Killer Whales (Orcinus orca) of Patagonia, and Their Behavior of Intentional Stranding While Hunting Nearshore

López, Juan C. Alonso; López, Diana

doi:10.2307/1380981

Cited by 146 publications

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“…Indeed, there are reports of predation on southern sea lions by killer whales, specifically from Argentinean Patagonia, where killer whales strand themselves while attempting to take prey in shallow waters (Lopez and Lopez, 1985;Hoelzel, 1991). Killer whales have been reported from Pisagua (13º35'S) to the Bellinghausen Sea (70º23'S), including the Juan Fernandez Islands (Aguayo-Lobo et al, 1998) but the population size in Chilean waters is unknown.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Hückstädt¹,

Antezana²

2004

Sci. Mar.

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oportunistas que habita diversos ecosistemas de todo el mundo y cuya dieta varía en forma local y estacional, lo que se refleja en la diversidad de comportamientos alimentarios asociados con sus presas. En este trabajo, reportamos la presencia de orcas presumiblemente cazando lobos marinos comunes del sur, en asociación con la flota pesquera de jurel en Chile Central. Se registró la presencia de orcas en cuatro lances de pesca. Todos los avistamientos fueron de grupos compuestos por 3-5 individuos, hembras y crías. Si bien la presencia de orcas no afectó significativamente el número de lobos marinos, si tuvo un efecto en el comportamiento de los lobos marinos reduciendo el número de conductas, cesando las actividades de alimentación y descanso y permaneciendo cercanos al casco del barco pesquero hasta después de finalizada la recuperación de la red. Se propone que las orcas podrían estar utilizando la pesquería como una fuente indirecta de presas, beneficiándose así de la agregación de lobos marinos alrededor del barco pesquero, lejos de tierra.Palabras clave: Orcinus orca, orca, Otaria flavescens, lobo marino común del sur, pesquería de cerco, Chile central.

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Section: Introductionmentioning

confidence: 99%

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Hückstädt¹,

Antezana²

2004

Sci. Mar.

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“…comm.). Consequently, there is probably more than one killer whale pod along the coast of Argentina, and different pods may use different foraging tactics (López & López, 1985;Hoelzel, 1991;Iñíguez, 2001; present study).…”

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confidence: 70%

“…From long-term studies in northern Patagonia, Argentina, predatory behaviours of killer whales are well known, where they prey on South American sea lions, Otaria flavescens and southern elephant seals, Mirounga leonina (López & López, 1985;Hoelzel, 1991;Iñíguez, 2001). Occasional observations along the Patagonian coast of Argentina showed that killer whales also prey more rarely on dusky dolphins, Lagenorhynchus obscurus, southern right whales, Eubalaena australis, minke whales, Balaenoptera bonaerensis and sevengill sharks, Notorhynchus cepedianus (Würsig & Würsig, 1980;Thomas & Taber, 1984;Reyes & García-Borboroglu, 2004;E.A.…”

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confidence: 99%

“…The majority of the predatory behaviours of killer whales and anti-predatory behaviours of South American sea lions from Argentina are known from land-based observations (López & López, 1985;Hoelzel, 1991;Vila et al, 2008), but predator-prey behaviours of these species are poorly known at open waters off Argentina. Since it is difficult to obtain an accurate description of feeding events involving killer whales and sea lions at offshore areas, the availability of any source of information (such as video recordings, photographs, or testimonies) is often the only and the best way to document these interactions.…”

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confidence: 99%

“…The sex/age class of the sea lion was determined by body shape and colour (Crespo & Pedraza, 1991), and also established by its body size relative to the killer whales. Individual killer whales were identified by natural marks based on photo-Id catalogues from longterm observations conducted in northern Patagonia (López & López, 1985;Hoelzel, 1991;Iñíguez, 2001). …”

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confidence: 99%

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Killer whales attack on South American sea lion associated with a fishing vessel: predator and prey tactics

Grandi

Castro

Crespo

2012

lajar

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ABSTRACT.Interactions between killer whales and sea lions are widely known. This work describes the predator-prey behaviour of killer whales and South American sea lion associated with a trawling fishery. In Argentina the predatory behaviours of killer whales and anti-predatory behaviours of South American sea lions have been described from costal based observations, but predator-prey behaviour of these species is poorly known at open waters. Here we describe a killer whale group attack on an individual sea lion, using a video recorded from a trawling vessel and an interview of the ship captain. This predator-prey behaviour represents an example of the complexity of interactions between marine mammals and fisheries along the Patagonian coast. Keywords: Orcinus orca, Otaria flavescens, behaviour, trawling fishery, Patagonia. Ataque de orcas a un lobo marino sudamericano asociado a un barco pesquero:tácticas del predador y la presa RESUMEN. Las interacciones entre orcas y lobos marinos son ampliamente conocidas. Este trabajo describe el comportamiento predador-presa entre orcas y un lobo marino sudamericano asociados a un barco pesquero de arrastre. Particularmente en Argentina el comportamiento predatorio de las orcas y el anti-predatorio de los lobos marinos comunes fueron descriptos mediante observaciones costeras, pero se sabe poco sobre el comportamiento de estas especies en aguas abiertas. En este trabajo, a partir de un video grabado desde un barco de pesca arrastrero, junto con la entrevista del capitán del barco, se describe cómo un grupo de orcas ataca a un lobo marino Sudamericano. Este comportamiento predador-presa representa un ejemplo sobre la complejidad de las interacciones entre mamíferos marinos y las pesquerías a lo largo de la costa patagónica.

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Behavioural Ecology of Cetaceans

Boran¹,

Evans

Rosen³

2002

Marine Mammals

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Killer Whales (Orcinus orca) of Patagonia, and Their Behavior of Intentional Stranding While Hunting Nearshore

Cited by 146 publications

References 0 publications

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Behaviour of Southern sea lions in presence of killer whales during fishing operations in Central Chile

Killer whales attack on South American sea lion associated with a fishing vessel: predator and prey tactics

Behavioural Ecology of Cetaceans

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