September 22, 2019  |  

Genomics of habitat choice and adaptive evolution in a deep-sea fish.

Authors: Gaither, Michelle R and Gkafas, Georgios A and de Jong, Menno and Sarigol, Fatih and Neat, Francis and Regnier, Thomas and Moore, Daniel and Gr?cke, Darren R and Hall, Neil and Liu, Xuan and Kenny, John and Lucaci, Anita and Hughes, Margaret and Haldenby, Sam and Hoelzel, A Rus

Intraspecific diversity promotes evolutionary change, and when partitioned among geographic regions or habitats can form the basis for speciation. Marine species live in an environment that can provide as much scope for diversification in the vertical as in the horizontal dimension. Understanding the relevant mechanisms will contribute significantly to our understanding of eco-evolutionary processes and effective biodiversity conservation. Here, we provide an annotated genome assembly for the deep-sea fish Coryphaenoides rupestris and re-sequencing data to show that differentiation at non-synonymous sites in functional loci distinguishes individuals living at different depths, independent of horizontal spatial distance. Our data indicate disruptive selection at these loci; however, we find no clear evidence for differentiation at neutral loci that may indicate assortative mating. We propose that individuals with distinct genotypes at relevant loci segregate by depth as they mature (supported by survey data), which may be associated with ecotype differentiation linked to distinct phenotypic requirements at different depths.

Journal: Nature ecology & evolution
DOI: 10.1038/s41559-018-0482-x
Year: 2018

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