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The role of hybridization in evolution.

N H Barton1

  • 1Institute of Cell, Animal and Population Biology, University of Edinburgh, King's Buildings, Edinburgh EH9 3JT, UK. n.barton@ed.ac.uk

Molecular Ecology
|April 12, 2001
PubMed
Summary

Hybridization can impact evolution by limiting ranges or reinforcing reproductive isolation. However, certain hybrid genotypes can be fitter, contributing positively to evolution and speciation through introgression.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Speciation

Background:

  • Hybridization's evolutionary impact is complex, with potential for reduced hybrid fitness limiting ranges and reinforcing isolation.
  • Alternatively, fitter hybrid genotypes can contribute positively, facilitating allele introgression and potentially leading to new species.
  • Understanding these dynamics is crucial for evolutionary and speciation research.

Purpose of the Study:

  • To explore the evolutionary consequences of hybridization, including its effects on fitness, range, and reproductive isolation.
  • To investigate the conditions under which hybridization can contribute positively to evolution, such as through advantageous allele introgression.
  • To examine the potential for 'hybrid speciation' and its dependence on population divergence and epistasis.

Main Methods:

  • Utilized Fisher's model of stabilizing selection on multiple traits to illustrate evolutionary processes.
  • Analyzed scenarios where hybrids exhibit reduced fitness and where certain hybrid genotypes are fitter than parents.
  • Investigated the role of epistasis and population meeting dynamics in hybrid speciation.

Main Results:

  • Confirmed that while recombinant hybrids are often less fit, some gene combinations can be fitter than parental types.
  • Fisher's model predicts heterosis in diploid F1s (with additive traits), asymmetric incompatibility, and Haldane's Rule (with dominance).
  • The model's adaptation via small effect substitutions does not fully explain strong effects of single chromosome regions observed in species crosses.

Conclusions:

  • Hybridization's evolutionary role is multifaceted, ranging from limiting divergence to driving speciation.
  • Fitter hybrid genotypes and successful introgression can be significant evolutionary forces.
  • While Fisher's model provides insights, further research is needed to fully explain complex patterns like strong chromosomal effects in species crosses.

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