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Open AccessArticle

Changes of Bacterial Communities in Response to Prolonged Hydrodynamic Disturbances in the Eutrophic Water-Sediment Systems

1
School of Environmental Science and Engineering, Yangzhou University, Yangzhou 225127, China
2
School of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225127, China
3
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China
4
School of Construction Equipment and Municipal Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221008, China
*
Authors to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2019, 16(20), 3868; https://doi.org/10.3390/ijerph16203868
Received: 10 September 2019 / Revised: 30 September 2019 / Accepted: 5 October 2019 / Published: 12 October 2019
(This article belongs to the Special Issue Water Quality Improvement and Ecological Restoration)
The effects of hydrodynamic disturbances on the bacterial communities in eutrophic aquatic environments remain poorly understood, despite their importance to ecological evaluation and remediation. This study investigated the evolution of bacterial communities in the water–sediment systems under the influence of three typical velocity conditions with the timescale of 5 weeks. The results demonstrated that higher bacterial diversity and notable differences were detected in sediment compared to water using the 16S rRNA gene sequencing. The phyla Firmicutes and γ-Proteobacteria survived better in both water and sediment under stronger water disturbances. Their relative abundance peaked at 36.0%, 33.2% in water and 38.0%, 43.6% in sediment, respectively, while the phylum Actinobacteria in water had the opposite tendency. Its relative abundance grew rapidly in static control (SC) and peaked at 44.8%, and it almost disappeared in disturbance conditions. These phenomena were caused by the proliferation of genus Exiguobacterium (belonging to Firmicutes), Citrobacter, Acinetobacter, Pseudomonas (belonging to γ-Proteobacteria), and hgcI_clade (belonging to Actinobacteria). The nonmetric multidimensional scaling (NMDS) and Venn analysis also revealed significantly different evolutionary trend in the three water-sediment systems. It was most likely caused by the changes of geochemical characteristics (dissolved oxygen (DO) and nutrients). This kind of study can provide helpful information for ecological assessment and remediation strategy in eutrophic aquatic environments. View Full-Text
Keywords: bacterial community; water disturbance; 16S rRNA; dissolved oxygen; nutrients; resuspension; racetrack-style flume; lake Chaohu; Exiguobacterium; hgcI_clade bacterial community; water disturbance; 16S rRNA; dissolved oxygen; nutrients; resuspension; racetrack-style flume; lake Chaohu; Exiguobacterium; hgcI_clade
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Cheng, H.; Cheng, L.; Wang, L.; Zhu, T.; Cai, W.; Hua, Z.; Wang, Y.; Wang, W. Changes of Bacterial Communities in Response to Prolonged Hydrodynamic Disturbances in the Eutrophic Water-Sediment Systems. Int. J. Environ. Res. Public Health 2019, 16, 3868.

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