Activity affects intraspecific body-size scaling of metabolic rate in ectothermic animals |
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Authors: | Douglas Stewart Glazier |
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Institution: | (1) Department of Biology, Juniata College, Huntingdon, PA 16652, USA |
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Abstract: | Metabolic rate is commonly thought to scale with body mass (M) to the 3/4 power. However, the metabolic scaling exponent (b) may vary with activity state, as has been shown chiefly for interspecific relationships. Here I use a meta-analysis of literature
data to test whether b changes with activity level within species of ectothermic animals. Data for 19 species show that b is usually higher during active exercise (mean ± 95% confidence limits = 0.918 ± 0.038) than during rest (0.768 ± 0.069).
This significant upward shift in b to near 1 is consistent with the metabolic level boundaries hypothesis, which predicts that maximal metabolic rate during
exercise should be chiefly influenced by volume-related muscular power production (scaling as M
1). This dependence of b on activity level does not appear to be a simple temperature effect because body temperature in ectotherms changes very little
during exercise. |
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