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Tire wear particles drive size-dependent loss of freshwater bacterial biofilm diversity
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Researchers placed tire wear particles of different sizes and types in the River Rhine for four weeks and studied the bacterial communities that formed on them. They found that tire wear particles supported significantly less diverse bacterial communities compared to natural river sediment, with larger particles reducing diversity even further. The study reveals that the widespread release of tire wear particles into freshwater systems may be reshaping microbial ecosystems by favoring certain specialized bacteria over others.
Tire wear particles (TWPs) represent a significant, yet understudied, source of anthropogenic pollution in aquatic environments, contributing to microplastic contamination and potentially altering microbial ecosystems. As TWPs are continuously released through abrasion during vehicle use, they accumulate in rivers and sediments, where they can act as surfaces for microbial biofilm formation. In this study, we investigated how TWP characteristics - particle size (small & large), wear condition (unused & used), and vehicle type (car & truck) - affect microbial biofilm composition after four weeks of exposure in the River Rhine, compared to natural sediment. Using 16S rRNA amplicon sequencing, we found that TWP-associated biofilms harboured significantly lower bacterial diversity than natural sediment biofilms. While a substantial number of OTUs were shared between both habitats, TWPs exhibited increased richness but decreased overall diversity, indicating selective enrichment of specialized taxa. Larger particles further reduced diversity, and specific genera such as Aquabacterium and Ketobacter were highly enriched on TWPs, indicating selective microbial colonization. These findings reveal the effects of TWPs on microbial biofilm communities, emphasizing their potential role in altering freshwater microbial ecosystems. Given the widespread release of TWPs, understanding their ecological impact is crucial for assessing their role in aquatic pollution and ecosystem functioning.
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Cryogenically milled tire tread induces functional and structural changes in natural periphyton communities
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Tiny particles that flake off tires as they wear down are washing into rivers and streams, and this study found they harm the algae and bacteria communities that form the base of the aquatic food chain—reducing certain species by up to 85% while letting others take over. Since these microorganisms support the fish and other wildlife further up the chain, disrupting them could ripple through waterways that many communities depend on for drinking water and recreation. While this study didn't test human health effects directly, it adds to growing evidence that tire particles—one of the most common sources of microplastic pollution—can meaningfully alter aquatic ecosystems.
Size-dependent ecotoxicological impacts of tire wear particles on zebrafish physiology and gut microbiota: Implications for aquatic ecosystem health
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Researchers found that tire wear particles, a major but often overlooked source of microplastic pollution, affect zebrafish health differently depending on particle size. Smaller particles caused more severe gut microbiome disruption, oxidative stress, and immune responses, suggesting that tire-derived microplastics in waterways may pose a greater health risk to aquatic life than previously recognized.
Microbial community shifts induced by plastic and zinc as substitutes of tire abrasion
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Researchers tested the effects of plastic particles and zinc separately on a freshwater microeukaryotic community using high-throughput 18S rRNA sequencing, using these as surrogates for tire wear particle components. Both plastic and zinc individually altered community composition at environmentally realistic concentrations, with plastic causing more pronounced shifts in community structure.
A comparative analysis of the chemical composition and biofilm formation on tire wear particles from six different tire types
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Researchers analyzed the chemical composition and biofilm communities forming on tire-wear particles compared to other microplastic types, finding that tire wear particles support distinct microbial assemblages. The unique surface chemistry of tire wear particles may promote the attachment of pathogens and toxin-producing microorganisms.
Effects of tire wear particles on freshwater bacterial-fungal community dynamics and subsequent elemental cycles using microcosms.
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Researchers conducted freshwater microcosm experiments to assess how tire wear particles (TWPs) affect bacterial-fungal community dynamics and biogeochemical cycles in rural versus urban lake sediments and overlying water. They found TWPs altered microbial composition more strongly in water than sediment and increased bacteria-fungi network complexity, with cascading effects on nitrogen and carbon cycling.
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