bioRxiv preprint doi: https://doi.org/10.1101/2021.06.28.450104; this version posted June 28, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Convergent adaptation and ecological speciation result from unique genomic mechanisms in sympatric extremophile fishes Ryan Greenway1‡, Anthony P. Brown2,3, Henry Camarillo1,4, Cassandra Delich1, Kerry L. McGowan2, Joel Nelson2, Lenin Arias-Rodriguez5, Joanna L. Kelley2‡, and Michael Tobler1‡ 1 Division of Biology, Kansas State University, Manhattan, KS, USA 2 School of Biological Sciences, Washington State University, Pullman, WA, USA 3 Current address: California National Primate Research Center, University of California, Davis, Davis, CA, USA 4 Current address: Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, USA 5 División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Villahermosa, Tabasco, Mexico ‡ Corresponding authors:
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[email protected] 1 bioRxiv preprint doi: https://doi.org/10.1101/2021.06.28.450104; this version posted June 28, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. Significance Statement Divergent lineages that coexist in sympatry and are exposed to the same sources of natural selection provide a unique opportunity to study convergent evolution across levels of organization because confounding factors associated with geographic replications are eliminated. Using three sympatric lineages of livebearing fishes inhabiting toxic and adjacent nontoxic habitats, we show that the convergent evolution of phenotypic adaptation and reproductive isolation can evolve in the absence of substantial convergence at the genomic level.