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Beaver Habitat Use and Impact in Truckee River Basin, California

Paul Beier and Reginald H. Barrett
The Journal of Wildlife Management
Vol. 51, No. 4 (Oct., 1987), pp. 794-799
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3801743
Stable URL: http://www.jstor.org/stable/3801743
Page Count: 6
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Beaver Habitat Use and Impact in Truckee River Basin, California
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Abstract

Stepwise logistic regression was used to identify factors important for habitat use by beavers (Castor canadensis) on streams. Increasing stream width and depth and decreasing gradient had the strongest positive effects on habitat use; food availability variables added little explanatory power. Some abandoned colony sites appeared to have been located on physically unsuitable habitat, whereas others appeared to be physically suitable sites abandoned due to resource depletion. The fact that few unused or uncolonized reaches were misclassified as suitable habitat suggests that suitable habitat has been saturated. Impact of beaver on woody plants was assessed for 8 forage species. Local extinction of quaking aspen (Populus tremuloides) and black cottonwood (P. trichocarpa) occurred on 4-5% of stream reaches. Willow (Salix spp.) showed good vigor despite heavy use in most reaches.

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