FournierThomas1999

Référence

Fournier, F., Thomas, D.W. (1999) Thermoregulation and repeatability of oxygen-consumption measurements in winter-acclimatized North American porcupines (Erethizon dorsatum). Canadian Journal of Zoology, 77(2):194-202.

Résumé

We measured the thermoregulatory responses of 13 North American porcupines (Erethizon dorsatum) to low ambient temperatures during respirometry trials in both air and a helium-oxygen gas mixture (helox). The objective was to quantify the energy metabolism of porcupines under varying ambient temperatures. The basal metabolic rate of our winter-acclimatized porcupines was higher than expected for animals of their body size, whereas thermal conductance was lower than allometric predictions. The increase in metabolic rate that we observed at -20°C was ca. 2 x BMR, although this was not the animals' maximum thermogenic capacity. The mean increase in thermal conductance for individuals placed in a helox atmosphere over that measured in an oxygen atmosphere was 1.91 and this represented a metabolic rate of ca. 3 x BMR at -20°C. We also determined that the repeatability of oxygen-consumption measurements below thermoneautrality were highly repeatable over medium-length time intervals (mean = 11 days) for both absolute and residual values.

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@ARTICLE { FournierThomas1999,
    AUTHOR = { Fournier, F. and Thomas, D.W. },
    TITLE = { Thermoregulation and repeatability of oxygen-consumption measurements in winter-acclimatized North American porcupines (Erethizon dorsatum) },
    JOURNAL = { Canadian Journal of Zoology },
    YEAR = { 1999 },
    VOLUME = { 77 },
    PAGES = { 194-202 },
    NUMBER = { 2 },
    NOTE = { 00084301 (ISSN) Cited By (since 1996): 6 Export Date: 26 April 2007 Source: Scopus CODEN: CJZOA Language of Original Document: English Correspondence Address: Fournier, F.; Department of Wildlife Ecology; 226 Russell Laboratories; University of Wisconsin; 1630 Linden Drive Madison, WI 53706-1598, United States References: Aschoff, J., Pohl, H., Rhythmic variation in energy metabolism (1970) Fed. Proc., 29, pp. 1541-1552; Bakken, G.S., Arboreal perch properties and the operative temperature experienced by small mammals (1989) Ecology, 70, pp. 922-930; Bennett, A.F., Inter-individual variability: An under-utilized resource (1987) New Directions in Ecological Physiology, pp. 147-169. , Edited by M.E. Feder, A.F. Bennett, W.R. Burggren, and R.B. Huey. Cambridge University Press, Cambridge; Berteaux, D., Thomas, D.W., Bergeron, J.-M., Lapierre, H., Repeatability of daily field metabolic rate in female meadow voles (Microtus pennsylvanicus) (1996) Funct. 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    ABSTRACT = { We measured the thermoregulatory responses of 13 North American porcupines (Erethizon dorsatum) to low ambient temperatures during respirometry trials in both air and a helium-oxygen gas mixture (helox). The objective was to quantify the energy metabolism of porcupines under varying ambient temperatures. The basal metabolic rate of our winter-acclimatized porcupines was higher than expected for animals of their body size, whereas thermal conductance was lower than allometric predictions. The increase in metabolic rate that we observed at -20°C was ca. 2 x BMR, although this was not the animals' maximum thermogenic capacity. The mean increase in thermal conductance for individuals placed in a helox atmosphere over that measured in an oxygen atmosphere was 1.91 and this represented a metabolic rate of ca. 3 x BMR at -20°C. We also determined that the repeatability of oxygen-consumption measurements below thermoneautrality were highly repeatable over medium-length time intervals (mean = 11 days) for both absolute and residual values. },
    KEYWORDS = { low temperature oxygen consumption rodent thermoregulation North America Erethizon dorsatum },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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