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Phylogeography of Ophryotrocha labronica (Polychaeta, Dorvilleidae) along the Italian coasts

Cossu, Piero and Maltagliati, Ferruccio and Pannacciulli, Federica G. and Simonini, Roberto and Massamba-N'Siala, Gloria and Casu, Marco and Lardicci, Claudio and Prevedelli, Daniela and Castelli, Alberto (2014) Phylogeography of Ophryotrocha labronica (Polychaeta, Dorvilleidae) along the Italian coasts. Marine Ecology , in press. ISSN 0173-9565. eISSN 1439-0485. Article.

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DOI: 10.1111/maec.12203

Abstract

Species of the genus Ophryotrocha are a well-studied group of organisms but, despite the relatively large body of biological studies, little is known about their intra-specific patterns of genetic diversity. In the present study, we analysed the patterns of genetic variation in samples of Ophryotrocha labronica (Polychaeta, Dorvilleidae) collected along the Italian coasts within three regions with different thermal regimes: the Northern Adriatic Sea (NAS), the Ligurian Sea (LS), and the South/Southeast Sicilian Sea (SS). A partial sequence of the cytochrome c oxidase subunit I (COI) gene was used as a genetic marker. An analysis of molecular variance (AMOVA) showed significant genetic differentiation between the NAS and the other regions. Conversely, little or no genetic structuring was found between the LS and the SS or amongst locations within a given region. A Bayesian phylogenetic tree and a median-joining network provided evidence for the occurrence of two highly divergent genetic lineages characterized by a high average sequence divergence (17.2%, Kimura two-parameter distance). The spatial patterns of genetic variation found in O. labronica may reflect the signature of past expansion events of the two genetic lineages. Although the high sequence divergence suggested that cryptic speciation within O. labronica may have occurred, other traits such as the absence of reproductive isolation, pattern of phenotypic variation and habitat specificity prompted us to regard the two groups as distinct COI lineages of O. labronica.

Item Type:Article
ID Code:10320
Status:In Press
Refereed:Yes
Uncontrolled Keywords:Cytochrome c oxidase subunit I, genetic diversity, Mediterranean Sea, mtDNA lineages, Ophryotrocha labronica
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Blackwell / Wiley
ISSN:0173-9565
eISSN:1439-0485
Deposited On:17 Nov 2014 11:02

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