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Balancing selection via life-history trade-offs maintains an inversion polymorphism in a seaweed fly

Abstract : How natural diversity is maintained is an evolutionary puzzle. Genetic variation can be eroded by drift and directional selection but some polymorphisms persist for long time periods, implicating a role for balancing selection. Here, we investigate the maintenance of a chro-mosomal inversion polymorphism in the seaweed fly Coelopa frigida. Using experimental evolution and quantifying fitness, we show that the inversion underlies a life-history trade-off, whereby each haplotype has opposing effects on larval survival and adult reproduction. Numerical simulations confirm that such antagonistic pleiotropy can maintain polymorphism. Our results also highlight the importance of sex-specific effects, dominance and environmental heterogeneity, whose interaction enhances the maintenance of polymorphism through antagonistic pleiotropy. Overall, our findings directly demonstrate how over-dominance and sexual antagonism can emerge from a life-history trade-off, inviting reconsideration of antagonistic pleiotropy as a key part of multi-headed balancing selection processes that enable the persistence of genetic variation.
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Soumis le : jeudi 27 février 2020 - 12:02:00
Dernière modification le : lundi 6 avril 2020 - 14:36:04

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s41467-020-14479-7.pdf
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Claire Mérot, Violaine Llaurens, Eric Normandeau, Maren Wellenreuther, Louis Bernatchez. Balancing selection via life-history trade-offs maintains an inversion polymorphism in a seaweed fly. Nature Communications, Nature Publishing Group, 2020, 11, pp.670. ⟨10.1038/s41467-020-14479-7⟩. ⟨hal-02492744⟩

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