Phylogenomics uncovers early hybridization and adaptive loci shaping the radiation of Lake Tanganyika cichlid fishes

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2018
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Koblmüller, Stephan
Fischer, Christoph
Lemmon, Alan R.
Sturmbauer, Christian
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European Union (EU): 293700
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Comparative genomics of parallel in repeated adaptive radiations (GenAdap)
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Nature communications. 2018, 9, 3159. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-05479-9
Zusammenfassung

Lake Tanganyika is the oldest and phenotypically most diverse of the three East African cichlid fish adaptive radiations. It is also the cradle for the younger parallel haplochromine cichlid radiations in Lakes Malawi and Victoria. Despite its evolutionary significance, the relationships among the main Lake Tanganyika lineages remained unresolved, as did the general timescale of cichlid evolution. Here, we disentangle the deep phylogenetic structure of the Lake Tanganyika radiation using anchored phylogenomics and uncover hybridization at its base, as well as early in the haplochromine radiation. This suggests that hybridization might have facilitated these speciation bursts. Time-calibrated trees support that the radiation of Tanganyika cichlids coincided with lake formation and that Gondwanan vicariance concurred with the earliest splits in the cichlid family tree. Genes linked to key innovations show signals of introgression or positive selection following colonization of lake habitats and species' dietary adaptations are revealed as major drivers of colour vision evolution. These findings shed light onto the processes shaping the evolution of adaptive radiations.

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570 Biowissenschaften, Biologie
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Adaptive radiation, Molecular evolution, Phylogenetics, Phylogeny
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ISO 690IRISARRI, Iker, Pooja SINGH, Stephan KOBLMÜLLER, Julián TORRES-DOWDALL, Frederico HENNING, Paolo FRANCHINI, Christoph FISCHER, Alan R. LEMMON, Christian STURMBAUER, Axel MEYER, 2018. Phylogenomics uncovers early hybridization and adaptive loci shaping the radiation of Lake Tanganyika cichlid fishes. In: Nature communications. 2018, 9, 3159. eISSN 2041-1723. Available under: doi: 10.1038/s41467-018-05479-9
BibTex
@article{Irisarri2018-08-08Phylo-43095,
  year={2018},
  doi={10.1038/s41467-018-05479-9},
  title={Phylogenomics uncovers early hybridization and adaptive loci shaping the radiation of Lake Tanganyika cichlid fishes},
  volume={9},
  journal={Nature communications},
  author={Irisarri, Iker and Singh, Pooja and Koblmüller, Stephan and Torres-Dowdall, Julián and Henning, Frederico and Franchini, Paolo and Fischer, Christoph and Lemmon, Alan R. and Sturmbauer, Christian and Meyer, Axel},
  note={Article Number: 3159}
}
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