Effects of wet and dry seasons on the aquatic bacterial community structure of the Three Gorges Reservoir

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• 作者：Zhangbao Chen (1)
  Zeyang Zhou (1)
  Xia Peng (1)
  Heng Xiang (1)
  Shaoneng Xiang (1)
  Zhenxian Jiang (1)
  
• 关键词：Effects ; Bacterial community composition ; Three Gorges Reservoir ; Wet season ; Dry season
• 刊名：World Journal of Microbiology and Biotechnology
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：29
• 期：5
• 页码：841-853
• 全文大小：652KB
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• 作者单位：Zhangbao Chen (1)
  Zeyang Zhou (1)
  Xia Peng (1)
  Heng Xiang (1)
  Shaoneng Xiang (1)
  Zhenxian Jiang (1)
  
  1. Microbiology Division, Institute of Sericulture and Systems Biology, The Key Sericultural Laboratory of Agricultural Ministry, Southwest University, Tiansheng road, Beibei District, Chongqing, 400715, People’s Republic of China
  
• ISSN：1573-0972

文摘

This study investigated effects of wet and dry seasons on the bacterial community structure of the Three Gorges Reservoir by using denaturing gradient gel electrophoresis analysis of the PCR-amplified bacterial 16S rRNA gene. Bacterial diversity, as determined by the Shannon index, the Simpson’s index, and the Richness, dramatically changed in between the dry and wet seasons. The changes in the diversity and relative abundance of microbial populations among the five sites during the wet season have become more marked than those observed during the dry season. Furthermore, cluster analysis also showed these changes. The phylogenetic analysis indicated that Betaproteobacteria is the dominant population, followed by Actinobacterium, in both the wet season and dry season. The water quality parameters were quite stable at all five sites during the same season but noticeably varied from season to season. Canonical correspondence analysis also indicated that the changes in the bacterial community composition were primarily correlated with the variations in temperature, transparency, and the concentrations of NH4 +-N. Slight changes in bacterial community composition among the five sites during the dry season were correlated with different environments. However, during the wet season, major changes were correlated not only with environments, but also it may be associated with the bacterial populations from the surrounding areas and tributaries of the Three Gorges Reservoir.