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Breeding Habits, Growth and Stomach Contents of the Steller Sea Lion in Alaska

Ole A. Mathisen, Robert T. Baade and Ronald J. Lopp
Journal of Mammalogy
Vol. 43, No. 4 (Nov., 1962), pp. 469-477
DOI: 10.2307/1376909
Stable URL: http://www.jstor.org/stable/1376909
Page Count: 9
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Breeding Habits, Growth and Stomach Contents of the Steller Sea Lion in Alaska
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Abstract

Steller sea lions (Eumetopias jubata) were observed from May to July. Harem boundaries were indistinct, and the size of a harem varied from day to day as did the number of unattached males near a harem. Copulation was observed from 31 May to 10 July, parturition from 24 May to 27 June. A cow nursed only her own pup or yearling. Harem groups slowly disbanded as pups learned to swim. Lengths of pups, yearlings, cows and bulls are summarized. Only noncommercial fishes, with the exception of one pink salmon, were found in 114 stomachs. Invertebrates were more frequent than fishes.

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