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Cline coupling and uncoupling in a stickleback hybrid zone

View ORCID ProfileTim Vines, View ORCID ProfileAnne Dalziel, View ORCID ProfileArianne Albert, View ORCID ProfileThor Veen, View ORCID ProfilePatricia Schulte, View ORCID ProfileDolph Schluter
doi: https://doi.org/10.1101/016832
Tim Vines
Biodiversity Research Centre, University of British Columbia, 6270 University Blvd Vancouver BC, Canada, V6T 1Z4. Molecular Ecology Editorial Office, 6270 University Blvd Vancouver BC, Canada, V6T 1Z4.
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Anne Dalziel
Department of Biology, Université Laval, 1030 Avenue de la Médecine, Laval, QC, Canada, G1V 0A6
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Arianne Albert
Women’s Health Research Institute, 4500 Oak Street, Vancouver, BC, Canada V6H 3N1
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Thor Veen
Integrative Biology, University of Texas at Austin, One University Station C0990, Austin, TX 78712, USA
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Patricia Schulte
Biodiversity Research Centre, University of British Columbia, 6270 University Blvd Vancouver BC, Canada, V6T 1Z4.
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Dolph Schluter
Biodiversity Research Centre, University of British Columbia, 6270 University Blvd Vancouver BC, Canada, V6T 1Z4.
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Abstract

Strong ecological selection on a genetic locus can maintain allele frequency differences between populations in different environments, even in the face of hybridization. When alleles at divergent loci come into tight linkage disequilibria, selection acts on them as a unit and can significantly reduce gene flow. For populations interbreeding across a hybrid zone, linkage disequilibria between loci can force clines to share the same slopes and centers. However, strong ecological selection can push clines away from the others, reducing linkage disequilibria and weakening the barrier to gene flow. We looked for this ‘cline uncoupling’ effect in a hybrid zone between stream resident and anadromous sticklebacks at two genes known to be under divergent natural selection (Eda and ATP1a1) and five morphological traits that repeatedly evolve in freshwater stickleback. We used 10 anonymous SNPs to characterize the shape of the zone. We found that the clines at Eda, ATP1a1, and four morphological traits were concordant and coincident, suggesting that direct selection on each is outweighed by the indirect selection generated by linkage disequilibria. Interestingly, the cline for pectoral fin length was much steeper and displaced 200m downstream, and two anonymous SNPs also had steep clines.

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Posted March 22, 2015.
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Cline coupling and uncoupling in a stickleback hybrid zone
Tim Vines, Anne Dalziel, Arianne Albert, Thor Veen, Patricia Schulte, Dolph Schluter
bioRxiv 016832; doi: https://doi.org/10.1101/016832
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Cline coupling and uncoupling in a stickleback hybrid zone
Tim Vines, Anne Dalziel, Arianne Albert, Thor Veen, Patricia Schulte, Dolph Schluter
bioRxiv 016832; doi: https://doi.org/10.1101/016832

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