Titre :

An introgression breakthrough left by an anthropogenic contact between two ascidians

Auteur(s) :

Moan, Alan [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Roby, Charlotte [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Fraisse, Christelle [Auteur]
Évolution, Écologie et Paléontologie (Evo-Eco-Paleo) - UMR 8198 [Evo-Eco-Paléo (EEP)]
Daguin-Thiébaut, Claire [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Bierne, Nicolas [Auteur]
Institut des Sciences de l'Evolution de Montpellier [UMR ISEM]
Viard, Frédérique [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Institut des Sciences de l'Evolution de Montpellier [UMR ISEM]

Titre de la revue :

Molecular ecology

Éditeur :

Wiley

Date de publication :

2021

ISSN :

0962-1083

Mot(s)-clé(s) en anglais :

Biological introductions
non-indigenous species
anthropogenic hybridization
introgression hotspots
population genomics
tunicates

Discipline(s) HAL :

Sciences du Vivant [q-bio]/Génétique/Génétique des populations [q-bio.PE]
Sciences du Vivant [q-bio]/Biodiversité/Evolution [q-bio.PE]
Sciences de l'environnement/Biodiversité et Ecologie
Sciences de l'environnement/Milieux et Changements globaux

Résumé en anglais : [en]

Human-driven translocations of species have diverse evolutionary consequences such as promoting hybridization between previously geographically isolated taxa. This is wellillustrated by the solitary tunicate, Ciona robusta, ...
Lire la suite >Human-driven translocations of species have diverse evolutionary consequences such as promoting hybridization between previously geographically isolated taxa. This is wellillustrated by the solitary tunicate, Ciona robusta, native to the North East Pacific and introduced in the North East Atlantic. It is now co-occurring with its congener C. intestinalis in the English Channel, and C. roulei in the Mediterranean Sea. Despite their long allopatric divergence, first and second generation crosses showed a high hybridization success between the introduced and native taxa in the laboratory. However, previous genetic studies failed to provide evidence of recent hybridization between C. robusta and C. intestinalis in the wild. Using SNPs obtained from ddRAD-sequencing of 397 individuals from 26 populations, we further explored the genome-wide population structure of the native Ciona taxa. We first confirmed results documented in previous studies, notably i) a chaotic genetic structure at regional scale, and ii) a high genetic similarity between C. roulei and C. intestinalis, which is calling for further taxonomic investigation. More importantly, and unexpectedly, we also observed a genomic hotspot of long introgressed C. robusta tracts into C. intestinalis genomes at several locations of their contact zone. Both the genomic architecture of introgression, restricted to a 1.5 Mb region of chromosome 5, and its absence in allopatric populations suggest introgression is recent and occurred after the introduction of the non-indigenous species. Overall, our study shows that anthropogenic hybridization can be effective in promoting introgression breakthroughs between species at a late stage of the speciation continuum.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Évolution, Écologie et Paléontologie (Evo Eco Paleo) - UMR 8198

Source :

Harvested from HAL