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Past Principal Investigators
  • Myers, Ransom - in memoriam
  • Travis Dawson Shepherd
    Post-doctoral fellow
    Department of Biological Sciences
    Dalhousie University
    Halifax, N.S., Canada
    B3H 4R2
    Email: shepherd-replace-mscs.dal.ca
    Direct and indirect ecosystem effects due to commercial exploitation of marine fishes
    I am investigating direct and indirect ecosystem effects caused by the commercial exploitation of marine fishes. It is becoming common in fisheries science to consider ecosystem and community effects on harvested species in order to maximize yield and optimize management. However, there is often a lack of consideration of the ecosystem and community effects resulting from harvesting the same species. My work examines such effects in order to more fully understand coastal marine ecosystems and how commercial fisheries affect targeted and non-targeted species.


    Shepherd, T.D. et al. Northwest Atlantic Dusky Sharks Nearing Extinction. In prep (target - Current Biology).

    Myers, R.A., J.K. Baum, T.D. Shepherd, S.P. Powers, and C.H. Peterson. 2007. Cascading effects of the loss of apex predatory sharks from a coastal ocean. In press: Science.

    Shepherd, T.D. 2007. Draft COSEWIC Status Report on Smooth Skate, Malacoraja senta. Prepared for the Committee on the Status of Endangered Wildlife in Canada.

    O'Connell, M.T., T.D. Shepherd, A.M.U. O'Connell and R.A. Myers. Long-term declines in two apex predators, bull sharks (Carcharhinus leucas) and alligator gar (Atractosteus spatula), in Lake Pontchartrain, an oligohaline estuary in southeastern Louisiana. Submitted Dec 2006 to Estauries and Coasts.

    Shepherd, T.D. 2006. Draft COSEWIC Status Report on Thorny Skate, Amblyraja radiata. Prepared for the Committee on the Status of Endangered Wildlife in Canada.

    Trippel, E.A., T.D. Shepherd, S.C. Smith. 2006. Reduction of whale entanglements: Preliminary evaluation of neutrally buoyant groundline used in the Bay of Fundy lobster pot fishery. Prepared for WWF-Canada.

    Shepherd, T.D., R.K. Smedbol and M.K. Litvak. Allee effects determine the form of range size - abundance relationships. In prep (target - American Naturalist).

    Trippel, E.A., N.L. Holy and T.D. Shepherd. Barium sulphate modified fishing gear as a mitigative measure for cetacean incidental mortalities. In prep (target - Journal of Cetacean Research and Management).

    Shepherd, T.D., R.K. Smedbol, S. Gavaris, R.L. Stephenson and M.K. Litvak. Spatial Distribution as an Indicator of Extinction Vulnerability in Temperature Marine Fishes. In prep (target - Fish and Fisheries).

    Shepherd, T.D., R.K. Smedbol, S. Gavaris, M.K. Litvak and R.L. Stephenson. Quantitative estimators of range size in temperate marine fish. In prep (target - Fisheries Research).

    Shepherd, T.D. and R.A. Myers. 2005. Direct and indirect fishery effects on small coastal elasmobranchs in the northern Gulf of Mexico. Ecology Letters. Accepted June 2005. pdf

    Shepherd, T.D. and M.K. Litvak. 2004. Density-dependent habitat selection and the ideal free distribution in marine fish spatial dynamics: considerations and cautions. Fish and Fisheries. 5:141-152. pdf

    Trippel, E.A. and T.D. Shepherd. 2004. By-catch of harbour porpoise (Phocoena phocoena) in the lower Bay of Fundy gillnet fishery, 1998-2001. Canadian Technical Report of Fisheries and Aquatic Sciences. 2521. pdf

    Trippel, E.A, N.L. Holy, D.L. Palka, T.D. Shepherd, G.D. Melvin, and J.M. Terhune. 2003. Acoustic reflective net mesh reduces harbour porpoise by-catch. Marine Mammal Science. 19: 240-243.

    Shepherd, T., F. Page, and B. MacDonald. 2002. Length and sex-specific associations between spiny dogfish (Squalus acanthias) and hydrographic variables in the Bay of Fundy and Scotian Shelf. Fisheries Oceanography.11: 78-89. pdf

    Shepherd, T.D., K.C. Costain, and M.K. Litvak. 2000. The effect of development rate on the morphology, swimming, and escape response of larval American plaice. Marine Biology. 137: 737-745. pdf

    The Census of Marine Life is a growing global network of researchers in more than 45 nations engaged in a ten-year initiative to assess and explain the diversity, distribution, and abundance of marine life in oceans--past, present, and future.
    Last Updated: 2022-06-19