Scientia Marina, Vol 70, No 3 (2006)

Diet of Risso's dolphin (Grampus griseus) in the western Mediterranean Sea


https://doi.org/10.3989/scimar.2006.70n3407

Carmen Blanco
Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Spain

Mª Ángeles Raduán
Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Spain

Juan Antonio Raga
Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Spain

Abstract


The diet of Risso’s dolphin in the Mediterranean is described based on 15 animals stranded between 40°25’N 00°32’W and 37°35’N 00°45’E from April 1987 to January 2003. The prey were mainly oceanic cephalopods. Pelagic octopods, especially A. argo, were the most abundant (mean = 41.28%; SD±34.32). Species belonging to the families Ommastrephidae, Histioteuthidae and Onychoteuthidae were also frequent components of its diet. The bathymetric distribution of cephalopods shows that Risso’s dolphin preferentially feeds on the middle slope (600 to 800 m depth) in the Mediterranean.


Keywords


Grampus griseus; cetacean; cephalopods; diet; slope; Mediterranean

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