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Black Bear Predation on Beavers on an Island in Lake Superior
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Black Bear Predation on Beavers on an Island in Lake Superior

著者: Douglas W Smith; David R Trauba; Raymond K Anderson; Rolf O Peterson
版本/格式: 文章 文章 : 英语
刊登在:American Midland Naturalist, Oct., 1994, vol. 132, no. 2, p. 248-255
数据库:JSTOR
其它数据库: British Library Serials
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文件类型: 文章
所有的著者/提供者: Douglas W Smith; David R Trauba; Raymond K Anderson; Rolf O Peterson
ISSN:0003-0031
OCLC号码: 477464034
语言注释: English
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摘要:

Beavers (Castor canadensis) were studied on two Lake Superior islands; one (Stockton) had black bears (Ursus americanus), while the other (Outer) did not. Both islands were colonized by beavers during the late 1940s or early 1950s in the absence of bears, and bears immigrated to Stockton Island in the 1970s. Active beaver colonies on Outer Island increased during the study whereas they declined on Stockton Island. Bears ate five beavers in live-traps and disturbed twelve other sets. Six of 90 bear scats found had beaver hair in them, and 18 of 26 beaver lodges were dug into by bears. Compared to Outer Island, beavers on Stockton Island cut fewer food trees relative to their availability, and cut few trees >30 m from water, whereas beavers on Outer Island traveled >200 m inland to forage. Mainland studies have not reported such intense beaver/bear interactions, nor is the behavioral or population response of beavers as significant where they are preyed upon by wolves (Canis lupus), a more typical beaver predator.

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