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20 August 2015 Impacts of thermal limitation on thermoregulatory behaviour and reproductive success in a lizard
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Climatic variation can impact populations of ectotherms by altering reproduction, development, and survival. While a warm climate can provide additional thermal opportunities for ectotherms, excessively warm conditions can restrict activity in avoidance of lethal temperatures. However, ectotherms are not necessarily passive to thermal conditions, and often employ flexible thermoregulatory behaviour to accommodate environmental variation. Here, we examine whether the Australian jacky dragon lizard, Amphibolurus muricatus, can compensate for reduced basking opportunity by basking with greater intensity, and how the thermal environment influences reproductive success in females. Overall, there was no compelling evidence for compensatory thermoregulatory behaviour in response to reduced basking opportunity. Moreover, females with reduced thermal opportunities did not produce eggs, although reproductive success was quite low for both groups, so additional factors may have limited reproduction in the colony. This study allows insight into the links between climate and population persistence in wild animals by providing crucial and rare data on how thermal environment impacts reproduction in an egg-laying lizard.

© CSIRO 2015
Jennifer E. Halstead and Lisa E. Schwanz "Impacts of thermal limitation on thermoregulatory behaviour and reproductive success in a lizard," Australian Journal of Zoology 63(4), 225-232, (20 August 2015).
Received: 13 March 2015; Accepted: 1 July 2015; Published: 20 August 2015

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