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Dangosydd eitem ddigidol (DOI)

  • Milan Malinsky
    Wellcome Sanger Institute, Cambridge, UK
  • Hannes Svardal
    Wellcome Sanger Institute, Cambridge, UK
  • Alexandra Tyers
  • Eric.A. Miska
    Wellcome Sanger Institute, Cambridge, UK
  • Martin J. Genner
    University of Bristol
  • George Turner
  • Richard Durbin
    Wellcome Sanger Institute, Cambridge, UK
The hundreds of cichlid fish species in Lake Malawi constitute the most extensive recent vertebrate adaptive radiation. Here we characterize its genomic diversity by sequencing 134 individuals covering 73 species across all major lineages. The average sequence divergence between species pairs is only 0.1–0.25%. These divergence values overlap diversity within species, with 82% of heterozygosity shared between species. Phylogenetic analyses suggest that diversification initially proceeded by serial branching from a generalist Astatotilapia-like ancestor. However, no single species tree adequately represents all species relationships, with evidence for substantial gene flow at multiple times. Common signatures of selection on visual and oxygen transport genes shared by distantly related deep-water species point to both adaptive introgression and independent selection. These findings enhance our understanding of genomic processes underlying rapid species diversification, and provide a platform for future genetic analysis of the Malawi radiation.
Iaith wreiddiolSaesneg
Tudalennau (o-i)1940-1955
CyfnodolynNature Ecology and Evolution
Cyfrol2
Dyddiad ar-lein cynnar19 Tach 2018
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Rhag 2018

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