The comparative field body temperature among Liolaemus lizards: Testing the static and the labile hypotheses |
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Authors: | Enrique Rodrí guez-Serrano, Carlos A. Navas,Francisco Bozinovic, |
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Affiliation: | aCenter for Advanced Studies in Ecology & Biodiversity (CASEB), LINC-Global, Departamento de Ecología, Pontificia Universidad Católica de Chile, Santiago 6513677, Chile;bDepartamento de Fisiología, Instituto de Biociências, Universidade de São Paulo, Rua do Matão Tr. 14 No. 321, CEP 05508-900 São Paulo, SP, Brazil |
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Abstract: | Two competing hypotheses have been suggested to explain thermal sensitivity of lizards to environmental conditions. These are the static and the labile hypotheses. The static hypothesis posits that thermal physiology is evolutionary conservative and consequently relatively insensitive to directional selection. Contrarily, the labile hypothesis states that thermal physiology does respond readily to directional selection in some lizard taxa. In this paper, we tested both hypotheses among species of Liolaemus lizards. The genus Liolaemus is diverse with about 200 species, being broadly distributed from central Perú to Tierra del Fuego at the southern end of South America. Data of field body temperature (Tb) from Liolaemus species were collected from the literature. Based on the distributional range of the species we also collected data of mean annual ambient temperatures. We observed that both the traditional analysis and the phylogenetic approach indicate that in the genus Liolaemus Tb of species varies in a manner that is consistent with ecological gradient of ambient temperature. The data suggest that the thermal physiology of Liolaemus lizards is evolutionarily flexible, and that this plasticity has been partially responsible for the colonization of a wide array of thermal environments. |
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Keywords: | Liolaemus lizards Thermoregulation Global warming South America |
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