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Northern Sea Lion Distribution and Abundance: 1956-80

Thomas R. Loughlin, David J. Rugh and Clifford H. Fiscus
The Journal of Wildlife Management
Vol. 48, No. 3 (Jul., 1984), pp. 729-740
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3801420
Stable URL: http://www.jstor.org/stable/3801420
Page Count: 12
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Northern Sea Lion Distribution and Abundance: 1956-80
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Abstract

The present distribution and abundance of the northern sea lion (Eumetopias jubatus) was determined from surveys made between 1975 and 1980 and compared to estimates made approximately 20 years earlier. The previous population estimate of 240,000-300,000 is similar to our estimate of 245,000-290,000. Declines appear to have occurred in the eastern Aleutian Islands, Pribilof Islands, and near Kodiak Island in the Gulf of Alaska. Increases may have occurred principally in the western and central Aleutians and west of Kodiak Island. Seasonal movements and indirect and direct effects by humans are considered the likely causes for regional changes in distribution and abundance.

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