AI Article Synopsis
- Seasonal changes in resting metabolic rate (RMR) are influenced more by food availability than by temperature, based on a study of the African striped mouse.
- Researchers conducted 603 RMR measurements on 277 mice in varying seasonal conditions, tracking how RMR responded to changes in food supply and temperature.
- The findings suggest that, even in a subtropical environment, increased food availability leads to higher RMR, supporting the idea that food is a key driver of metabolic changes across seasons.
Article Abstract
Resting metabolic rate (RMR) influences energy allocation to survival, growth, and reproduction, and significant seasonal changes in RMR have been reported. According to one hypothesis, seasonal changes in RMR are mainly attributable to seasonal changes in ambient temperature (T) and food availability. Studies on species from the temperate zone indicated that food availability is the main driver. However, whether this is generally true is unknown, because studies from the tropics and subtropics, where most species live, are rare. We studied the African striped mouse (Rhabdomys pumilio) inhabiting a seasonal environment with hot dry seasons with low food availability and cold moist seasons with high food availability. Using 603 RMR measurements of 277 individuals, we investigated the relative importance of food availability and T on RMR during selected periods, in which one extrinsic factor varied while the other factor was relatively constant. At similar T, residual RMR increased with increasing levels of food availability. In contrast, different T did not influence residual RMR at similar levels of food availability. Thus, our study on a subtropical species gives support to the hypothesis, derived from temperate zone species, that food availability mainly drives seasonal changes in RMR.
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| http://dx.doi.org/10.1086/696828 | DOI Listing |
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