Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands
Reticulated evolution -i.e. secondary introgression / admixture between sister taxa-is increasingly recognized as playing a key role in structuring infra-specific genetic variation and revealing cryptic genetic connectivity patterns. When admixture zones coincide with ecological transitions, the con...
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ftdoajarticles:oai:doaj.org/article:75176b3d05b44ec593277c0c3a5151ab 2023-05-15T17:02:04+02:00 Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands Fraïsse, Christelle Haguenauer, Anne Gérard, Karin Anh-Thu Weber, Alexandra Bierne, Nicolas Chenuil, Anne 2021-11-01T00:00:00Z https://doi.org/10.24072/pcjournal.18 https://doaj.org/article/75176b3d05b44ec593277c0c3a5151ab EN eng Peer Community In https://peercommunityjournal.org/articles/10.24072/pcjournal.18/ https://doaj.org/toc/2804-3871 doi:10.24072/pcjournal.18 2804-3871 https://doaj.org/article/75176b3d05b44ec593277c0c3a5151ab Peer Community Journal, Vol 1, Iss , Pp - (2021) Archaeology CC1-960 Science Q article 2021 ftdoajarticles https://doi.org/10.24072/pcjournal.18 2022-12-31T02:29:06Z Reticulated evolution -i.e. secondary introgression / admixture between sister taxa-is increasingly recognized as playing a key role in structuring infra-specific genetic variation and revealing cryptic genetic connectivity patterns. When admixture zones coincide with ecological transitions, the connectivity patterns often follow environmental variations better than distance and introgression clines may easily be confounded with local adaptation signatures. The Kerguelen mussels is an ideal system to investigate the potential role of admixture in enhancing micro-geographic structure, as they inhabit a small isolated island in the Southern Ocean characterized by a highly heterogeneous environment. Furthermore, genomic reticulation between Northern species ( M. edulis , M. galloprovincialis and M. trossulus ) and Southern species ( M. platensis : South America and the Kerguelen Islands; and M. planulatus : Australasia) has been suspected. Here, we extended a previous analysis by using targeted-sequencing data (51,878 SNPs) across the three Northern species and the Kerguelen population. Spatial structure in the Kerguelen was then analyzed with a panel of 33 SNPs, including SNPs that were more differentiated than the genomic average between Northern species (i.e., ancestry-informative SNPs). We first showed that the Kerguelen lineage splitted very shortly after M. edulis and M. galloprovincialis initiated speciation, and it subsequently experienced admixture with the three Northern taxa. We then demonstrated that the Kerguelen mussels were significantly differentiated over small spatial distance, and that this local genetic structure was associated with environmental variations and mostly revealed by ancestry-informative markers. Simulations of admixture in the island highlight that genetic-environment associations can be better explained by introgression clines between heterogeneously differentiated genomes than by adaptation. Article in Journal/Newspaper Kerguelen Islands Southern Ocean Directory of Open Access Journals: DOAJ Articles Kerguelen Kerguelen Islands Southern Ocean Peer Community Journal 1 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Archaeology CC1-960 Science Q |
spellingShingle |
Archaeology CC1-960 Science Q Fraïsse, Christelle Haguenauer, Anne Gérard, Karin Anh-Thu Weber, Alexandra Bierne, Nicolas Chenuil, Anne Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
topic_facet |
Archaeology CC1-960 Science Q |
description |
Reticulated evolution -i.e. secondary introgression / admixture between sister taxa-is increasingly recognized as playing a key role in structuring infra-specific genetic variation and revealing cryptic genetic connectivity patterns. When admixture zones coincide with ecological transitions, the connectivity patterns often follow environmental variations better than distance and introgression clines may easily be confounded with local adaptation signatures. The Kerguelen mussels is an ideal system to investigate the potential role of admixture in enhancing micro-geographic structure, as they inhabit a small isolated island in the Southern Ocean characterized by a highly heterogeneous environment. Furthermore, genomic reticulation between Northern species ( M. edulis , M. galloprovincialis and M. trossulus ) and Southern species ( M. platensis : South America and the Kerguelen Islands; and M. planulatus : Australasia) has been suspected. Here, we extended a previous analysis by using targeted-sequencing data (51,878 SNPs) across the three Northern species and the Kerguelen population. Spatial structure in the Kerguelen was then analyzed with a panel of 33 SNPs, including SNPs that were more differentiated than the genomic average between Northern species (i.e., ancestry-informative SNPs). We first showed that the Kerguelen lineage splitted very shortly after M. edulis and M. galloprovincialis initiated speciation, and it subsequently experienced admixture with the three Northern taxa. We then demonstrated that the Kerguelen mussels were significantly differentiated over small spatial distance, and that this local genetic structure was associated with environmental variations and mostly revealed by ancestry-informative markers. Simulations of admixture in the island highlight that genetic-environment associations can be better explained by introgression clines between heterogeneously differentiated genomes than by adaptation. |
format |
Article in Journal/Newspaper |
author |
Fraïsse, Christelle Haguenauer, Anne Gérard, Karin Anh-Thu Weber, Alexandra Bierne, Nicolas Chenuil, Anne |
author_facet |
Fraïsse, Christelle Haguenauer, Anne Gérard, Karin Anh-Thu Weber, Alexandra Bierne, Nicolas Chenuil, Anne |
author_sort |
Fraïsse, Christelle |
title |
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
title_short |
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
title_full |
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
title_fullStr |
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
title_full_unstemmed |
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands |
title_sort |
fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated kerguelen islands |
publisher |
Peer Community In |
publishDate |
2021 |
url |
https://doi.org/10.24072/pcjournal.18 https://doaj.org/article/75176b3d05b44ec593277c0c3a5151ab |
geographic |
Kerguelen Kerguelen Islands Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Islands Southern Ocean |
genre |
Kerguelen Islands Southern Ocean |
genre_facet |
Kerguelen Islands Southern Ocean |
op_source |
Peer Community Journal, Vol 1, Iss , Pp - (2021) |
op_relation |
https://peercommunityjournal.org/articles/10.24072/pcjournal.18/ https://doaj.org/toc/2804-3871 doi:10.24072/pcjournal.18 2804-3871 https://doaj.org/article/75176b3d05b44ec593277c0c3a5151ab |
op_doi |
https://doi.org/10.24072/pcjournal.18 |
container_title |
Peer Community Journal |
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1 |
_version_ |
1766055294531534848 |