Reduced genetic variance among high fitness individuals: inferring stabilizing selection on male sexual displays in Drosophila serrata

Sztepanacz, Jacqueline L. and Rundle, Howard D. (2012) Reduced genetic variance among high fitness individuals: inferring stabilizing selection on male sexual displays in Drosophila serrata. Evolution, 66 10: 3101-3110. doi:10.1111/j.1558-5646.2012.01658.x


Author Sztepanacz, Jacqueline L.
Rundle, Howard D.
Title Reduced genetic variance among high fitness individuals: inferring stabilizing selection on male sexual displays in Drosophila serrata
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
1558-5646
Publication date 2012-10-01
Sub-type Article (original research)
DOI 10.1111/j.1558-5646.2012.01658.x
Open Access Status DOI
Volume 66
Issue 10
Start page 3101
End page 3110
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract Directional selection is prevalent in nature, yet phenotypes tend to remain relatively constant, suggesting a limit to trait evolution. However, the genetic basis of this limit is unresolved. Given widespread pleiotropy, opposing selection on a trait may arise from the effects of the underlying alleles on other traits under selection, generating net stabilizing selection on trait genetic variance. These pleiotropic costs of trait exaggeration may arise through any number of other traits, making them hard to detect in phenotypic analyses. Stabilizing selection can be inferred, however, if genetic variance is greater among low- compared to high-fitness individuals. We extend a recently suggested approach to provide a direct test of a difference in genetic variance for a suite of cuticular hydrocarbons (CHCs) in Drosophila serrata. Despite strong directional sexual selection on these traits, genetic variance differed between high- and low-fitness individuals and was greater among the low-fitness males for seven of eight CHCs, significantly more than expected by chance. Univariate tests of a difference in genetic variance were nonsignificant but likely have low power. Our results suggest that further CHC exaggeration in D. serrata in response to sexual selection is limited by pleiotropic costs mediated through other traits.
Keyword Cuticular hydrocarbons
Evolutionary limit
Fitness optimum
Opposing selection
Pleiotropy
Sexual selection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Biological Sciences Publications
 
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Created: Tue, 09 Apr 2013, 21:01:05 EST by Jacqueline Sztepanacz on behalf of School of Biological Sciences