An examination of genetic variation and selection on condition in Drosophila melanogaster males

Rode, Nicolas and Morrow, Edward (2009) An examination of genetic variation and selection on condition in Drosophila melanogaster males. Entomologia Experimentalis et Applicata, 131 (2). pp. 167-177. ISSN 0013-8703

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Abstract

According to the genic capture hypothesis, the maintenance of additive genetic variation in fitness-related traits is due to both condition-dependence of these traits and high genetic variation for condition. Evidence supporting this latter assumption is scarce. In this study, we investigated, using hemiclonal analysis, standing genetic variation for condition and relative adult fitness in male Drosophila melanogaster (Meigen) (Diptera: Drosophilidae). The absolute fat and the relative fat content were used as indices of body condition and were measured along with adult relative fitness from males reared in high or low larval densities. The results did not demonstrate genetic variation for condition or adult relative fitness. However, the larval density encountered during development had a strong and significant effect on all traits. Surprisingly, although not significant, negative selection gradients acting on absolute fat and relative fat content were also found in both treatments. These findings challenge one of the main assumptions of the genic capture hypothesis and the use of fat content as an ideal index of condition.

Item Type: Article
Keywords: lek paradox; genic capture hypothesis;heritability; hemiclonal analysis; sexual selection;Diptera; Drosophilidae; fat content; fitness
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science > Q Science (General)
Depositing User: Ted Morrow
Date Deposited: 31 Oct 2012 11:42
Last Modified: 15 May 2015 10:39
URI: http://sro.sussex.ac.uk/id/eprint/40280
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