Abstract
Abstract Nucleotide divergence in cytochrome c oxidase subunit I ( COI ) gene of mitochondrial DNA was analyzed to determine interpopulational variation of common octopus ( Octopus vulgaris ) species sampled along eastern Mediterranean. Nucleotide composition and nucleotide pair frequency analyses of 440 individuals representing 11 populations were investigated. Estimation of evolutionary divergence between sequences was conducted using Tamura-Nei model. Considering 440 individuals, 35 (5%) variable sites and an average variation of 1.9% were found between specimens. Highest divergence was found between Med11 and Med04-Med07 populations; with a genetic distance value of 0.039 (3.9%). Estimation of transition/transversion bias ( R ) was made under the Tamura-Nei model and resulted as 2.32. Phylogenetic tree was constructed using four methods: neighbor joining (NJ), minimum evolution (ME), maximum likelihood (ML) and unweighted pair-group method of arithmetic average (UPGMA). Results from clustering patterns of the consensus tree, with the sum of branch length = 0.05189, pointed out a correlation between genetic and geographic distance.
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