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Related Experiment Videos

Evolutionary approach to below replacement fertility.

Hillard Kaplan1, Jane B Lancaster, W Troy Tucker

  • 1Department of Anthropology, University of New Mexico, Albuquerque, New Mexico 87131, USA.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|March 14, 2002
PubMed
Summary
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Modern societal changes, like increased education and wealth, impact human reproductive strategies, potentially leading to below-replacement fertility rates due to delayed reproduction and smaller family sizes.

Area of Science:

  • Human evolutionary biology
  • Behavioral ecology
  • Demography

Background:

  • Human evolution is characterized by a large brain, extended juvenile period, and long lifespan, linked to skill-intensive resource acquisition.
  • Traditional fertility regulation involved psychological and physiological adjustments based on skill returns and mortality risks.
  • Somatic wealth (biological resources) historically influenced fertility via hormonal mechanisms.

Purpose of the Study:

  • To investigate how modern societal changes, particularly extra-somatic wealth, affect evolved human reproductive strategies.
  • To examine the psychological mechanisms driving parental investment in offspring quality over quantity.
  • To model the potential for below-replacement fertility resulting from these shifts.

Main Methods:

Related Experiment Videos

  • Utilized evolutionary and ecological principles to model human reproductive behavior.
  • Incorporated concepts of parental investment theory and life-history strategy.
  • Tested model predictions using data from the National Survey of Families and Households and the Albuquerque Men study.

Main Results:

  • Evolved proximate physiological mechanisms for fertility do not adequately respond to modern extra-somatic wealth.
  • Psychological shifts favor increased investment in offspring education, smaller desired family sizes, and delayed reproduction.
  • Delayed reproduction and effective birth control contribute to reduced fertility, potentially below replacement levels.

Conclusions:

  • Modern socioeconomic conditions create a mismatch with evolved reproductive psychology and physiology.
  • Shifts in parental investment towards quality over quantity, coupled with delayed reproduction, are key drivers of declining fertility rates.
  • The study provides a framework for understanding contemporary demographic trends through an evolutionary lens.