Genomic landscape of geographically structured colour polymorphism in a temperate marine fish.
assortative mating
colour vision
gradient of phenotypic and genomic differentiation
partial reproductive isolation
Journal
Molecular ecology
ISSN: 1365-294X
Titre abrégé: Mol Ecol
Pays: England
ID NLM: 9214478
Informations de publication
Date de publication:
03 2021
03 2021
Historique:
received:
18
05
2020
revised:
06
01
2021
accepted:
08
01
2021
pubmed:
18
1
2021
medline:
22
6
2021
entrez:
17
1
2021
Statut:
ppublish
Résumé
The study of phenotypic variation patterns among populations is fundamental to elucidate the drivers of evolutionary processes. Empirical evidence that supports ongoing genetic divergence associated with phenotypic variation remains very limited for marine species where larval dispersal is a common homogenizing force. We present a genome-wide analysis of a marine fish, Labrus bergylta, comprising 144 samples distributed from Norway to Spain, a large geographical area that harbours a gradient of phenotypic differentiation. We analysed 39,602 biallelic single nucleotide polymorphisms and found a clear latitudinal gradient of genomic differentiation strongly correlated with the variation in phenotypic morph frequencies observed across the North Atlantic. We also detected a strong association between the latitude and the number of loci that appear to be under divergent selection, which increased with differences in coloration but not with overall genetic differentiation. Our results demonstrate that strong reproductive isolation is occurring between sympatric colour morphs of L. bergylta found at the southern areas and provide important new insights into the genomic changes shaping early stages of differentiation that might precede speciation with gene flow.
Identifiants
pubmed: 33455028
doi: 10.1111/mec.15805
pmc: PMC7986630
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1281-1296Informations de copyright
© 2021 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.
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