Isotopic niches reveal the trophic structure of the cetacean community in the oceanic waters around the Azores oleh Myriam Lebon, Ana Colaço, Rui Prieto, Irma Cascão, Cláudia Oliveira, Marta Tobeña, Yann Planque, Yann Planque, Jérôme Spitz, Jérôme Spitz, Mónica A. Silva