Indirect genetic effects (IGEs) describe the effect of the genes of social partners on the phenotype of a focal individual. Here, we measure indirect genetic effects using the "coefficient of interaction" (Ψ) to test whether Ψ evolved between and . We compare Ψ for locomotion between ethanol and nonethanol environments in both species, but only utilizes ethanol ecologically. We find that while sexual dimorphism for locomotion has been reversed in , there has been no evolution of social effects between these two species. What did evolve was the interaction between genotype-specific Ψ and the environment, as varies unpredictably between environments and does not. In this system, this suggests evolutionary lability of sexual dimorphism but a conservation of social effects, which brings forth interesting questions about the role of the social environment in sexual selection.
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| http://dx.doi.org/10.1002/ece3.3523 | DOI Listing |
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