Positive feedback in the transition from sexual reproduction to parthenogenesis.

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State: Public
Version: author
Serval ID
serval:BIB_47607C1EABBE
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Positive feedback in the transition from sexual reproduction to parthenogenesis.
Journal
Proceedings of the Royal Society B Biological Sciences
Author(s)
Schwander T., Vuilleumier S., Dubman J., Crespi B.J.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
2010
Peer-reviewed
Oui
Volume
277
Number
1686
Pages
1435-1442
Language
english
Abstract
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.
Keywords
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
Yes
Create date
16/12/2009 15:31
Last modification date
20/08/2019 13:53
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