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Article: Uninformative Exaggeration of Male Sexual Ornaments in Barn Swallows

TitleUninformative Exaggeration of Male Sexual Ornaments in Barn Swallows
Authors
KeywordsEVO_ECOL
Issue Date2007
Citation
Current Biology, 2007, v. 17, n. 10, p. 850-855 How to Cite?
AbstractModels of sexual selection suggest that mate-choice preferences are favored because differences between males in their degree of ornamental exaggeration convey useful information about the direct or indirect benefits they have to offer [1-5]. Such arguments assume that variation in male ornament size can be attributed to variation in the degree of sexually selected exaggeration. We provide the first test of this assumption by conducting tail-length experiments in male barn swallows. Over the last twenty years, a large amount of work has shown that female barn swallows are influenced by male tail length when choosing a mate [6-12]. Recent experiments have shown that a combination of natural and sexual selection results in the elongated tail streamer-a tail that is on average across the population about 12 mm (∼10%) longer than the aerodynamic optimum [13, 14]. We show that the aerodynamically optimal tail length varies significantly between males, whereas the extent of streamer elongation beyond the optimum does not. Similarly, the aerodynamically optimal tail length significantly predicts observed tail length and conveys information about flight performance, whereas the extent of sexually selected exaggeration of streamer length does not. Therefore, contrary to handicap models of sexual selection, the sexually selected exaggeration of this trait provides females with little information about any aspect of mate quality. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/230779
ISSN
2015 Impact Factor: 8.983
2015 SCImago Journal Rankings: 4.729

 

DC FieldValueLanguage
dc.contributor.authorBro-Jørgensen, Jakob-
dc.contributor.authorJohnstone, Rufus A.-
dc.contributor.authorEvans, Matthew R.-
dc.date.accessioned2016-09-01T06:06:47Z-
dc.date.available2016-09-01T06:06:47Z-
dc.date.issued2007-
dc.identifier.citationCurrent Biology, 2007, v. 17, n. 10, p. 850-855-
dc.identifier.issn0960-9822-
dc.identifier.urihttp://hdl.handle.net/10722/230779-
dc.description.abstractModels of sexual selection suggest that mate-choice preferences are favored because differences between males in their degree of ornamental exaggeration convey useful information about the direct or indirect benefits they have to offer [1-5]. Such arguments assume that variation in male ornament size can be attributed to variation in the degree of sexually selected exaggeration. We provide the first test of this assumption by conducting tail-length experiments in male barn swallows. Over the last twenty years, a large amount of work has shown that female barn swallows are influenced by male tail length when choosing a mate [6-12]. Recent experiments have shown that a combination of natural and sexual selection results in the elongated tail streamer-a tail that is on average across the population about 12 mm (∼10%) longer than the aerodynamic optimum [13, 14]. We show that the aerodynamically optimal tail length varies significantly between males, whereas the extent of streamer elongation beyond the optimum does not. Similarly, the aerodynamically optimal tail length significantly predicts observed tail length and conveys information about flight performance, whereas the extent of sexually selected exaggeration of streamer length does not. Therefore, contrary to handicap models of sexual selection, the sexually selected exaggeration of this trait provides females with little information about any aspect of mate quality. © 2007 Elsevier Ltd. All rights reserved.-
dc.languageeng-
dc.relation.ispartofCurrent Biology-
dc.subjectEVO_ECOL-
dc.titleUninformative Exaggeration of Male Sexual Ornaments in Barn Swallows-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.cub.2007.03.042-
dc.identifier.pmid17412591-
dc.identifier.scopuseid_2-s2.0-34247890067-
dc.identifier.volume17-
dc.identifier.issue10-
dc.identifier.spage850-
dc.identifier.epage855-

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