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COMMON BOTTLENOSE DOLPHIN (Tursiops truncatus truncatus) Northern South Carolina Estuarine System Stock

Common bottlenose dolphins are found in estuarine, coastal, continental shelf, and oceanic waters of the western North Atlantic (wNA). Distinct morphological forms have been identified in offshore and coastal waters of the wNA off the U.S. East Coast: a smaller morphotype present in estuarine, coastal, and shelf waters from Florida to approximately Long Island, New York, and a larger, more robust morphotype present further offshore in deeper waters of the continental shelf and slope (Mead and Potter 1995) from Florida to Canada. The two morphotypes also differ in parasite load and prey preferences (Mead and Potter 1995), and show significant genetic divergence at both mitochondrial and nuclear DNA markers (Hoelzel et al. 1998, Kingston and Rosel 2004, Kingston et al. 2009, Rosel et al. 2009). The level of genetic divergence is greater than that seen between some other dolphin species (Kingston and Rosel 2004, Kingston et al. 2009) suggesting the two morphotypes in the wNA may represent different subspecies or species. The larger morphotype makes up the wNA Offshore Stock of common bottlenose dolphins. Spatial distribution data (Kenney 1990, Garrison et al. 2017a), tag-telemetry studies (Garrison et al. 2017b), photoidentification (photo-ID) studies (e.g., Zolman 2002; Speakman et al. 2006; Stolen et al. 2007; Mazzoil et al. 2008), and genetic studies (Caldwell 2001, Rosel et al. 2009, Litz et al. 2012) indicate that the coastal morphotype comprises multiple, demographically independent stocks distributed in coastal and estuarine waters of the wNA. The Southern North Carolina Estuarine System Stock is one such stock.