SELECTION FOR INCREASED BROOD SIZE IN HISTORICAL HUMAN POPULATIONS

@article{Helle2004SELECTIONFI,
  title={SELECTION FOR INCREASED BROOD SIZE IN HISTORICAL HUMAN POPULATIONS},
  author={Samuli Helle and Virpi Lummaa and Jukka Jokela},
  journal={Evolution},
  year={2004},
  volume={58}
}
Abstract Human twinning rates are considered to either reflect the direct fitness effects of twinning in variable environments, or to be a maladaptive by‐product of selection for other maternal reproductive traits (e.g., polyovulation). We used historical data (1710‐1890) of Sami populations from Northern Scandinavia to contrast these alternative hypotheses. We found that women who produced twins started their reproduction younger, ceased it later, had higher lifetime fecundity, raised more… Expand
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From the largest historical sample of twinning mothers yet published, it is concluded that bearing twins is more likely for those with a robust phenotype and is a useful index of maternal heterogeneity. Expand
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From the largest historical sample of twinning mothers yet published, it is concluded that bearing twins is more likely for those with a robust phenotype and is a useful index of maternal heterogeneity. Expand
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The results suggest that reproductive and somatic senescence may have been coupled in these human populations, and that selection could have favoured late reproduction in historical post-reproductive Sami women. Expand
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  • Proceedings of the National Academy of Sciences of the United States of America
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Examination of reproductive effort in women born in preindustrial Finland between 1702 and 1859 found that mothers delivering twins had reduced postreproductive survival after age 65, and the mechanism mediating this cost might have been accelerated immunosenescence. Expand
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The results show that the amount of wealth affected the selection pressure on female life-history in a pre-industrial human population, and the poorest women had the lowest age-specific survival throughout their lives and had lower fitness compared to the wealthier women. Expand
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Comparing the survival outcomes for the siblings of twins
150 words max) We have shown that twinning is a marker of a robust maternal phenotype. Here we examine mortality patterns of the singleton offspring of mothers of twins compared to the offspring ofExpand
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References

SHOWING 1-10 OF 43 REFERENCES
Human longevity and early reproduction in pre‐industrial Sami populations
TLDR
An alternative point of view is discussed suggesting that less intense selection for early reproduction, extended parental care, and social structure allowing kin selection through the effects of close relatives are factors that have selected for the long post‐reproductive life span in humans. Expand
Why are Twins so Rare in Homo sapiens?
TLDR
An analysis of demographic factors assumed to determine brood size is presented and the profitabilities of deliveries producing the usual number, one, with those producing two are compared. Expand
Natural selection on age–specific fertilities in human females: comparison of individual–level fitness measures
  • P. Käär, J. Jokela
  • Biology, Medicine
  • Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 1998
TLDR
This work measured phenotypic selection on age–specific fertilities in three pre–modern human populations using individually estimated finite rate of increase, er (λ), and found that λ and lifetime reproductive success ranked individuals differently according to their fitness: for example, a female giving birth to four children at a young age may actually have a higher fitness than a femaleGiving birth to six children at greater age. Expand
Gender difference in benefits of twinning in pre‐industrial humans: boys did not pay
TLDR
The results show that increases in litter size and variability of food conditions increased male mortality, and high female twin survival in the archipelago led to higher fitness of twinning mothers in relation to mothers with only singletons. Expand
Fitness of twinning.
TLDR
The question of to what extent the birth of twins contributed to the reproductive fitness of their mothers was pursued, and mothers of twins achieved greater reproductive success, with 13.5% more live-born grandchildren, than mothers of singletons only. Expand
Natural selection on human twinning
TLDR
It is found that lifetime reproductive success is maximized by having twins on the archipelago, but by having singleton offspring on the mainland, consistent with the difference in twinning rate being maintained by natural selection. Expand
Fitness, reproduction and longevity among European aristocratic and rural Finnish families in the 1700s and 1800s
  • H. Korpelainen
  • Biology, Medicine
  • Proceedings of the Royal Society of London. Series B: Biological Sciences
  • 2000
TLDR
Longevity was found to influence reproduction and fitness more than socio–economic group or birth cohort, and the reproductive efficacy and fitness of women increased along with their life span, but reproductive success and fitness were lower among women with the longest life span. Expand
Direct and correlative phenotypic selection on life-history traits in three pre-industrial human populations
TLDR
The authors' results indicate substantial differences among the sexes in the force of phenotypic selection on key life- history traits, suggesting that among-population variation in life-history traits may have been a response to the environmental variation. Expand
Differential fertility of mothers of twins and mothers of singletons: study in Limon, Costa Rica.
TLDR
In this sample mothers of twins have a higher fertility at the end of their reproductive career, and their selection coefficient indicates that natural selection favors them through differential fertility. Expand
CONDITION, GENOTYPE‐BY‐ENVIRONMENT INTERACTION, AND CORRELATIONAL SELECTION IN LIZARD LIFE‐HISTORY MORPHS
TLDR
Important interactive effects such as genotype‐by‐environment interaction toward the social environment and morph‐specific trade‐offs as well as the occurrence of correlational selection are revealed. Expand
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5
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