Chemical signaling glands are unlinked to species diversification in lizards
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Final Accepted Manuscript
Affiliation
Department of Ecology and Evolutionary Biology, University of ArizonaIssue Date
2023-06-02Keywords
chemical communicationfemoral pores
follicular epidermal glands
pheromones
sexual selection
speciation
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Oxford University Press (OUP)Citation
Gopal Murali, Shai Meiri, Uri Roll, Chemical signaling glands are unlinked to species diversification in lizards, Evolution, Volume 77, Issue 8, August 2023, Pages 1829–1841, https://doi.org/10.1093/evolut/qpad101Rights
© The Author(s) 2023. Published by Oxford University Press on behalf of The Society for the Study of Evolution (SSE). All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Sexual selection has long been thought to increase species diversification. Sexually selected traits, such as sexual signals that contribute to reproductive isolation, were thought to promote diversification. However, studies exploring links between sexually selected traits and species diversification have thus far primarily focused on visual or acoustic signals. Many animals often employ chemical signals (i.e., pheromones) for sexual communications, but large-scale analyses on the role of chemical communications in driving species diversification have been missing. Here, for the first time, we investigate whether traits associated with chemical communications-the presence of follicular epidermal glands-promote diversification across 6,672 lizard species. In most analyses, we found no strong association between the presence of follicular epidermal glands and species diversification rates, either across all lizard species or at lower phylogenetic scales. Previous studies suggest that follicular gland secretions act as species recognition signals that prevent hybridization during speciation in lizards. However, we show that geographic range overlap was no different in sibling species pairs with and without follicular epidermal glands. Together, these results imply that either follicular epidermal glands do not primarily function in sexual communications or sexually selected traits in general (here chemical communication) have a limited effect on species diversification. In our additional analysis accounting for sex-specific differences in glands, we again found no detectable effect of follicular epidermal glands on species diversification rates. Thus, our study challenges the general role of sexually selected traits in broad-scale species diversification patterns.Note
12 month embargo; first published 02 June 2023ISSN
0014-3820EISSN
1558-5646Version
Final accepted manuscriptSponsors
Israel Science Foundationae974a485f413a2113503eed53cd6c53
10.1093/evolut/qpad101