Microbial community shifts in streams receiving treated wastewater effluent.

Autor: Mansfeldt C; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland., Deiner K; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Natural History Museum London, London, UK. Electronic address: alpinedna@gmail.com., Mächler E; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland., Fenner K; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Department of Environmental Systems Science, ETH, Zürich, Switzerland; Chemistry Department, University of Zürich, Zürich, Switzerland., Eggen RIL; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Department of Environmental Systems Science, ETH, Zürich, Switzerland., Stamm C; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland., Schönenberger U; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland., Walser JC; Department of Environmental Systems Science, ETH, Zürich, Switzerland., Altermatt F; Eawag: Swiss Federal Institute of Aquatic Science and Technology, Dübendorf, Switzerland; Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich, Switzerland.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 Mar 20; Vol. 709, pp. 135727. Date of Electronic Publication: 2019 Dec 11.
DOI: 10.1016/j.scitotenv.2019.135727
Abstrakt: Wastewater treatment plant (WWTP) effluents release not only chemical constituents in watersheds, but also contain microorganisms. Thus, an understanding of what microorganisms are released and how they change microbial communities within natural streams is needed. To characterize the community shifts in streams receiving WWTP effluent, we sampled water-column microorganisms from upstream, downstream, and the effluent of WWTPs located on 23 headwater streams in which no other effluent was released upstream. We characterized the bacterial community by sequencing the V3-V4 region of the 16S rRNA gene. We hypothesized that the downstream community profile would be a hydraulic mixture between the two sources (i.e., upstream and effluent). In ordination analyses, the downstream bacterial community profile was a mixture between the upstream and effluent. For 14 of the sites, the main contribution (>50%) to the downstream community originated from bacteria in the WWTP effluent and significant shifts in relative abundance of specific sequence variants were detected. These shifts in sequence variants may serve as general bioindicators of wastewater-effluent influenced streams, with a human-gut related Ruminococcus genus displaying the highest shift (30-fold higher abundances downstream). However, not all taxa composition changes were predicted based on hydraulic mixing alone. Specifically, the decrease of Cyanobacteria/Chloroplast reads was not adequately described by hydraulic mixing. The potential alteration of stream microbial communities via a high inflow of human-gut related bacteria and a decrease in autotrophic functional groups resulting from WWTP effluent creates the potential for general shifts in stream ecosystem function.
Competing Interests: Declaration of competing interest The authors declare no conflicts of interest.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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