Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/22913
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Early-life reproduction is associated with increased mortality risk but enhanced lifetime fitness in pre-industrial humans
Authors: Hayward, Adam
Nenko, Ilona
Lummaa, Virpi
Contact Email: adam.hayward@stir.ac.uk
Issue Date: 4-Mar-2015
Publisher: The Royal Society
Citation: Hayward A, Nenko I & Lummaa V (2015) Early-life reproduction is associated with increased mortality risk but enhanced lifetime fitness in pre-industrial humans, Proceedings of the Royal Society of Edinburgh. Section B: Biology, 282 (1804), Art. No.: 20143053.
Abstract: The physiology of reproductive senescence in women is well understood, but the drivers of variation in senescence rates are less so. Evolutionary theory predicts that early-life investment in reproduction should be favoured by selection at the cost of reduced survival and faster reproductive senescence. We tested this hypothesis using data collected from preindustrial Finnish church records. Reproductive success increased up to age 25 and was relatively stable until a decline from age 41. Women with higher early-life fecundity (ELF; producing more children before age 25) subsequently had higher mortality risk, but high ELF was not associated with accelerated senescence in annual breeding success. However, women with higher ELF experienced faster senescence in offspring survival. Despite these apparent costs, ELF was under positive selection: individuals with higher ELF had higher lifetime reproductive success. These results are consistent with previous observations in both humans and wild vertebrates that more births and earlier onset of reproduction are associated with reduced survival, and with evolutionary theory predicting trade-offs between early reproduction and later-life survival. The results are particularly significant given recent increases in maternal ages in many societies and the potential consequences for offspring health and fitness.
Type: Journal Article
URI: http://hdl.handle.net/1893/22913
DOI Link: http://dx.doi.org/10.1098/rspb.2014.3053
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Biological and Environmental Sciences
University of Sheffield
University of Sheffield

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