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Ehnes R.B.,Jf Blumenbach Institute Of Zoology And Anthropology | Rall B.C.,Jf Blumenbach Institute Of Zoology And Anthropology | Brose U.,Jf Blumenbach Institute Of Zoology And Anthropology
Ecology Letters | Year: 2011

For more than a century, the scaling of animal metabolic rates with individual body masses and environmental temperature has predominantly been described by power-law and exponential relationships respectively. Many theories have been proposed to explain these scaling relationships, but were challenged by empirically documented curvatures on double-logarithmic scales. In the present study, we present a novel data set comprising 3661 terrestrial (mainly soil) invertebrate respiration rates from 192 independent sources across a wide range in body masses, environmental temperatures and phylogenetic groups. Although our analyses documented power-law and exponential scaling with body masses and temperature, respectively, polynomial models identified curved deviations. Interestingly, complex scaling models accounting for phylogenetic groups were able to remove curvatures except for a negative curvature at the highest temperatures (>30°C) indicating metabolic down regulation. This might indicate that the tremendous differences in invertebrate body architectures, ecology and physiology may cause severely different metabolic scaling processes. © 2011 Blackwell Publishing Ltd/CNRS.

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