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Culled males, infant mortality and reproductive success in a pre-industrial Finnish population
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Zooekologi.
2015 (Engelska)Ingår i: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 282, nr 1799Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Theoretical and empirical literature asserts that the sex ratio (i.e. M/F) at birth gauges the strength of selection in utero and cohort quality of males that survive to birth. We report the first individual-level test in humans, using detailed life-history data, of the 'culled cohort' hypothesis that males born to low annual sex ratio cohorts show lower than expected infant mortality and greater than expected lifetime reproductive success. We applied time-series and structural equation methods to a unique multi-generational dataset of a natural fertility population in nineteenth century Finland. We find that, consistent with culled cohorts, a 1 s.d. decline in the annual cohort sex ratio precedes an 8% decrease in the risk of male infant mortality. Males born to lower cohort sex ratios also successfully raised 4% more offspring to reproductive age than did males born to higher cohort sex ratios. The offspring result, however, falls just outside conventional levels of statistical significance. In historical Finland, the cohort sex ratio gauges selection against males in utero and predicts male infant mortality. The reproductive success findings, however, provide weak support for an evolutionarily adaptive explanation of male culling in utero.

Ort, förlag, år, upplaga, sidor
2015. Vol. 282, nr 1799
Nyckelord [en]
culled cohorts, male frailty, sex ratio, lifetime reproductive success, infant mortality
Nationell ämneskategori
Evolutionsbiologi
Identifikatorer
URN: urn:nbn:se:uu:diva-256555DOI: 10.1098/rspb.2014.0835ISI: 000354866500001PubMedID: 25621334OAI: oai:DiVA.org:uu-256555DiVA, id: diva2:826003
Tillgänglig från: 2015-06-24 Skapad: 2015-06-24 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Bolund, Elisabeth

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