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Related Experiment Videos

Complex limiting behaviour of multilocus genetic systems in cyclical environments

V M Kirzhner1, A B Korol, E Nevo

  • 1Institute of Evolution, University of Haifa, Haifa, 31905, Israel.

Journal of Theoretical Biology
|May 16, 1998
PubMed
Summary

Complex evolutionary dynamics, including supercycles and chaos, can emerge in multilocus genetic systems under cyclical selection. This finding suggests a novel mechanism for maintaining long-term genetic diversity, potentially explaining biodiversity increases over evolutionary time.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics
  • Theoretical Biology

Background:

  • Multilocus genetic systems are fundamental to understanding evolutionary processes.
  • Previous models often predict simple evolutionary trajectories under selection.
  • Cyclically varying environmental conditions can impose complex selective pressures.

Purpose of the Study:

  • To investigate the emergence of complex dynamics in multilocus systems under stabilizing selection with cyclically varying optima.
  • To explore the stability of these complex dynamics under parameter perturbations.
  • To propose a novel evolutionary mechanism for generating and maintaining genetic diversity.

Main Methods:

  • Modeling of haploid and diploid multilocus genetic systems.

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  • Inclusion of various genetic effects (additive, dominant, semidominant) and chromosomal distributions.
  • Analysis of system behavior under stabilizing selection with cyclically fluctuating environmental optima.

    • Main Results:

    • Demonstrated the emergence of complex limiting behaviors like supercycles and chaotic-like phenomena.
    • Showcased the stability of these dynamics despite parameter variations.
    • Highlighted that these complex dynamics surpass the potential of simpler selection models.

    Conclusions:

    • Cyclical selection in multilocus systems can drive complex evolutionary dynamics.
    • This complex dynamics may serve as a novel mechanism for increasing genetic diversity over extended periods.
    • This mechanism could reconcile evolutionary theory with the observed increase in biological diversity throughout geological history.