Titre
Low reproductive isolation and highly variable levels of gene flow reveal limited progress towards speciation between European river and brook lampreys.
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Rougemont, Q.
Auteure/Auteur
Gaigher, A.
Auteure/Auteur
Lasne, E.
Auteure/Auteur
Côte, J.
Auteure/Auteur
Coke, M.
Auteure/Auteur
Besnard, A.L.
Auteure/Auteur
Launey, S.
Auteure/Auteur
Evanno, G.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
1420-9101
Statut éditorial
Publié
Date de publication
2015-12
Volume
28
Numéro
12
Première page
2248
Dernière page/numéro d’article
2263
Peer-reviewed
Oui
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Publication 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.
PID Serval
serval:BIB_AAC2A00E281A
PMID
Open Access
Oui
Date de création
2016-10-12T08:05:02.858Z
Date de création dans IRIS
2025-05-20T23:43:23Z