Seasonal Dynamics of Marine Microbial Community in the South Sea of Korea |
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| Authors: | Sung-Suk Suh Mirye Park Jinik Hwang Eui-Joon Kil Seung Won Jung Sukchan Lee Taek-Kyun Lee |
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| Affiliation: | 1. South Sea Environment Research Department, Korea Institute of Ocean Science and Technology, Geoje, 656–830, Republic of Korea.; 2. Korea University of Science and Technology, Daejeon, 305–350, Republic of Korea.; 3. Department of Genetic Engineering Sungkyunkwan University, Suwon, 440–746, Republic of Korea.; University of New South Wales, AUSTRALIA, |
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| Abstract: | High-resolution 16S rRNA tag pyrosequencing was used to obtain seasonal snapshots of the bacterial diversity and community structure at two locations in Gosung Bay (South Sea, Korea) over a one year period. Seasonal sampling from the water column at each site revealed highly diverse bacterial communities containing up to 900 estimated Operational Taxonomic Units (OTUs). The Alphaproteobacteria and Gammaproteobacteria were the most abundant groups, and the most frequently recorded OTUs were members of Pelagibacter and Glaciecola. In particular, it was observed that Arcobacter, a genus of the Epsilonproteobacteria, dominated during summer. In addition, Psedoalteromonadaceae, Vibrionaceae and SAR11-1 were predominant members of the OTUs found in all sampling seasons. Environmental factors significantly influenced the bacterial community structure among season, with the phosphate and nitrate concentrations contributing strongly to the spatial distribution of the Alphaproteobacteria; the Gammaproteobacteria, Flavobacteria, and Actinobacteria all showed marked negative correlations with all measured nutrients, particularly silicon dioxide and chlorophyll-a. The results suggest that seasonal changes in environmental variables contribute to the dynamic structure of the bacterial community in the study area. |
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