Impact of treated sewage effluent on the bacterial community composition in an intermittent mediterranean stream

The Effect of the Effluent from a Small-Scale Conventional Wastewater Treatment Plant Treating Municipal Wastewater on the Composition and Abundance of the Microbial Community, Antibiotic Resistome, and Pathogens in the Sediment and Water of a Receiving Stream

“…In general, the ARG abundances in water decreased along the distance gradient further downstream, and the WWTP effluent-associated sul1-sul2-aadA-blaOXA2 cluster became virtually undetectable (except for a minute amount of sul1 genes) from the 2.7 km location onward. The decrease of ARGs in stream water across a distance gradient from WWTP discharge has also been reported by other studies [33,37,42]. In the sediments, the changes in the structure of the resistome along a distance gradient indicated recovery from the impact of WWTP effluent as the proportions of sulfonamide, aminoglycoside, and betalactam resistance, as well as the of sul1-sul2-aadA-blaOXA2 cluster, gradually decreased, and in the river sediments 3.7 km downstream of WWTP, the resistome was remarkably similar to the resistome of the stream sediments upstream of the WWTP.…”

“…The results of this study showed that, in general, the changes in the microbial communities caused by effluent inflow were surprisingly similar in the water and sediments. For example, the proportion of organisms from the phylum Bacteroidetes, a taxon shown to be a common member of the wastewater communities [15,36,37], was elevated in water and sediments 0.3 km downstream of the WWTP discharge point. While the proportion of Bacteroidetes increased, the proportion of Actinobacteria decreased in the stream water and Deltaproteobacteria in sediment.…”

Benthic Biofilm Bacterial Communities and Their Linkage with Water-Soluble Organic Matter in Effluent Receivers

“…The bacterial diversity indices were found to increase in the discharge area and experienced a decrease downstream ( Figure 4 ), with significant changes in the richness and Shannon indices ( p < 0.05). Studies regarding the effects of effluent discharge on biofilm bacterial communities gave contradictory results, possibly due to either increasing or decreasing microbial diversity and enzyme activity [ 5 , 56 , 57 ]. In this study, the Discharge area and the Downstream groups had distinct responses to effluent discharge, reflected by the more vulnerable diversity and abundance of bacterial communities, while the diversity of bacterial communities in the Downstream group approached to the status observed in the Upstream group, implying that microbial ecological reconstruction of bacterial community occurred responding to effluent discharge [ 4 ].…”

Deciphering the influence of multiple anthropogenic inputs on taxonomic and functional profiles of the microbial communities in Yitong River, Northeast China

“…High abundance of freshwater Actinobacteria is ubiquitous in lakes with eutrophication (Wu et al, 2007;Debroas et al, 2009;Humbert et al, 2009;, but their abundance often decreases with decreasing oxygen concentrations (Allgaier and Grossart, 2006). Actinobacteria has been viewed as a water quality indicator on account of its sensitivity to the condition that causes blooms (Pascual-Benito et al, 2020). On account of agriculture, substances that contained N or P owed upstream and were stored by the reservoir with low liquidity; this situation might have caused the increase in Actinobacteria and Ilumatobacteraceae at the outlet.…”