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Antarctic Ecosystem Research

Environmental Research

Operations, Management and Information

Contact Information:

Southwest Fisheries Science Center
8901 La Jolla Shores Drive
La Jolla, CA 92037-1508
Phone: (858) 546-7000
Fax: (858) 546-7003

Division Locations

La Jolla, CA
Santa Cruz, CA
Pacific Grove, CA

Field Stations

Antarctic Peninsula
Arcata, CA
Granite Canyon, CA
Piedras Blancas, CA

Tim Gerrodette

Protected Resources Division

Contact Information:

Phone: (858) 546-7131
Fax: (858) 546-7003
E-mail: Tim.Gerrodette@noaa.gov

Programs:

ETP Cetacean Assessment

Research Interests:

My main scientific interests are in the assessment, management and conservation of marine life. A central part of assessment is a well-designed monitoring program that is able to detect changes in abundance over time. There is often a great deal of uncertainty associated with such assessments, and an important task of wise management is to manage effectively and conservatively in the face of this uncertainty. The Precautionary Principle gives guidance about how to manage in the face of uncertainty.

Education:

BA, Biology, Carleton College, 1968.
PhD in Biological Oceanography, Scripps Institution of Oceanography, University of California at San Diego, 1979. Thesis title: Ecological studies of two temperate solitary corals.

Selected Publications:

Gerrodette, T., R. Olson, S. Reilly, G. Watters, and W. Perrin. 2012. Ecological metrics of biomass removed by three methods of purse-seine fishing for tunas in the eastern tropical Pacific Ocean. Conservation Biology, 26(2): 248–256.
Gerrodette, Tim. 2011. Inference without significance: measuring support for hypotheses rather than rejecting them. Marine Ecology. 32: 404-418.
Gerrodette, T. and T. Eguchi. 2011. Precautionary design of a marine protected area based on a habitat model. Endang Species Res. 15: 159–166.
Gerrodette, T., and L. Rojas-Bracho. 2011. Estimating the success of protected areas for the vaquita, Phocoena sinus. Marine Mammal Science. 27: E101-E125.
Gerrodette, T., B. L. Taylor, R. Swift, S. Rankin, A. Jaramillo L, and L. Rojas-Bracho. 2011. A combined visual and acoustic estimate of 2008 abundance, and change in abundance since 1997, for the vaquita, Phocoena sinus. Marine Mammal Science. 27: E79-E100.
Kaschner, K., D. Tittensor, J. Ready, T. Gerrodette and B. Worm. 2011. Current and future patterns of global marine mammal biodiversity. PLoS ONE 6(5): e19653.
Archer, F., J. Redfern, T. Gerrodette, S. Chivers and W. Perrin. 2010. Estimation of relative exposure of dolphins to fishery activity. Marine Ecology Progress Series. 410: 245-255.
Schwarz, Lisa K., T. Gerrodette and F. I. Archer. 2010. Comparison of closing and passing mode from a line-transect survey of delphinids in the eastern tropical Pacific Ocean. J. Cetacean Res. Manage. 11(3): 253-265.
Gerrodette, T., B. L. Taylor, R. Swift, S. Rankin, A. Jaramillo L and L. Rojas-Bracho. 2010. A combined visual and acoustic estimate of 2008 abundance, and change in abundance since 1997, for the vaquita, Phocoena sinus. Marine Mammal Science in press.
Eguchi, T., and T. Gerrodette. 2009. A Bayesian approach to line-transect analysis for estimating abundance. Ecological Modelling 220:1620-1630.
Gerrodette, T. 2009. The tuna-dolphin issue. Pages 1192-1195 in W. F. Perrin, B. Würsig, and J. G. M. Thewissen, editors. Encyclopedia of Marine Mammals, Edition edition. Academic Press, Burlington, Massachusetts.
Cramer, K., W. Perryman, and T. Gerrodette. 2008. Declines in reproductive output in two dolphin populations depleted by the yellowfin tuna purse-seine fishery. Marine Ecology Progress Series 369: 273-285.
Kane, E. A., P. A. Olson, T. Gerrodette, and P. C. Fiedler. 2008. Prevalence of the commensal barnacle Xenobalanus globicipitis on cetacean species in the eastern tropical Pacific Ocean, and a review of global occurrence. Fishery Bulletin 106:395-404.
Gerrodette, T., G. Watters, W. Perryman, and L. Ballance. 2008. Estimates of 2006 dolphin abundance in the eastern tropical Pacific, with revised estimates from 1986-2003. NOAA Technical Memorandum-NMFS-SWFSC 422, 39 p.
Redfern, J. V., J. Barlow, L. T. Ballance, T. Gerrodette, and E. A. Becker. 2008. Absence of scale dependence in dolphin-habitat models for the eastern tropical Pacific Ocean. Marine Ecology Progress Series 363:1-14.
Gerrodette, T. 2007. How to save oceanic life: a review of Marine Conservation Biology by Elliott A. Norse and Larry B. Crowder. BioScience 57:536-537.
Eguchi, T., T. Gerrodette, R. L. Pitman, J. A. Seminoff, and P. H. Dutton. 2007. At-sea density and abundance estimates of the olive ridley turtle (Lepidochelys olivacea) in the Eastern Tropical Pacific. Endangered Species Research.
Wade, P. R., G. M. Watters, T. Gerrodette, and S. B. Reilly. 2007. Depletion of spotted and spinner dolphins in the eastern tropical Pacific: modeling hypotheses for their lack of recovery. Marine Ecology Progress Series 343:1-14.
Taylor, B. L., M. Martinez, T. Gerrodette, J. Barlow, and Y. N. Hrovat. 2007. Lessons from monitoring trends in abundance of marine mammals. Marine Mammal Science 23:157-175.
Gerrodette, T., and J. Forcada. 2005. Non-recovery of two spotted and spinner dolphin populations in the eastern tropical Pacific Ocean. Marine Ecology Progress Series 291:1-21.
Archer, F., T. Gerrodette, S. Chivers, and A. Jackson. 2004. Annual estimates of the unobserved incidental kill of pantropical spotted dolphin (Stenella attenuata attenuata) calves in the tuna purse-seine fishery of the eastern tropical Pacific. Fishery Bulletin 102: 233-244.
Kinzey, D. and T. Gerrodette. 2003. Distance measurements using binoculars from ships at sea: accuracy, precision and effects of refraction. Journal of Cetacean Research and Management 5: 159-171.
Gerrodette, T., P. K. Dayton, S. Macinko, and M. J. Fogarty. 2002. Precautionary management of marine fisheries: moving beyond burden of proof. Bulletin of Marine Science 70: 657-668.
Barlow, J., T. Gerrodette and J. Forcada. 2001. Factors affecting perpendicular sighting distances on shipboard line-transect surveys for cetaceans. Journal of Cetacean Research and Management 3: 201-212.
Jaramillo-Legorreta, A. M., L. Rojas-Bracho and T. Gerrodette. 1999. A new abundance estimate for vaquitas: first step for recovery. Marine Mammal Science 15: 957-973.
Gerrodette, T., L. A. Fleischer, H. Pérez-Cortés and B. Villa Ramírez. 1995. Distribution of the vaquita, Phocoena sinus, based on sightings from systematic surveys. Pages 273-281 in Biology of the Phocoenids. A. Bjorge and G. P. Donovan, eds. Cambridge, International Whaling Commission.
Taylor, B. L. and T. Gerrodette. 1993. The uses of statistical power in conservation biology: the vaquita and northern spotted owl. Conservation Biology 7: 489-500.
Gerrodette, T. and W. G. Gilmartin. 1990. Demographic consequences of changed pupping and hauling sites of the Hawaiian monk seal. Conservation Biology 4: 423-430.
Gerrodette, T. and D. P. DeMaster. 1990. Quantitative determination of optimum sustainable population level. Marine Mammal Science 6: 1-16.
Gerrodette, T. 1987. A power analysis for detecting trends. Ecology 68: 1364-1372.
Gerrodette, T. 1981. Dispersal of the solitary coral Balanophyllia elegans by demersal planular larvae. Ecology 62:611-619.
Gerrodette, T. 1979. Equatorial submergence in a solitary coral, Balanophyllia elegans, and the critical life stage excluding the species from shallow water in the south. Marine Ecology Progress Series 1:227-235.

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