Sex-dependent selection differentially shapes genetic variation on and off the guppy Y chromosome

Postma, Erik, Spyrou, Nicolle, Rollins, Lee Ann and Brooks, Robert C. 2011, Sex-dependent selection differentially shapes genetic variation on and off the guppy Y chromosome, Evolution, vol. 65, no. 8, pp. 2145-2156.

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Title Sex-dependent selection differentially shapes genetic variation on and off the guppy Y chromosome
Author(s) Postma, Erik
Spyrou, Nicolle
Rollins, Lee Ann
Brooks, Robert C.
Journal name Evolution
Volume number 65
Issue number 8
Start page 2145
End page 2156
Total pages 12
Publisher Wiley-Blackwell Publishing Ltd
Place of publication Oxford, England
Publication date 2011-08
ISSN 0014-3820
1558-5646
Keyword(s) animal model
fitness surface
G matrix
intra-locus sexual conflict
poecilia reticulata
sex chromosome
Summary Because selection is often sex-dependent, alleles can have positive effects on fitness in one sex and negative effects in the other, resulting in intralocus sexual conflict. Evolutionary theory predicts that intralocus sexual conflict can drive the evolution of sex limitation, sex-linkage, and sex chromosome differentiation. However, evidence that sex-dependent selection results in sex-linkage is limited. Here, we formally partition the contribution of Y-linked and non-Y-linked quantitative genetic variation in coloration, tail, and body size of male guppies (Poecilia reticulata)—traits previously implicated as sexually antagonistic. We show that these traits are strongly genetically correlated, both on and off the Y chromosome, but that these correlations differ in sign and magnitude between both parts of the genome. As predicted, variation in attractiveness was found to be associated with the Y-linked, rather than with the non-Y-linked component of genetic variation in male ornamentation. These findings show how the evolution of Y-linkage may be able to resolve sexual conflict. More generally, they provide unique insight into how sex-specific selection has the potential to differentially shape the genetic architecture of fitness traits across different parts of the genome.
Language eng
Field of Research 060411 Population, Ecological and Evolutionary Genetics
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, Wiley-Blackwell Publishing
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047903

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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