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

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Abstract

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.

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Acknowledgments

This study was supported by the State Key Program of National Natural Science of China (Grant No. 30930067/C120110).

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Authors and Affiliations

  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

    Zhangbao Chen, Zeyang Zhou, Xia Peng, Heng Xiang, Shaoneng Xiang & Zhenxian Jiang

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  1. Zhangbao Chen
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  2. Zeyang Zhou
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  3. Xia Peng
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  4. Heng Xiang
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  5. Shaoneng Xiang
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Correspondence to Zeyang Zhou.

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Chen, Z., Zhou, Z., Peng, X. et al. Effects of wet and dry seasons on the aquatic bacterial community structure of the Three Gorges Reservoir. World J Microbiol Biotechnol 29, 841–853 (2013). https://doi.org/10.1007/s11274-012-1239-3

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  • DOI: https://doi.org/10.1007/s11274-012-1239-3

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