Do environmental pharmaceuticals affect the composition of bacterial communities in a freshwater stream? A case study of the Knivsta river in the south of Sweden

Hagberg, Aleksandra; Gupta, Shashank; Rzhepishevska, Olena; Fick, Jerker; Burmølle, Mette; Ramstedt, Madeleine

doi:10.1016/j.scitotenv.2020.142991

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…The larger proportion of sensitive than tolerant taxa in all treatments suggested that the microbial community was not robust to the persistence of micropollutants in its surroundings. Noteworthily, two strictly tolerant genera across treatments were Sphingomonas and Hydrogenophaga (Table S4 ), which have been shown to be enriched in the BPA or TCS-contaminated environments [ 67 , 70 , 71 ] and to produce enzymes capable of degrading different pollutants [ 72 ].…”

Section: Discussionmentioning

confidence: 99%

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Shen

Luo

et al. 2022

ISME Communications

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The increasing-volume release of micropollutants into natural surface waters has raised great concern due to their environmental accumulation. Persisting micropollutants can impact multiple generations of organisms, but their microbially-mediated degradation and their influence on community assembly remain understudied. Here, freshwater microbes were treated with several common micropollutants, alone or in combination, and then transferred every 5 days to fresh medium containing the same micropollutants to mimic the repeated exposure of microbes. Metabarcoding of 16S rRNA gene makers was chosen to study the succession of bacterial assemblages following micropollutant exposure. The removal rates of micropollutants were then measured to assess degradation capacity of the associated communities. The degradation of micropollutants did not accelerate over time but altered the microbial community composition. Community assembly was dominated by stochastic processes during early exposure, via random community changes and emergence of seedbanks, and deterministic processes later in the exposure, via advanced community succession. Early exposure stages were characterized by the presence of sensitive microorganisms such as Actinobacteria and Planctomycetes, which were then replaced by more tolerant bacteria such as Bacteroidetes and Gammaproteobacteria. Our findings have important implication for ecological feedback between microbe-micropollutants under anthropogenic climate change scenarios.

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Section: Discussionmentioning

confidence: 99%

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Shen

Luo

et al. 2022

ISME Communications

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show abstract

“…The larger proportion of sensitive than tolerant taxa in all treatments suggested that the microbial community was not robust to the persistence of micropollutants in its surroundings. Noteworthily, two strictly tolerant genera across treatments were Sphingomonas and Hydrogenophaga (Table S4), which have been shown to be enriched in the BPA or TCS-contaminated environments (Oh et al, 2019;Zaborowska et al, 2020;Hagberg et al, 2021) and to produce enzymes capable of degrading different pollutants (Gao et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Shen

Luo

et al. 2021

Preprint

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The high-volume release of micropollutants into natural surface waters has raised concern due to their environmental accumulation. Persisting micropollutants can impact multiple generations of organisms via press disturbances, but their microbially-mediated degradation and the influence on community assembly remain understudied. Here, freshwater microbial communities in microcosms were treated with four common micropollutants, alone or in combination, and then transferred in stages to fresh medium containing the same level of micropollutants to mimic the recurrent exposure of microbes under environmentally relevant conditions. Our results showed that the degradation of micropollutants was closely linked to the community succession, and that recurrent exposure to micropollutants enhanced the degradation capacity. The partitioning analysis of ecological processes revealed that community assembly was dominated by stochastic processes during early exposure, via random community changes, and by deterministic processes later in the exposure. Analyzing individual taxa abundances over time revealed two distinct bacterial responses, in which a larger proportion of sensitive than tolerant taxa was present in the disturbed communities, and the abundances of the most sensitive taxa were significantly associated with micropollutant degradation. This study clearly showed that microbial communities are generally vulnerable to persisting micropollutants in aquatic environments, which has important implications for pollution management, especially regarding microbial dynamics and ecosystem functioning in micropollutant removal.

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“…Betweenness centrality is combined with the post fire debris flow risk to measure the roadway vulnerability. The betweenness centrality is estimated using the network analysis toolkit NetworkX (Hagberg et al 2020). The roadway network, including interstates, arterials, and collectors, is retrieved from OpenStreetMap (OSM 2019).…”

Section: Roadway Criticality and Vulnerability Assessmentmentioning

confidence: 99%

Vulnerability of California roadways to post-wildfire debris flows

Chester

2023

Environ. Res.: Infrastruct. Sustain.

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Post-wildfire debris flows represent a significant hazard for transportation infrastructure. The location and intensity of post-fire debris movements are difficult to predict, and threats can persist for several years until the watershed is restored to pre-fire conditions. This situation might worsen as climate change forecasts predict increasing numbers of wildfire burned areas and extreme precipitation intensity. New insights are needed to improve understanding of how roadways are vulnerable to post-fire flows and how to prioritize protective efforts. Using California as a case study, the vulnerability of transportation infrastructure to post-fire debris flow was assessed considering geologic conditions, vegetation conditions, precipitation, fire risk, and roadway importance under current and future climate scenarios. The results showed significant but uneven statewide increases in the number of vulnerable roadways from the present to future emission scenarios. Under current climate conditions, 0.97% of roadways are highly vulnerable. In the future, the ratio of vulnerable roadways is expected to increase 1.9-2.3 times in the Representative Concentration Pathways (RCP) 4.5 emission scenarios and 3.5-4.2 times in the RCP 8.5 emission scenarios. The threat of post-fire debris flow varies across the state, as precipitation changes are uneven. The vulnerability assessment is positioned to 1) identify, reinforce, and fortify highly vulnerable roadways, 2) prioritize watershed fire mitigation, and 3) guide future infrastructure site selection.

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Do environmental pharmaceuticals affect the composition of bacterial communities in a freshwater stream? A case study of the Knivsta river in the south of Sweden

Cited by 16 publications

References 33 publications

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Repeated introduction of micropollutants enhances microbial succession despite stable degradation patterns

Vulnerability of California roadways to post-wildfire debris flows

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