Inter-Specific Genetic Exchange Despite Strong Divergence in Deep-Sea Hydrothermal Vent Gastropods of the Genus Alviniconcha

Type Article
Date 2022-06
Language English
Author(s) Castel Jade1, Hourdez Stéphane2, Pradillon FlorenceORCID3, Daguin-Thiébaut ClaireORCID1, Ballenghien Marion1, Ruault Stéphanie1, Corre Erwan4, Tran Lu y Adrien5, Mary Jean1, Gagnaire Pierre-AlexandreORCID5, Bonhomme FrançoisORCID5, Breusing CorinnaORCID6, Broquet ThomasORCID1, Jollivet DidierORCID1
Affiliation(s) 1 : Dynamique de la Diversité Marine’ (DyDiv) Lab, Station Biologique de Roscoff, Sorbonne Université, CNRS, UMR 7144, Place G. Teissier, 29680 Roscoff, France
2 : Laboratoire d’Ecogéochimie des Environnements Benthiques, Observatoire Océanologique de Banyuls, Sorbonne Université, CNRS, UMR 8222, Avenue Pierre Fabre, 66650 Banyuls-sur-Mer, France
3 : Unité Biologie et Ecologie des Ecosystèmes Marins Profonds, Université de Brest, Ifremer, CNRS, 29280 Plouzané, France
4 : ABiMS Bioinformatics Facility, Station biologique de Roscoff, Sorbonne Université, CNRS, FR2424, Place G. Teissier, 29680 Roscoff, France
5 : Team MBE, Department Genφ, ISEM, Université de Montpellier, CNRS, EPHE, IRD, 34110 Montpellier, France
6 : Graduate School of Oceanography, University of Rhode Island, 215 South Ferry Rd, Narragansett, RI 02882, USA
Source Genes (2073-4425) (MDPI AG), 2022-06 , Vol. 13 , N. 6 , P. 985 (26p.)
DOI 10.3390/genes13060985
Note This article belongs to the Special Issue Feature Papers in Population and Evolutionary Genetics and Genomics
Keyword(s) speciation, secondary contact, nuclear and mitochondrial genome, transcriptome, DILS
Abstract

Deep hydrothermal vents are highly fragmented and unstable habitats at all temporal and spatial scales. Such environmental dynamics likely play a non-negligible role in speciation. Little is, however, known about the evolutionary processes that drive population-level differentiation and vent species isolation and, more specifically, how geography and habitat specialisation interplay in the species history of divergence. In this study, the species range and divergence of Alviniconcha snails that occupy active Western Pacific vent fields was assessed by using sequence variation data of the mitochondrial Cox1 gene, RNAseq, and ddRAD-seq. Combining morphological description and sequence datasets of the three species across five basins, we confirmed that A. kojimai, A. boucheti, and A. strummeri, while partially overlapping over their range, display high levels of divergence in the three genomic compartments analysed that usually encompass values retrieved for reproductively isolated species with divergences rang from 9% to 12.5% (mtDNA) and from 2% to 3.1% (nuDNA). Moreover, the three species can be distinguished on the basis of their external morphology by observing the distribution of bristles and the shape of the columella. According to this sampling, A. boucheti and A. kojimai form an east-to-west species abundance gradient, whereas A. strummeri is restricted to the Futuna Arc/Lau and North Fiji Basins. Surprisingly, population models with both gene flow and population size heterogeneities among genomes indicated that these three species are still able to exchange genes due to secondary contacts at some localities after a long period of isolation.

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Castel Jade, Hourdez Stéphane, Pradillon Florence, Daguin-Thiébaut Claire, Ballenghien Marion, Ruault Stéphanie, Corre Erwan, Tran Lu y Adrien, Mary Jean, Gagnaire Pierre-Alexandre, Bonhomme François, Breusing Corinna, Broquet Thomas, Jollivet Didier (2022). Inter-Specific Genetic Exchange Despite Strong Divergence in Deep-Sea Hydrothermal Vent Gastropods of the Genus Alviniconcha. Genes, 13(6), 985 (26p.). Publisher's official version : https://doi.org/10.3390/genes13060985 , Open Access version : https://archimer.ifremer.fr/doc/00773/88519/