Journal Article10.1111/J.1748-7692.2007.00103.X
Assessing killer whale predation on steller sea lions from field observations in kenai fjords, alaska
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TL;DR: The behavioral and predatory patterns of Gulf of Alaska (GOA) transient killer whales (Orcinus orca) were studied between 2000 and 2005 using remote video and vessel-based observations near the Chiswell Island Steller sea lion rookery and in the broader Kenai Fjords (KF) region of the northern GOA as mentioned in this paper.
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Abstract: The behavioral and predatory patterns of Gulf of Alaska (GOA) transient killer whales (Orcinus orca) were studied between 2000 and 2005 using remote video and vessel-based observations near the Chiswell Island Steller sea lion (Eumetopias jubatus) rookery and in the broader Kenai Fjords (KF) region of the northern GOA. GOA transient killer whales were observed on 118 d over the 6-yr period; the median group size was two (range: 1‐9). Nine predation events were observed from vessels and an additional sixteen were inferred from remote video studies; all involved Steller sea lions. Estimates from field observations suggest that fifty-nine sea lions were consumed over the summer seasons of 2002‐2005; whereas estimates based on published caloric requirements of transient killer whales would suggest a loss of 103 sea lions over the same time period. GOA transients spent a large proportion (43%) of their time resting which may be a strategy for conserving energy. Predation
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Craig O. Matkin,E. Saulitis,Graeme M. Ellis,P. Olesiuk,S. Rice +4 more
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Ongoing population-level impacts on killer whales Orcinus orca following the 'Exxon Valdez' oil spill in Prince William Sound, Alaska
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TL;DR: The existence of strikingly divergent prey preferences of resident and transient killer whales is revealed, which are reflected in distinctive foraging strategies and related sociobiological traits of these sympatric populations.
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