Trade-offs between activity and thermoregulation in a small carnivore, the least weasel Mustela nivalis
作者： K. Zub , P.A. Szafrańska , M. Konarzewski , P. Redman , J.R. Speakman
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摘要: We studied factors influencing daily energy expenditures (DEE) of male least weasels (Mustela nivalis) using the doubly labelled water technique. The relationship between ambient temperature and DEE formed a triangular pattern, characterized by invariance maximum an inverse minimum temperature. A simple energetic model relating to activity time (AT) predicted that, across seasons, less than 10 per cent measurements approach upper bound observed DEE. Male were able maintain relatively constant output varying temperatures adjusting their AT changes in They achieved winter due high thermoregulatory costs, spring summer levels physical activity. This pattern exemplifies ‘metabolic niche’ small mammal having extremely primarily driven
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