Low reproductive isolation and highly variable levels of gene flow reveal limited progress towards speciation between European river and brook lampreys.

Détails

ID Serval
serval:BIB_AAC2A00E281A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Low reproductive isolation and highly variable levels of gene flow reveal limited progress towards speciation between European river and brook lampreys.
Périodique
Journal of Evolutionary Biology
Auteur(s)
Rougemont Q., Gaigher A., Lasne E., Côte J., Coke M., Besnard A.L., Launey S., Evanno G.
ISSN
1420-9101 (Electronic)
ISSN-L
1010-061X
Statut éditorial
Publié
Date de publication
2015
Peer-reviewed
Oui
Volume
28
Numéro
12
Pages
2248-2263
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Résumé
Ecologically based divergent selection is a factor that could drive reproductive isolation even in the presence of gene flow. Population pairs arrayed along a continuum of divergence provide a good opportunity to address this issue. Here, we used a combination of mating trials, experimental crosses and population genetic analyses to investigate the evolution of reproductive isolation between two closely related species of lampreys with distinct life histories. We used microsatellite markers to genotype over 1000 individuals of the migratory parasitic river lamprey (Lampetra fluviatilis) and freshwater-resident nonparasitic brook lamprey (Lampetra planeri) distributed in 10 sympatric and parapatric population pairs in France. Mating trials, parentage analyses and artificial fertilizations demonstrated a low level of reproductive isolation between species even though size-assortative mating may contribute to isolation. Most parapatric population pairs were strongly differentiated due to the joint effects of geographic distance and barriers to migration. In contrast, we found variable levels of gene flow between sympatric populations ranging from panmixia to moderate differentiation, which indicates a gradient of divergence with some population pairs that may correspond to alternative morphs or ecotypes of a single species and others that remain partially isolated. Ecologically based divergent selection may explain these variable levels of divergence among sympatric population pairs, but incomplete genome swamping following secondary contact could have also played a role. Overall, this study illustrates how highly differentiated phenotypes can be maintained despite high levels of gene flow that limit the progress towards speciation.
Mots-clé
Animals, Bayes Theorem, Cluster Analysis, Gene Flow, Genetic Markers, Lampreys/classification, Lampreys/genetics, Microsatellite Repeats/genetics, Reproduction, Species Specificity
Pubmed
Web of science
Création de la notice
12/10/2016 10:05
Dernière modification de la notice
20/08/2019 16:14
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