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Evolved Reductions in Body Temperature and the Metabolic Costs of Thermoregulation in Deer Mice Native to High Altitude by Oliver H. Wearing; Graham R. Scott is a Environmental Science article available to read on EtoBox.

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The evolution of endothermy was instrumental to the diversification of birds and mammals, but the energetic demands of maintaining high body temperature could offset the advantages of endothermy in some environments. We hypothesized that reductions in body temperature help high-altitude natives overcome the metabolic challenges of cold and hypoxia in their native environment. Deer mice ( Peromyscus maniculatus ) from high-altitude and low-altitude populations were bred in captivity to the second generation and were acclimated as adults to warm normoxia or cold hypoxia. Subcutaneous temperature ( T ~sub~ , used as a proxy for body temperature) and cardiovascular function were then measured throughout the diel cycle using biotelemetry. Cold hypoxia increased metabolic demands, as reflected by increased food consumption and heart rate (associated with reduced vagal tone). These increased metabolic demands were offset by plastic reductions in T ~sub~ (approx. 2°C) in response to cold hypoxia, and highlanders had lower T ~sub~ (approx. 1°C) than lowlanders in both environmental treatments. Empirical and theoretical evidence suggested that these reductions could together reduce metabolic

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Author

Oliver H. Wearing; Graham R. Scott

Publisher

The Royal Society

Published

2022

Language

EN

Field

Environmental Science (Life Sciences)