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Origin and route of establishment of the invasive Pacific oyster Crassostrea gigas in Scandinavia
Univ Gothenburg, Dept Marine Sci Tjarno, S-45296 Stromstad, Sweden..
Univ Gothenburg, Dept Marine Sci Tjarno, S-45296 Stromstad, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
Senckenberg Biodiversitat & Klima Forschungszentr, Senckenberg Gesell Nat Forsch, D-60325 Frankfurt, Germany..
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2017 (English)In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 575, 95-105 p.Article in journal (Refereed) Published
Abstract [en]

Identifying the routes and rates of introductions is fundamental for the understanding of marine invasions. Recurring introductions over the last 50 yr have led to the establishment of feral Pacific oyster Crassostrea gigas populations throughout Europe. In the northern countries, Sweden and Norway, the species first occurred in large numbers in 2006. Here, we investigated the relative importance of introduction via re-laying of cultured oysters imported for consumption from France, Ireland or the Netherlands, and dispersal of oyster larvae by ocean currents from wild oyster populations in Denmark. Using microsatellite DNA markers, we estimated genetic differentiation among Pacific oysters collected at 4 Swedish locations, 3 Norwegian locations and 9 potential source locations in Denmark, Ireland, the Netherlands and France. All Swedish samples and 1 Norwegian sample(Tromlingene) were genetically similar to each other and the Danish samples and showed significant genetic differentiation from all other populations. Consequently, it appears that the Pacific oyster populations in Sweden, Denmark and Tromlingene are closely connected and/or share a recent origin. The 2 remaining Norwegian samples(Hui and Espevik) differed from each other and all other populations, but showed similarities to wild oyster samples from Scandinavia and Ireland, respectively. Overall, the results underline a complex origin of Norwegian oysters, with gene flow from Swedish/Danish populations, as well as other unidentified sources. The apparent connectivity among most of the Scandinavian populations has implications for regional management of this invasive species, and highlights possible scenarios for other marine invasive species with a similar life history.

Place, publisher, year, edition, pages
INTER-RESEARCH , 2017. Vol. 575, 95-105 p.
Keyword [en]
Population genetics, Microsatellites, Range expansion, Non-native species, Aquaculture, Connectivity, Scandinavia, Skagerrak
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-332851DOI: 10.3354/meps12219ISI: 000406135500008OAI: oai:DiVA.org:uu-332851DiVA: diva2:1155584
Funder
Swedish Research Council FormasStiftelsen Olle Engkvist ByggmästareHelge Ax:son Johnsons stiftelse
Available from: 2017-11-08 Created: 2017-11-08 Last updated: 2017-11-08Bibliographically approved

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