Distribution Pattern of Bacteria in the Two Geographic Poles and Southern Ocean from the Reported 16S rDNA Sequences

16S rDNA bacterial sequences (913) from the Arctic Ocean, Southern Ocean and Antarctic Iceland were studied to understand the bacterial distribution pat-tern. Through phylogenetic study, it was observed that some bacteria were common in both the Arctic Ocean and Antarctic Iceland. γ-Proteobacteria occu-pied 77.7% of the total bacterial population in the Antarctic Iceland, whereas in the Southern Ocean it was 72.5% and in the Arctic Ocean it was 50.9%. GC (Guanine + Cytosine) content of the bacteria in the Arctic Ocean and Antarctic Iceland region was 54.4% and 53.8% respectively. Bacterial diversity was calcu-lated using Shannon-Weiner index and was found to be highest in the Antarctic Iceland (1.6926).