Microbial community composition in urban riverbank sediments: response to municipal effluents over spatial gradient

Author:

Guan Yidong12,Li Zhang3,Huang Lidong4,Luo Yin5ORCID,Fu Jie3

Affiliation:

1. a Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China

2. b Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, Hangzhou 310058, China

3. c School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

4. d College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China

5. e Department of Environmental Engineering, Wenhua College, Wuhan 430074, China

Abstract

Abstract Municipal effluents have adverse impacts on the aquatic ecosystem and especially the microbial community. This study described the compositions of sediment bacterial communities in the urban riverbank over the spatial gradient. Sediments were collected from seven sampling sites of the Macha River. The physicochemical parameters of sediment samples were determined. The bacterial communities in sediments were analyzed by 16S rRNA gene sequencing. The results showed that these sites were affected by different types of effluents, leading to regional variations in the bacterial community. The higher microbial richness and biodiversity at SM2 and SD1 sites were correlated with the levels of NH4+-N, organic matter, effective sulphur, electrical conductivity, and total dissolved solids (p < 0.01). Organic matter, total nitrogen, NH4+-N, NO3-N, pH, and effective sulphur were identified to be important drivers for bacterial community distribution. At the phylum level, Proteobacteria (32.8–71.7%) was predominant in sediments, and at the genus level, Serratia appeared at all sampling sites and accounted for the dominant genus. Sulphate-reducing bacteria, nitrifiers, and denitrifiers were detected and closely related to contaminants. This study expanded our understanding of municipal effluents on microbial communities in riverbank sediments, and also provided valuable information for further exploration of microbial community functions.

Funder

Fundamental Research Funds for the Central Universities

Innovative Research Group Project of the National Natural Science Foundation of China

Foundation for Outstanding Young Scientific and Technological Innovation Teams of Colleges and Universities in Hubei Province

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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