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Consequences of sex change for effective population size.

Waples, RS, Mariani, S and Benvenuto, C (2018) Consequences of sex change for effective population size. Proceedings of the Royal Society B: Biological Sciences, 285 (1893). ISSN 0962-8452

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Abstract

Sequential hermaphroditism, where males change to females (protandry) or the reverse (protogyny), is widespread in animals and plants, and can be an evolutionarily stable strategy (ESS) if fecundity rises faster with age in the second sex. Sequential hermaphrodites also generally have sex ratios skewed towards the initial sex, and standard theory based on fixed sexes indicates that this should reduce effective population size ( Ne) and increase the deleterious effects of genetic drift. We show that despite having skewed sex ratios, populations that change sex at the ESS age do not have reduced Ne compared with fixed-sex populations with an even sex ratio. This implies that the ability of individuals to operate as both male and female allows the population to avoid some evolutionary constraints imposed by fixed sexes. Furthermore, Ne would be maximized if sex change occurred at a different (generally earlier) age than is selected for at the individual level, which suggests a potential conflict between individual and group selection. We also develop a novel method to quantify the strength of selection for sex reversal.

Item Type: Article
Additional Information: Waples Robin S., Mariani Stefano and Benvenuto Chiara. Consequences of sex change for effective population size.285.Proc. R. Soc. B.
Uncontrolled Keywords: 06 Biological Sciences, 11 Medical and Health Sciences, 07 Agricultural and Veterinary Sciences
Subjects: Q Science > QH Natural history
Q Science > QH Natural history > QH426 Genetics
Divisions: Natural Sciences and Psychology
Publisher: The Royal Society
Related URLs:
Date Deposited: 08 Aug 2019 09:51
Last Modified: 08 Aug 2019 10:00
DOI or Identification number: 10.1098/rspb.2018.1702
URI: http://researchonline.ljmu.ac.uk/id/eprint/11166

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