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Frequency-dependent female genital cutting behaviour confers evolutionary fitness benefits

Research output: Contribution to journalArticle

Original languageEnglish
Article number49
Number of pages6
JournalNature Ecology and Evolution
Volume1
DOIs
DateAccepted/In press - 9 Dec 2016
DatePublished (current) - 6 Feb 2017

Abstract

Female genital cutting (FGC) has immediate and long-term negative health consequences that are well-documented, and its elimination is a priority for policy makers. The persistence of this widespread practice also presents a puzzle for evolutionary anthropologists due to its potentially detrimental impact on survival and reproductive fitness. Using multilevel modelling on Demographic Health Survey (DHS) datasets from 5 West African countries, here we show that FGC behaviour is frequency-dependent; the probability that girls are cut varies in proportion to the FGC frequency found in their ethnic group. We also show for the first time that this frequency-dependent behaviour is adaptive in evolutionary fitness terms; in ethnic groups with high FGC frequency women with FGC have significantly more surviving offspring than their uncut peers and the reverse is found in ethnic groups with low FGC frequency. Our results demonstrate how evolutionary and cultural forces can drive the persistence of harmful behaviours.

    Research areas

  • Behavioural ecology, Biological anthropology, Cultural evolution, Developing world, Evolutionary theory

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Nature at http://www.nature.com/articles/s41559-016-0049. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 703 KB, PDF document

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