Mortality Rates of Beaver in Newfoundland

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Abstract
Mortality rates of beaver (C. canadensis) were studied in Newfoundland from 1964-1965 to 1970-1971. The average annual mortality rate was 27%, but was 52% during the first 6 mo. of life, 4% between 0.5 and 1.5 yr, and 40% between 1.5 and 2.5 yr. The survival rate was constant from 4.5-10.5 yr. Average annual adult (2.5 yr and older) mortality was 32%. Annual harvest mortality for sustained-yield management varied from 8-29%. Adult harvest mortality varied from 11-36% and natural mortality from 0-24%. 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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