Sexual Dichromatism Drives Diversification within a Major Radiation of African Amphibians

Portik, Daniel M. and Bell, Rayna C. and Blackburn, David C. and Bauer, Aaron M. and Barratt, Christopher D. and Branch, William R. and Burger, Marius and Channing, Alan and Colston, Timothy J. and Conradie, Werner and Dehling, J. Maximilian and Drewes, Robert C. and Ernst, Raffael and Greenbaum, Eli and Gvoždík, Václav and Harvey, James and Hillers, Annika and Hirschfeld, Mareike and Jongsma, Gregory F. M. and Kielgast, Jos and Kouete, Marcel T. and Lawson, Lucinda P. and Leaché, Adam D. and Loader, Simon P. and Lötters, Stefan and Van Der Meijden, Arie and Menegon, Michele and Müller, Susanne and Nagy, Zoltán T. and Ofori-Boateng, Caleb and Ohler, Annemarie and Papenfuss, Theodore J. and Rößler, Daniela and Sinsch, Ulrich and Rödel, Mark-Oliver and Veith, Michael and Vindum, Jens and Zassi-Boulou, Ange-Ghislain and McGuire, Jimmy A.. (2019) Sexual Dichromatism Drives Diversification within a Major Radiation of African Amphibians. Systematic Biology, 68 (6). pp. 859-875.

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Theory predicts that sexually dimorphic traits under strong sexual selection, particularly those involved with intersexual signaling, can accelerate speciation and produce bursts of diversification. Sexual dichromatism (sexual dimorphism in color) is widely used as a proxy for sexual selection and is associated with rapid diversification in several animal groups, yet studies using phylogenetic comparative methods to explicitly test for an association between sexual dichromatism and diversification have produced conflicting results. Sexual dichromatism is rare in frogs, but it is both striking and prevalent in African reed frogs, a major component of the diverse frog radiation termed Afrobatrachia. In contrast to most other vertebrates, reed frogs display female-biased dichromatism in which females undergo color transformation, often resulting in more ornate coloration in females than in males. We produce a robust phylogeny of Afrobatrachia to investigate the evolutionary origins of sexual dichromatism in this radiation and examine whether the presence of dichromatism is associated with increased rates of net diversification. We find that sexual dichromatism evolved once within hyperoliids and was followed by numerous independent reversals to monochromatism. We detect significant diversification rate heterogeneity in Afrobatrachia and find that sexually dichromatic lineages have double the average net diversification rate of monochromatic lineages. By conducting trait simulations on our empirical phylogeny, we demonstrate that our inference of trait-dependent diversification is robust. Although sexual dichromatism in hyperoliid frogs is linked to their rapid diversification and supports macroevolutionary predictions of speciation by sexual selection, the function of dichromatism in reed frogs remains unclear. We propose that reed frogs are a compelling system for studying the roles of natural and sexual selection on the evolution of sexual dichromatism across micro- and macroevolutionary timescales.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Biogeographie (Nagel)
UniBasel Contributors:Loader, Simon Paul and Barratt, Christopher
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Oxford University Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:09 Nov 2020 16:21
Deposited On:09 Nov 2020 16:21

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