Abstract
Liolaemini lizards occur in southern South America in a variety of dietary habits across a broad latitudinal and altitudinal distribution. We studied standard metabolic rates of 19 Liolaemini species and analyzed these data using both conventional and phylogenetically informed statistics. Oxygen consumption showed a significant and positive relationship with body mass (SMR = 0.109 × body mass0.876±0.023), with a higher slope than that expected on the basis of the three-quarter power law model. After phylogenetically informed and conventional analyses, no significant differences in metabolic rates were found to be related to diet or elevation. We hypothesize that small body size, ecological conservatism and physiological compensation may explain the lack of differences in metabolic rates observed among these lizards.


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Acknowledgments
J.C. Acosta, J. Villavicencio gave great help in the field. We thank M. Angilletta Jr., A. Herrel, D. Milano, J. Schulte II and two anonymous reviewers for their critical reading of early versions of the manuscript. We specially thank A. Herrel for helping us further than reviewing the manuscript. Fauna authorities provided permits to collect in the following Argentine provinces; Neuquén (C. Buzzo), Río Negro (M. Faillá), Salta (A. Ortin), La Rioja (A. Norino), San Juan (Z. Invernazi) and Catamarca (E. Fra). This study was partially supported by PICT-ANPyCT 06-01205, and PIP CONICET 6287.
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Communicated by I.D. Hume
D. Antenucci was formerly Antinuchi.
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Cruz, F.B., Antenucci, D., Luna, F. et al. Energetics in Liolaemini lizards: implications of a small body size and ecological conservatism. J Comp Physiol B 181, 373–382 (2011). https://doi.org/10.1007/s00360-010-0524-4
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DOI: https://doi.org/10.1007/s00360-010-0524-4