Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt
Abstract Human transport of species across oceans disrupts natural dispersal barriers and facilitates hybridization between previously allopatric species. The recent introduction of the North Pacific sea squirt, Ciona robusta, into the native range of the North Atlantic sea squirt, Ciona intestinali...
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2024
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Online Access: | http://dx.doi.org/10.1093/evlett/qrae016 https://academic.oup.com/evlett/article-pdf/8/4/600/58646845/qrae016.pdf |
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croxfordunivpr:10.1093/evlett/qrae016 2024-09-15T18:23:53+00:00 Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt Touchard, Fanny Cerqueira, Frédérique Bierne, Nicolas Viard, Frédérique French National Research Agency Institut des Sciences de l’Evolution de Montpellier 2024 http://dx.doi.org/10.1093/evlett/qrae016 https://academic.oup.com/evlett/article-pdf/8/4/600/58646845/qrae016.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Evolution Letters volume 8, issue 4, page 600-609 ISSN 2056-3744 journal-article 2024 croxfordunivpr https://doi.org/10.1093/evlett/qrae016 2024-08-05T04:31:51Z Abstract Human transport of species across oceans disrupts natural dispersal barriers and facilitates hybridization between previously allopatric species. The recent introduction of the North Pacific sea squirt, Ciona robusta, into the native range of the North Atlantic sea squirt, Ciona intestinalis, is a good example of this outcome. Recent studies have revealed an adaptive introgression in a single chromosomal region from the introduced into the native species. Here, we monitored this adaptive introgression over time, examining both the frequency of adaptive alleles at the core and the hitchhiking footprint in the shoulders of the introgression island by studying a thousand Ciona spp. individuals collected in 22 ports of the contact zone, 14 of which were sampled 20 generations apart. For that purpose, we developed a KASP multiplex genotyping approach, which proved effective in identifying native, nonindigenous and hybrid individuals and in detecting introgressed haplotypes. We found no early generation hybrids in the entire sample, and field observations suggest a decline in the introduced species. At the core region of the introgression sweep, where the frequency of C. robusta alleles is the highest and local adaptation genes must be, we observed stable frequencies of adaptive alien alleles in both space and time. In contrast, we observed erosion of C. robusta ancestry tracts in flanking chromosomal shoulders on the edges of the core, consistent with the second phase of a local sweep and a purge of hitchhiked incompatible mutations. We hypothesize that adaptive introgression may have modified the competition relationships between the native and invasive species in human-altered environments. Article in Journal/Newspaper North Atlantic Oxford University Press Evolution Letters |
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Oxford University Press |
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English |
description |
Abstract Human transport of species across oceans disrupts natural dispersal barriers and facilitates hybridization between previously allopatric species. The recent introduction of the North Pacific sea squirt, Ciona robusta, into the native range of the North Atlantic sea squirt, Ciona intestinalis, is a good example of this outcome. Recent studies have revealed an adaptive introgression in a single chromosomal region from the introduced into the native species. Here, we monitored this adaptive introgression over time, examining both the frequency of adaptive alleles at the core and the hitchhiking footprint in the shoulders of the introgression island by studying a thousand Ciona spp. individuals collected in 22 ports of the contact zone, 14 of which were sampled 20 generations apart. For that purpose, we developed a KASP multiplex genotyping approach, which proved effective in identifying native, nonindigenous and hybrid individuals and in detecting introgressed haplotypes. We found no early generation hybrids in the entire sample, and field observations suggest a decline in the introduced species. At the core region of the introgression sweep, where the frequency of C. robusta alleles is the highest and local adaptation genes must be, we observed stable frequencies of adaptive alien alleles in both space and time. In contrast, we observed erosion of C. robusta ancestry tracts in flanking chromosomal shoulders on the edges of the core, consistent with the second phase of a local sweep and a purge of hitchhiked incompatible mutations. We hypothesize that adaptive introgression may have modified the competition relationships between the native and invasive species in human-altered environments. |
author2 |
French National Research Agency Institut des Sciences de l’Evolution de Montpellier |
format |
Article in Journal/Newspaper |
author |
Touchard, Fanny Cerqueira, Frédérique Bierne, Nicolas Viard, Frédérique |
spellingShingle |
Touchard, Fanny Cerqueira, Frédérique Bierne, Nicolas Viard, Frédérique Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
author_facet |
Touchard, Fanny Cerqueira, Frédérique Bierne, Nicolas Viard, Frédérique |
author_sort |
Touchard, Fanny |
title |
Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
title_short |
Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
title_full |
Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
title_fullStr |
Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
title_full_unstemmed |
Adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
title_sort |
adaptive alien genes are maintained amid a vanishing introgression footprint in a sea squirt |
publisher |
Oxford University Press (OUP) |
publishDate |
2024 |
url |
http://dx.doi.org/10.1093/evlett/qrae016 https://academic.oup.com/evlett/article-pdf/8/4/600/58646845/qrae016.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Evolution Letters volume 8, issue 4, page 600-609 ISSN 2056-3744 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/evlett/qrae016 |
container_title |
Evolution Letters |
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1810464171124326400 |