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Sex Ratio Bias Leads to the Evolution of Sex Role Reversal in Honey Locust Beetles
Graz Univ, Dept Zool, Univ Pl 2, A-8010 Graz, Austria..
Univ Zurich, Inst Evolutionary Biol & Environm Studies, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2016 (English)In: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 26, no 18, 2522-2526 p.Article in journal (Refereed) Published
Abstract [en]

The reversal of conventional sex roles was enigmatic to Darwin, who suggested that it may evolve when sex ratios are female biased [1]. Here we present direct evidence confirming Darwin's hypothesis. We investigated mating system evolution in a sex-role reversed beetle (Megabruchidius dorsalis) using experimental evolution under manipulated sex ratios and food regimes. In female-biased populations, where reproductive competition among females was intensified, females evolved to be more attractive and the sex roles became more reversed. Interestingly, female-specific mating behavior evolved more rapidly than male-specific mating behavior. We show that sexual selection due to reproductive competition can be strong in females and can target much the same traits as in males of species with conventional mating systems. Our study highlights two central points: the role of ecology in directing sexual selection and the role that females play in mating system evolution.

Place, publisher, year, edition, pages
2016. Vol. 26, no 18, 2522-2526 p.
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-306754DOI: 10.1016/j.cub.2016.07.018ISI: 000384512600031PubMedID: 27593373OAI: oai:DiVA.org:uu-306754DiVA: diva2:1045513
EU, European Research Council, AdG-294333Swedish Research Council, 621-2010-5266
Available from: 2016-11-09 Created: 2016-11-03 Last updated: 2016-11-09Bibliographically approved

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