Abstract
How ectotherms exploit thermal resources has important implications for their habitat utilization and thermal vulnerability to climate warming. To address this issue, we investigated thermal relations of three sympatric lizard species (Eremias argus, Eremias multiocellata, and Phrynocephalus przewalskii) in the desert steppe of Inner Mongolia, China. We determined the thermoregulatory behavior, body temperature (T b), operative temperature (T e), selected body temperature (T sel), and critical thermal maximum (CTmax) of adult lizards. Based on these physiological parameters, we quantified the accuracy and effectiveness of thermoregulation as well as thermal-safety margin for these species. The three species were accurate and effective thermoregulators. The P. przewalskii preferred open habitats, and had a higher T b than the two Eremias lizards, which preferred shade habitats and shuttled more frequently between the shade and sun. This indicated that the three sympatric lizards have different thermoregulatory behavior and thermal physiology, which might facilitate their coexistence in the desert steppe ecosystem. In addition, the P. przewalskii had higher T sel and CTmax, and a wider thermal-safety margin than the two Eremias lizards, suggesting that the two Eremias lizards would be more vulnerable to climate warming than P. przewalskii.
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Acknowledgements
We thank Peng Cao and Shao-Yong Chen for assistance in the field. We are grateful to the staffs at Shierliancheng Field Station, Institute of Grassland Research of the Chinese Academy of Agricultural Sciences for logistic support. Funding was supported by the National Key Research and Development Program of China (2016YFC0503200).
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Research was performed under approvals from the Animal Ethics Committee at the Institute of Zoology, Chinese Academy of Sciences (IOZ14001).
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Communicated by G. Heldmaier.
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Li, SR., Wang, Y., Ma, L. et al. Thermal ecology of three coexistent desert lizards: Implications for habitat divergence and thermal vulnerability. J Comp Physiol B 187, 1009–1018 (2017). https://doi.org/10.1007/s00360-017-1087-4
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DOI: https://doi.org/10.1007/s00360-017-1087-4