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Inbred women in a small and isolated Swiss village have fewer children
Article first published online: 12 MAY 2010
DOI: 10.1111/j.1420-9101.2010.02013.x
© 2010 The Authors. Journal Compilation © 2010 European Society For Evolutionary Biology
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How to Cite
POSTMA, E., MARTINI, L. and MARTINI, P. (2010), Inbred women in a small and isolated Swiss village have fewer children. Journal of Evolutionary Biology, 23: 1468–1474. doi: 10.1111/j.1420-9101.2010.02013.x
Publication History
- Issue published online: 23 JUN 2010
- Article first published online: 12 MAY 2010
- Received 29 December 2009; revised 18 March 2010; accepted 6 April 2010
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Keywords:
- consanguinity;
- family size;
- humans;
- inbreeding;
- inbreeding depression;
- isolated populations;
- maternal effect;
- reproduction;
- Switzerland
Abstract
Despite overwhelming evidence for a negative effect of inbreeding on fitness in plants and nonhuman animals, the exact nature of its effect in humans remains subject to debate. To obtain a better understanding of the effects of inbreeding on reproductive success in humans, we reconstructed the genealogies of the current inhabitants of a small and isolated Swiss village and used these to estimate the level of inbreeding of both members of all married couples, as well as their relatedness (i.e. the level of inbreeding of their offspring). Although there was no effect of parental relatedness on the number of children a couple had, we found that inbred mothers, but not inbred fathers, had significantly fewer children. Thus, although related couples did not have fewer children themselves, their inbred daughters did leave them with fewer grandchildren. Thereby, we provide evidence for the existence of inbreeding depression in human fertility, also in relatively outbred and egalitarian communities.