San Diego State University Department of Biology
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Genetic structure of leopard shark (Triakis semifasciata) populations in California waters (funded by PADI Project AWARE Foundation; SDSU Master's Program in Ecology)    


Eric Lewallen's thesis project -- 

Because elasmobranchs produce few well-developed young that do not undergo planktonic dispersal, genetic differentiation among local populations of these cartilaginous fishes along the West Coast is likely. Eric Lewallen collected tissue samples from leopard sharks at several sites, ranging  from Humboldt Bay to San Diego Bay, California. Analyses of these samples through mitochondrial and nuclear genomes and using ISSRs (inter simple sequence repeats) showed a pattern of isolation by distance across the species range in California, which appears most pronounced in Humboldt Bay. No evidence was found for philopatry in leopard sharks, but data suggest that the population structure of leopard sharks may be related to breeding site proximity. These results may be useful in the management of leopard shark populations. 

This page was last modified on May 10, 2012.  

SDSU Fish Ecology Lab

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