Abstract
After exposure to cool temperatures, ectotherms may increase (compensation), decrease (inverse acclimation), or show no change in standard metabolic rate (SMR). I tested whether these responses may be adaptations to seasonality in temperature with the following hypotheses: (1) winter-active Sceloporus occidentalis from southern California would show compensation to counteract the depressing effects of cool temperatures, whereas (2) winter-dormant S. occidentalis from Washington would show inverse acclimation to conserve energy, and (3) S. variabilis from tropical Costa Rica would not acclimate. Repeated measurements of SMR at 10, 16, and 35 C of these lizards after exposure to warm and cool conditions supported these predictions. Washington lizards in autumn exhibited inverse acclimation at low test temperatures: SMR decreased by 19% at 10 C and 9% at 16 C when lizards were transferred from simulated summer to simulated autumn conditions. Spring animals showed inverse acclimation only at 35 C. The Califor...
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