Replicated anthropogenic hybridisations reveal parallel patterns of admixture in marine mussels

Type Article
Date 2020-03
Language English
Author(s) Simon Alexis1, Arbiol Christine1, Nielsen Einar Eg2, Couteau Jérôme3, Sussarellu RossanaORCID4, Burgeot Thierry4, Bernard Ismaël5, Coolen Joop W. P.6, 7, Lamy Jean-BaptisteORCID8, Robert Stephane8, Skazina Maria9, 10, Strelkov Petr9, 10, Queiroga Henrique11, Cancio Ibon12, Welch John J.13, Viard Frédérique14, Bierne Nicolas1
Affiliation(s) 1 : ISEM Univ Montpellier CNRS EPHE IRD Montpellier, France
2 : Section for Marine Living Resources National Institute of Aquatic Resources Technical University of Denmark Silkeborg, Denmark
3 : SARL TOXEM Le Havre, France
4 : Ifremer Unité Biogéochimie et Écotoxicologie Centre Atlantique Nantes, France
5 : SAS Eurêka Mer Lézardrieux, France
6 : Wageningen Marine Research Den Helder, The Netherlands
7 : Aquatic Ecology and Water Quality Management Group Wageningen University Wageningen ,the Netherlands
8 : SG2M‐LGPMM Laboratoire de Génétique et Pathologie des Mollusques Marins Ifremer La Tremblade ,France
9 : St. Petersburg State University St. Petersburg, Russia
10 : Laboratory of Monitoring and Conservation of Natural Arctic Ecosystems Murmansk Arctic State University Murmansk, Russia
11 : Department of Biology & CESAM University of Aveiro Aveiro, Portugal
12 : CBET Research Group Department of Zoology and Animal Cell Biology Faculty Science and Technology and Research Centre for Experimental Marine Biology and Biotechnology (PiE‐UPV/EHU) University of the Basque Country (UPV/EHU) Bilbao ,Spain
13 : Department of Genetics University of Cambridge Cambridge, UK
14 : Department AD2M UPMC Univ Paris 06 CNRS UMR 7144 Station Biologique Sorbonne Universités, Roscoff ,France
Source Evolutionary Applications (1752-4571) (Wiley), 2020-03 , Vol. 13 , N. 3 , P. 575-599
DOI 10.1111/eva.12879
WOS© Times Cited 14
Note Special Issue: An evolutionary perspective on marine bioinvasions: evolutionary history, adaptation, and species interactions
Keyword(s) admixture, bentho-pelagic species, biological introductions, clines, ports, secondary contact

Human‐mediated transport creates secondary contacts between genetically differentiated lineages, bringing new opportunities for gene exchange. When similar introductions occur in different places, they provide informally replicated experiments for studying hybridisation. We here examined 4,279 Mytilus mussels, sampled in Europe and genotyped with 77 ancestry‐informative markers. We identified a type of introduced mussels, called “dock mussels,” associated with port habitats and displaying a particular genetic signal of admixture between M. edulis and the Mediterranean lineage of M. galloprovincialis. These mussels exhibit similarities in their ancestry compositions, regardless of the local native genetic backgrounds and the distance separating colonised ports. We observed fine‐scale genetic shifts at the port entrance, at scales below natural dispersal distance. Such sharp clines do not fit with migration‐selection tension zone models, and instead suggest habitat choice and early‐stage adaptation to the port environment, possibly coupled with connectivity barriers. Variations in the spread and admixture patterns of dock mussels seem to be influenced by the local native genetic backgrounds encountered. We next examined departures from the average admixture rate at different loci, and compared human‐mediated admixture events, to naturally admixed populations and experimental crosses. When the same M. galloprovincialis background was involved, positive correlations in the departures of loci across locations were found; but when different backgrounds were involved, no or negative correlations were observed. While some observed positive correlations might be best explained by a shared history and saltatory colonisation, others are likely produced by parallel selective events. Altogether, genome‐wide effect of admixture seems repeatable and more dependent on genetic background than environmental context. Our results pave the way towards further genomic analyses of admixture, and monitoring of the spread of dock mussels both at large and at fine spacial scales.

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Simon Alexis, Arbiol Christine, Nielsen Einar Eg, Couteau Jérôme, Sussarellu Rossana, Burgeot Thierry, Bernard Ismaël, Coolen Joop W. P., Lamy Jean-Baptiste, Robert Stephane, Skazina Maria, Strelkov Petr, Queiroga Henrique, Cancio Ibon, Welch John J., Viard Frédérique, Bierne Nicolas (2020). Replicated anthropogenic hybridisations reveal parallel patterns of admixture in marine mussels. Evolutionary Applications, 13(3), 575-599. Publisher's official version : , Open Access version :