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Reliability of Aerial Cache Surveys to Monitor Beaver Population Trends on Prairie Rivers in Montana
Jon E. Swenson, Stephen J. Knapp, Peter R. Martin and Thomas C. Hinz
The Journal of Wildlife Management
Vol. 47, No. 3 (Jul., 1983), pp. 697-703
Stable URL: http://www.jstor.org/stable/3808605
Page Count: 7
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An aerial cache survey was unreliable in indicating population size or trend of beaver (Castor canadensis) on 2 prairie rivers in Montana. Accuracy in locating caches was high (about 90%) and constant among years and areas, but colony size varied among areas and years. Data on age, sex, and reproduction are needed to determine colony size and properly evaluate aerial cache-survey results.
The Journal of Wildlife Management © 1983 Wiley