Duration of snow cover and its influence on life-history variation in yellow-bellied marmots

Authors: Van Vuren, D.; Armitage, K. B.

Year: 1991

Journal: Canadian Journal of Zoology, Vol. 69, pp. 1755-1758

Publisher: UNKNOWN

Keywords: INDIVIDUAL VARIATION, MAMMALOGY, MARMOT, RMBL, WINTER ECOLOGY

Abstract

We evaluated the relationship between growing-season phenology, as indicated by time of snow melt, and intrapopulation variation in reproduction and growth of yellow-bellied marmots. The time of snow melt explained significant proportions of the variation in frequency of reproduction (78%), litter size (79%), and estimated body mass of young of the year (68%), but not growth rate. We suggest that the duration of snow cover, through its effect on the length of the growing season, influences habitat quality; marmots living at localities with prolonged snow cover have a shorter season of access to food. The variation in life-history traits is attributed to phenotypic plasticity and not to local genetic variation.

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