Analyse du gene cytochrome b de l'ADN mitochondrial chez le pouple Octopus vulgaris (Cephalopoda, Octopoda) des cotes Nord et Sud tunisiennes.

Abstract

Among the common cephalopods, Octopus vulgaris is the main species exploited by the inshore fishing especially in the Tunisian Southern waters. Genetic analysis based on molecular and population approach is considered necessary to ensure a credible and sustainable management of the stock. The analysis focused on mitochondrial DNA polymorphism by sequencing 485pb fragment of the Cytochrome b gene in 52 samples collected from two different localities in Tunisia: Galite island (North) and Elketf-Zarzis (South ). The results showed that there were 14 different haplotypes of which two shared by the two groups. The most represented haplotype is (H2) encountered in 29 individuals. A genetic differentiation between the two groups was detected (FST = 0.055; P <0.05) suggesting that the Strait of Sicily limits genetic flow between the two Mediterranean areas and therefore, it would act as a biogeographic barrier.