CONICET | Buscador de Institutos y Recursos Humanos

Study the thermal extremes in O. occidentalis. We record the critical thermal maximum (CTmax) in dry season (DS) and wet season (WS). We correlate this parameter whit the climatic variables: temperature maxima of the day (TMD), temperature minimum of the day (TmD), and relative heliphany (Hr). In the Las Flores gully, was collected 25 toads (12 in the DS and 13 in the WS). We record in the field the body temperature (Tb). In the laboratory the toads were placed in the constant source of heat and were recorded body temperatures each 5 min until arriving to the CTmax, which is defined as the body temperature at which the toads could no longer right themselves when turned on their backs. The thermal range was 36 2.2 C and not shows significatives differences between season (DS and WS). The CTmax. Was different between the seasons (Mann-Whitney: U=10.5, p<0.00004). In the WS (36.11ｱ0.24) was more elevated than DS (34.1ｱ0.33). The CTmax was correlation whit the TMD (Spearman, R=0.71, p<0.00006) and Tb (Spearman, R=0.45, p<0.02) and not show relation with other parameters (Hr and TmD). The modification of the thermal extremes with the climatic variables is physiological strategy for survival at the thermal changes of the environmental.

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