Spatial genetic patterns of Octopus vulgaris Mediterranean populations support the hypothesis of a transitional zone across the Siculo-Tunisian Strait

Abstract Recent research hypothesised that the Siculo-Tunisian Strait might fit, at least for some species, picture of a genetic transitional zone instead sharp break between Western and Eastern Mediterranean basins. The present study aimed using common Octopus, Octopus vulgaris as an empirical test-case to evaluate this hypothesis. To accomplish goal, 458 new sequences mitochondrial gene cytochrome c oxidase subunit I were used. Combining with those available on public databases, we assembled dataset containing 920 investigate spatial patterns across 34 populations O. . structure species was assessed combining analysis molecular variance Median-Joining networks. Results supported hypothesis complex pattern Sicilian channel. Contemporary factors, such marine currents, likely affect species’ structuring area. Overall, our results highlighted focusing attention whole area rather than unique help detect similar different species. Finally, acknowledging occurrence zones may improve stock identification management practices commercially valuable