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Simulated coevolution in a mutating ecology.

J S Sá Martins1

  • 1Colorado Center for Chaos and Complexity, University of Colorado, Boulder 80309, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 25, 2000
PubMed
Summary

Sexual reproduction prevails when parasites rapidly mutate, supporting the Red Queen hypothesis. Asexual populations die out in stable environments, but sexual reproduction offers an evolutionary advantage against evolving threats.

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Area of Science:

  • Evolutionary biology
  • Theoretical ecology
  • Computational biology

Background:

  • The evolution of sexual reproduction remains a key question in biology.
  • Asexual reproduction is generally more efficient but may lack long-term adaptive advantages.
  • The Red Queen hypothesis proposes that sexual reproduction provides an advantage in co-evolutionary arms races.

Purpose of the Study:

  • To simulate the evolutionary dynamics between sexual and asexual populations.
  • To investigate the role of parasites in favoring sexual reproduction.
  • To test the predictions of the Red Queen hypothesis using a computational model.

Main Methods:

  • Utilized the bit-string Penna model for agent-based simulation.
  • Modeled competition between asexual and sexual populations in a shared environment.
  • Introduced a parasite infestation with rapid genetic mutation and coupling.

Main Results:

  • In stable environments, the asexual population outcompeted and eliminated the sexual population.
  • The introduction of rapidly mutating parasites led to the prevalence of sexual reproduction.
  • The model demonstrated that genetic coupling with parasites favors sexual reproduction.

Conclusions:

  • Sexual reproduction provides a significant evolutionary advantage against rapidly evolving parasites.
  • The Penna model supports the Red Queen hypothesis regarding the evolution of sex.
  • Parasite-driven selection pressures can maintain sexual reproduction in a population.

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