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Population Status of River Otter in Western Oregon

James E. Tabor and Howard M. Wight
The Journal of Wildlife Management
Vol. 41, No. 4 (Oct., 1977), pp. 692-699
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3799991
Stable URL: http://www.jstor.org/stable/3799991
Page Count: 8
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Population Status of River Otter in Western Oregon
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Abstract

Population status of the river otter (Lutra canadensis) in western Oregon was evaluated by using structural population modeling. Survival and recruitment rates for the female segment of the population were estimated from the age structure of a sample of 113 female otters obtained from trappers during the 1970-71 and 1971-72 trapping seasons. Age was determined from cementum annuli in canine teeth. Annual survival rates were estimated to be 68, 46, and 73 percent for age-classes 0, 1, and 2-11, respectively. Recruitment was 1.14 female pups per adult female at the beginning of trapping season. Comparison of estimated survival and recruitment rates, by the modeling approach, revealed that the population was stationary.

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