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Seasonal variation in plastic-associated biofilm microbial assemblages: a microcosm approach
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Plastic trash floating in the ocean doesn't stay bare for long — it quickly gets coated in a slimy layer of bacteria, and this study found that certain plastics (specifically "oxo-degradable" ones marketed as more eco-friendly) actually attract more microbial growth, while seasonal changes in water salinity and nutrients also shape which bacteria show up. Concerning bacteria like Vibrio (which can cause food poisoning and infections) and coliforms were found at low levels but stuck around even when conditions weren't ideal, suggesting plastic debris in waterways could act as a floating vehicle
Plastic pollution in natural ecosystems creates novel niches, known as the "Plastisphere", that host heterogeneous microbial communities shaped by substrate type and environmental conditions. This study explored the effects of seasonal variation on the plastisphere evolution on different plastic substrates, oxo-degradable carrier bags (Oxo), oxo-degradable garbage bags (Oxo-G), normal plastics (N), and snack packets (Sn) for 30 days in a microcosm experiment using ambient water from the monsoon-influenced Zuari estuary. The results indicated that the early-stage (day 5) plastisphere was dominated by fast-growing r-strategists, such as Alpha- and Gamma-proteobacteria as well as Campylobacterota-related lineages, whereas mature biofilms (day 30) showed increased abundance of secondary colonisers, including Planctomycetota, Actinomycetota, and Bacteroidota. The oxo-degradable plastics emerged as preferred substrates, likely due to their prooxidant-mediated abiotic degradation and the novel nature of the conditioning film. Salinity, in conjunction with nutrient concentrations, emerged as a major driver of microbial abundance in the plastisphere. Though the putative pathogens, such as Vibrio spp. and total coliforms, were present at very low abundance in the aged plastisphere during the SW-Mon and PostM seasons, their persistence indicates their resilience even under nutrient-limited conditions. Although a closed microcosm system probably introduced bottle effects, influencing temporal changes in nutrient levels and microbial abundance, the study provides baseline insights into substrate- and season-driven patterns of plastisphere development. Overall, these findings underscore the dynamic interplay among various factors, including plastic types and seasonal environmental shifts, in shaping plastisphere maturation. This has potential implications for public health and ecosystem functioning in the natural marine environment. Employing functional metagenomics analysis in future in situ studies of plastisphere communities can provide further insights and is a way forward for predicting associated ecological risks.
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Plastisphere composition in a subtropical estuary: Influence of season, incubation time and polymer type on plastic biofouling
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Scientists studied the communities of bacteria, fungi, and other tiny organisms that grow on plastic debris floating in a Brazilian estuary over a full year. They found that these plastic-riding hitchhikers included potential disease-causing germs that can harm fish, shrimp, and algae, including species we eat, and that the mix of organisms changed with the seasons rather than the type of plastic. This matters because plastic waste in our waterways isn't just physical pollution, it can act as a raft for harmful microbes, potentially spreading disease through seafood and aquatic ecosystems that humans depend on.
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.
Bacterial Abundance, Diversity and Activity During Long-Term Colonization of Non-biodegradable and Biodegradable Plastics in Seawater
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Biofilm communities on conventional (polyethylene and polystyrene) and biodegradable plastics were tracked over 7 months of seawater immersion, finding highly abundant and diverse plastisphere communities on all polymer types but limited evidence of active plastic biodegradation under natural marine conditions.
Characterization of Microplastic-Associated Biofilm Development along a Freshwater-Estuarine Gradient
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Researchers characterized biofilm bacterial communities on three types of microplastics incubated along a freshwater-estuarine gradient, finding that salinity and plastic type influenced microbial community composition and succession over a 31-day period.
Dynamics and implications of biofilm formation and community succession on floating marine plastic debris
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Researchers examined how biofilms form on plastic debris in aquatic environments and how the resulting microbial communities evolve over time, finding that the plastisphere hosts distinct microbial assemblages including potential pathogens. The study has implications for understanding plastic debris as a vector for microbial dispersal.
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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.