BEECHING, Simon C.; RYAN, Wendy L.; SCHOFIELD, David; ANSWINI, Albert; Marine Science Consortium; Marine Science Consortium; Marine Science Consortium; Marine Science Consortium: Group size, group composition, and behavioral correlates in bottlenose dolphins (Tursiops truncatus) near Chincoteague Inlet, Virginia, USA

The behavioral biology of bottlenose dolphins is characterized by a complex of stereo-typed behavior performed within a dynamic social environment. To explore the relationship between group size and composition, ecological parameters, and behavior, we collected and analyzed observations of bottlenose dolphin (Tursiops truncatus) groups as part of an ongoing study. Free-ranging T. truncatus were observed between 1998 and 2000 in the Chincoteague Inlet region of Virginia, USA. The occurrence of nine stereotypical activities was recorded, along with group size, group composition, weather and ocean conditions. Both group size and composition were correlated with dolphin behavior. Several activities occurred significantly more often in larger groups, and in groups containing neonates. Analysis reveals a seasonal pattern of bottlenose dolphin activity near Chincoteague Inlet, and suggests a social, communicative function for some dolphin activities.