RBMO 46(3): 463-469 | 2011
Research Note

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Records of Risso's dolphin, Grampus griseus, in coastal waters of southern Argentina

Luciana Riccialdelli^1,2*, Mónica A. Torres², R. Natalie P. Goodall^1,2, Natalia A. Dellabianca^1,2, Lida E. Pimper^2,3, Laura M. Reyes⁴, Alejandro Fernández-Ajó⁴ & Ricardo Bastida⁵

¹Centro Austral de Investigaciones Científicas (CADIC), Bernardo Houssay 200, Ushuaia (9410), Tierra del Fuego, Argentina 

²Museo Acatushún de Aves y Mamíferos Marinos Australes, Sarmiento 44, Ushuaia (9410), Tierra del Fuego, Argentina

³Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Capital Federal (1427), Argentina

⁴Universidad Nacional de la Patagonia San Juan Bosco, Blvd. Brown 3050, Puerto Madryn (9120), Chubut, Argentina

⁵Universidad Nacional de Mar del Plata, Complejo Universitario, Peña y Funes, Mar del Plata (7600), Argentina

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We review the records of published and unpublished sightings and strandings for Risso's dolphin (Grampus griseus) in subantarctic waters of the Southwestern South Atlantic Ocean. Based on 59 sighting (n= 521 individuals) and 33 stranding records (n= 88 individuals), we identified three main areas of Risso's dolphin concentration in Patagonian waters, which have been observed mostly during the austral summer. We were unable to find published or unpublished reports of Risso's dolphin in offshore or over deep-water areas in this region. Future studies covering other potential areas of the species' distribution are important to improve the scarce information known for this dolphin in this area. 

Key words: Stranding, sightings, Southwestern South Atlantic Ocean 

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