Section: Evolutionary Biology
Topic:
Evolution,
Genetics/Genomics,
Population biology
Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands
Corresponding author(s): Fraïsse, Christelle (christelle.fraisse@univ-lille.fr)
10.24072/pcjournal.18 - Peer Community Journal, Volume 1 (2021), article no. e10.
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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.
Type: Research article
Fraïsse, Christelle 1, 2; Haguenauer, Anne 3; Gérard, Karin 4; Anh-Thu Weber, Alexandra 3; Bierne, Nicolas 2; Chenuil, Anne 3
CC-BY 4.0
@article{10_24072_pcjournal_18,
author = {Fra{\"\i}sse, Christelle and Haguenauer, Anne and G\'erard, Karin and Anh-Thu Weber, Alexandra and Bierne, Nicolas and Chenuil, Anne},
title = {Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated {Kerguelen} {Islands}},
journal = {Peer Community Journal},
eid = {e10},
publisher = {Peer Community In},
volume = {1},
year = {2021},
doi = {10.24072/pcjournal.18},
url = {https://peercommunityjournal.org/articles/10.24072/pcjournal.18/}
}
TY - JOUR AU - Fraïsse, Christelle AU - Haguenauer, Anne AU - Gérard, Karin AU - Anh-Thu Weber, Alexandra AU - Bierne, Nicolas AU - Chenuil, Anne TI - Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands JO - Peer Community Journal PY - 2021 VL - 1 PB - Peer Community In UR - https://peercommunityjournal.org/articles/10.24072/pcjournal.18/ DO - 10.24072/pcjournal.18 ID - 10_24072_pcjournal_18 ER -
%0 Journal Article %A Fraïsse, Christelle %A Haguenauer, Anne %A Gérard, Karin %A Anh-Thu Weber, Alexandra %A Bierne, Nicolas %A Chenuil, Anne %T Fine-grained habitat-associated genetic connectivity in an admixed population of mussels in the small isolated Kerguelen Islands %J Peer Community Journal %D 2021 %V 1 %I Peer Community In %U https://peercommunityjournal.org/articles/10.24072/pcjournal.18/ %R 10.24072/pcjournal.18 %F 10_24072_pcjournal_18
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. Peer Community Journal, Volume 1 (2021), article no. e10. doi : 10.24072/pcjournal.18. https://peercommunityjournal.org/articles/10.24072/pcjournal.18/
PCI peer reviews and recommendation, and links to data, scripts, code and supplementary information: 10.24072/pci.evolbiol.100059
Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.
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