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People

Publications

  1. Ahrens, R.N.M. and Devlin, R.H. Accepted. Background-genotype effects on transgenes in populations: A growth-enhanced salmon simulation.. Transgenic Research
  2. Carruthers, T. R., McAllister, M.K. and Ahrens, R.N.M. 2010. Simulating spatial dynamics to evaluate methods of deriving abundance indices for tropical tunas. Can. J. Fish. Aquat. Sci. 67:1409-1427
  3. Jensen, O.P., S. Ortega-Garcia, S.J.D. Martell, R.N.M. Ahrens, M.L. Domeier, C.J. Walters, and J.F. Kitchell 2010. Local management of a highly migratory species? The effects of longline closures and recreational catch-and-release for Baja California striped marlin fisheries. Progress in Oceanography 86:176-186
  4. Wittmer, H. U., Ahrens, R. N. M. and McLellan, B. N. 2010. Viability of mountain caribou in British Columbia, Canada: effects of habitat change and population density.. Biological Conservation 143(1):86-93
  5. Christensen, V., Walters, C.J., Ahrens, R., Alder, J., Buszowski, J., Christensen, L.B., Cheung, W.W.L., Dunne, J., Froese, R., Karpouzi, V., Kastner, K., Kearney, K., Lai, S., Lam, V., Palomares, M.L.D., Peters-Mason, A., Piroddi, C., Sarmiento, J.L., St 2009. Database-driven models of the world’s large marine ecosystems. Ecological Modelling 220: 1984-1996

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Robert Ahrens

PhD

Email:
Research area: Ecology
Supervisors: V. Christensen, C. Walters
History: M.Sc. UBC (Zoology)
Ph.D. UBC (Zoology)

Controversy regarding the population status and rates of decline of large pelagic predators inferred from industrial fisheries catch and effort data was the primary motivation behind my PhD work (http://hdl.handle.net/2429/21742). I chose to focus on three main question using the Japanese longline catch and effort data from 1950-2002. 1) Given the complex temporal and spatial dynamics of fishing fleets and target species, how should Japanese longline catch and effort data be treated when used to develop abundance trends? 2) What do such trends indicate about stock productivity and trajectory given current exploitation levels? 3) How could fishing effort be distributed globally to limit fishing mortality on vulnerable species while maintaining viable industrial fisheries?

In addition to pursuing a PhD I have taught, since 2001, courses in the Fisheries Centre and Zoology department related to principles of applied ecology, theoretical population dynamics, modeling, and stock assessment. I also maintain a keen interest in exploring exploitation by humans as a selective force and the population level consequences of such selection.

Starting January 2011, I will be joining the faculty at the University of Florida in the School of Forest and Resource Conservation within the Fisheries and Aquatic Sciences division. 7922 NW 71st St., Gainesville, FL 32653.

Last updated 2 October 2012