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Toxins 2018, 10(8), 315; https://doi.org/10.3390/toxins10080315

Variations of Bacterial Community Composition and Functions in an Estuary Reservoir during Spring and Summer Alternation

1
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
NUS Environmental Research Institute (NERI), National University of Singapore, Singapore 138602, Singapore
3
Department of Civil and Environmental Engineering, National University of Singapore, Singapore 138602, Singapore
*
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 31 July 2018 / Accepted: 3 August 2018 / Published: 6 August 2018
(This article belongs to the Special Issue Cyanobacteria and Cyanotoxins: New Advances and Future Challenges)
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Abstract

In this study, we focused on the dynamics of bacterial community composition in a large reservoir in the Yangtze estuary during spring and summer seasons, especially the variations of functional mechanisms of microbial community during the seasonal alternation between spring and summer. Both 16S rRNA gene sequencing and shotgun metagenomic sequencing technology were used for these purposes. The results indicated that obvious variations of bacterial community structures were found at different sites. Particle-associated bacterial taxa exhibited higher abundance at the inlet site, which was closer to the Yangtze River with a high level of turbidity. In other sites, Synechococcus, as the most dominant cyanobacterial species, revealed high abundance driven by increased temperature. Moreover, some heterotrophic bacterial taxa revealed high abundance following the increased Synechococcus in summer, which indicated potential correlations about carbon source utilization between these microorganisms. In addition, the shotgun metagenomic data indicated during the period of seasonal alternation between spring and summer, the carbohydrate transport and metabolism, energy production and conversion, translation/ribosomal biogenesis, and cell wall/membrane/envelope biogenesis were significantly enhanced at the exit site. However, the course of cell cycle control/division was more active at the internal site. View Full-Text
Keywords: reservoir; Yangtze estuary; 16S rRNA gene sequencing; shotgun metagenomic sequencing; bacterial community; microbial metabolisms reservoir; Yangtze estuary; 16S rRNA gene sequencing; shotgun metagenomic sequencing; bacterial community; microbial metabolisms
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Xu, Z.; Te, S.H.; Xu, C.; He, Y.; Gin, K. .-H. Variations of Bacterial Community Composition and Functions in an Estuary Reservoir during Spring and Summer Alternation. Toxins 2018, 10, 315.

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