Aquat. Living Resour.
Volume 29, Number 4, October-December 2016
|Number of page(s)||6|
|Published online||22 December 2016|
New insights about the introduction of the Portuguese oyster, Crassostrea angulata, into the North East Atlantic from Asia based on a highly polymorphic mitochondrial region
1 Instituto Português do Mar e da Atmosfera, Estação Experimental de Moluscicultura de Tavira, Av. 5 de Outubro, 8700-305 Olhão, Portugal
2 Instituto Português do Mar e da Atmosfera, Av. de Brasília, 1449-006 Lisboa, Portugal
3 Université Abdelmalek Essaâdi, Faculté Polydisciplinaire de Larache, Département de Biologie, B.P. 745, 92004 Larache, Morocco
4 Centre for Applied Marine Sciences, School of Ocean Sciences, College of Natural Sciences, Bangor University, Menai Bridge, Anglesey LL59 5AB, UK
5 Current address: GABI, INRA, AgroParisTech, Université Paris-Saclay, 78350 Jouy-en-Josas, France
6 Centro de Ciências do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
7 Environmental Science Center (ESC), Qatar University, P.O. Box: 2713 Doha, Qatar
8 Instituto Dom Luiz, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, Edifício C1, Piso, 1749-016 Lisboa, Portugal
9 Ifremer, Unité de recherche Physiologie Fonctionnelle des Organismes Marins, Laboratoire des Sciences de l’Environnement Marin (UMR 6539 LEMAR CNRS/UBO/IRD/Ifremer), ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France
a Corresponding author: email@example.com
Received: 12 July 2016
Accepted: 2 December 2016
It is commonly presumed that the Portuguese oyster Crassostrea angulata was introduced into the North East (NE) Atlantic from Asia. The analysis of the nucleotide sequence of a highly polymorphic non-coding mitochondrial region (major noncoding region – MNR) of C. angulata samples collected in Europe (Portugal), Africa (Morocco) and Asia (Shantou and Taiwan) provided new insight into the introduction of this species into the NE Atlantic. Sixty haplotypes and a nucleotide diversity of 0.0077 were observed in 130 analyzed sequences. Higher nucleotide diversity levels were observed in NE Atlantic sites than in Asian sites and significant genetic differentiation was found between the two. Our results suggest that C. angulata might have been introduced to the NE Atlantic by multiple introductory events, though the exact origins remain unknown since none of the analyzed Asian sites seemed to have been a source of introduction. The nucleotide diversity of C. angulata was higher than that previously reported for Pacific oyster C. gigas in Europe and Asia for the same mitochondrial region. The results obtained in the present study suggest that NE Atlantic C. angulata stocks are a unique genetic resource, which highlights the importance of their conservation.
Key words: Crassostrea angulata / phylogeography / genetic signature / biological invasions
© EDP Sciences 2016
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