Evolutionary genetics of personality in the Trinidadian guppy II: Sexual dimorphism and genotype-by-sex interactions (article)
White, S; Houslay, T; Wilson, A
Date: 23 May 2018
Journal
Heredity
Publisher
Springer Nature
Publisher DOI
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Abstract
Sexual dimorphism in behaviour and personality have been identified in a number of
species, but few studies have assessed the extent of shared genetic architecture across
the sexes. Under sexually antagonistic selection, mechanisms are expected to evolve
that reduce evolutionary conflict, resulting in genotype-by-sex (GxS) interactions. ...
Sexual dimorphism in behaviour and personality have been identified in a number of
species, but few studies have assessed the extent of shared genetic architecture across
the sexes. Under sexually antagonistic selection, mechanisms are expected to evolve
that reduce evolutionary conflict, resulting in genotype-by-sex (GxS) interactions. Here,
we assess the extent of sexual dimorphism in four risk-taking behaviour traits in the
Trinidadian guppy, Poecilia reticulata, and apply a multivariate approach to test for
GxS interactions. We also quantify the among-individual and genetic covariances
between personality and size and growth which are known a priori to differ between the
sexes. We found significant sexual dimorphism in three of the four behaviours, although
rmf between sex-specific homologous traits was significantly less than +1 for only one
behaviour. Using multivariate models, we then estimated sex-specific genetic
(co)variance matrices (Gm and Gf) and tested for asymmetry of the cross-trait cross-sex
genetic covariance structure (submatrix B). While Gm and Gf were not significantly
different from each other overall, their respective leading eigen vectors were poorly
aligned. Statistical support for asymmetry in B was found, but limited to a single trait
pair for which the cross-sex covariances differed (i.e. COVA(m,f) ≠ COVA(f,m)). Thus, while
single- and multi-trait perspectives evidence some GxS, the overall picture is one of
similarity between the sexes in their genetic (co)variance structures. Our results suggest
behavioural traits related to risk-taking may lack the sex-specific genetic architecture
for further dimorphism to evolve under what is hypothesised to be antagonistic
selection.
Biosciences - old structure
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