Bacterial diversity in surface water of the Yellow Sea during and after a green alga tide in 2008 |
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Authors: | Cong Guo Fuchao Li Peng Jiang Zhaopu Liu Song Qin |
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Institution: | (1) Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Rd., Qingdao, 266071, People’s Republic of China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China;(3) University of New Brunswick, P.O. Box 5050, Saint John, NB, E2L 4L5, Canada; |
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Abstract: | From May to August 2008, a large “green tide”, consisting of the alga Ulva (Enteromorpha) prolifera, occurred in the Yellow Sea, China, affecting the local marine ecosystem and human activities. We investigated the influence
of the green tide on the microbial community in the surface seawater, at four sites from July to August 2008, using bacterial
16S rRNA gene clone libraries. We sequenced 228 clones of unique patterns identified by restriction fragment length polymorphism
(RFLP) techniques. The results show that 228 sequenced clones fell into six bacterial phyla: Proteobacteria, Bacteroidetes,
Cyanobacteria, Verrucomicrobia, Actinobacteria, and Planctomycetes. Alphaproteobacteria (33%), Gammaproteobacteria (25%),
Bacteroidetes (23%) and Cyanobacteria (9%) dominated the assemblage. Comparison between samples collected in July (during
the tide) and those collected in August (after the tide) showed that, in the microbial community, diversities of Alphaproteobacteria
and Cyanobacteria increased after the tide, while those of Gammaproteobacteria and Bacteroidetes decreased. These results
indicate that the green tide influenced the growth of some bacteria, and provide information for further studies on the interactions
and relationships between U. prolifera and the bacterial community. This study suggests that microbial community analysis is a good approach to monitoring green
tides. |
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