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Gérard K., Roby C., Bierne N., Borsa Philippe, Feral J. P., Chenuil A. (2015). Does natural selection explain the fine scale genetic structure at the nuclear exon Glu-5 ' in blue mussels from Kerguelen ?. Ecology and Evolution, 5 (7), 1456-1473. ISSN 2045-7758

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Lien direct chez l'éditeur doi:10.1002/ece3.1421

Titre
Does natural selection explain the fine scale genetic structure at the nuclear exon Glu-5 ' in blue mussels from Kerguelen ?
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000352560000009
AuteursGérard K., Roby C., Bierne N., Borsa Philippe, Feral J. P., Chenuil A.
SourceEcology and Evolution, 2015, 5 (7), p. 1456-1473. ISSN 2045-7758
RésuméThe Kerguelen archipelago, isolated in the Southern Ocean, shelters a blue mussel Mytilus metapopulation far from any influence of continental populations or any known hybrid zone. The finely carved coast leads to a highly heterogeneous habitat. We investigated the impact of the environment on the genetic structure in those Kerguelen blue mussels by relating allele frequencies to habitat descriptors. A total sample comprising up to 2248 individuals from 35 locations was characterized using two nuclear markers, mac-1 and Glu-5, and a mitochondrial marker (COI). The frequency data from 9 allozyme loci in 9 of these locations were also reanalyzed. Two other nuclear markers (EFbis and EFprem's) were monomorphic. Compared to Northern Hemisphere populations, polymorphism in Kerguelen blue mussels was lower for all markers except for the exon Glu-5. At Glu-5, genetic differences were observed between samples from distinct regions (F-CT=0.077), as well as within two regions, including between samples separated by <500m. No significant differentiation was observed in the AMOVA analyses at the two other markers (mac-1 and COI). Like mac-1, all allozyme loci genotyped in a previous publication, displayed lower differentiation (Jost's D) and F-ST values than Glu-5. Power simulations and confidence intervals support that Glu-5 displays significantly higher differentiation than the other loci (except a single allozyme for which confidence intervals overlap). AMOVA analyses revealed significant effects of the giant kelp Macrocystis and wave exposure on this marker. We discuss the influence of hydrological conditions on the genetic differentiation among regions. In marine organisms with high fecundity and high dispersal potential, gene flow tends to erase differentiation, but this study showed significant differentiation at very small distance. This may be explained by the particular hydrology and the carved coastline of the Kerguelen archipelago, together with spatially variable selection at Glu-5.
Plan de classementEcologie, systèmes aquatiques [036] ; Limnologie biologique / Océanographie biologique [034] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.KERGUELEN ; OCEAN AUSTRAL
LocalisationFonds IRD [F B010064111]
Identifiant IRDfdi:010064111
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010064111

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