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Sexual size dimorphism is not associated with the evolution of parental care in frogs
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology.ORCID iD: 0000-0003-1692-7938
2014 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 4, no 20, 4001-4008 p.Article in journal (Refereed) Published
Abstract [en]

Sex differences in parental care are thought to arise from differential selection on the sexes. Sexual dimorphism, including sexual size dimorphism (SSD), is often used as a proxy for sexual selection on males. Some studies have found an association between male-biased SSD (i.e., males larger than females) and the loss of paternal care. While the relationship between sexual selection on males and parental care evolution has been studied extensively, the relationship between female-biased SSD (i.e., females larger than males) and the evolution of parental care has received very little attention. Thus, we have little knowledge of whether female-biased SSD coevolves with parental care. In species displaying female-biased SSD, we might expect dimorphism to be associated with the evolution of paternal care or perhaps the loss of maternal care. Here, drawing on data for 99 extant frog species, we use comparative methods to evaluate how parental care and female-biased SSD have evolved over time. Generally, we find no significant correlation between the evolution of parental care and female-biased SSD in frogs. This suggests that differential selection on body size between the sexes is unlikely to have driven the evolution of parental care in these clades and questions whether we should expect sexual dimorphism to exhibit a general relationship with the evolution of sex differences in parental care.

Place, publisher, year, edition, pages
2014. Vol. 4, no 20, 4001-4008 p.
National Category
Ecology
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URN: urn:nbn:se:uu:diva-239385DOI: 10.1002/ece3.1263ISI: 000344476500010OAI: oai:DiVA.org:uu-239385DiVA: diva2:774389
Available from: 2014-12-22 Created: 2014-12-22 Last updated: 2017-12-05Bibliographically approved

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Monroe, Melanie J.

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