The phenotypic and genetic covariance structure of drosphilid wings

McGuigan, K. and Blows, M. W. (2007) The phenotypic and genetic covariance structure of drosphilid wings. Evolution, 61 4: 902-911. doi:10.1111/j.1558-5646.2007.00078.x


Author McGuigan, K.
Blows, M. W.
Title The phenotypic and genetic covariance structure of drosphilid wings
Journal name Evolution   Check publisher's open access policy
ISSN 0014-3820
Publication date 2007-01-01
Sub-type Article (original research)
DOI 10.1111/j.1558-5646.2007.00078.x
Volume 61
Issue 4
Start page 902
End page 911
Total pages 10
Editor Rausher, M. D.
Place of publication Lawrence, USA
Publisher Blackwell Publishing Ltd
Language eng
Subject C1
270207 Quantitative Genetics
270799 Ecology and Evolution not elsewhere classified
780105 Biological sciences
Abstract Evolutionary constraint results from the interaction between the distribution of available genetic variation and the position of selective optima. The availability of genetic variance in multitrait systems, as described by the additive genetic variance-covariance matrix (G), has been the subject of recent attempts to assess the prevalence of genetic constraints. However, evolutionary constraints have not yet been considered from the perspective of the phenotypes available to multivariate selection, and whether genetic variance is present in all phenotypes potentially under selection. Determining the rank of the phenotypic variance-covariance matrix (P) to characterize the phenotypes available to selection, and contrasting it with the rank of G, may provide a general approach to determining the prevalence of genetic constraints. In a study of a laboratory population of Drosophila bunnanda from northern Australia we applied factor-analytic modeling to repeated measures of individual wing phenotypes to determine the dimensionality of the phenotypic space described by P. The phenotypic space spanned by the 10 wing traits had 10 statistically supported dimensions. In contrast, factor-analytic modeling of G estimated for the same 10 traits from a paternal half-sibling breeding design suggested G had fewer dimensions than traits. statistical support was found for only five and two genetic dimensions, describing a total of 99% and 72% of genetic variance in wing morphology in females and males, respectively. The observed mismatch in dimensionality between P and G suggests that although selection might act to shift the intragenerational population mean toward any trait combination, evolution may be restricted to fewer dimensions.
Keyword Ecology
Evolutionary Biology
Genetics & Heredity
G-matrix
evolutionary potential
genetic constraints
matrix rank
P-matrix
sexual dimorphism
wing shape
Drosophila-melanogaster
Quantitative Genetics
Insect Wings
Morphological Integration
Phylogenetic Analysis
Cheveruds Conjecture
Principal Components
Correlated Response
Sexual Selection
Body-size
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Tue, 19 Feb 2008, 02:54:01 EST