Oxygen Consumption during Resting, Calling, and Nest Building in the Frog Physalaemus Pustulosus

Abstract

Males (mean mass 1.7 g) called and amplexing pairs built foam nests in respirometer chambers. Mean oxygen consumption ($\dot{V}_{O_{2}}$) of resting males during the day was 0.26 ml h⁻¹, and at night it was 0.53 ml h⁻¹. Mean $\dot{V}_{O_{2}}$ of males that could hear other males calling but that were not themselves calling was 0.70 ml h⁻¹. Mean $\dot{V}_{O_{2}}$ of calling males was 1.13 ml h⁻¹. The energy cost per call (whine) decreases as whine rate increases. Mean $\dot{V}_{O_{2}}$ per frog during nest building was 2.03 ml h⁻¹. The individual energy cost incurred by male and female during nest building could not be separated. The data on oxygen consumption during sustained calling and nest building offer an opportunity for measuring voluntarily sustained elevated levels of aerobic metabolism in anurans. During calling and nest building mean aerobic metabolic scope was 1.23 and 1.67 ml h⁻¹, respectively. The corresponding factorial scope of about 5.7 is within the range of published values for anurans u...