On the maintenance of sex-chromosome polymorphism by sex-antagonistic selection

Détails

ID Serval
serval:BIB_16087D661A53
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
On the maintenance of sex-chromosome polymorphism by sex-antagonistic selection
Périodique
American Naturalist
Auteur(s)
Blaser O., Neuenschwander S., Perrin N.
ISSN
1537-5323 (Electronic)
ISSN-L
0003-0147 (Linking)
Statut éditorial
Publié
Date de publication
2011
Peer-reviewed
Oui
Volume
178
Numéro
4
Pages
515-524
Langue
anglais
Résumé
Complex sex-determination systems are a priori unstable and require specific selective forces for their maintenance. Analytical derivations have suggested that sex-antagonistic selection may play such a role, but this assumed absence of recombination between the sex-determining and sex-antagonistic genes. Using individual-based simulations, and focusing on the sex chromosome and coloration polymorphisms of platy fishes as a case study, we show that the conditions for polymorphism maintenance induce female-biases in primary sex ratios, so that sex-ratio selection makes the system collapse towards male- or female heterogamety as soon as recombinant genotypes appear. However, a polymorphism can still be maintained under scenarios comprising strong sexual selection against dull males, mild natural selection against bright females, and low recombination rates. Though such conditions are plausibly met in natural populations of fishes harbouring such polymorphisms, quantitative empirical evaluations are required to properly test whether sex-antagonistic selection is a causal agent, or if other selective processes are required (such as local mate competition favouring female biased sex ratios).
Mots-clé
sex chromosomes, sex-antagonistic selection, sexual selection, color polymorphism, recombination, sex ratio selection, teleost fishes
Pubmed
Web of science
Création de la notice
19/05/2011 9:40
Dernière modification de la notice
03/03/2018 14:11
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