Female dewlap ornaments are evolutionarily labile and associated with increased diversification rates in Anolis lizards

Author:

Yuan Michael L.12ORCID,Westeen Erin P.3ORCID,Wogan Guinevere O. U.4ORCID,Wang Ian J.3ORCID

Affiliation:

1. Center for Population Biology, University of California, Davis, CA 95616, USA

2. Department of Evolution and Ecology, University of California, Davis, CA 95616, USA

3. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720, USA

4. Department of Integrative Biology, Oklahoma State University, Stillwater, OK 74078, USA

Abstract

The evolution of costly signalling traits has largely focused on male ornaments. However, our understanding of ornament evolution is necessarily incomplete without investigating the causes and consequences of variation in female ornamentation. Here, we study the Anolis lizard dewlap, a trait extensively studied as a male secondary sexual characteristic but present in females of several species. We characterized female dewlaps for 339 species to test hypotheses about their evolution. Our results did not support the hypothesis that female dewlaps are selected against throughout the anole phylogeny. Rather, we found that female dewlaps were evolutionary labile. We also did not find support for the adaptive hypothesis that interspecific competition drove the evolution of female dewlaps. However, we did find support for the pleiotropy hypothesis as species with larger females and reduced sexual size dimorphism were more likely to possess female dewlaps. Lastly, we found that female dewlap presence influenced diversification rates in anoles, but only secondarily to a hidden state. Our results demonstrate that female ornamentation is widespread in anoles and the traditional hypothesis of divergent selection between the sexes does not fully explain their evolution. Instead, female ornamentation is likely to be subject to complex adaptive and non-adaptive evolutionary forces.

Funder

NSF

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Environmental Science,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine

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