Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks. Careau, V., Réale, D., Garant, D., Pelletier, F., Speakman, J., R., & Humphries, M., M. Journal of Experimental Biology, 216(3):418-426, 2, 2013.
Website doi abstract bibtex 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. © 2013. Published by The Company of Biologists Ltd.
@article{
title = {Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks},
type = {article},
year = {2013},
keywords = {BMR,Basal metabolic rate,Doubly labelled water,Field metabolic rate,Sustained metabolic scope},
pages = {418-426},
volume = {216},
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abstract = {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. © 2013. Published by The Company of Biologists Ltd.},
bibtype = {article},
author = {Careau, Vincent and Réale, Denis and Garant, Dany and Pelletier, Fanie and Speakman, John R. and Humphries, Murray M.},
doi = {10.1242/jeb.076794},
journal = {Journal of Experimental Biology},
number = {3}
}
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