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Mating system as a barrier to gene flow.

Xin-Sheng Hu1

  • 1Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX13RB, United Kingdom. xinsheng.hu@gmail.com.

Evolution; International Journal of Organic Evolution
|April 16, 2015
PubMed
Summary
This summary is machine-generated.

Mating systems significantly impact gene flow between species. Predominant selfing creates stronger barriers to gene exchange than outcrossing, influencing speciation and species integrity in hybrid zones.

Keywords:
Hybridizationisolating barrieroutcrossingpollen flowselfingspeciation

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Mating systems are crucial reproductive isolating barriers, distinct from behavioral, ecological, or mechanical barriers.
  • Selfing promotes speciation, while outcrossing maintains species integrity.

Purpose of the Study:

  • To investigate how mating systems influence gene flow between diverging species in a hybrid zone.
  • To understand the role of selfing and outcrossing in shaping genetic exchange and speciation.

Main Methods:

  • Theoretical modeling of gene flow dynamics.
  • Analysis of genetic exchange under varying selfing rates.
  • Incorporation of linkage disequilibrium and selection.

Main Results:

  • Predominant selfing species exhibit greater barriers to selective gene flow than outcrossing species.
  • Neutral gene flow barriers show a maximum at intermediate selfing rates due to linkage disequilibrium.
  • Asymmetric gene flow occurs when neutral genes are linked to selected genes in heterogeneous environments.

Conclusions:

  • Selfing, in conjunction with physical and ecological factors, strengthens barriers to gene flow, potentially driving incipient speciation.
  • Asymmetric mating systems can explain unequal genomic mixing between closely related species in natural hybrid zones.