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Related Experiment Videos

Delayed reproduction and fitness in variable environments.

S Tuljapurkar1

  • 1Biological Sciences, Stanford University 94305.

Proceedings of the National Academy of Sciences of the United States of America
|February 1, 1990
PubMed
Summary

Delaying reproduction can enhance fitness in unpredictable environments. This study uses stochastic demography to explain life history variations and genetic diversity in populations facing environmental uncertainty.

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Response.

Science (New York, N.Y.)·1995

Area of Science:

  • Evolutionary biology
  • Theoretical ecology
  • Population genetics

Background:

  • Organisms often delay reproduction even when not obviously adaptive in stable conditions.
  • Environmental variability is a key factor influencing life history strategies.

Purpose of the Study:

  • To investigate the adaptive significance of delayed reproduction in variable environments.
  • To analyze how environmental uncertainty shapes population structure and life history phenotypes.

Main Methods:

  • Theoretical modeling using stochastic demography.
  • Analysis of fluctuating population dynamics under environmental uncertainty.

Main Results:

  • Delayed reproduction can increase fitness in sufficiently variable environments.
  • Environmental harshness correlates with different life history phenotypes within a species.
  • Neutral coexistence of distinct life history phenotypes and maintenance of genetic polymorphisms are predicted.

Conclusions:

  • Environmental variability provides a strong selective pressure favoring delayed reproduction.
  • Life history theory must account for stochasticity to explain observed patterns in nature.
  • The study offers a framework for understanding the evolution of reproductive timing and genetic diversity.

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