BerteauxThomas1999

Référence

Berteaux, D. and Thomas, D.W. (1999) Seasonal and interindividual variation in field water metabolism of female meadow voles Microtus pennsylvanicus. Physiological and Biochemical Zoology, 72(5):545-554.

Résumé

We analyzed variations in water flux rates on a large sample of meadow voles (Microtus pennsylvanicus) to quantify the effect of season on water metabolism of individuals and to examine patterns of intra- and interindividual variability. Voles were nonreproductive females maintained in outdoor enclosures where they fed on natural vegetation. They were injected one to three times with doubly labeled water, which resulted in one to six measures of daily water flux rate per individual. Summer water flux rates of voles were 258% of the predicted values for herbivorous eutherian mammals of similar size. To date, very few studies have focused on mammals with such high water flux rates. Body water volume of individuals was higher in summer than in winter (75.6% vs. 72.5%), and water flux rate of animals was 12.5% higher in the winter season (0.99 vs. 0.88 mL H2O g-1 d-1). Between-season differences in water fluxes were proportional to differences in energy expenditures, hence the water economy index remained constant across seasons (0.30 mL H2O kJ-1). Intraindividual variability of water flux rate was high compared to interindividual variability (repeatability, r<0.30), which will make it difficult to study natural selection of water metabolism in a microevolutionary framework, at least in meadow voles.

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@ARTICLE { BerteauxThomas1999,
    AUTHOR = { Berteaux, D. and Thomas, D.W. },
    TITLE = { Seasonal and interindividual variation in field water metabolism of female meadow voles Microtus pennsylvanicus },
    JOURNAL = { Physiological and Biochemical Zoology },
    YEAR = { 1999 },
    VOLUME = { 72 },
    PAGES = { 545-554 },
    NUMBER = { 5 },
    NOTE = { 15222152 (ISSN) Cited By (since 1996): 4 Export Date: 26 April 2007 Source: Scopus CODEN: PBZOF doi: 10.1086/316694 Language of Original Document: English Correspondence Address: Berteaux, D.; Dept. of Natural Resource Sciences; McGill University; Macdonald Campus; 111 Lakeshore Ste-Anne-de-Bellevue, Que. H9X 3V9, Canada; email: d.berteaux@nrs.mcgill.ca Chemicals/CAS: deuterium oxide, 11105-15-0, 13587-54-7, 7789-20-0; Deuterium Oxide, 7789-20-0 References: Bakken, G.S., Measurement and application of operative and standard operative temperatures in ecology (1992) Am Zool, 32, pp. 194-216; Bennett, A.F., Interindividual variability: An underutilized resource (1987) New Directions in Ecological Physiology, pp. 147-166. , M.E. Feder, A.F. Bennett, W.W. Burggren, and R.B. Huey, eds., Cambridge University Press, Cambridge; Bergeron, J.-M., Brunet, R., Jodoin, L., Is space management of female meadow voles (Microtus pennsylvanicus) related to nutritive quality of plants? 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    ABSTRACT = { We analyzed variations in water flux rates on a large sample of meadow voles (Microtus pennsylvanicus) to quantify the effect of season on water metabolism of individuals and to examine patterns of intra- and interindividual variability. Voles were nonreproductive females maintained in outdoor enclosures where they fed on natural vegetation. They were injected one to three times with doubly labeled water, which resulted in one to six measures of daily water flux rate per individual. Summer water flux rates of voles were 258% of the predicted values for herbivorous eutherian mammals of similar size. To date, very few studies have focused on mammals with such high water flux rates. Body water volume of individuals was higher in summer than in winter (75.6% vs. 72.5%), and water flux rate of animals was 12.5% higher in the winter season (0.99 vs. 0.88 mL H2O g-1 d-1). Between-season differences in water fluxes were proportional to differences in energy expenditures, hence the water economy index remained constant across seasons (0.30 mL H2O kJ-1). Intraindividual variability of water flux rate was high compared to interindividual variability (repeatability, r<0.30), which will make it difficult to study natural selection of water metabolism in a microevolutionary framework, at least in meadow voles. },
    KEYWORDS = { Microtus pennsylvanicus },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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