BACTERIAL COMMUNITY STRUCTURE OF THE PACIFIC OCEAN ALONG A TRANSECT FROM ALASKA TO THE ANTARCTIC PENINSULA VIA THE KOREAN PENINSULA

초록

The results showed that bacterial assemblages of surface water of the Pacific Ocean were dominated by Alphaproteobacteria, Gammaproteobacteria, Bacteroidetes, and Cyanobacteria. The SAR11 and SAR86 clades were prevalent in nearly all samples. The genus Prochlorococcus was abundant in oligotrophic areas of low-latitude regions but nearly undetectable in high-latitude regions. The Arctic96BD-19 (ZD0405) clade of the Gammaproteobacteria, NS groups of Bacteroidetes, and the marine Roseobacter clade of the Alphaproteobacteria were more abundant in high latitude regions. Ordination analyses based on beta-diversity indices and environmental parameters showed that the community structure of free-living bacteria of the Pacific Ocean changed according to oceanic provinces and was largely influenced by temperature, chlorophyll concentration, and salinity.