Social structure of Risso's dolphins (Grampus griseus) at the Azores: a stratified community based on highly associated social units.(Report)

Canadian Journal of Zoology | April 1, 2008| | Copyright

Abstract: In this study, we present for the first time a model for the social structure of Risso's dolphins (Grampus griseus Cuvier, 1812). Over the period 2004-2006, 1028 Risso's dolphins were identified at Pico island, Azores. Individuals sighted on 10 or more occasions were included in the analysis of social structure (n = 183). High resighting rates indicate strong site fidelity for at least part of the population. We found that individuals form stable, long-term bonds organised in pairs or in clusters of 3-12 individuals. Social structure is stratified based on age and ...

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