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Mortality Rates of Beaver in Newfoundland
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Mortality Rates of Beaver in Newfoundland

著者: Neil F Payne
版本/格式: 文章 文章 : 英语
刊登在:The Journal of Wildlife Management, Jan., 1984, vol. 48, no. 1, p. 117-126
数据库:JSTOR
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文件类型: 文章
所有的著者/提供者: Neil F Payne
ISSN:0022-541X
OCLC号码: 479999468
语言注释: English
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摘要:

Mortality rates of beaver (Castor canadensis) were studied in Newfoundland from 1964-65 to 1970-71. The average annual mortality rate was 27%, but was 52% during the first 6 months of life, 4% between 0.5 and 1.5 years, and 40% between 1.5 and 2.5 years. The survival rate was constant from 4.5 to 10.5 years. Average annual adult (2.5 years and older) mortality was 32%. Annual harvest mortality for sustained-yield management varied from 8 to 29%. Adult harvest mortality varied from 11 to 36% and natural mortality from 0 to 24%. Some compensatory natural mortality probably operates in the absence of harvest mortality. An annual harvest of less than 20-25% from stationary beaver populations will result in economic loss to trappers when fur prices are high.

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