Phylogenetic grouping, curvature and metabolic scaling in terrestrial invertebrates
Ehnes, Roswitha B.; Rall, Bjoern C.; Brose, Ulrich
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 degrees 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.
Body mass; curvature; invertebrate; metabolic rate; MTE; phylogenetic group; polynomial; respiration; temperature
2011, Volume: 14, number: 10, pages: 993-1000-1000
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