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Temperature as a Modifying Factor in the Spring Pelage Change of Short-Tailed Weasels

Charles Chapin Rust
Journal of Mammalogy
Vol. 43, No. 3 (Aug., 1962), pp. 323-328
DOI: 10.2307/1376938
Stable URL: http://www.jstor.org/stable/1376938
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Temperature as a Modifying Factor in the Spring Pelage Change of Short-Tailed Weasels
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Abstract

Ten short-tailed weasels (Mustela erminea bangsi), in white pelage, were trapped in Taylor County, Wisconsin during November and December 1960. On 11 January 1961, the animals were divided into 2 groups of 5 animals each and placed in environmental rooms having artificial daylengths of 18 hours. Group I was exposed to a constant temperature of ca. 70°F; Group II was exposed to a constant temperature of ca. 20°F. All of the animals had molted into a brown pelage by 16 March 1961. The onset of the molt was delayed in the cold room; but once started, proceeded rapidly, the white winter pelage being completely replaced by brown as the molt progressed. As white hairs were shed in the warm room, brown hairs appeared, producing intermixed areas of brown and white.

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