Foraging characteristics of female northern fur seals (Callorhinus ursinus) and California sea lions (Zalophus californianus)
作者： George A. Antonelis , Brent S. Stewart , Wayne F. Perryman
DOI: 10.1139/Z90-022
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摘要: The foraging characteristics of northern fur seals (Callorhinus ursinus) and California sea lions (Zalophus californianus) from San Miguel Island, California, were studied during the 1985 summer breeding season. A radio transmitter was attached to 25 postpartum females each species used determine their locations at frequency duration feeding trips. Northern usually foraged in oceanic zone where mean water depth 933 m (n = 12). principally found neritic zone, averaged 323 m (n = 9). Most (92%) northwest whereas commonly (55%) or areas south (22%) island. Although both evidently similar distances island, trips over twice as long those . Fur ashore less time than between Analysis scats revealed ...
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