Like all ectotherms, amphibians and reptiles obtain the temperature needed for their metabolic processes from the environment. Thermoregulation in lizards is very precise and involves both physiological and behavioral mechanisms. However, controlling body temperature entails some costs. The literature that discusses the determination and quantification of these costs is scarce. The present study intends to estimate costs of behavioral thermoregulation of twenty lizards of Tropidurus torquatus (Squamata, Tropiduridae) collected in Parque Continental, Sao Paulo, while seaking their preferential temperatures in laboratorial thermal gradients. It is assumed that lizards search for energy sources more actively whenexposed to low environmental temperatures, and that adding an extra mass to the animal would constrict locomotion increasing the effort and energy costs. Based on this, thermoregulation of each animal will be analyzed in three experimental conditions: 1) when thermal gradient is off, 2) when thermal gradient is on , and 3) when a thermal gradient is on and an extra mass is tied to the animal.
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