| Biotechnology |
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| Bacterial and archaeal communities in the surface sediment from the northern slope of the South China Sea |
| Li LIAO, Xue-wei XU, Chun-sheng WANG, Dong-sheng ZHANG, Min WU |
| College of Life Sciences, Zhejiang University, Hangzhou 310058, China; Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China; The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China |
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Abstract Microbial diversity of sediments from the northern slope of the South China Sea was studied by constructing bacterial and archaeal 16S rRNA gene clone libraries. Fourteen bacterial phylogenetic groups were detected, including Gammaproteobacteria, Deltaproteobacteria, Planctomycetes, Alphaproteobacteria, Firmicutes, Bacteroidetes, Actinobacteria, Chloroflexi, Acidobacteria, Betaproteobacteria, Nitrospirae, candidate divisions OP8 and OP11, and an unknown group. Gammaproteobacteria was the predominant group in bacterial libraries with the percentage ranging from 31.8% to 63.2%. However, archaeal libraries had relatively lower diversity, with most clones belonging to marine archaeal group І uncultured Crenarchaeota. In addition, two novel euryarchaeal clones were detected not to match any culture-dependent or -independent isolates. Compared with other gas hydrate-rich ecosystems and different areas of the South China Sea, a distinct microbial community was revealed in this study.
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Received: 29 July 2009
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