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Sexual selection and the evolution of complex color patterns in dragon lizards
I-Ping Chen1, Devi Stuart-Fox, Andrew F Hugall
1Department of Zoology, University of Melbourne, Victoria 3010, Australia. matthew.symonds@deakin.edu.au
Evolution; International Journal of Organic Evolution
|October 31, 2012
Summary
Sexual selection drives complex color patterns in male dragon lizards, not environmental factors. This study reveals how mating preferences shape the intricate coloration seen in many species.
Area of Science:
- Evolutionary Biology
- Animal Behavior
- Ecology
Background:
- Species exhibit complex coloration and patterning, often differing between sexes.
- Sexual selection can drive elaboration or innovation in color patterns, potentially increasing complexity.
- Ecological factors like predation and environment may also influence color pattern complexity, but few studies examine both selection types.
Purpose of the Study:
- To investigate the effects of sexual and natural selection on color pattern complexity across Australian dragon lizards (Agamidae).
- To quantify color pattern complexity and its correlation with sexual dimorphism and environmental factors.
Main Methods:
- Phylogenetic comparative approach used on 85 species and subspecies of Australian dragon lizards.
- Color pattern complexity quantified using an adaptation of the Shannon-Wiener diversity index.
- Examined correlations between complexity, sexual dichromatism, sexual size dimorphism, and environmental factors.
Main Results:
- Significant sex differences in color pattern complexity were observed.
- Complexity positively correlated with sexual dichromatism and sexual size dimorphism, supporting sexual selection's role.
- Little evidence linked environmental factors to complexity in predator-exposed areas.
Conclusions:
- Sexual selection appears to be the primary driver of increased color pattern complexity in male dragon lizards.
- Natural selection had a minimal impact on the complexity of color patterns in predator-exposed regions.
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