Predation on gray whales and prolonged feeding on submerged carcasses by transient killer whales at Unimak Island, Alaska

Predation on gray whales and prolonged feeding on submerged carcasses by transient killer whales at Unimak Island, Alaska

ABSTRACT: As apex predators, killer whalesOrcinus orcaare expected to strongly influence the structure of marine communities by impacting the abundance, distribution, behavior, and evolution of their prey. Empirical assessments of these impacts are difficult, however, because killer whales are spars...

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Bibliographische Detailangaben
Veröffentlicht in:Marine Ecology Progress Series. - Inter-Research, 1979. - 421(2011) vom: Jan., Seite 229-241
1. Verfasser: Barrett-Lennard, Lance G. (VerfasserIn)
Weitere Verfasser: Matkin, Craig O., Durban, John W., Saulitis, Eva L., Ellifrit, David
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2011
Zugriff auf das übergeordnete Werk:Marine Ecology Progress Series
Schlagworte:Foraging strategy Predatory behavior Prey catching Scavenger Killer whale Gray whale Brown bear Sleeper shark Biological sciences Behavioral sciences mehr... Physical sciences Applied sciences Business
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520 |a ABSTRACT: As apex predators, killer whalesOrcinus orcaare expected to strongly influence the structure of marine communities by impacting the abundance, distribution, behavior, and evolution of their prey. Empirical assessments of these impacts are difficult, however, because killer whales are sparsely distributed, highly mobile, and difficult to observe. We present a 4 yr time series of observations of foraging and feeding behavior of >150 transient killer whales that aggregate annually during the northbound migration of gray whales past Unimak Island, Alaska. Most predatory attacks were on gray whaleEschrichtius robustuscalves or yearlings and were quickly abandoned if calves were aggressively defended by their mothers. Attacks were conducted by groups of 3 to 4 killer whales, which attempted to drown their prey. Gray whales generally tried to move into shallow water along the shoreline when attacked; if they succeeded in reaching depths of 3 m or less, attacks were abandoned. Kills occurred in waters from 15 to 75 m deep or were moved into such areas after death. After some hours of feeding, the carcasses were usually left, but were re-visited and fed on by killer whales over several days. Carcasses or pieces of prey that floated onshore were actively consumed by brown bearsUrsus arctos, and carcasses on the bottom were fed on by sleeper sharksSomniosus pacificus, apparently increasing the local density of both species. 
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700 1 |a Durban, John W.  |e verfasserin  |4 aut 
700 1 |a Saulitis, Eva L.  |e verfasserin  |4 aut 
700 1 |a Ellifrit, David  |e verfasserin  |4 aut 
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