EFFECTS OF PLIO-PLEISTOCENE EXTINCTION IN NORTH CAROLINA ON MOLLUSCAN TROPHIC ECOLOGY: A PROGRESS REPORT
Our previous results (Kelley et al. 2009) for the Lumber River and Old Dock localities indicated that most measures of trophic structure did not change significantly between the Duplin and the lower Waccamaw. The addition of the Natural Well and Neuse River localities strengthens this interpretation; the percent of suspension feeding genera (43-53%) and suspension feeding individuals (77-92%) was similar for the three formations. Suspension feeding bivalves represented 72-80 % of bivalve genera and 94-99% of Duplin, 95% of lower Waccamaw, and 81% of upper James City bivalve individuals. Predators constituted 24-36% of all genera for the three formations, and 5% of Duplin, 7% of lower Waccamaw, and 4% of upper James City individuals. Predatory gastropods included 61-70% of Duplin gastropod genera (28% of gastropod individuals), 68% of lower Waccamaw gastropod genera (42% of gastropod individuals), and 63% of upper James City gastropod genera (28% of gastropod individuals). Future work will examine samples from additional localities to test the robustness of the pattern.