Abstract
We determined and compared the efficiency of thermoregulation of Rhinella arenarum in the Monte desert (Argentina) in two seasons, dry and wet. In the field, we measured body temperatures, micro-habitat temperatures and operative temperatures; while in the laboratory; we measured the selected body temperatures. Our results show a change in the thermoregulatory strategy of R. arenarum that is related to environmental constraints on their thermal niche. R. arenarum has the ability to be plastic and combine two strategies: (i) a moderate thermoregulator in the wet season, where thermal resources are available such that body temperature is maintained within the set points and physiologicial and behavioral processes are optimized; and (ii) a thermoconformer in the dry season where the thermal environment is more homogeneous and there is greater time invested in searching for food.
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