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    Energetics of hibernation in the Arctic ground squirrel (Spermophilus parryii kenicotti)

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    Karpovich_S_2002.pdf
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    Author
    Karpovich, Shawna
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    URI
    http://hdl.handle.net/11122/6250
    Abstract
    Arctic ground squirrels (Spermophilus parryii kenicotti) hibernate underground; experiencing burrows temperatures of -5 to -25C̊. Hibernation consists of 7-9 months of torpor interrupted every 2-3 weeks by 10-20 h arousal episodes with high body temperatures and metabolic rates. Metabolic rates and body temperatures were measured during arousal episodes under temperate and arctic conditions. No difference in cost of arousal episodes was detected. Yet, when the cost of thermogenesis during torpor was included, proportional cost of arousal episodes decreased from 86 to 27% comparing temperate to arctic conditions. The relationship between metabolic rate and body temperature was examined during the recooling phase of hibernation. As animals entered torpor, body temperature was allowed to either decrease naturally or was experimentally altered at different points along the recooling curve. The changes in metabolic rate can be explained by changes in body temperature and no sign of temperature-independent metabolic suppression was detected.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2002
    Table of Contents
    Introduction -- Hibernation in Arctic ground squirrels -- Arousal episodes -- Recooling phase -- Ch. 1. Energetics of hibernation under Arctic conditions -- Ch. 2. Metabolic suppression during the recooling phase of hibernation in the Arctic ground squirrel -- Conclusions.
    Date
    2002-12
    Type
    Thesis
    Collections
    Biological Sciences

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