Female-biased sex ratios in urban centers create a "fertility trap" in post-war Finland

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dc.contributor.author Pettay, Jenni E.
dc.contributor.author Lummaa, Virpi
dc.contributor.author Lynch, Robert
dc.contributor.author Loehr, John
dc.date.accessioned 2021-09-16T05:11:01Z
dc.date.available 2021-09-16T05:11:01Z
dc.date.issued 2021
dc.identifier.citation Pettay , J E , Lummaa , V , Lynch , R & Loehr , J 2021 , ' Female-biased sex ratios in urban centers create a "fertility trap" in post-war Finland ' , Behavioral Ecology , vol. 32 , no. 4 , pp. 590-598 . https://doi.org/10.1093/beheco/arab007
dc.identifier.other PURE: 168505536
dc.identifier.other PURE UUID: 6b815ca8-2393-4f62-abc6-bc126a29979a
dc.identifier.other WOS: 000692321500010
dc.identifier.uri http://hdl.handle.net/10138/334395
dc.description Correction DOI10.1093/beheco/arac030 Early Access APR 2022 Indexed 2022-05-02
dc.description.abstract Because sex ratios are a key factor regulating mating success and subsequent fitness both across and within species, there is widespread interest in how population-wide sex ratio imbalances affect marriage markets and the formation of families in human societies. Although most modern cities have more women than men and suffer from low fertility rates, the effects of female-biased sex ratios have garnered less attention than male-biased ratios. Here, we analyze how sex ratios are linked to marriages, reproductive histories, dispersal, and urbanization by taking advantage of a natural experiment in which an entire population was forcibly displaced during World War II to other local Finnish populations of varying sizes and sex ratios. Using a discrete time-event generalized linear mixed-effects model, and including factors that change across time, such as annual sex ratio, we show how sex ratios, reproduction, and migration are connected in a female-dominated environment. Young childless women migrated toward urban centers where work was available to women, and away from male-biased rural areas. In such areas where there were more females, women were less likely to start reproduction. Despite this constraint, women showed little flexibility in mate choice, with no evidence for an increase in partner age difference in female-biased areas. We propose that together these behaviors and conditions combine to generate an "urban fertility trap" which may have important consequences for our understanding of the fertility dynamics of today including the current fertility decline across the developed world. en
dc.format.extent 9
dc.language.iso eng
dc.relation.ispartof Behavioral Ecology
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject dispersal
dc.subject fertility
dc.subject mate choice
dc.subject migration
dc.subject reproduction
dc.subject sex ratio
dc.subject urbanization
dc.subject SELECTION
dc.subject ECOLOGY
dc.subject WOMEN
dc.subject 1181 Ecology, evolutionary biology
dc.title Female-biased sex ratios in urban centers create a "fertility trap" in post-war Finland en
dc.type Article
dc.contributor.organization Biological stations
dc.contributor.organization Lammi Biological Station
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1093/beheco/arab007
dc.relation.issn 1045-2249
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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