Investigating the extent of parallelism in morphological and genomic divergence among lake trout ecotypes in Lake Superior

Autor: Louis Bernatchez, Frederick W. Goetz, Andrew M. Muir, Pascal Sirois, Alysse Perreault‐Payette, Charles Perrier, Eric Normandeau
Přispěvatelé: Institut de Biologie Intégrative et des Systèmes [Québec] (IBIS), Michigan State University [East Lansing], Michigan State University System, Department of Fisheries and Wildlife and Department of Zoology, Michigan State University System-Michigan State University System, Northwest Fisheries Science Center (NWFSC), NOAA National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA)-National Oceanic and Atmospheric Administration (NOAA), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Université Paul-Valéry - Montpellier 3 (UPVM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut de Recherche pour le Développement (IRD [France-Sud]), Université du Québec à Chicoutimi (UQAC), This study was supported by a research grant from the Great Lakes Fisheries Commission to L. Bernatchez and AM Muir, and a research grant from Science and Engineering Research Canada (NSERC strategic grant programme) to L Bernatchez and Pascal Sirois.
Jazyk: angličtina
Rok vydání: 2017
Předmět:
Zdroj: Molecular Ecology
Molecular Ecology, Wiley, 2017, 26 (6), pp.1477-1497. ⟨10.1111/mec.14018⟩
ISSN: 0962-1083
1365-294X
DOI: 10.1111/mec.14018⟩
Popis: International audience; Understanding the emergence of species through the process of ecological speciation is a central question in evolutionary biology which also has implications for conservation and management. Lake trout (Salvelinus namaycush) is renowned for the occurrence of different ecotypes linked to resource and habitat use throughout North America. We aimed to unravel the fine genetic structure of the four lake trout ecotypes in Lake Superior. A total of 486 individuals from four sites were genotyped at 6822 filtered SNPs using RADseq technology. Our results revealed different extent of morphological and genetic differentiation within the different sites. Overall, genetic differentiation was weak but significant and was on average three times higher between sites (mean F-ST=0.016) than between ecotypes within sites (mean F-ST=0.005) indicating higher level of gene flow or a more recent shared ancestor between ecotypes within each site than between populations of the same ecotype. Evidence of divergent selection was also found between ecotypes and/or in association with morphological variation. Outlier loci found in genes related to lipid metabolism and visual acuity were of particular interest in this context of ecotypic divergence. However, we did not find clear indication of parallelism at the genomic level, despite the presence of phenotypic parallelism among some ecotypes from different sampling sites. Overall, the occurrence of different levels of both genomic and phenotypic differentiation between ecotypes within each site with several differentiated loci linked to relevant biological functions supports the presence of a continuum of divergence in lake trout.
Databáze: OpenAIRE
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