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Demography of Xenosaurus platyceps (Squamata: Xenosauridae): a comparison between tropical and temperate populations

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There appears to be variation in life-history strategies even between populations of the same species. For ectothermic organisms such as lizards, it has been predicted that demographic and life-history traits should differ consistently between temperate and tropical populations. This study compares the demographic strategies of a temperate and a tropical population of the lizard Xenosaurus platyceps. Population growth rates in both types of environments indicated populations in numerical equilibrium. Of the two populations, we found that the temperate population experiences lower adult mortality. The relative importance (estimated as the relative contribution to population growth rate) of permanence and of the adult/reproductive size classes is higher in the temperate population. In contrast, the relative importance for average fitness of fecundity and growth is higher in the tropical population. These results are consistent with the theoretical frameworks about life-historical differences among tropical and temperate lizard populations.

Affiliations: 1: Laboratorio de Ecología, Unidad de Biología, Tecnología y Prototipos, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Los Reyes Iztacala, Tlalnepantla, Estado de México 54090, México; 2: Evolutionary Ecology Laboratories, Department of Biology, 401 WIDB, Brigham Young University, Provo, UT 84602, USA;, Email:; 3: Evolutionary Ecology Laboratories, Department of Biology, 401 WIDB, Brigham Young University, Provo, UT 84602, USA


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