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- Le Moan, AlanGothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper, Tjärnö marinlaboratoriet,Department of marine sciences, Tjärnö Marine Laboratory (author)
An introgression breakthrough left by an anthropogenic contact between two ascidians
- Article/chapterEnglish2021
Publisher, publication year, extent ...
- 2021-10-05
- Wiley,2021
Numbers
- LIBRIS-ID:oai:gup.ub.gu.se/310313
- https://gup.ub.gu.se/publication/310313URI
- https://doi.org/10.1111/mec.16189DOI
Supplementary language notes
- Language:English
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Notes
- Human-driven translocations of species have diverse evolutionary consequences such as promoting hybridization between previously geographically isolated taxa. This is well illustrated 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 Ciona 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-native 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.
Subject headings and genre
- NATURVETENSKAP Biologi Ekologi hsv//swe
- NATURAL SCIENCES Biological Sciences Ecology hsv//eng
- anthropogenic hybridization
- biological introductions
- introgression
- hotspots
- nonindigenous species
- population genomics
- tunicates
- ciona-intestinalis
- alien tunicate
- r package
- hybridization
- genome
- connectivity
- information
- populations
- landscape
- invasions
- Biochemistry & Molecular Biology
- Environmental Sciences & Ecology
- Evolutionary Biology
Added entries (persons, corporate bodies, meetings, titles ...)
- Roby, C. (author)
- Fraisse, C. (author)
- Daguin-Thiebaut, C. (author)
- Bierne, N. (author)
- Viard, F. (author)
- Göteborgs universitetInstitutionen för marina vetenskaper, Tjärnö marinlaboratoriet (creator_code:org_t)
Related titles
- In:Molecular Ecology: Wiley30:24, s. 6718-67320962-10831365-294X
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