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61,005 resultsShowing papers similar to Spatiotemporal variability and key influencing factors of river fecal coliform within a typical complex watershed
ClearSpatio and temporal dynamics of microplastic fluxes within the watercourses of a peri-urban watershed
Researchers tracked the spatiotemporal dynamics of microplastic fluxes within a river catchment over time, linking plastic transport patterns to land use activities. The study found that land use type is a key driver of when and how much microplastic enters and moves through watercourses.
Faecal contamination and its relationship with some environmental variables of four urban rivers in inner Hanoi city, Vietnam
Researchers assessed faecal coliform contamination and its relationship with physico-chemical variables in four urban rivers in inner Hanoi from 2020 to 2022, finding severe contamination exceeding Vietnamese water quality standards with significant correlations between bacterial levels and nutrient concentrations.
Abundance, Distribution and Drivers of Microplastic Contaminant in Urban River Environments
Researchers surveyed microplastic distribution in urban river environments and identified key drivers of accumulation hotspots, finding that land use, hydrology, and infrastructure factors concentrated microplastics at predictable locations that could inform targeted management interventions.
Dynamics of microplastics in urban rivers under varying hydrological regimes
Monitoring of urban rivers showed that microplastic concentrations fluctuate significantly with varying hydrological conditions such as storm events and seasonal flow changes. Understanding these dynamics is essential for accurately characterizing the river microplastic load and its variability over time.
Longitudinal patterns of microplastic concentration and bacterial assemblages in surface and benthic habitats of an urban river
This study measured microplastic concentrations and microbial communities in a river from source to mouth, finding that both plastic levels and unique plastisphere bacterial communities increased downstream of wastewater treatment plant outflows. The results identify wastewater discharge as a key driver of both microplastic loading and microbial community shifts in rivers.
Persistence of Fecal Indicators and Microbial Source Tracking Markers in Water Flushed from Riverbank Soils
The persistence of fecal indicator bacteria and the human-specific Bacteroides HF183 marker was measured in water flushed from riverbank soils to assess how long these indicators remain detectable after contamination events. The study provides data relevant to interpreting fecal pollution signals in river systems affected by sewer exfiltration and stormwater overflow.
Advancing Quantitative Understanding of Escherichia Coli Concentrations in a Contemporary Mixed Land-Use Watershed, in West Virginia, USA
This watershed study investigated E. coli concentrations and their relationship to land use, water chemistry, and suspended particles across 22 sites in West Virginia. It is a water quality study focused on fecal bacteria rather than microplastic contamination.
Integrating land cover, point source pollution, and watershed hydrologic processes data to understand the distribution of microplastics in riverbed sediments
Researchers sampled riverbed sediments across the Meramec River watershed in Missouri and applied hydrological modelling to assess which factors best predict benthic microplastic distribution, finding that land cover and point source pollution variables outperformed discharge and sediment load in explaining spatial patterns, highlighting the dominance of anthropogenic sources over transport dynamics.
Trapping and bypassing of suspended particulate matter, particulate nutrients and faecal indicator organisms in the river-estuary transition zone of a shallow macrotidal estuary
Researchers studied how suspended particles — including nutrients and fecal bacteria — move through the zone where a river meets an estuary, finding that tides, seasons, and river flood events all drive complex patterns of particle transport. The study reveals that this river-estuary transition zone acts more as a particle conduit than a long-term trap, with implications for water quality monitoring.
Microplastic in surface waters of urban rivers: concentration, sources, and associated bacterial assemblages
Researchers measured microplastic levels in the surface waters of the Chicago River and its urban tributaries, finding concentrations as high as 1.94 particles per cubic meter near wastewater outflows. They discovered that microplastic fibers and pellets were often colonized by bacterial communities distinct from those in the surrounding water. The study provides early evidence that urban rivers are significant conduits for microplastic pollution and that these particles may serve as rafts for microorganisms.
Urban non-point source pollutants cause microbial community homogenization via increasing deterministic processes
This study found that non-point source pollutants from urban areas homogenize microbial communities in rivers by increasing the dominance of deterministic processes over random ones. Microplastics from urban runoff are among the non-point source pollutants that can alter aquatic microbial diversity.
Spatial Persistence of Water Chemistry Patterns Across Flow Conditions in a Mesoscale Agricultural Catchment
This study found that spatial patterns in river water chemistry remain consistent across different flow conditions in an agricultural watershed. Persistent spatial patterns in pollution distribution could help predict where microplastics and other contaminants concentrate in river systems.
Anthropogenic particle concentrations and fluxes in an urban river are temporally variable and impacted by storm events
Researchers measured anthropogenic particle concentrations and deposition fluxes in an urban river over time, finding that particle loads were strongly driven by storm events rather than baseline flow conditions. During storm events, particle concentrations increased by an order of magnitude, identifying stormwater runoff as the dominant pathway delivering anthropogenic particles including microplastics to urban rivers.
Spatiotemporal dynamics of microplastics in an urban river network area
Researchers investigated microplastic dynamics in an urban river network in eastern China, finding abundances of 2.3 to 104.6 particles per liter that were significantly higher during wet seasons and concentrated near commercial, industrial, and wastewater discharge areas.
Spatial and temporal variations of microplastic concentrations in Portland's freshwater ecosystems
Microplastic concentrations were monitored across Portland's urban freshwater ecosystems, revealing that land use, stormwater inputs, and seasonal variation all influenced plastic levels in rivers and streams. The study found that urban catchments with higher impervious surfaces consistently showed elevated microplastic concentrations.
Urbanization and hydrological conditions drive the spatial and temporal variability of microplastic pollution in the Garonne River
Researchers quantified microplastic concentrations across 14 sites in the Garonne River catchment in France, finding that urbanization drives spatial variation while seasonal hydrology shapes temporal patterns—with higher concentrations and smaller particles in warm, low-flow periods—and polyethylene, polystyrene, and polypropylene dominating polymer composition.
Variance and precision of microplastic sampling in urban rivers
Researchers assessed the variance and precision of microplastic sampling methods in urban rivers, finding that high spatial and temporal variability in microplastic concentrations requires carefully designed sampling strategies to obtain representative measurements and reliable data for river microplastic assessments.
Modeling Contaminant Microbes in Rivers During Both Baseflow and Stormflow
A mobile-immobile transport model was developed to simulate how fecal bacteria and pathogens travel in rivers during both low-flow and storm conditions, incorporating attachment, detachment, and inactivation processes. The model improves predictions of microbial contamination risk in river systems and can guide drinking water and recreational water safety assessments.
Interactive effect of urbanization and flood in modulating microplastic pollution in rivers
Researchers sampled the Garonne River upstream and downstream of a large urban area during flood events and found that microplastic concentrations increased 5 to 8 fold during floods. The study suggests that urbanization significantly modulates freshwater microplastic pollution during flood episodes, with downstream urban sites showing greater changes in microplastic composition and degradation levels.
Spatial and temporal variability in in-stream microplastic loads can impact downstream plastic export
This study demonstrated that microplastic loads in streams show significant spatial and temporal variability driven by storm events and seasonal patterns, and that these dynamics can strongly influence the total plastic export from river systems to downstream waters.
Influence of Urbanization and Seasonality on Microplastics in a Small Brazilian Inland Stream
Researchers sampled a small Brazilian inland stream upstream and downstream of an urban center during dry and rainy seasons, finding urbanization significantly increased microplastic abundance from 1.7 to 2.6 particles per liter during the dry season, while rainfall effects were less consistent.
A case study investigating temporal factors that influence microplastic concentration in streams under different treatment regimes
Microplastic concentrations in streams fluctuate significantly over time, influenced by rainfall events and seasonal factors, which can make single-sample studies misleading. The study emphasizes the need for repeated, time-series sampling to accurately assess microplastic pollution in rivers.
Watershed urbanization enhances the enrichment of pathogenic bacteria and antibiotic resistance genes on microplastics in the water environment
Researchers compared microplastic biofilm communities (the plastisphere) across watersheds with different levels of urbanization, finding that higher urbanization enriched pathogenic bacteria and antibiotic resistance genes on plastic surfaces in waterways. The study suggests that urban runoff substantially elevates the health risk posed by microplastics as vectors of pathogens and antimicrobial resistance.
Particle-Associated Contaminant Transport in Rivers during High Discharge Events
Researchers examined suspended river sediments during high discharge events for the presence of anthropogenic particles including microplastics and tyre wear particles, as well as their co-transport with organic pollutants including PFAS and polycyclic aromatic hydrocarbons, in an urbanizing catchment context.