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In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
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LABORATORY EXPERIMENTS ON SPECIATION: WHAT HAVE WE LEARNED IN 40 YEARS?

Evolution; international journal of organic evolution·2017
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REINFORCEMENT: A NEW PERSPECTIVE ON AN OLD CONTROVERSY.

Ellen E Hostert1

  • 1Biology Board, 225 Sinsheimer Labs, University of California, Santa Cruz, California, 95064.

Evolution; International Journal of Organic Evolution
|June 2, 2017
PubMed
Summary

Reinforcement models require nearly complete reproductive isolation to function. Experiments showed reinforcement only occurred with complete isolation, not incomplete isolation, highlighting a critical overlooked factor.

Keywords:
Prezygotic reproductive isolationreinforcementselection-recombination antagonismspeciation

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Reproductive isolation mechanisms

Background:

  • The reinforcement model explains how natural selection can strengthen reproductive isolation between diverging populations.
  • Theoretical predictions suggest reinforcement is most effective when postzygotic reproductive isolation is nearly complete.
  • Previous selection experiments have often overlooked the role of incomplete postzygotic reproductive isolation.

Purpose of the Study:

  • To investigate the role of varying levels of postzygotic reproductive isolation in the process of reinforcement.
  • To test whether reinforcement can occur when postzygotic reproductive isolation is incomplete.
  • To determine the minimum level of postzygotic reproductive isolation required for reinforcement.

Main Methods:

  • Experimental evolution using four treatments of postzygotic reproductive isolation: complete, strong, moderate, and none.
  • Selection experiments were conducted over 25 generations.
  • Quantification of heterotypic mating frequencies as a measure of reinforcement.

Main Results:

  • A significant reduction in heterotypic matings was observed only in the treatment with complete postzygotic reproductive isolation.
  • No evidence of reinforcement (decrease in heterotypic matings) was detected in treatments with strong, moderate, or no postzygotic reproductive isolation.
  • Incomplete postzygotic reproductive isolation did not facilitate reinforcement.

Conclusions:

  • Complete postzygotic reproductive isolation is necessary for reinforcement to occur under the tested experimental conditions.
  • Incomplete postzygotic reproductive isolation is insufficient to drive reinforcement, contrary to some interpretations of field observations.
  • The findings underscore the importance of considering the degree of reproductive isolation in evolutionary reinforcement studies.