Analysis of 23 years of Risso’s dolphins photo-identification in the North-Western Mediterranean Sea, first results on movements and site fidelity

In the context of the 2010-2012 French Pelagos Sanctuary Research program, GECEM, in partnership with GIS3M and EcoOcéan Institut, conducted a study on the Risso’s dolphin (Grampus griseus) population in the North-Western Mediterranean Sea. This study allowed to collect new photo-ID data and to compare two photo-ID catalogues, managed by GECEM since 1989 and EcoOcéan Institut since 1994, with data collected during dedicated and opportunistic surveys, mainly in summer and autumn.