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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on June 8, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp160
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Microsatellite analysis of red mullet Mullus barbatus (Perciformes, Mullidae) reveals the isolation of the Adriatic Basin in the Mediterranean Sea

Teresa Maggio1, Sabrina Lo Brutto1, Flavio Garoia1,2, Fausto Tinti1,2 and Marco Arculeo1

1 Dipartimento di Biologia Animale "G. Reverberi", Università di Palermo, Via Archirafi 18, 90123 Palermo, Italy
2 Molecular Genetics for Environmental and Fishery Resources Laboratory (GenMAP), Interdepartmental Centre for Research in Environmental Sciences, University of Bologna, Ravenna, Italy

Correspondence to M. Arculeo: tel. +39 091 6230134; fax: +39 091 6230144; e-mail: marculeo{at}unipa.it.

Maggio, T., Lo Brutto, S., Garoia, F., Tinti, F., and Arculeo, M. 2009. Microsatellite analysis of red mullet Mullus barbatus (Perciformes, Mullidae) reveals the isolation of the Adriatic Basin in the Mediterranean Sea. – ICES Journal of Marine Science, 66: 000–000.

The red mullet Mullus barbatus is commercially one of the most important demersal fish resources in the Mediterranean. Molecular data on its genetic population structure throughout the Mediterranean are reported. Six microsatellite loci displayed a high degree of expected heterozygosity and a high allele number per locus. The Hardy–Weinberg equilibrium test revealed an overall tendency towards heterozygote deficiency, probably caused by the admixture of various demes. Population differentiation was assessed by analysis of molecular variance (AMOVA) and Bayesian analysis. AMOVA showed that most of the variation was within the population, but the mean value of FST was significant, indicating genetic differentiation among the samples analysed. This differentiation is primarily attributable to the isolation of the Adriatic samples and partly to a weaker substructuring of the populations in the Gulf of Lions, Tyrrhenian Sea, Strait of Sicily, and Ionian Sea. Bayesian analysis also revealed genetic differentiation among the samples analysed, identifying two genetic clusters. The restricted gene flow from and to the Adriatic, also recorded for other fish species, most likely reflects the environmental separation of the Adriatic and suggests that management protocols for the red mullet in the Mediterranean should be revisited.

Keywords: microsatellite, Mullus barbatus, population structuring

Received 30 April 2009; accepted 1 May 2009.


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