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Daniel Dashevsky, Jesse M. Meik, Estrella Mociño-Deloya, Kirk Setser and Sarah Schaack Patterns of sexual dimorphism in Mexican alligator lizards, Barisia imbricata Ecology and Evolution 3

Article first published online: 26 DEC 2012 | DOI: 10.1002/ece3.455

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Our study includes an analysis of an array of morphological characters including classic size and shape traits as well as the frequency of scarring, tail loss, and the observation that males and females exhibit opposite sex patterning in this population of this species. Our main result is that individuals in this population of B. imbricata are sexually dimorphic for many of the traits we measured, which has not been reported previously for this species. We explore the alternative hypotheses explaining the observed patterns and conclude that there is evidence for parallel effects of natural selection on females and sexual selection on males for large body size.

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