An introgression breakthrough left by an anthropogenic contact between two ascidians
Abstract 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...
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Online Access: | http://dx.doi.org/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16189 |
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crwiley:10.1111/mec.16189 2024-06-23T07:55:23+00:00 An introgression breakthrough left by an anthropogenic contact between two ascidians Le Moan, Alan Roby, Charlotte Fraïsse, Christelle Daguin‐Thiébaut, Claire Bierne, Nicolas Viard, Frédérique 2021 http://dx.doi.org/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16189 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 30, issue 24, page 6718-6732 ISSN 0962-1083 1365-294X journal-article 2021 crwiley https://doi.org/10.1111/mec.16189 2024-06-11T04:43:03Z Abstract 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. Article in Journal/Newspaper North East Atlantic Wiley Online Library Pacific Molecular Ecology 30 24 6718 6732 |
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English |
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Abstract 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. |
format |
Article in Journal/Newspaper |
author |
Le Moan, Alan Roby, Charlotte Fraïsse, Christelle Daguin‐Thiébaut, Claire Bierne, Nicolas Viard, Frédérique |
spellingShingle |
Le Moan, Alan Roby, Charlotte Fraïsse, Christelle Daguin‐Thiébaut, Claire Bierne, Nicolas Viard, Frédérique An introgression breakthrough left by an anthropogenic contact between two ascidians |
author_facet |
Le Moan, Alan Roby, Charlotte Fraïsse, Christelle Daguin‐Thiébaut, Claire Bierne, Nicolas Viard, Frédérique |
author_sort |
Le Moan, Alan |
title |
An introgression breakthrough left by an anthropogenic contact between two ascidians |
title_short |
An introgression breakthrough left by an anthropogenic contact between two ascidians |
title_full |
An introgression breakthrough left by an anthropogenic contact between two ascidians |
title_fullStr |
An introgression breakthrough left by an anthropogenic contact between two ascidians |
title_full_unstemmed |
An introgression breakthrough left by an anthropogenic contact between two ascidians |
title_sort |
introgression breakthrough left by an anthropogenic contact between two ascidians |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mec.16189 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mec.16189 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_source |
Molecular Ecology volume 30, issue 24, page 6718-6732 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mec.16189 |
container_title |
Molecular Ecology |
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30 |
container_issue |
24 |
container_start_page |
6718 |
op_container_end_page |
6732 |
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1802647967756189696 |