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Medientyp:
E-Artikel
Titel:
Adaptive genomic divergence under high gene flow between freshwater and brackish‐water ecotypes of prickly sculpin (Cottus asper) revealed by Pool‐Seq
Beteiligte:
Dennenmoser, Stefan;
Vamosi, Steven M.;
Nolte, Arne W.;
Rogers, Sean M.
Erschienen:
Wiley, 2017
Erschienen in:Molecular Ecology
Sprache:
Englisch
DOI:
10.1111/mec.13805
ISSN:
0962-1083;
1365-294X
Entstehung:
Anmerkungen:
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>Understanding the genomic basis of adaptive divergence in the presence of gene flow remains a major challenge in evolutionary biology. In prickly sculpin (<jats:italic>Cottus asper</jats:italic>), an abundant euryhaline fish in northwestern North America, high genetic connectivity among brackish‐water (estuarine) and freshwater (tributary) habitats of coastal rivers does not preclude the build‐up of neutral genetic differentiation and emergence of different life history strategies. Because these two habitats present different osmotic niches, we predicted high genetic differentiation at known teleost candidate genes underlying salinity tolerance and osmoregulation. We applied whole‐genome sequencing of pooled DNA samples (Pool‐Seq) to explore adaptive divergence between two estuarine and two tributary habitats. Paired‐end sequence reads were mapped against genomic contigs of European <jats:italic>Cottus</jats:italic>, and the gene content of candidate regions was explored based on comparisons with the threespine stickleback genome. Genes showing signals of repeated differentiation among brackish‐water and freshwater habitats included functions such as ion transport and structural permeability in freshwater gills, which suggests that local adaptation to different osmotic niches might contribute to genomic divergence among habitats. Overall, the presence of both repeated and unique signatures of differentiation across many loci scattered throughout the genome is consistent with polygenic adaptation from standing genetic variation and locally variable selection pressures in the early stages of life history divergence.</jats:p>