Larval dispersal and population connectivity in harvested species
A fundamental goal in the field of ecology is to develop hypotheses explaining the abundance and distribution of species. For marine organisms, this involves identifying the physical and biological factors influencing rates of larval exchange, or connectivity, among populations. Patterns of ocean circulation are clearly important, most attempts to relate patterns of population differentiation to ocean currents usually only consider mean ocean trajectories over very large spatial scales, potentially yielding unrealistically high expectations for long-distance larval transport.
Our lab has been involved with research focused on patterns of dispersal and connectivity in several harvested species, such lingcod (Ophiodon elongatus), scalloped hammerhead sharks (Sphyrna lewini), bay scallops (Argopecten irradians), and gooseneck barncles (Pollicipes elegans). These studies provide information about rates and patterns of genetic exchange among populations, as well as insight into recent changes in population size.
Nance, H.A., Klimley, P., Galvan-Magna, F., Martinez-Ortiz, J., & P. B. Marko. In Press. Demographic Processes Underlying Subtle Patterns of Population Structure in the Scalloped Hammerhead Shark, Sphyrna lewini. PLoS One 6: e21459. [PDF]
Hart, M. W. & P. B Marko. 2010. It’s about time: divergence, demography, and the evolution of developmental modes in marine invertebrates. Integrative and Comparative Biology 50:643-661. [PDF]
Nance, H.A., Daly-Engle, T.S., & P. B. Marko. 2009. New microsatellite loci for the endangered scalloped hammerhead shark, Sphyrna lewini. Molecular Ecology Resources 9: 955-957. [PDF]
Marko, P. B. & K. B. Barr. 2007. Basin-scale patterns of mtDNA differentiation and gene flow in the Bay Scallop, Argopecten irradians concentricus Say. Marine Ecology Progress Series 349: 139-150. [PDF]
Marko, P. B., Rogers-Bennett, L. & A. Dennis. 2007. Population structure and migration of lingcod (Ophiodon elongatus) inferred from mitochondrial DNA: limited dispersal of long-lived pelagic larvae? Marine Biology 150:1301-1311. [PDF]
Moran, A. L. & P. B. Marko. 2005. A simple technique for physical marking of marine bivalves. Journal of Shellfish Research 24: 567-572. [PDF]