Abstract

VELASQUEZ, JENNIFFER  and  GONZALEZ S, LUIS ALEJANDRO. Thermal Ecology and Activity Pattern Lizard Tropidurus hispidus(Sauria: Tropiduridae) in the East of Venezuela. Acta biol.Colomb. [online]. 2010, vol.15, n.2, pp.25-36. ISSN 0120-548X.

We studied aspects of thermal ecology and activity patterns in the lizard Tropidurus hispidus in a forest tropophic of Sucre State, Venezuela between June 2007 and May 2008. The body temperature was 35.68±1.4 °C from 32.6 to 37.80 °C. Females body temperature (Tb) in drought and rainfall was 34-38 ºC and 32-38 ºC, respectively. In males the range of body temperature (Tb) in drought was 35-37 °C and 34-35 °C. in rain. No relation was found between the air temperature (Ta) and substrate temperature (Ts). Thermoregulatory trend, indicate active thermoregulation in drought and rain. Dividing the activity into three time segments: morning, afternoon and evening and the pattern of activity was bimodal in drought and unimodal in rain. To relate the pattern of activity with environmental variables (air and substrate) using the Pearson correlation in drought was a negative correlation with air temperature (-0.780) and with the substrate (-0.65). Rain was not associated with the air temperature (-0.056) or the substrate (-0.040). The thermal niche breadth was calculated using the Levins index, we did not find significant differences between males and females in both periods and thermal niche overlap between sexes, obtained by the Pianka index was 0.81 in rain and 0.90 in drought.

Keywords : Lizard; Tropidurus hispidus; Thermoregulation; Activity; Venezuela.

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