HumphriesKramerThomas2003

Référence

Humphries, M.M., Kramer, D.L. and Thomas, D.W. (2003) The role of energy availability in mammalian hibernation: An experimental test in free-ranging eastern chipmunks. Physiological and Biochemical Zoology, 76(2):180-186.

Résumé

Reduced torpor expression by hibernating mammals is often attributed to physiological constraints that limit their hibernation ability but may instead reflect adaptive, plastic responses to surplus energy availability. We evaluated this hypothesis by supplementing the food hoards of free-ranging eastern chipmunks (Tamias striatus) before hibernation and then documenting their use of torpor during the subsequent winter. In both years of study, chipmunks that received additional food were euthermic more than twice as frequently as nonsupplemented individuals. Furthermore, when food-supplemented individuals did express torpor, their minimum collar temperature was 5°-10°C warmer than nonsupplemented animals. These results indicate that reduced torpor expression by hibernators can result from an absence of energetic necessity rather than a lack of physiological capability and suggest that even endotherms sequestered in a hibernaculum may benefit from maintaining an elevated body temperature whenever possible.

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@ARTICLE { HumphriesKramerThomas2003,
    AUTHOR = { Humphries, M.M. and Kramer, D.L. and Thomas, D.W. },
    TITLE = { The role of energy availability in mammalian hibernation: An experimental test in free-ranging eastern chipmunks },
    JOURNAL = { Physiological and Biochemical Zoology },
    YEAR = { 2003 },
    VOLUME = { 76 },
    PAGES = { 180-186 },
    NUMBER = { 2 },
    NOTE = { 15222152 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus CODEN: PBZOF Language of Original Document: English Correspondence Address: Humphries, M.M.; Dept. of Natural Resource Sciences; McGill University; Macdonald Campus; 21,111 Lakeshore Road Ste. Anne de Bellevue, Que. H9X 3V9, Canada; email: humphries@nrs.mcgill.ca References: Altmann, J., Observational study of behaviour: Sampling methods (1974) Behaviour, 49, pp. 227-267; Audet, D., Thomas, D.W., Evaluation of the accuracy of body temperature measurement using external radio transmitters (1996) Can J Zool, 74, pp. 1778-1781; Bennett, A.F., The evolution of activity capacity (1991) J Exp Biol, 160, pp. 1-23; Burton, R.S., Reichman, O.J., Does immune challenge affect torpor duration? 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Springer, Berlin; Harlow, H.J., Frank, C.L., The role of dietary fatty acids in the evolution of spontaneous and facultative hibernation patterns in prairie dogs (2001) J Comp Physiol B, 171, pp. 77-84; Harlow, H.J., Menkens, G.E., A comparison of hibernation in the black-tailed prairie dog, white-tailed prairie dog and Wyoming ground squirrel (1986) Can J Zool, 64, pp. 793-796; Heldmaier, G., Ruf, T., Body temperature and metabolic rate during natural hypothermia in endotherms (1992) J Comp Physiol B, 158, pp. 696-706; Humphries, M.M., Thomas, D.W., Hall, C.L., Speakman, J.R., Kramer, D.L., The energetics of autumn mast hoarding in eastern chipmunks (2002) Oecologia, 133, pp. 30-37; Humphries, M.M., Thomas, D.W., Kramer, D.L., Torpor and digestion in food-storing hibernators (2001) Physiol Biochem Zool, 74, pp. 283-292; The role of energy availability in mammalian hibernation: A cost-benefit approach (2003) Physiol Biochem Zool, 76; Ko?rtner, G., Geiser, F., Torpor and activity patterns in free-ranging sugar gliders Petaurus breviceps (Marsupialia) (2000) Oecologia, 123, pp. 350-357; Lyman, C.P., Willis, J.S., Malan, A., Wang, L.C.H., (1982) Hibernation and Torpor in Mammals and Birds, , Academic Press, New York; Maniero, G.D., The influence of temperature and season on mitogen-induced proliferation of ground squirrel lymphocytes (2000) Life in the Cold, pp. 493-503. , G. 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(1991) Am J Physiol, 260, pp. R1123-R1129; Composition of Foods: Raw, Processed, Prepared (1984) Agricultural Handbook, pp. 8-12. , Nut and Seed Products. Government Printing Office, Washington, D.C; Wang, L.C.H., Hudson, J.W., Temperature regulation in normothermic and hibernating eastern chipmunks, Tamias striatus (1971) Comp Biochem Physiol, 38 A, pp. 69-90; Waßmer, T., Wollnik, F., Timing of torpor bouts during hibernation in European hamsters (Cricetus cricetus L.) (1997) J Comp Physiol B, 167, pp. 270-279; Wrazen, J.A., Wrazen, L.A., Hoarding, body mass dynamics, and torpor as components of the survival strategy of the eastern chipmunk (1982) J Mammal, 63, pp. 63-72. },
    ABSTRACT = { Reduced torpor expression by hibernating mammals is often attributed to physiological constraints that limit their hibernation ability but may instead reflect adaptive, plastic responses to surplus energy availability. We evaluated this hypothesis by supplementing the food hoards of free-ranging eastern chipmunks (Tamias striatus) before hibernation and then documenting their use of torpor during the subsequent winter. In both years of study, chipmunks that received additional food were euthermic more than twice as frequently as nonsupplemented individuals. Furthermore, when food-supplemented individuals did express torpor, their minimum collar temperature was 5°-10°C warmer than nonsupplemented animals. These results indicate that reduced torpor expression by hibernators can result from an absence of energetic necessity rather than a lack of physiological capability and suggest that even endotherms sequestered in a hibernaculum may benefit from maintaining an elevated body temperature whenever possible. },
    KEYWORDS = { adaptation bioenergetics food availability food supplementation hibernation rodent torpor Tamias striatus },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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