Effects of point and nonpoint source pollution on urban rivers: From the perspective of pollutant composition and toxicity

Liu, Yuxuan; Su, Bei; Mu, Hongxin; Zhang, Yu; Chen, Ling; Wu, Bing

doi:10.1016/j.jhazmat.2023.132441

Cited by 6 publications

(1 citation statement)

References 45 publications

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“…However, in recent decades, human activities such as rapid urbanization, industrialization and agriculture has discharged multiple anthropogenic contaminants and non-native (exotic) microorganisms into the river through industrial discharge, agricultural runoff, and municipal sewage (Wang et al 2012, Beattie et al 2020). These contaminants can be either organic (e.g., antibiotics, polycyclic aromatic hydrocarbons, fertilizers, pesticides, manure) (Singh et al 2019, Patel et al 2020, Liu et al 2023, Xu et al 2023) or inorganic contaminants (e.g., nitrate, phosphorus, heavy metal) (Pruden et al 2012, Manyi-Loh et al 2016, Yang et al 2022). At the same time, river sediments often act as the recipients of reservoirs for contaminants influenced by human activity inputs.…”

Section: Introductionmentioning

confidence: 99%

Urban non-point source pollutants cause microbial community homogenization via increasing deterministic processes

Li,

Fan,

et al. 2023

Preprint

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Rivers have been a preferred location for human settlements throughout history. Comparing the bacterial and archaeal communities in highly human-impacted areas and undisturbed pristine nature reserves could expand our understanding of the mechanisms of river ecosystem responses to environmental changes resulting from anthropogenic contaminants. In this study, 24 urban and 28 nature reserve river sediment samples were collected in a highly connected river network spanning ∼400 km, and their geobiochemistry profiles and microbial populations were investigated. The data showed that human activities had discharged significant amounts of nutrients and even exotic microorganisms into the river, resulting in significant changes in the microbial community and potential function, including an increase in pathogens, antibiotic-resistant bacteria and PAHs-degrading bacteria. Environmental selection was more important than dispersal limitation in the river network, and environmental factors were the best predictors of the variation observed between microbial communities. Specifically, homogeneous selection imposed by anthropogenic pollution stress lead to higher microbial diversity but a lower habitat niche breadth in urban river areas. Collectively, the study suggests that community composition and diversity dynamics of the river network are not random but driven by environmental factors. The natural buffering capacity of highly connected river network ecosystems is unable to fully resist the impacts from human activity pressures.HighlightIncreased bacterial and archaeal diversity was provoked by multiple anthropogenic pollutants in the river network.Sewage discharge and high nitrogen loadings reshaped the microbial composition in urban areas. Homogeneous selection imposed by anthropogenic pollution stress primarily shaped assembly of bacterial and archaeal.Environmental factors contribute more to the microbial variation than dispersal in the study area.

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