hybrids from native Spartina maritima and invasive S. densiflora (Poaceae, subfamily Chloridoideae). Plant Systematics and Evolution. 305(7):531-547. https://doi.org/10.1007/s00606-019-01591-5.Combined effects of salinity and inundation on phosphoenolpyruvate carboxylase activity in two Spartina species and their hybrid-(Abstract Only) Gallego-Tevar, B., Peinado-Torrubia, P., Alvarez-Morales, M., Grewell, B.J., Castillo, J.M. 2019. Combined effects of salinity and inundation on phosphoenolpyruvate carboxylase activity in two Spartina species and their hybrid. Meeting Abstract. Abstract.Seasonal variation in growth, biomass and carbon storage allocation of Ludwigia hexapetala along water depth gradients in the Russian River Watershed [abstract]-(Abstract Only)Noteworthy collections, California (Alternanthera philoxeroides)-(Peer Reviewed Journal) Walden, G., Skurka Darin, G., Grewell, B.J., Kratville, D., Mauldin, J., O'Brian, J., O'Rear, T., Ougzin, A., Van Susteren, J., Woods, P. 2019. Noteworthy collections, California (Alternanthera philoxeroides). Madrono. 66(1):4-7. https://doi.org/10.3120/0024-9637-66.1.4.Some like it hot: Maternal-switching with climate change modifies formation of invasive Spartina hybrids-(Peer Reviewed Journal) Gallego-Tevar, B., Infante-Izquierdo, M.D., Figueroa, E., Munoz-Rodriquez, A.F., Grewell, B.J., Castillo, J.M. 2019. Some like it hot: Maternal-switching with climate change modifies formation of invasive Spartina hybrids. Frontiers in Plant Science. 10:484. https://doi.org/10.3389/fpls.2019.00484.Differential tolerance of native and invasive tree seedlings from arid African deserts to drought and shade-(Peer Reviewed Journal) Abbas, A.M., Rubio-Casal, A., De Cires, A., Grewell, B.J., Castillo, J.M. 2019. Differential tolerance of native and invasive tree seedlings from arid African deserts to drought and shade. South African Journal of Botany. 123:228-240. https://doi.org/10.1016/j.sajb.2019.03.018.Genetic structure of Spartina hybrids between native Spartina maritima and invasive Spartina densiflora in southwest Europe-(Peer Reviewed Journal) Gallego-Tévar, B., Grewell, B.J., Vallet, D., Rousseau, H., Keller, J., Lima, O., Dreano, S., Salmon, A., Figueroa, E., Ainouche, M., Castillo, J. 2019. Genetic structure of Spartina hybrids between native Spartina maritima and invasive Spartina densiflora in southwest Europe. Perspectives in Plant Ecology, Evolution and Systematics. 37:26-38. https://doi.org/10.1016/j.ppees.2019.02.001.Phenotypic plasticity of polyploid plant species promotes transgressive behavior in their hybrids-(Peer Reviewed Journal) Gallego-Tevar, B., Rubio-Casal, A., De Cires, A., Figueroa, E., Grewell, B.J., Castillo, J.M. 2018. Phenotypic plasticity of polyploid plant species promotes transgressive behavior in their hybrids. AoB Plants. 10(5):ply055. https://doi.org/10.1093/aobpla/ply055.Realized niche and spatial pattern of native and exotic halophyte hybrids-(Peer Reviewed Journal) Gallego-Tevar, B., Curado, G., Grewell, B.J., Figueroa, E., Castillo, J.M. 2018. Realized niche and spatial pattern of native and exotic halophyte hybrids. Oecologia. 188(3):849-862. https://doi.org/10.1007/s00442-018-4251-y.Dynamics of Ludwigia hexapetala invasion at three spatial scales in a regulated river-(Peer Reviewed Journal) Skaer Thomason, M.J., Grewell, B.J., Netherland, M.D. 2018. Dynamics of Ludwigia hexapetala invasion at three spatial scales in a regulated river. Wetlands. 38:1285-1298. https://doi.org/10.1007/s13157-018-1053-2.Functional trait responses of invasive Ludwigia species to contrasting hydrologic conditions-(Abstract Only) Drenovsky, R.E., Reicholf, R., Futrell, C.J., Gallego-Tevar, B., Grewell, B.J. 2018. Functional trait responses of invasive Ludwigia species to contrasting hydrologic conditions. Weed Abstracts. [Abstract].Climate warming stimulates germination and inital biomass production by seedlings of two invasive Ludwigia congeners-(Abstract Only) Gillard, M., Grewell, B.J., Futrell, C.J., Deleu, C., Thiebaut, G. 2018. Climate warming stimulates germination and inital biomass production by seedlings of two invasive Ludwigia congeners. Botanical Society of America Abstracts. [Abstract].Temporal and nonlinear dispersal patterns of Ludwigia hexapetala in a regulated river-(Peer Reviewed Journal) Skaer Thomason, M.J., Grewell, B.J., Netherland, M.D. 2018. Temporal and nonlinear dispersal patterns of Ludwigia hexapetala in a regulated river. Wetlands Ecology and Management. 1-14. https://doi.org/10.1007/s13157-018-1053-2.Low genetic diversity contrasts with high phenotypic variability in heptaploid Spartina densiflora populations invading the Pacific Coast of North America-(Peer Reviewed Journal) Castillo, J.M., Gallego-Tevar, B., Figueroa, E., Grewell, B.J., Vallet, D., Rousseau, H., Keller, J., Lima, O., Dreano, S., Salmon, A., Ainouche, M. 2018. Low genetic diversity contrasts with high phenotypic variability in heptaploid Spartina densiflora populations invading the Pacific Coast of North America. Ecology and Evolution. 8(10):4992-5007. https://doi.org/10.1002/ece3.4063.The effect of invasive hybrid taxa on the ecological succession of coastal marshes-(Abstract Only) Gallego-Tevar, B., Curado, G., Grewell, B.J., Figueroa, E., Castillo, J.M. 2018. The effect of invasive hybrid taxa on the ecological succession of coastal marshes. Biological Invasions. [Abstract].Germination and seedling growth of water primroses: A cross experiment between two invaded ranges with contrasting climates-(Peer Reviewed Journal) Gillard, M., Grewell, B.J., Futrell, C.J., Deleu, C., Thiebaut, G. 2017. Germination and seedling growth of water primroses: A cross experiment between two invaded ranges with contrasting climates. Frontiers in Plant Science. 8:1677. https://doi.org/10.3389/fpls.2017.01677.Vegetative regeneration of invasive Ludwigia cytotypes from clonal bud banks across resource gradients: colonizing diploid outperforms polyploid-(Abstract Only) Grewell, B.J., Drenovsky, R.E., Futrell, C.J., Iannucci, M. 2018. Vegetative regeneration of invasive Ludwigia cytotypes from clonal bud banks across resource gradients: colonizing diploid outperforms polyploid. Meeting Abstract. International Symposium on Aquatic Plants proceedings.Variation in germination capacity and seedling growth of water primroses in contrasting climates from two invaded continental ranges-(Abstract Only) Gillard, M., Grewell, B.J., Futrell, C.J., Deleu, C., Thiebaut, G. 2018. Variation in germination capacity and seedling growth of water primroses in contrasting climates from two invaded continental ranges. Meeting Abstract. 15th International Symposium on Aquatic Plants, Queenstown, New Zealand, proceedings.Responses to salinity in invasive cordgrass hybrids and their parental species (Spartina) in a scenario of sea level rise and climate change-(Abstract Only) Castillo, J.M., Gallego-Tevar, B., Grewell, B.J. 2017. Responses to salinity in invasive cordgrass hybrids and their parental species (Spartina) in a scenario of sea level rise and climate change. Ecological Society of America Abstracts. [Abstract].Spatial dynamics of the vegetation community associated with an invasive emergent macrophyte in a regulated river.-(Abstract Only) Skaer Thomason, M.J., Grewell, B.J. 2017. Spatial dynamics of the vegetation community associated with an invasive emergent macrophyte in a regulated river.. Society of Wetland Scientists. [Abstract].Climate warming and water primroses: germination responses of populations from two invaded ranges-(Peer Reviewed Journal) Gillard, M., Grewell, B.J., Deleu, C., Thiebaut, G. 2016. Climate warming and water primroses: germination responses of populations from two invaded ranges. Aquatic Botany. 136(2017):155-163.Adaptive management of perennial pepperweed for endangered specias and tidal marsh recovery-(Abstract Only)Trait responses of invasive aquatic macrophyte congeners: colonizing diploid outperforms polyploid-(Peer Reviewed Journal) Grewell, B.J., Skaer Thomason, M.J., Futrell, C.J., Iannucci, M., Drenovsky, R. 2016. Trait responses of invasive aquatic Ludwigia congeners (Onagraceae):  effects of ploidy and resource availability. AoB Plants. 8:plw014. doi :10.1093/aobpla/plw014.Phenotypic plasticity and population differentiation in response to salinity in the invasive cordgrass Spartina densiflora-(Peer Reviewed Journal) Grewell, B.J., Skaer Thomason, M.J., Castillo, J.M., Drenovsky, R.E. 2016. Phenotypic plasticity and population differentiation in response to salinity in the invasive cordgrass Spartina densiflora. Biological Invasions. 18:2175-2187.Variation in tussock traits of the invasive cordgrass Spartina densiflora along the Pacific Coast of North America-(Peer Reviewed Journal) Castillo, J.M., Grewell, B.J., Pickart, A., Figuerora, M.E., Sytsma, M.D. 2016. Variation in tussock traits of the invasive cordgrass Spartina densiflora along the Pacific Coast of North America. Biological Invasions. 18:2159-2174.Establishing research and management priorities for invasive water primroses (Ludwigia spp.)-(Government Publication) Grewell Brenda J., Michael D. Netherland, Meghan J. Skaer Thomason. 2016.  Establishing research and management priorities for invasive water primroses (Ludwigia spp.).  ERDC/EL TR-16-2, US Army Corps of Engineers Research and Development Center, Environmental Laboratory, Vicksburg, MSClonal integration in Ludwigia hexapetala under different light regimes-(Peer Reviewed Journal) Glover, R., Drenovsky, R., Futrell, C.J., Grewell, B.J. 2015. Clonal integration in Ludwigia hexapetala under different light regimes. Aquatic Botany. 122:40-46.Intraspecific and phenotypic variation in salinity responses of invasive Spartina densiflora from Pacific estuaries of North America-(Proceedings) Grewell, B.J., Castillo, J.M., Skaer Thomason, M.J., Drenovsky, R.E. 2016. Intraspecific and phenotypic variation in salinity responses of invasive Spartina densiflora from Pacific estuaries of North America. In: Ainouche, M. (ed.)Proceedings 4th International Conference on Invasive Spartina, July 7/10, 2014 Universite de Rennes 1, Rennes, France, p. 101-106.Changes in tussock architecture of invasive Spartina densiflora (Poaceae) along the Pacific Coast of North America-(Proceedings) Castillo, J.M., Grewell, B.J., Pickart, A., Bortolus, A., Figuerora, M., Systma, M.D. 2016. Changes in tussock architecture of invasive Spartina densiflora (Poaceae) along the Pacific Coast of North America. Ainouche, M. (ed.) Proceedings 4th International Conference on Invasive Spartina, July 7/10, 2014 Universite de Rennes 1, Rennes, France, p. 95-100Effectiveness of the aquatic halophyte Sarcocornia perennis spp. perennis as a biotool for ecological restoration of metal-contaminated salt marshes-(Peer Reviewed Journal) Curadmo, G., Grewell, B.J., Figueroa, E., Castillo, J.M. 2014. Effectiveness of the aquatic halophyte Sarcocornia perennis spp. perennis as a biotool for ecological restoration of metal-contaminated salt marshes. Journal Of Water Air And Soil Pollution. 225(9):1-14. DOI: 10.1007/s11270-014-2108-5.Phenotypic plasticity of invasive Spartina densiflora (Poaceae) along a broad latitudinal gradient on the Pacific Coast of North America-(Peer Reviewed Journal) Castillo, J.M., Grewell, B.J., Pickart, A., Bortolus, A., Pena, C., Figuerora, M.E., Sytsma, M.D. 2014. Phenotypic plasticity of invasive Spartina densiflora (Poaceae) along a broad latitudinal gradient on the Pacific Coast of North America. American Journal of Botany. 101(3):448-458.2013. Wetlands. In: Mooney, H. and Zavaleta, E., editors. Ecosystems of California: A Source Book. Berkeley, CA: University of California Press-(Book / Chapter) Duffy, W.G., Garone, P., Grewell, B.J., Kahara, S.N., Fleskes, J., Helm, B., Moyle, P.B., Records, R., Silveira, J. 2016. Wetlands. In: Mooney, H. and Zavaleta, E., editors. Ecosystems of California: A Source Book. Berkeley, CA: University of California Press. p. 669-692.Native plant restoration combats environmental change: development of carbon and nitrogen sequestration capacity using small cordgrass in European salt marshes-(Peer Reviewed Journal) Curado, G., Rubio-Casai, A., Figueroa, E., Grewell, B.J., Castillo, J.M. 2013. Native plant restoration combats environmental change: development of carbon and nitrogen sequestration capacity using small cordgrass in European salt marshes. Environmental Monitoring and Assessment. 185:8439-8449.  DOI 10.1007/s10661-013-3185-4.Sea change under climate change: case studies in rare plant conservation from the dynamic San Francisco Estuary-(Peer Reviewed Journal) Grewell, B.J., Espeland, E.K., Fiedler, P.L. 2013. Sea change under climate change: case studies in rare plant conservation from the dynamic San Francisco Estuary. Botany. 91:309-318.Shifting mosaics: vegetation of Suisun Marsh-(Book / Chapter) Grewell, B.J., Baye, P.R., Fiedler, P.L. 2014. Shifting mosaics: vegetation of Suisun Marsh. In: Moyle, P.B., Manfree, A., Fiedler, P.L, editors. Suisun Marsh: Ecological history and possible futures. Berkeley, California:University of California Press. p.65-101.Wastewater polishing by a channelized macrophyte-dominated wetland and anaerobic digestion of the harvested phytomass-(Peer Reviewed Journal) Cohen, M.J., Hare, C., Kozlowski, J., Mccormick, R.S., Chen, L., Parish, M., Schneider, L., Knight, Z., Nelson, T.A., Grewell, B.J. 2012. Wastewater polishing by a channelized macrophyte-dominated wetland and anaerobic digestion of the harvested phytomass. Journal of Environmental Science and Health. 48(3):319-330.A functional trait perspective on plant invasion-(Review Article) Drenovsky, R.E., Grewell, B.J., D'Antonio, C.M., Funk, J.L., James, J.J., Molinari, N., Parker, I.M., Richards, C.L. 2012. A functional trait perspective on plant invasion. Annals Of Botany. 110:141-153.Evaulation of perennial pepperweed (Lepidium latifolium) management in a seasonal wetland in San Francisco Estuary prior to restoration of tidal hydrology-(Peer Reviewed Journal) Whitcraft, C.R., Grewell, B.J. 2011. Evaulation of perennial pepperweed (Lepidium latifolium) management in a seasonal wetland in San Francisco Estuary prior to restoration of tidal hydrology. Wetlands Ecology and Management. 20:35-45.Flora and ecological profile of native and exotic estuarine wetland vegetation by hydrogeomorphic setting at Rush Ranch, Suisun Marsh-(Government Publication) Grewell, B.J., Whitcraft, C., Baye, P. 2011. Flora and ecological profile of native and exotic estuarine wetland vegetation by hydrogeomorphic setting at Rush Ranch, Suisun Marsh. Pg. 79-144 in: Ferner, M.C. editor, 2011.  A profile of the San Francisco Bay National Estuarine Research Reserve. San Francisco Bay National Estuarine Research Reserve.  San Francisco, California. 345 p. plus appendix.Volatiles emissions from the flea beetle Altica litigata (Coleoptera: Chrysomelidae) associated with invasive Ludwigia hexapetala-(Peer Reviewed Journal) Carruthers, R.I., Franc, M.K., Gee, W.S., Cosse, A.A., Grewell, B.J., Beck, J.J. 2011. Volatiles emissions from the flea beetle Altica litigata (Coleoptera: Chrysomelidae) associated with invasive Ludwigia hexapetala. Chemoecology. 21(4):253-259. https://doi.org/10.1007/s00049-011-0090-6.Estuarine Vegetation at Rush Ranch Open Space Preserve, San Francisco Bay National Estuarine Research Reserve, California-(Peer Reviewed Journal) Grewell, B.J., Whitcraft, C., Baye, P. 2011. Estuarine Vegetation at Rush Ranch Open Space Preserve, San Francisco Bay National Estuarine Research Reserve, California. San Francisco Estuary and Watershed Science. 9(3):1-29 and Appendix, 21pp.Tidal wetland vegetation and ecotone profiles: The Rush Ranch Open Space Preserve-(Book / Chapter) Whitcraft, C., Grewell, B.J., Baye, P.R. 2012. Tidal wetland vegetation and ecotone profiles: The Rush Ranch Open Space Preserve. In: Palaima, A., editor. Ecology, Conservation, and Restoration of Tidal Marshes. Berkeley, California: University of California Press. p. 113-114.Ludwigia-(Book / Chapter) Hoch, P.C., Grewell, B.J. 2012. Ludwigia. Book Chapter. In: Baldwin, B.G. (convening ed.)  The Jepson Manual, Vascular Plants of California, 2nd edition.  Berkeley, CA: University of California Press. p. 948-951.Clonal spread of invasive Ludwigia hexapetala and L. grandiflora in freshwater wetlands of California-(Peer Reviewed Journal) Okada, M., Grewell, B.J., Jasieniuk, M. 2009. Clonal spread of invasive Ludwigia hexapetala and L. grandiflora in freshwater wetlands of California. Aquatic Botany. 91(3):123-256.HEMIPARASITES GENERATE ENVIRONMENTAL HETEROGENEITY AND ENHANCE SPECIES COEXISTENCE IN SALT MARSHES-(Peer Reviewed Journal) Grewell, B.J. 2008. Hemiparasites generate environmental heterogeneity and enhance species coexistence in salt marshes. Ecological Applications. 18(5):1297-1306.PARASITE FACILITATES PLANT SPECIES COEXISTENCE IN A COASTAL WETLAND.-(Peer Reviewed Journal) Grewell, B.J. 2008. Parasite facilitates plant species coexistence in a coastal wetland. Ecology. 89(6): 1481-1488.RARE PLANTS IN THE GOLDEN GATE ESTUARY: SCALE AND UNDERSTANDING-(Peer Reviewed Journal) Fiedler, P.L., Keever, M.E., Grewell, B.J., Partridge, D.J. 2007. Rare plants in the golden gate estuary: scale and understanding. Australian Journal of Botany.55:206-220.ESTUARINE WETLANDS (CHAPTER: TERRESTRIAL VEGETATION OF CALIFORNIA)-(Book / Chapter) Grewell, B.J., Callaway, J.C., Ferren, W.R. 2007. Estuarine wetlands.  In: Barbour, M.G., Keeler-Wolf, T., Schoenherr, A. A., editors.  Terrestrial Vegetation of California. 3rd edition. Berkeley, California: University of California Press. p.124-154.
 ProjectsIntegrated Weed Management and Restoration Strategies to Protect Water Resources and Aquatic and Wetland Ecosystems of the Far Western U.S.In-House Appropriated (D)Accession Number:439510Invasive Plant Management Strategies for Endangered Plant Recovery and Tidal Wetland Restoration under Changing Environmental ConditionsReimbursable Cooperative Agreement (R)Accession Number:443598Reducing the Impact of Invasive Weeds in Pacific West Estuaries through Plant Community RestorationNon-Assistance Cooperative Agreement (S)Accession Number:438655


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