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Intraspecific Relationships between Resting and Activity Metabolism in Anuran Amphibians: Influence of Ecology and Behavior

The aerobic capacity model, as well as other models for the evolution of aerobic metabolism and the origin of endothermy, requires a mechanistic link between rates of resting and activity oxygen consumption (V̇o2 rest and V̇o2 act). The existence of such link is still controversial, but studies with anuran amphibians support a correlation between V̇o2 rest and V̇o2 act at both the intraspecific and interspecific levels. Because results at the intraspecific level are based only on a few species, we test for the generality of a link between these two metabolic variables in anurans by studying the intraspecific correlational patterns between mass‐independent V̇o2 rest and V̇o2 act in anurans. We focus on 21 Neotropical species from different geographical areas that include remarkable diversity in behavior and thermal ecology. Although uncorrelated, V̇o2 rest and V̇o2 act seem to be consistent among individuals. Diverse intraspecific phenotypic correlational trends were detected, indicating that the intraspecific relationships between V̇o2 rest and V̇o2 act might be very diverse in anurans. The three possible trends (positive, negative, and absent correlations) were observed and appeared to be predictable from ecological and behavioral variables that relate to evolutionary physiological shifts in anurans. Positive correlations between V̇o2 rest and V̇o2 act were more common in species with active lifestyles (e.g., intense vocal activity) and in species that call at low temperatures (e.g., winter or high‐elevation specialists).