Rebecca Lewison


Department of Biology
Professor, Biology

Office/Lab: SDSU Main Campus, Physical Science 157A/157
Phone: 619-594-8287 (office)/619-594-8698 (lab)

Conservation Ecology Lab


I am a conservation ecologist and an Associate Professor at San Diego State University. I also serve as Director for the Institute for Ecological Management and Monitoring, a multi-disciplinary research institute at SDSU. I received my Bachelor’s degree from Vassar College and went on to complete my doctorate in Ecology at the University of California, Davis Using innovative field, quantitative and lab-based approaches, my research focuses on vulnerable wildlife populations that live in both terrestrial and aquatic environments and face pressing conservation issues, e.g. fragmentation, habitat loss, harvest and incidental mortality, disease and other disturbances. Over the past decade, I have been spearheading integrative research in conservation ecology, policy and resource use, with expertise and experience across a wide taxonomic range of organisms. I has served as leader of several research initiatives designed to develop new tools and methodological approaches to understand the magnitude and extent, of population-level and landscape level effects of human-mediated activities.

Members of the Lewison Conservation Ecology Lab work on a variety of taxa using a wide range of methodologies. What unites the lab is a dedication to understanding the impacts of human interaction and disturbance on vertebrates of conservation concern. Below are some of our general research interests and links to projects in the lab.

Fisheries and bycatch
In the past 50 years, total world fisheries production has increased steadily from 19.3 million tons in 1950 to more than 154 million tons today. Beyond direct effects of fish removal, fishing also leads to incidental capture of non-target species, termed bycatch. Bycatch species can be species of conservation concern (e.g. marine mammals, sea turtles, seabirds) or commercially viable non-target species, e.g. sharks. Fisheries bycatch is one of the primary causes of observed declines of seabirds, marine mammals, sharks and large predatory fishes, collectively termed marine megafauna. For some depleted species, such as Pacific leatherback (Dermochelys coriacea), vaquita (Phocoena sinus), and the Atlantic humpbacked dolphin (Sousa teuszii), fisheries bycatch has been identified as the single largest threat to extant populations. Characterizing and quantifying bycatch and bycatch limits presents a formidable challenge and is the focus of a number of research projects in the Lewison lab.

Ecotoxicology and ecosystem health
Ecotoxicology is the multidisciplinary study of the effects of toxic chemicals on biological organisms, especially at the population, community, and ecosystem levels. The ultimate goal of this field is to predict the effects of pollution so proactive approaches may be taken to prevent or remediate detrimental effects. In ecosystems already impacted by pollution (i.e. San Diego Bay), ecotoxicological studies can inform the best course of action to restore ecosystem services and functions efficiently and effectively. Members of the Lewison Lab collaborate with Dr. Eunha Hoh in the Graduate School of Public Health to address toxicological impacts to vulnerable vertebrates.

Habitat Utilization
Characterizing the spatial and temporal utilization of habitat by organisms is fundamental aspect of conservation ecology. By studying habitat utilization researchers are able to gain insights into resource use and requirements, behavior, inter and intra-speciific interactions, protected area design, and numerous other factors that are necessary to designing effective wildlife management and conservation strategies. Species’ habitat utilization can be studied via direct observations and remote sensing technologies (e.g. satellite telemetry), which can then be combined with data on environmental factors to describe and predict habitat use patterns.

Understanding how fragmented populations are connected is important for effective management and conservation. Connectivity can refer to either the movement of individuals from one habitat to another or the movement of genes through adjacent populations, commonly referred to as gene flow. Since animal movement and gene flow can be difficult to observe, scientists have developed multiple tools to empirically test for connectivity including both telemetry and genetic analyses. Telemetry employs the use of radio, acoustic, and satellite tags to monitor animal presence and movement. Genetics techniques allow researchers to compare the DNA of individuals in different potential populations to test whether there is likely any genetic exchange among them.

Trophic Ecology
Trophic ecology refers to the feeding relationships of an organism within an ecosystem. Determining the trophic dynamics and interactions of organisms generates an overall understanding of an organism’s role in ecosystem function and nutrient flow processes. Many animals exhibit complex life histories and cryptic behavior which make it difficult to study their trophic interactions. Tools such as stable isotope analysis allow us to investigate the trophic ecology of many animals in order to understand their habitat use, role in mediating nutrient flow, trophic status, critical habitat and migratory habits all of which contribute to developing more effective management and conservation efforts.

Population Dynamics
Under construction

Recent publications from the Lewison Lab (2003-present):

Madrak, S.V., Lewison, R.L., Seminoff, J.A., Eguchi, T. 2016. Characterizing response of east Pacific green turtles to changing temperatures: using acoustic telemetry in a highly urbanized environment. Animal Biotelemetry, in press.

Baldwin, C., Lewison, R.L., Lieske, S.N, Beger. M., Hines, E., Dearden, P., Rudd, M.A., Jones, C., Satumanatpan,S., Junchompoo, C.2016, Using the DPSIR framework for transdisciplinary training and knowledge elicitation in the Gulf of Thailand. Ocean & Coastal Management 134:163-172 (pdf)

Drake KK, Bowen L, Nussear KE, Esque TE, Berger AJ, Custer NA, Waters SC, Johnson JD, Miles AK, Lewison RL (in press) Negative impacts of invasive plants on conservation of sensitive desert wildlife. Ecosphere.

Champagne, C. D., Kellar, N. M., Crocker, D. E., Wasser, S. K., Booth, R. K., Trego, M. L., Houser, D. S. (2016) Blubber Cortisol Qualitatively Reflects Circulating Cortisol Concentrations in Bottlenose Dolphins. Marine Mammal Science. doi:10.1111/mms.12352 (pdf)

Chen H, Koprowski JL (2016) Barrier effects of roads on an endangered forest obligate: influences of traffic, road edges, and gaps. Biological Conservation 199: 33-40.

McDonald SL, Lewison RL, Roady SE, Kramer RJ, Rigling-Gallagher D, Read AJ (2016) Comparing stakeholder perceptions with empirical outcomes from negotiated rulemaking policies: Is participant satisfaction a proxy for policy success? Marine Policy 73: 224–230. (pdf)

McGowan J, Beger M, Lewison RL, Harcourt R, Campbell H, Priest M, Dwyer R, Lin H-Y, Lentini P, Dudgeon C., McMahon C, Watts M, Possingham H (2016) Linking research using animal-borne telemetry with the needs of conservation management. Journal of Applied Ecology, doi: 10.1111/1365-2664.12755 (pdf)

Gaos AR, Lewison RL, Liles MJ, Gadea V, Altamirano E, Henríquez AV, Torres P, Urteaga J, Vallejo F, Baquero A, LeMArie C, Muñoz JP, Chaves JA, Hart CE, Peña de Niz A, Chácon D, Fonseca L, Otterstrom S, Yañez IL, LaCasella EL, Frey A, Jensen MP, Dutton PH (2016) Hawksbill turtle terra incognita: conservation genetics of eastern Pacific rookeries. Ecology and Evolution. doi: 10.1002/ece3.1897. (pdf)

Lewison RL, Rudd MA, Al-Hayek M, Baldwin C, Beger, M, Lieske SN, Jones C, Sutumanatpan S, Junchompoo C, Hines E (2016) How the DPSIR framework can be used for structuring problems and facilitating empirical research in coastal systems. Environmental Science and Policy 56:110–119. (pdf)

Chen H, Koprowski JL (2016) Differential effects of roads and traffic on space use and movements of native forest-dependent and introduced edge-tolerant species. PLOS ONE 11(1): e0148121.

Kellar, N. M., Catelani, K. N., Robbins, M. N., Allen, C. D., Trego, M. L., Danil, K., Chivers, S. J. (2015) Blubber cortisol: A potential tool for assessing stress response in free-ranging dolphins without effects due to sampling. PLoS ONE. DOI: 10.1371/journal.pone.0115257 (pdf)

Debridge JD, Posthumus EE, Chen H, Koprowski JL (2015) Solenodon paradoxus (Soricomorpha: Solenodontidae). Mammalian Species 47: 100-106.

Chen H, Koprowski JL (2015) Landscape of anthropogenic noise influences animal occurrence and space use. Biological Conservation 192: 315-322.

Komoroske LM, Lewison RL (2015) Addressing fisheries bycatch in a changing world. Frontiers in Marine Science. doi: 10.3389/fmars.2015.00083 (pdf)

Dillingham PW, Moore JE, Fletcher D, Cortés E, Curtis KA, James K, Lewison RL (In press) Improved estimation of intrinsic growth rmax: integrating matrix models and allometry. Ecological Applications. (pdf)

Teh LSL, Teh LCL, Hines El, Jumchompoo C, Lewison RL (2015) Contextualising the coupled socio-ecological conditions of marine megafauna bycatch, Ocean & Coastal Management, (pdf)

Jennings MK, Lewison RL, Vickers TW, Boyce WM (2015) Puma response to effects of fire and urbanization. Journal of Wildlife Management, DOI: 10.1002/jwmg.1018. (pdf)

Carver S, Bevins SN, Lappin MR, Boydston EE, Lyren LM, Alldredge MW, Logan KA, Sweanor LL, Riley SPD, Serieys LEK, Fisher RN, Vickers TW, Boyce WM, McBride R, Cunningham MC, Jennings M, Lewis JS, Lunn T, Crooks KR, VandeWoude S (In press) Pathogen exposure varies widely among sympatric populations of wild and domestic felids across the United States. Ecological Applications. (pdf)

Maxwell SM, Hazen EL, Lewison RL, Dunn, DC, Bailey H, Bograd SJ, Hobday, AJ, Bennett M, Benson S, Briscoe DK, Caldwell M, Costa, D, Dewar H, Eguchi, T, Fossette, S, Hazen L, Kohin S, Sippel T, Crowder LB. (in press) Dynamic Oceans need dynamic management. Marine Policy (pdf)

Curtis KA, Moore JE, Boyd C, Dillingham P, Lewison R, Taylor B, James KC (2015) Managing catch of marine megafauna: guidelines for setting limit reference points. Marine Policy 61: 249–263. Available from (pdf)

Lewison, R.L., Hobday, A., Maxwell, S., Hazen, E., Hartog, J.R., Dunn, D. C., Briscoe, D., Fossette, S., O’Keefe, C.E., Barnes-Mauthe, M., Abecassis, M., Bograd, S., Bethoney, N.D., Bailey, H., Wiley, D., Andrews, S., Hazen, L., Crowder, L.B. 2015. Dynamic ocean management: Identifying the critical ingredients of dynamic approaches to ocean resource management. Bioscience. (pdf)
Press releases:

Millow CJ, MacIntosh SA, Lewison RL, Dodder NG, Hoh E. 2015. Identifying bioaccumulative halogenated organic compounds using a nontargeted analytical approach: seabirds as sentinels. PlosOne, DOI: 10.1371/journal.pone.0127205 (pdf)

James K, Lewison RL, Dillingham P, Curtis A, Moore JE. 2015. Drivers of retention and discards of elasmobranch non-target catch. Environmental Conservation, doi:10.1017/S0376892915000168 (pdf)

Mccauley DJ, Dawson TE, Power ME, Finlay, JC, Ogada M, Gower DB, Caylor K, Nyingi WD, Githaiga JM, Nyunja J, Joyce FH, Lewison, RL, Brashares JS. 2015. Carbon stable isotopes suggest that hippopotamus-vectored nutrients subsidize aquatic consumers in an East African river. Ecosphere, 6(4) Article 52. (pdf)

Drake K, Esque TC, Nussear K., DeFalco L, Scoles-Sciulla SJ, Modlin AT, Medica PA. 2015. Desert Tortoise Use of Burned Habitat in the Eastern Mojave Desert. Journal of Wildlife Management; DOI: 10.1002/jwmg.874 (pdf)

Bowen L, Miles AK, Drake K, Waters SC, Esque TC, Nussear, K. 2015. Integrating Gene Transcription-Based Biomarkers to Understand Desert Tortoise and Ecosystem Health. EcoHealth. DOI: 10.1007/s10393-014-0998-8 (pdf)

Soykan, CU., Lewison, RL. 2015. Using community-level metrics to monitor the effects of marine protected areas on biodiversity. Conservation Biology. DOI: 10.1111/cobi.12445 (pdf)

Lewison, R. L., Crowder, L. B., Wallace, B.P., Moore, J.E., Cox, T.M, Zydelis, R. , McDonald, S., DiMatteo, A., Dunn, D.C., Kot, C.., Bjorkland R. H, Kelez, S., Soykan, S., Stewart, K.R., Sims, M., Boustany, A., Read, A. J., Halpin, P. N., Nichols, W.J. , Safina, C. 2014. Global patterns of marine mammal, seabird, and sea turtle bycatch reveal taxa-specific and cumulative megafauna hotspots, Proceedings of the National Academy of Sciences, doi: 10.1073/pnas.131896011. (pdf)
Press coverage at:

Hinderle D, Lewison RL, Walde A, Deutschman D, Boarman W. 2014. The effects of homing and movement behaviors on translocation: desert tortoises in the Western Mojave Desert. Journal of Wildlife Management,79(1):137–147; 2015; DOI: 10.1002/jwmg.823 (pdf)

Briscoe, D. K., Hiatt, S., Hines, E., Lewison, R.L. 2014. Modeling habitat and bycatch risk for dugongs in Sabah, Malaysia. Endangered Species Research, 24: 237–247. (pdf)

Rochman, C. M., Lewison, R. L., Eriksen, M., Allend, H., Cook, A-M., Teh, S.J. Teh. 2014. Polybrominated diphenyl ethers (PBDEs) in fish tissue may be an indicator of plastic contamination in marine habitats. Science of the Total Environment, 476–477:622–633. (pdf)

Hobday, A. J., S. M. Maxwell, J. Forgie, J. McDonald, M. Darby, K. Seto, H. Bailey, S. J. Bograd, D. K. Briscoe, D. P. Costa, L. B. Crowder, D. C. Dunn, P. N. Halpin, J. R. Hartog, E. L. Hazen, B. G. Lascelles, R. L. Lewison and G. Poulos (in press). Dynamic ocean management: Integrating scientific and technological capacity with law, policy and management. Stanford Environmental Law Journal, in press.

Moore, J.E., Curtis, K. A., Lewison, R. L., Dillingham, P.W., Copes, J.M. et al. 2013. Evaluating sustainability of fisheries bycatch mortality for marine megafauna: a review of conservation reference points for data-limited populations. Environmental Conservation, doi:10.1017/S037689291300012X. (pdf)

Wallace, B.P., Kot, C. Y., DiMatteo, A.D., Lee, T., Crowder, L. B., Lewison, R. L. 2013. Impacts of fisheries bycatch on marine turtle populations worldwide: toward conservation and research priorities. Ecosphere, 4(3). (pdf)
Lewison, R.L. 2013. Finding the missing pieces: working to solve the fisheries bycatch puzzle. Animal Conservation, 16 153–154. (pdf)

Micheli F., Halpern BS, Walbridge S, Ciriaco S, Ferretti F, Fraschetti S, Lewison, Lewison, R. L. Nykjaer L, Rosenber, AR. 2013. Cumulative Human Impacts on Mediterranean and Black Sea Marine Ecosystems: Assessing Current Pressures and Opportunitie, PlosOne, DOI: 10.1371/journal.pone.0079889 (pdf)

MacDonald, B. D., Madrak, S. V., Lewison, R. L., Seminoff, J. A., Eguchi. T. 2013. Fine scale diel movement of the east Pacific green turtle, Chelonia mydas, in a highly urbanized foraging environment. Journal of Experimental Marine Biology and Ecology 443, 56–64. (pdf)

Lemons, G.E. , Eguchi, T., Lyon, B.N., Leroux, R., Seminoff, J.A. 2012. Effects fo blood anticoagulants on stable isotope values of sea turtle blood tissue. Aquatic Biology. 14:201-206. (pdf)

Drake KK, Nussear KE, Esque TC, Barber AM, Vittum KA, Medica PA, Tracy CR, Hunter Jr KW (2012). Does translocation influence physiological stress in the desert tortoise? Animal Conservation 15:560-750. 

Drake KK, Medica PA, Esque TC, Nussear KE (2012) Gopherus Agassizii (Agassiz’s Desert Tortoise) scute dysessysis/sloughing. Herpetological Review 43(3):473-474. 

LeBlac AM, Drake KK, Williams KL, Frick MG, Wobbles T, Rostal DC (2012) Nest temperatures and hatchling sex ratios from loggerhead sea turtle nests incubated under natural field conditions in Georgia, United States. Chelonian Conservation and Biology 11(1):108-116. 
Gaos, A.R., Lewison, R.L., Wallace, B., Yañez, I.L., Liles, M., Baquero, A., & J.A. Seminoff. 2012. Dive behaviour of adult hawksbills (Eretmochelys imbricata, Linnaeus 1766) in the eastern Pacific Ocean highlights shallow depth-use by the species. Journal of Experimental Marine Biology and Ecology. 432-433: 171-178. (pdf)

MacDonald, Bradley D. , Lewison. R.L., Madrak, S.V, Seminoff, J.A., Eguchi,T. 2012. Home ranges of East Pacific green turtles Chelonia mydas in a highly urbanized temperate foraging ground. Marine Ecology Progress Series. 461: 211–221. (pdf)

Lewison R.L., Oro D, Godley B, Underhill L, Bearhop S, Wilson RP, Ainley D, Arcos JM, Boersma PD, Borboroglu PG, Boulinier T, Frederiksen M, Genovart M, González-Solís J, Green JA, Grémillet D, Hamer KC, Hilton GM, Hyrenbach KD, Martínez-Abraín A, Montevecchi WA, Phillips RA, Ryan PG, Sagar P, Sydeman WJ, Wanless S, Watanuki Y, Weimerskirch H, Yorio P. 2012. Research priorities for seabirds: improving conservation and management in the 21st century. Endangered Species Research: 17:93-121. (pdf)

Gaos, A.R., Lewison, R.L., Wallace, B., Yañez, I.L., Liles, M., Nichols, W.J., Baquero, A., Hasbún, C.R., Vasquez, M.J., Urteaga, J. & J.A. Seminoff. 2012. Spatial ecology of critically endangered hawksbill turtles Eretmochelys imbricata: implications for management and conservation. Marine Ecology Progress Series. 450: 181–194. (pdf)

Gaos, A.R., Lewison, R.L., Liles, M., Nichols, W.J., Baquero, A., Hasbún, C.R., Vasquez, M.J., Urteaga, J. & J.A. Seminoff. 2011. Shifting the life-history paradigm: discovery of novel habitat use by hawksbill turtles. Biology Letters DOI:10.1098/rsbl.2011.0603. (pdf)
Press coverage at,0,5895787.story

Finkbeiner, E.M., Wallace B.P, Moore J.E., Lewison R.L., Crowder L.B.,Read, A.J. 2011. Cumulative estimates of sea turtle bycatch and mortality in USA fisheries between 1990 and 2007. Biological Conservation. (pdf)

Lovich, J.E., Enne, J.R. Madrak, S., Meyer, K., Loughran, C., Bjurlin, C., Arundell, T., Turner, W., Jones, C., Groenendall, G. 2011. Effects of wind energy production on growth, demography, and survivorship of a desert tortoise(gopherus agassizii) population in southern California with comparisons to natural populations.Herpetological Conservation and Biology 6(2):161-174. (pdf)

Lemons, G. , Lewison, R.L,Komoroske,L.M., Gaos, A., Lai, C.,Dutton, P.H., Eguchi, T.,LeRoux, R., Seminoff,J.A. 2011. Trophic ecology of green sea turtles in a highly urbanized bay: Insights from stable isotopes and mixing models. Journal of Experimental Marine Biology and Ecology 405 (2011) 25–32. (pdf)

Komoroske, L.M., Lewison, R.L, Seminoff, J.A., Deutschman, D.D., Deheyn, D.D. 2012. Trace metals in an urbanized estuarine sea turtle food web. Science of the Total Environment, 417: 108-116 (pdf)

Komoroske, L.M., Lewison, R.L, Seminoff, J.A., Deheyn, D.D, Dutton, P.H. 2011. Pollutants and the health of green sea turtles resident to an urbanized estuary in San Diego, CA. Chemosphere, 84 :5, 544-552. (pdf)

Lewison, R.L., Soykan, C.U., Cox, T., Peckham, H., Pilcher, N., LeBoeuf, N., McDonald, S. Moore, J.E., Safina, C., Crowder, L.B. 2011. Ingredients for addressing the challenges of fisheries bycatch. Bulletin of Marine Science. 87(2): 235-250. doi:10.5343/bms.2010.1062. (pdf)

Zydelis, R. Lewison, R. L., Shaffer, S A., Moore, J.E., Boustany5, A., Roberts. J.J., Sims, M., Dunn, D. C., Best, B, D. , Tremblay, Y., Kappes, M. A., Halpin, P. N., Costa, D. P, Crowder, L. B. 2010. Dynamic habitat models: using telemetry data to project fisheries bycatch. Proc. R. Soc. B (00), 1–10. (pdf)

Drost, C.A., Lovich, J.E., Madrak, S.V., and Monatesti, A.J., 2011, Removal of nonnative slider turtles (Trachemys scripta) and effects on native Sonora mud turtles (Kinosternon sonoriense) at Montezuma Well, Yavapai County, Arizona: U.S. Geological Survey Open-File Report 2010–1177, 48 p. (pdf)

Cartamil, D., Santana-Morales, O., Escobedo-Olvera M., Kacev, D., Castillo-Genix, L., Graham, J.B., Rubin, R.D., Sosa-Nisizaki, O. 2011. The artisanal elasmobranch fishery of the Pacific coast of Baja California, Mexico. Fisheries Research 108(2011): 393-403. (pdf)

Stewart, K. R., Lewison R. L., Dunn, D.C., Bjorkland R. H, Kelez, S., Halpin, P. N., Crowder, L.B. 2010.Characterizing Fishing Effort and Spatial Extent of Coastal Fisheries. PloSOne. e14451 (pdf)
Press release at

Gaos, A.R., Abreu, A., Alfaro, J.A., Amorocho, D., Arauz, R., Baquero, A., Briseño, R., Chacón, D., Dueñas, C., Hasbún, C., Liles, M., Mariona, G., Muccio, C., Muñoz, J.P., Nichols, W.J., Seminoff, J.A., Vásquez, M., Urteaga, J., Wallace, B., Yañez, I.L., and P. Zárate (2010). Signs of hope in the eastern Pacific: international collaboration reveals encouraging status for the severely depleted population of hawksbill turtles (Eretmochelys imbricata). Oryx, 44, pp 595-601 doi:10.1017/S0030605310000773. (pdf)
Press coverage at

Hamann M, Godfrey MH, Seminoff JA, Arthur K, Barata PCR, Bjorndal KA, Bolten AB, Broderick AC, Campbell LM, Carreras C, Casale P, Chaloupka M, Chan SKF, Coyne MS, Crowder LB, Diez CE, Dutton PH, Epperly SP, FitzSimmons NN, Formia A, Girondot M, Hays GC, Cheng IS, Kaska Y, Lewison R, Mortimer JA, Nichols WJ, Reina RD, Shanker K, Spotila JR, Tomás J, Wallace BP, Work TM, Zbinden J, Godley BJ. 2010. Global research priorities for sea turtles: informing management and conservation in the 21st century, Endangered Species Research, 11:245-269. (pdf)

Cartamil, D., Wegner, N.C., Kacev, D., Ben-Aderet, N., Kohin, S. Graham, J.B. 2010. Movement patterns and nursery habitat of juvenile thresher sharks Alopias vulpinus in the Southern California Bight. Marine Ecology Progress Series 404:249-258. (pdf)

Hoffman, M., Hilton-Taylor, C. ,Angulo, A., Bohm, M., Brooks, T.M., Butchart, S.H.M, Carpenter, K. E., Chanson, J., et al. 2010. The impact of conservation on the status of the world’s vertebrates. Science, DOI: 10.1126/science.1194442.COVER STORY IN CONSERVATION LETTERS 3(3). (pdf)

Wallace, B.W., Lewison, R. L., McDonald, S., McDonald, T., Kot, C. Y., Kelez Sara, S., Bjorkland, R.K., Finkbeiner, E.M., Helmbrecht, S., and L. B. Crowder. 2010. Global patterns of fisheries bycatch of marine turtles: implications for research and conservation. Conservation Letters,doi: 10.1111/j.1755-263X.2010.00105.x. (pdf)

Esque TC, Nussear KE, Drake KK, Walde AD, Berry KH, Averill-Murray RC, Woodman AP, Boarman WI, Medica PA, Mack J, Heaton JS (2010) Effects of subsidized predators, resource variability, and human population density on desert tortoise populations in the Mojave Desert, USA. Endangered Species Research 12:167-177.

Moore, J.E., Cox, T.M, Lewison R.L. , Read A.J., Bjorkland R., McDonald, S.L. , Crowder L.B., Aruna, E. , Ayissi, I. , Espeut, P., Joynson-Hicks, C. , Pilcher, N., Poonian, C., Solarin, B., and J. Kiszka. 2010. An interview-based approach to assess marine mammal and sea turtle captures in artisanal fisheries. Biological Conservation, 143, 795–805. (pdf)

Dunn, D.C., K. Stewart, R. Bjorkland, M. Haughton, S. Singh-Renton, R. L. Lewison, L. Thorne and P.N. Halpin. A regional analysis of coastal fishing effort in the wider Caribbean. Fisheries Research, doi:10.1016/j.fishres.2009.10.010. (pdf)

Lewison, R.L., C. Soykan, J. Franklin. 2009. Mapping the bycatch seascape: multispecies and multi-scale spatial patterns of fisheries bycatch. Ecological Applications,19(4), 920–930. (pdf)

Moore, J.E., B.P. Wallace, R.L. Lewison, R. Žydelis, T.M. Cox, and L.B. Crowder. 2008. A review of marine mammal,sea turtle, and seabird bycatch in USA fisheries and the role of policy in shaping management. Marine Policy doi:10.1016/j.marpol.2008.09.003. (pdf)

Soykan, C.U., J.E. Moore, R. Žydelis, L.B. Crowder, C. Safina, and R.L. Lewison. 2008. Why Study Bycatch? Endangered Species Research 5: 91–102. doi: 10.3354/esr00175. (pdf)

Lewison, R., S. Hooker, D. Hodgson, D. Agnew, D. Oro, C. Tisdell, H. Marsh, R. Wilson, B. Godley, S. Cooke, A. Cunningham, J. Matthiopoulos, C. Hammer, J. Seminoff (eds.). 2008. Fisheries bycatch: problems and solutions, ESR Theme Section. Endangered Species Research 5 (2-3). (pdf)

Schipper, J, Chanson, J.S., Chiozza, F., Cox, N.A., Hoffmann, M. et al. 2008. The status of the world’s land and marine mammals: diversity, threat, and knowledge. Science, 322, 225-230. (pdf)

Wallace, B. P., S.S. Heppell, R. L. Lewison and S. Kelez. 2008. Using reproductive value analyses to assess relative impacts of fisheries bycatch on loggerhead turtle populations worldwide. Journal of Applied Ecology 45(4), 1076-1085. (pdf)

Sims, M., T.C. Cox and R. L. Lewison. 2008. Modeling spatial patterns in fisheries bycatch: Improving bycatch maps to aid fisheries management. Ecological Applications 18(3), 649-661. (pdf)

Nussear KE, Esque TE, Heaton JS, Cablk ME, Drake KK, Valentin C, Yee JL, Medica PA (2008) Are wildlife detector dogs or people better at finding desert tortoises (Gophers agassizii)? Herpetological Conservation and Biology 3(1):103-115.

Finkelstein, M., V. Bakker, D.F. Doak, B. Sullivan, R. L. Lewison, W. Satterthwaite, P.B. McIntyre, S. Wolfe, D. Priddel, J.M. Arnold, R.W. Henry, P. Sievert, J. Croxall. 2008. Evaluating the potential effectiveness of compensatory mitigation strategies for marine bycatch. PLOSOne, 3(6): e2480. (pdf)

Cerling, T.E., J. M. Harris , J. A. Hart, P. Kaleme, H. Klingel, M. G. Leakey, N. E. Levin, R. L. Lewison, B. H. Passey. 2008. Stable isotope ecology of the common hippopotamus. Journal of Zoology, DOI: 10.1111/j.1469-7998.2008.00450.x (pdf)

McClusky, S. M. and R. L. Lewison. 2008. Quantifying Fishing Effort: A synthesis of current methods and their applications. Fish and Fisheries 9, 188–200. (pdf)

Doak D. , V. Bakker, V, M. Finkelstein, B. Sullivan, R. L. Lewison, B. Keitt, J. Arnold, J. Croxall, F. Micheli, M. Sanjayan. 2007. Compensatory mitigation for marine bycatch will do harm, not good. Frontiers in Ecology and the Environment 5, 350-351. (pdf)

Cox, T.M., R.L. Lewison, R. Zydelis, L.B. Crowder, C. Safina, A.J. Read. 2007. Comparing Effectiveness of Experimental and Implemented Bycatch Reduction Measures: the Ideal and the Real. Conservation Biology 21:1155–1164. (pdf)

Lewison, R. L. and L. B. Crowder 2007. Putting longline bycatch of sea turtles into perspective. Conservation Biology 21: 79-86. (pdf)

Lewison, R. L. 2007. Population responses to environmental and human-mediated disturbances: Assessing the vulnerability of the common hippopotamus (Hippopotamus amphibius). African Journal of Ecology 5: 407-415. (pdf)

Lewison, R. L., D. Nel, F. Taylor, J.P. Croxall and K. Rivera. 2005. Thinking big—taking a large-scale approach to seabird bycatch. Marine Ornithology 33: 1–5. (pdf)

Lewison, R. L., L. B. Crowder , A. Read, and S. Freeman. 2004. Understanding impacts of fisheries bycatch on marine megafauna. Trends in Ecology and Evolution, 19 (11): 598-604. (pdf)

Lewison, R. L., L. B. Crowder and S. Freeman. 2004. Quantifying the effects of fisheries on threatened species: the impact of pelagic longlines on loggerhead and leatherback sea turtles. Ecology Letters, 7: 221-231. COVER STORY IN ECOLOGY LETTERS 7(3). (pdf)

Lewison, R. L and J. Carter. 2004. Exploring foraging behavior of an unusual megaherbivore: A spatially explicit model of the hippopotamus. Ecological Modelling, 171: 127-138. (pdf)

Lewison, R. L and L.B. Crowder. 2003. Estimating fishery bycatch and effects on a vulnerable seabird population. Ecological Applications, 13: 743-753. (pdf)

Lewison, R.L., L.B. Crowder, and D.J. Shaver. 2003. The impact of Turtle Excluder Devices and fisheries closures on loggerhead and Kemp’s ridley strandings in the western Gulf of Mexico. Conservation Biology, 17:1089-1097. (pdf)

Corey Clatterbuck (Ph.D.)

M.S. Biological Sciences, San Jose State University (2014); B.A. Biology & Anthropology, Transylvania University (2008)

Research Interests: Conservation ecology, movement ecology, ecotoxicology, animal behavior

Dissertation topic: Biomonitoring of legacy and emerging toxicants in Pacific coasts and ocean.


Tracy Grimes (M.S.)

B.S. Biology, San Diego State University (2011)

Research Interests: Conservation ecology, spatial ecology, trophic dynamics, foraging ecology, fisheries-marine mammal interactions

Thesis topic: Assessing the effects of Southern sea otter predation on a Dungeness crab population