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Accumulation of polypropylene microplastics within freshwater substrate biofilms alters microbial assembly processes and functionality
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Tiny plastic bits called microplastics build up in the slimy biofilms that coat rocks and plants in rivers and lakes—and these biofilms are crucial for keeping water ecosystems healthy by cycling nutrients and filtering pollutants. When microplastic levels get high enough, they damage the microbes' cells, reduce the diversity of helpful bacteria, and disrupt important chemical processes, which could weaken the natural water-cleaning systems we all depend on. While this study looked at freshwater ecosystems rather than humans directly, it's a reminder that plastic pollution can quietly break down the environ
Freshwater biofilms are vital to biogeochemical cycling in aquatic ecosystems. However, there has been limited in-depth investigation into the impact of polypropylene microplastics (PP-MPs)- newly emerging pollutants-on their functional performance. This study investigated the effects of PP-MPs on the physiology, community structure, and functional performance of freshwater biofilms. Experimental analyses were conducted to assess the accumulation of 200 μm PP-MPs by biofilms, along with physiological and ecological responses, and alterations in microbial community structure and function. The results demonstrated significant accumulation of PP-MPs by biofilms, with the MP concentration within biofilms increasing with water-column MP concentration, yet reaching a saturation threshold when the water-column concentration reached 150 mg/L. Physiological assessments revealed that low-concentration PP-MPs (≤100 mg/L) promoted extracellular polymeric substance (EPS) secretion, whereas high concentrations (≥150 mg/L) suppressed EPS production and decreased chlorophyll-a content, suggesting a potential negative effect on photosynthetic activity and carbon fixation. Elevated lactate dehydrogenase (LDH) activity indicated cell membrane damage under high PP-MPs exposure conditions. Microbial community analysis revealed that high concentrations of PP-MPs significantly reduced biofilm α-diversity and modified the relative abundance of dominant phyla (e.g., Cyanobacteria and Proteobacteria), suggesting potential effects on carbon, nitrogen, iron, and phosphorus cycling. Functional profiling further revealed disruptions in key metabolic pathways, including pentose metabolism and unsaturated fatty acid biosynthesis. These findings provide critical insights into the ecological risks of PP-MPs in freshwater ecosystems.
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Biofilm formation and its implications on the properties and fate of microplastics in aquatic environments: A review
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Researchers reviewed how microplastics in water attract and support communities of bacteria and other microorganisms that form biofilms — living coatings that alter the plastic particles' movement, help them carry pathogens, and affect how toxic chemicals attached to the plastic are absorbed by living things. Understanding this "plastisphere" ecosystem is critical for predicting where microplastics go and how harmful they become.
Influence of urban wastewaters and rainfall runoffs on community composition and function of river biofilms: a focus on nanoplastics.
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Scientists studied slimy microbial communities (biofilms) and mussels living in a river near Montreal to see how sewer overflows and wastewater affect their ability to deal with tiny plastic particles (nanoplastics). They found that pollution hotspots—especially areas hit by combined sewer overflows during storms—had the most nanoplastic contamination, but also boosted the microbes' and mussels' ability to break down plastic, suggesting nature has some built-in capacity to respond to plastic pollution. This matters because these mussels and biofilms sit at the base of the food chain, so understanding how they handle plastic p
Microplastics disrupt microbial functions in aquatic ecosystems
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Microplastics in water don't just sit passively — they rapidly become colonized by microorganisms, forming the "plastisphere," and this can fundamentally alter how aquatic ecosystems function. This review synthesizes evidence that microplastics and their associated biofilms can carry pathogens, harmful algae, and chemical pollutants, while also disrupting critical processes like nitrogen cycling and photosynthesis in rivers, lakes, and coastal waters. The authors identify significant gaps in understanding what happens when microplastics interact with oils and other hazardous substances, which is an urgent frontier for future research.
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.
Microbial Colonization and Biofilm Formation on Microplastics
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Tiny plastic particles floating in water and soil aren't just pollution—they're also becoming homes for bacteria, forming a slimy coating called a "biofilm." Scientists found these plastic-dwelling microbial communities can include harmful germs and can soak up toxic heavy metals and chemicals, potentially turning microplastics into tiny rafts that carry pollutants and disease-causing bacteria through the environment. This matters because as microplastics keep spreading, they may be helping spread harmful microbes and toxins too—something researchers say needs more study to understand the risks to human health.
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