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Occurrence, Seasonal Variation and Risk Assessment of Antibiotics in Qingcaosha Reservoir
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Water 2018, 10(2), 154; doi:10.3390/w10020154

The Effects of Antibiotics on Microbial Community Composition in an Estuary Reservoir during Spring and Summer Seasons

School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
NUS Environmental Research Institute (NERI), National University of Singapore, Singapore 138602, Singapore
Department of Civil and Environmental Engineering, National University of Singapore, Singapore 138602, Singapore
Author to whom correspondence should be addressed.
Received: 23 November 2017 / Revised: 24 December 2017 / Accepted: 17 January 2018 / Published: 6 February 2018
(This article belongs to the Special Issue Antimicrobial Resistance in Environmental Waters)
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The increased antibiotic pollutants in aquatic environments pose severe threats on microbial ecology due to their extensive distribution and antibacterial properties. A total of 16 antibiotics including fluoroquinolones (FQs) (ofloxacin (OFX), ciprofloxacin (CFX), norfloxacin (NFX)), Sulfonamides (SAs) (sulfamonomethoxine (SMM), sulfadiazine (SDZ), sulfaquinoxaline (SQX)), Tetracyclines (TCs) (tetracycline (TC), doxycycline (DC)), β-lactams (penicillin G (PEN G), penicillin V (PEN V), cefalexin (LEX)), Macrolides (MLs) (erythromycin-H2O (ETM), tylosin (TYL)) and other antibiotics (Polymix-B (POL), Vancomycin (VAN), Lincomycin (LIN)) were detected in the surface water of the Qingcaosha Reservoir. Multivariate statistical analysis indicated that both water quality and physicochemical indexes have less contributions on variations of these antibiotics, suggesting the concentrations of antibiotics inside the reservoir are mainly affected by upstream runoff and anthropic activity along the river. Antibiotics including TYL, PEN G and ETM showed significant correlations with variations of bacterial community composition, and closely connected with various gram-negative bacteria in co-occurrence/exclusion patterns of the network, suggesting these bacterial taxa play important roles in the course of migration and transformation of related antibiotics. In conclusion, further research is required to evaluate the potential risk of genetic transfer of resistance to related bacteria induced by long-term exposure to low levels of antibiotics in the environment. View Full-Text
Keywords: bacterial community; co-occurrence pattern; antibiotics; estuary reservoir; surface water bacterial community; co-occurrence pattern; antibiotics; estuary reservoir; surface water

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xu, Z.; Jiang, Y.; Te, S.H.; He, Y.; Gin, K.Y.-H. The Effects of Antibiotics on Microbial Community Composition in an Estuary Reservoir during Spring and Summer Seasons. Water 2018, 10, 154.

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