Positive feedback in the transition from sexual reproduction to parthenogenesis.

Détails

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Etat: Serval
Version: de l'auteur
ID Serval
serval:BIB_47607C1EABBE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Positive feedback in the transition from sexual reproduction to parthenogenesis.
Périodique
Proceedings of the Royal Society B Biological Sciences
Auteur(s)
Schwander T., Vuilleumier S., Dubman J., Crespi B.J.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
2010
Peer-reviewed
Oui
Volume
277
Numéro
1686
Pages
1435-1442
Langue
anglais
Résumé
Understanding how new phenotypes evolve is challenging because intermediate stages in transitions from ancestral to derived phenotypes often remain elusive. Here we describe and evaluate a new mechanism facilitating the transition from sexual reproduction to parthenogenesis. In many sexually reproducing species, a small proportion of unfertilized eggs can hatch spontaneously ('tychoparthenogenesis') and develop into females. Using an analytical model, we show that if females are mate-limited, tychoparthenogenesis can result in the loss of males through a positive feedback mechanism whereby tychoparthenogenesis generates female-biased sex ratios and increasing mate limitation. As a result, the strength of selection for tychoparthenogenesis increases in concert with the proportion of tychoparthenogenetic offspring in the sexual population. We then tested the hypothesis that mate limitation selects for tychoparthenogenesis and generates female-biased sex ratios, using data from natural populations of sexually reproducing Timema stick insects. Across 41 populations, both the tychoparthenogenesis rates and the proportions of females increased exponentially as the density of individuals decreased, consistent with the idea that low densities of individuals result in mate limitation and selection for reproductive insurance through tychoparthenogenesis. Our model and data from Timema populations provide evidence for a simple mechanism through which parthenogenesis can evolve rapidly in a sexual population.
Mots-clé
Animals, Biological Evolution, Female, Insects/genetics, Insects/physiology, Male, Oviposition, Ovum/physiology, Parthenogenesis/genetics, Parthenogenesis/physiology, Population Density, Reproduction/physiology, Sexual Behavior, Animal
Pubmed
Web of science
Open Access
Oui
Création de la notice
16/12/2009 16:31
Dernière modification de la notice
08/05/2019 18:00
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