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Hybridization and a mixture of small and large-effect loci facilitate adaptive radiation

Rishi De-Kayne, Oliver M. Selz, David A. Marques, David Frei, Ole Seehausen, View ORCID ProfilePhiline G. D. Feulner
doi: https://doi.org/10.1101/2022.02.18.481029
Rishi De-Kayne
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
2Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Switzerland
3Institute for Evolutionary Biology, University of Edinburgh, UK
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Oliver M. Selz
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
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David A. Marques
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
2Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Switzerland
4Natural History Museum Basel, Switzerland
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David Frei
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
2Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Switzerland
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Ole Seehausen
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
2Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Switzerland
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Philine G. D. Feulner
1Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland
2Division of Aquatic Ecology and Evolution, Institute of Ecology and Evolution, University of Bern, Switzerland
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  • ORCID record for Philine G. D. Feulner
  • For correspondence: philine.feulner@eawag.ch
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Abstract

Adaptive radiations represent some of the most remarkable explosions of diversification across the tree of life. However, the constraints to rapid diversification and how they are sometimes overcome, particularly the relative roles of genetic architecture and hybridization, remain unclear. Here, we address these questions in the Alpine whitefish radiation, using a whole-genome dataset that includes multiple individuals of each of the 22 species belonging to six ecologically distinct ecomorph classes across several lake-systems. We reveal that repeated ecological and morphological diversification along a common environmental axis is associated with both genome-wide allele frequency shifts and a specific, larger effect, locus, associated with the gene edar. Additionally, we highlight the role of introgression between species from different lake-systems in facilitating the evolution and persistence of species with unique phenotypic combinations and ecology. These results highlight the role of both genome architecture and secondary contact with hybridization in fuelling adaptive radiation.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted February 20, 2022.
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Hybridization and a mixture of small and large-effect loci facilitate adaptive radiation
Rishi De-Kayne, Oliver M. Selz, David A. Marques, David Frei, Ole Seehausen, Philine G. D. Feulner
bioRxiv 2022.02.18.481029; doi: https://doi.org/10.1101/2022.02.18.481029
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Hybridization and a mixture of small and large-effect loci facilitate adaptive radiation
Rishi De-Kayne, Oliver M. Selz, David A. Marques, David Frei, Ole Seehausen, Philine G. D. Feulner
bioRxiv 2022.02.18.481029; doi: https://doi.org/10.1101/2022.02.18.481029

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