Meeting Abstract
Shark dispersal for the purposes of reproduction is generally poorly understood, including that of tiger sharks (Galeocerdo cuvier), a large, circumglobal, coastal-pelagic species. Learning more about the dispersal patterns of apex predators, like the tiger shark, will allow for greater understanding of the conservation measures needed to protect this species and those like it. To gain insight into the reproductive evolution of these sharks, we have collected G. cuvier tissue samples from eight sites across the Gulf of Mexico and West Atlantic. We use highly polymorphic microsatellite DNA fragment analysis to examine relatedness of individuals within and between ocean basins, and use assignment testing to identify potential distribution corridors and critical habitat. Based on dispersal patterns observed in other large coastal shark species, we hypothesize that there will be shallow structure between the different sample sites due to geographic, environmental, and reproductive barriers. We further hypothesize that this structure will be male-biased, reflecting the female philopatry and dependence on coastal nursery habitat.
