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Assessment of Biofilm Growth on Microplastics in Freshwaters Using a Passive Flow-Through System
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Researchers developed a laboratory flow-through system to study how biofilms grow on microplastics under controlled freshwater conditions. They found that biofilm formation varied depending on the polymer type, water temperature, and nutrient levels, with warmer and more nutrient-rich conditions promoting faster colonization. The study provides a standardized method for assessing how microplastics in freshwater systems become platforms for microbial communities that could include harmful organisms.
Biofilms that colonize on the surface of microplastics (MPs) in freshwaters may pose a potential health risk. This study examined factors that influence MP-associated biofilm growth, including polymer type, degree of weathering, and source water quality. Weathered MPs produced in-lab were employed in biofilm trials conducted on site using a passive flow-through system with raw water at drinking water treatment facility intakes. Adenosine triphosphate (ATP) was used to quantify biofilm abundance; biofilm composition was assessed via metagenomic sequencing. Biofilm growth was observed on all polymer types examined and most prevalent on polyvinyl chloride (PVC), where ATP levels were 6 to 12 times higher when compared to other polymers. Pathogen-containing species including Salmonella enterica and Escherichia coli were present on all polymers with relative abundance up to 13.7%. S. enterica was selectively enriched on weathered MPs in specific water matrices. These findings support the need to research the potential accumulation of pathogenic organisms on microplastic surfaces.
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Wastewater-induced microplastic biofouling in freshwater: role of particle size and flow velocity
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This study examined how wastewater discharge promotes biofouling — the colonization of microplastics by microorganisms — in freshwater environments, finding that particle size and wastewater-derived nutrients both influenced biofilm formation rates and community composition. Wastewater-exposed microplastics rapidly developed distinct microbial communities.
Microplastic-specific biofilm growth determines the vertical transport of plastics in freshwater
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Researchers studied biofilm growth on five different microplastic polymer types in freshwater over 63 days to understand how biological colonization affects sinking behavior. The study found that biofilm growth is polymer-specific and can significantly alter the density of microplastic particles, which in turn determines whether they sink or float, influencing their vertical transport through freshwater systems.
Early colonization and temporal development of biofilms on microplastics: Influence of polymer type, season, and surrounding land use
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Researchers placed five types of plastic in urban rivers and lakes during winter and summer, tracking microbial communities that grew on them over 60 days. Bacterial communities changed over time and with season, plastic type, and surrounding land use, with biodegradable plastic showing distinct patterns and water pH linked to communities at later stages.
The role of biofouling and microbial colonization in shaping macroplastic fate in freshwaters
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Researchers ran a 12-week mesocosm experiment showing that biofouling by algae-dominated biofilms drives most tested plastics to sink in freshwater, with surface roughness governing colonization density and water quality — rather than polymer type — shaping the resulting microbial community.
The Effect of Microplastics on Microbial Succession at Impaired and Unimpaired Sites in a Riverine System
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Researchers compared microbial biofilm diversity on microplastic polymers and natural substrates at impaired and unimpaired riverine sites, examining how environmental nutrient loads, seasonality, and geography influence microbiome succession on plastic surfaces in freshwater ecosystems.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.