Population variation in sexual selection and its effect on size allometry in two dung fly species with contrasting sexual size dimorphism

Evolution; International Journal of Organic Evolution
U Kraushaar, Wolf U Blanckenhorn

Abstract

Body size is one of the most important quantitative traits under evolutionary scrutiny. Sexual size dimorphism (SSD) in a given species is expected to result if opposing selection forces equilibrate differently in both sexes. We document variation in the intensity of sexual and fecundity selection, male and female body size, and thus SSD among 31 and 27 populations of the two dung fly species, Scathophaga stercoraria and Sepsis cynipsea, across Switzerland. Whereas in S. cynipsea females are larger, the SSD is reversed in S. stercoraria. We comprehensively evaluated Fairbairn and Preziosi's (1994) general, three-tiered scenario, hypothesizing that sexual selection for large male size is the major driving force of SSD allometry within these two species. Sexual selection intensity on male size in the yellow dung fly, S. stercoraria, was overall positive, greater, and more variable among populations than fecundity selection on females. Also, sexual selection intensity in a given population correlated positively with mean male body size of that population for both the field-caught fathers and their laboratory-reared sons, indicating a response to selection. In S. cvnipsea, sexual selection intensity on males was lower overall and s...Continue Reading

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Citations

Dec 18, 2009·Biological Reviews of the Cambridge Philosophical Society·Steven L Chown, Kevin J Gaston
Dec 17, 2008·Annals of Human Biology·Anders Gustafsson, Patrik Lindenfors
Nov 1, 2009·Molecular Ecology Resources·Maja P GremingerMichael Krützen
Aug 24, 2007·Journal of Evolutionary Biology·C Fernández-Montraveta, J Moya-Laraño
Dec 1, 2006·Evolution; International Journal of Organic Evolution·Wolf U BlanckenhornKyle G Ashton
Oct 5, 2011·Evolution; International Journal of Organic Evolution·David BergerMartin Andreas Schäfer
Jul 16, 2015·Evolution; International Journal of Organic Evolution·Wolf U Blanckenhorn
Nov 1, 2005·Theoretical Population Biology·Daniel D Wiegmann, Truc Nguyen
May 12, 2015·Journal of Fish Biology·B Jonsson, N Jonsson
Jul 5, 2012·Evolution; International Journal of Organic Evolution·Nalini PuniamoorthyWolf U Blanckenhorn
Nov 15, 2013·Proceedings. Biological Sciences·Brian E GressScott Pitnick
May 12, 2016·Evolution; International Journal of Organic Evolution·Patrick T RohnerNalini Puniamoorthy
Oct 20, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Leigh W SimmonsDavid J Hosken

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