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Mitochondrial DNA variability of the pipefish Syngnathus abaster

Sanna, Daria and Biagi, Francesca and Ben Alaya, Hajer and Maltagliati, Ferruccio and Addis, Alberto and Romero, Alejandro and De Juan, Joaquín and Quignard, Jean Pierre and Castelli, Alberto and Franzoi, Piero and Torricelli, Patrizia and Casu, Marco and Carcupino, Marcella and Francalacci, Paolo (2013) Mitochondrial DNA variability of the pipefish Syngnathus abaster. Journal of Fish Biology, Vol. 82 (3), p. 856-876. eISSN 1095-8649. Article.

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DOI: 10.1111/jfb.12027

Abstract

This study provides data on the genetic structuring of the pipefish Syngnathus abaster in the western Mediterranean and Adriatic Seas. A total of 109 specimens were collected in brackish-water biotopes. The control region and three other regions of the mitochondrial genome were analysed. The most relevant result was the high genetic structuring found by Bayesian inference (BI), maximum likelihood (ML) and network analyses, which were consistent in showing three well-separated clusters of S. abaster populations. Furthermore, BI and ML did not support the monophyly of the taxon S. abaster. These results suggest the occurrence of a species complex in the study area, whose differentiation may have occurred since the Pleistocene. The results also show a very high genetic variability at the inter-population level, with no shared haplotypes among sites. Evolutionary forces due to the fragmented nature of the brackish-water habitats may account for the high genetic divergence found among the groups and populations. Finally, although dispersal by rafting over long distances may occasionally occur, this study suggests linear stepping-stone model of colonization to be most likely. The complexity of the results obtained suggests that further studies are needed to elucidate the phylogeny of S. abaster.

Item Type:Article
ID Code:9528
Status:Published
Refereed:Yes
Uncontrolled Keywords:Brackish-water habitat, mitochondrial DNA, population genetics, speciation, Syngnathidae
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Area 05 - Scienze biologiche > BIO/18 Genetica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Blackwell / Wiley
eISSN:1095-8649
Copyright Holders:© 2013 The Authors, Journal of Fish Biology © 2013 The Fisheries Society of the British Isles
Deposited On:04 Dec 2013 13:41

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