Genetic admixture of burbot (Teleostei: Lota lota) in Lake Constance from two European glacial refugia
Identifieur interne : 000858 ( Main/Exploration ); précédent : 000857; suivant : 000859Genetic admixture of burbot (Teleostei: Lota lota) in Lake Constance from two European glacial refugia
Auteurs : Marta Barluenga [Allemagne] ; Matthias Sanetra [Allemagne] ; Axel Meyer [Allemagne]Source :
- Molecular Ecology [ 0962-1083 ] ; 2006-10.
Descripteurs français
- KwdFr :
- ADN mitochondrial (composition chimique), Animaux (MeSH), Couche de glace (MeSH), Eau douce (MeSH), Europe (MeSH), Flux des gènes (MeSH), Gadiformes (classification), Gadiformes (génétique), Géographie (MeSH), Haplotypes (MeSH), Phylogenèse (MeSH), Polymorphisme génétique (MeSH), Répétitions microsatellites (MeSH), Évolution moléculaire (MeSH).
- MESH :
- composition chimique : ADN mitochondrial, Gadiformes.
- génétique : Gadiformes.
- Animaux, Couche de glace, Eau douce, Europe, Flux des gènes, Géographie, Haplotypes, Phylogenèse, Polymorphisme génétique, Répétitions microsatellites, Évolution moléculaire.
English descriptors
- KwdEn :
- Animals (MeSH), DNA, Mitochondrial (chemistry), Europe (MeSH), Evolution, Molecular (MeSH), Fresh Water (MeSH), Gadiformes (classification), Gadiformes (genetics), Gene Flow (MeSH), Geography (MeSH), Haplotypes (MeSH), Ice Cover (MeSH), Microsatellite Repeats (MeSH), Phylogeny (MeSH), Polymorphism, Genetic (MeSH), freshwater fish, microsatellites, mitochondrial DNA, panmixia, population genetics, postglacial colonization.
- MESH :
- chemical , chemistry : DNA, Mitochondrial.
- geographic : Europe.
- classification : Gadiformes.
- genetics : Gadiformes.
- Animals, Evolution, Molecular, Fresh Water, Gene Flow, Geography, Haplotypes, Ice Cover, Microsatellite Repeats, Phylogeny, Polymorphism, Genetic.
Abstract
The burbot, Lota lota, is the only freshwater species of the codfish family and has a Holarctic distribution. Pleistocene glaciations caused significant geographical differentiation in the past, but its life history characterized by winter spawning migrations over large distances is likely to homogenize populations by contemporary gene flow. We investigated the population genetic structure of 541 burbots from Lake Constance and adjacent Rhine and Danube tributaries in Europe using the entire mitochondrial DNA (mtDNA) control region and 11 microsatellites. Microsatellites revealed considerable population divergence (FST = 0.26) and evidenced recent bottlenecks in two Central European rivers. In accordance to previous evidence two main phylogeographic lineages (Atlantic and Danubian) were found co‐occurring at similar frequencies in Lake Constance, where they currently undergo random mating as indicated by microsatellites. The Danubian lineage contributed only a small proportion to the lake's mtDNA diversity, and probably expanded within the lake shortly after its formation ∼10 000–15 000 bp. The larger Atlantic haplotype diversity suggested a population expansion older than the lake itself. Levels of admixture at microsatellite loci were less obvious due to their high variability, and coalescence methods were used to estimate past admixture proportions. Our results reinforce a model of a two‐step colonization of Europe by burbot from an ancestral Danubian refuge, and confirm the persistence of a secondary Atlantic refuge, as proposed to exist for other freshwater fish. We conclude that the present‐day burbot population in Lake Constance bears the genetic signature of both contemporary gene flow and historical separation events.
Url:
DOI: 10.1111/j.1365-294X.2006.03045.x
Affiliations:
- Allemagne
- Bade-Wurtemberg, District de Fribourg-en-Brisgau
- Constance (Allemagne)
- Université de Constance
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Le document en format XML
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<term>Gadiformes (genetics)</term>
<term>Gene Flow (MeSH)</term>
<term>Geography (MeSH)</term>
<term>Haplotypes (MeSH)</term>
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<term>Phylogeny (MeSH)</term>
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<term>Microsatellite Repeats</term>
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<term>Haplotypes</term>
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<front><div type="abstract" xml:lang="en">The burbot, Lota lota, is the only freshwater species of the codfish family and has a Holarctic distribution. Pleistocene glaciations caused significant geographical differentiation in the past, but its life history characterized by winter spawning migrations over large distances is likely to homogenize populations by contemporary gene flow. We investigated the population genetic structure of 541 burbots from Lake Constance and adjacent Rhine and Danube tributaries in Europe using the entire mitochondrial DNA (mtDNA) control region and 11 microsatellites. Microsatellites revealed considerable population divergence (FST = 0.26) and evidenced recent bottlenecks in two Central European rivers. In accordance to previous evidence two main phylogeographic lineages (Atlantic and Danubian) were found co‐occurring at similar frequencies in Lake Constance, where they currently undergo random mating as indicated by microsatellites. The Danubian lineage contributed only a small proportion to the lake's mtDNA diversity, and probably expanded within the lake shortly after its formation ∼10 000–15 000 bp. The larger Atlantic haplotype diversity suggested a population expansion older than the lake itself. Levels of admixture at microsatellite loci were less obvious due to their high variability, and coalescence methods were used to estimate past admixture proportions. Our results reinforce a model of a two‐step colonization of Europe by burbot from an ancestral Danubian refuge, and confirm the persistence of a secondary Atlantic refuge, as proposed to exist for other freshwater fish. We conclude that the present‐day burbot population in Lake Constance bears the genetic signature of both contemporary gene flow and historical separation events.</div>
</front>
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