Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

Careau, Vincent, Reale, Denis, Garant, Dany, Pelletier, Fanie, Speakman, John R. and Humphries, Murray M. 2013, Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks, Journal of experimental biology, vol. 216, pp. 418-426, doi: 10.1242/jeb.076794.

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Title Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks
Author(s) Careau, Vincent
Reale, Denis
Garant, Dany
Pelletier, Fanie
Speakman, John R.
Humphries, Murray M.
Journal name Journal of experimental biology
Volume number 216
Start page 418
End page 426
Total pages 9
Publisher Company of Biologists
Place of publication Cambridge, England
Publication date 2013-02-01
ISSN 0022-0949
Keyword(s) basal metabolic rate
doubly labelled water
field metabolic rate
sustained metabolic scope
Summary Several empirical studies have shown that variation in daily energy expenditure (DEE) and resting metabolic rate (RMR) is influenced by environmental and individual factors, but whether these shared influences are responsible for, or independent of, relationships between DEE and RMR remains unknown. The objectives of this study were to (i) simultaneously evaluate the effects of environmental and individual variables on DEE and RMR in free-ranging eastern chipmunks (Tamias striatus) and (ii) quantify the correlation between DEE and RMR before and after controlling for common sources of variation. We found that the influence of individual factors on DEE and RMR is most often shared, whereas the influence of environmental factors tends to be distinct. Both raw and mass-adjusted DEE and RMR were significantly correlated, but this correlation vanished after accounting for the shared effect of reproduction on both traits. However, within reproductive individuals, DEE and RMR remained positively correlated after accounting for all other significant covariates. The ratio of DEE to RMR was significantly higher during reproduction than at other times of the year and was negatively correlated with ambient temperature. DEE and RMR appear to be inherently correlated during reproduction, but this correlation does not persist during other, less energy-demanding periods of the annual cycle.
Language eng
DOI 10.1242/jeb.076794
Field of Research 060208 Terrestrial Ecology
060308 Life Histories
060806 Animal Physiological Ecology
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2013, Company of Biologists
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