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Frohoff, T.G., Vail, C.S. and Bossley, M. (Eds.) 2005. Unpublished Book for the Workshop on Research and Management of Solitary, Sociable Odontocetes. 16th Biennial Conference on the Biology of Marine Mammals, San Diego, California, 10 December 2005.



Solitary, sociable dolphins & other odontocetes. Report from Workshop 2005.
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Many mammal populations include solitary indi-viduals. These individuals could be solitary for short or long periods and involve more or less spatial separation from conspecifics. Av ariety of accepted socio-ecology variables such as food availability, predator pressure, and reproductive strategies can account for much solitary behaviour. However, other factors, such as human interfer-ence, disease and the individual variability evident in many mammals may also be significant in some cases. The reasons dolphins become solitary are common to many mammalian species, but the response of some dolphins to the solitary state, including ar edirection of social responses to humans or other species, could be unique to the Delphinidae.
A resident wild dolphin is reported to avoid the discharge plume from the Red River which empties into the northern end of St Ives Bay. The river effluent is found to contain a high load of finely divided metalliferous particles rich in iron but also containing significant amounts of Sn, As, Cu and Zn. It is suggested that the echo-location system and/or chemosensory system of the dolphin may be affected by this discharge causing the animal to avoid the area of the effluent.