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  Adaptive genomic divergence under high gene flow between freshwater and brackish-water ecotypes of prickly sculpin (Cottus asper) revealed by Pool-Seq

Dennenmoser, S., Vamosi, S. M., Nolte, A. W., & Rogers, S. M. (2017). Adaptive genomic divergence under high gene flow between freshwater and brackish-water ecotypes of prickly sculpin (Cottus asper) revealed by Pool-Seq. Molecular Ecology, 26, 25-42. doi:10.1111/mec.13805.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-3AF2-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-1EFE-9
Genre: Journal Article

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Dennenmoser, Stefan1, Author              
Vamosi, Steven M., Author
Nolte, Arne W.1, Author              
Rogers, Sean M., Author
Affiliations:
1Research Group Evolutionary Genetics of Fishes, Department Evolutionary Genetics, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445645              

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Free keywords: Pool-Seq; adaptation; amphidromy; atp1a1a; salinity genes; whole-genome scan
 Abstract: Understanding the genomic basis of adaptive divergence in the presence of gene flow remains a major challenge in evolutionary biology. In prickly sculpin (Cottus asper), 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 Cottus, 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. © 2016 John Wiley Sons Ltd.

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Language(s): eng - English
 Dates: 2016-07-292016-01-152016-08-112016-09-122017
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1111/mec.13805
BibTex Citekey: Dennenmoser2016
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Title: Molecular Ecology
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 26 Sequence Number: - Start / End Page: 25 - 42 Identifier: ISSN: 0962-1083
CoNE: /journals/resource/954925580119