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Related Experiment Videos

[Evolution and selection of reproduction].

Jean-Marie Legay1, Annie Heizmann

  • 1Laboratoire de biométrie et biologie évolutive, UMR 5558, université Claude-Bernard, Lyon-1, 43, bd du 11-Novembre-1918, 69622 Villeurbanne, France. misou@biomserv.univ-lyon1.fr

Comptes Rendus Biologies
|October 4, 2002
PubMed
Summary
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Oecologia·2017
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Twinning rates in Artas, France (1540-1900) averaged 11 per 1000 births, showing variability but no significant decline. Twinning is linked to maternal longevity and family size, despite higher infant mortality for twins.

Area of Science:

  • Demography
  • Reproductive Biology
  • Historical Epidemiology

Context:

  • Analysis of historical parish records from Artas, Isère (France) spanning 1540-1900.
  • Provides a nearly continuous dataset for studying reproductive patterns over four centuries.

Purpose:

  • To investigate the frequency, evolution, and determinants of twinning.
  • To explore the relationship between twinning and other reproductive characteristics, including maternal age, parity, and mortality.
  • To assess the genetic and environmental factors influencing twinning rates.

Summary:

  • The twinning rate in Artas averaged approximately 11 per 1000 births, with significant inter-annual and inter-decadal variability.
  • While a slight decrease may be suggested, statistical analysis did not reject the null hypothesis for a significant trend.

Related Experiment Videos

  • Twinning demonstrated a partial genetic component, with higher fecundity and maternal longevity observed in families with twins.
  • Conversely, twins experienced substantially higher perinatal and infant mortality, leading to a lower percentage of 'useful' children.

    • Impact:

    • Highlights the complex interplay of selection and counter-selection in reproductive patterns.
    • Suggests that compensations between these processes may explain the relatively stable twinning rate over the observed period.
    • Provides insights into long-term demographic trends and the biological factors influencing human reproduction.