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Reproductive isolation in a three-way contact zone.

Laura L Dean1, James R Whiting1,2, Felicity C Jones3,4

  • 1School of Life Sciences, University of Nottingham, Nottingham, UK.

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Summary
This summary is machine-generated.

This study reveals complex gene flow patterns in a three-way contact zone of three-spined stickleback. Despite hybridization, distinct genomic regions maintain reproductive isolation, suggesting chromosomal inversions play a key role.

Keywords:
adaptationcontact zonehybridintrogressionreproductive isolationspeciation

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Area of Science:

  • Evolutionary Biology
  • Speciation Genomics
  • Population Genetics

Background:

  • Contact zones between divergent populations offer insights into gene flow's role in adaptation and speciation.
  • Previous research primarily examined two-way contact zones, overlooking the complexity of multi-population interactions.
  • Understanding introgression patterns in natural settings with multiple overlapping populations is crucial.

Purpose of the Study:

  • To investigate complex patterns of divergence and introgression in a natural three-way contact zone.
  • To analyze the interplay of gene flow, hybridization, and reproductive isolation in three-spined stickleback (Gasterosteus aculeatus).

Main Methods:

  • Utilized phenotypic and genomic data to identify and characterize a three-way contact zone.
  • Employed genomic cline analyses to detect selection and hybrid incompatibilities.
  • Examined immune gene expression profiles in resident and migratory forms and their hybrids.

Main Results:

  • Confirmed a three-way contact zone involving freshwater resident, saltwater resident, and saltwater migratory stickleback.
  • Observed hybridization, primarily between saltwater resident and migratory forms, yet identified persistent genomic islands of divergence.
  • Genomic cline analyses indicated selection and/or hybrid incompatibilities in divergent regions, involving adaptive loci and chromosomal inversions.

Conclusions:

  • Reproductive isolation is maintained in this complex three-way contact zone despite ongoing hybridization.
  • Chromosomal inversions likely contribute significantly to maintaining reproductive isolation by reducing recombination.
  • Distinct immune gene expression profiles exist between forms, but hybrids do not show transgressive expression.