Distribution of Risso's dolphin (Grampus griseus, Cuvier 1812) in Chilean waters

Abstract

Resumen.-En este trabajo se revisa la información del calderón gris Grampus griseus en aguas chilenas. En base al análisis de 44 registros, la distribución a lo largo de la costa chilena parece ser continua entre los 20º13' S y 40º S, sugiriendo que los registros más australes en Chile (~52ºS) podrían corresponder a calderones grises provenientes del Océano Atlántico. Los registros en Chile muestran un aumento durante el verano austral e indican una preferencia por aguas sobre los 1000 m de profundidad. Varamientos masivos, interacciones con pesquerías y asociaciones con otras especies de cetáceos son también revisadas. Palabras clave: Calderón gris, Grampus griseus, distribución,

Isotopic assessment of prey and habitat preferences of a cetacean community in the southwestern South Atlantic Ocean

“…3). Both groups (GG1 and GG2) likely inhabit the continental shelf-slope break in the southwestern South Atlantic, which contrasts with other studies that report G. griseus occupying deep water and oceanic habitats (Olavarría et al 2001, Davis et al 2002. There are no dietary data based on stomach contents of this species off southernmost South America, but off South Africa, G. griseus primarily forages on cephalopods (Sekiguchi et al 1992).…”

“…Risso's dolphin: Grampus griseus is found worldwide in temperate and tropical offshore oceanic waters (Baumgartner 1997, Olavarría et al 2001) but only recently in the subantarctic (Goodall & Schiavini 1992). This species is considered a deep sea squid consumer.…”

“…Food records from New Zealand, Chile, and the South Shetland Islands included fish and squid (Torres & Aguayo 1979, Baker 1981, Van Waerebeek & Oporto 1990). Risso's dolphin: Grampus griseus is found worldwide in temperate and tropical offshore oceanic waters (Baumgartner 1997, Olavarría et al 2001) but only recently in the subantarctic (Goodall & Schiavini 1992). This species is considered a deep sea squid consumer.…”

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

“…Due to the lack of dedicated offshore studies we were unable to find any reports of sightings in offshore and deep waters and in the slope edge area of Argentina (Bastida & Lichtschein 1984, Lovrich 20104 , Van Waerebeek et al 2010, as is the case for other regions such as Chile, the Azores Archipelago, Gulf of Mexico and the Mediterranean Sea (Baumgartner 1997, Olavarría et al 2001, Cañadas et al 2002, Pereira 2008, Bearzi et al 2010. The lack of records for this species around the Falkland (Malvinas) Islands might be due to the insufficient data available for most species of marine mammal in the area (Otley et al 2008).…”

First mass stranding of Risso's dolphins ( Grampus griseus) in Peru and its destiny as food and bait

“…The few previous records of Risso's dolphins from Peru Sánchez & Arias-Schreiber, 1998;Kinzey et al, , 2001 and Chile (Findlay et al, 1998;Olavara et al, 2001;Hückstädt, 2005) suggest an almost continuous distribution in the south-east Pacific, from the Equator to central Chile, but with an apparent gap of 1000 km between central Peru and northern Chile, although limited survey efforts have been carried out in this area. The southernmost Peruvian record was an incidentally caught individual landed in Pisco (13844 0 S 76813 0 W; Tenicela, 1994), while the northernmost Chilean record was a sighting located at 20813 0 S 70838 0 W, 27 nautical miles off Iquique (Findlay et al, 1998).…”