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Microplastics as Selective Substrates for Marine Microorganisms: Beyond the Toxicological Paradigm
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This review paper suggests scientists should rethink how microplastics affect ocean bacteria and other tiny marine organisms: rather than simply poisoning them, plastics may act more like a food source that shapes which microbes thrive and how they behave. This matters because these microbial communities on plastic ("plastisphere") can influence ocean ecosystems and the breakdown of pollutants, which may indirectly affect seafood safety and marine environmental health that humans depend on.
Abstract Microplastics (MPs) are widely studied as marine contaminants, yet their ecological roles in microbial systems remain incompletely understood. Conventional toxicological frameworks, largely developed for multicellular organisms, emphasize acute stress and cellular damage but capture only a limited subset of microbial responses. Here, we propose a stage-structured framework in which MPs function primarily as selective substrates rather than as conventional toxicants. Plastisphere assembly is governed by dynamically shifting selection across three stages: initial physicochemical filtering, substrate- and metabolism-driven selection, and biofilm-mediated spatial adaptation. Central to this process is the coupling between substrate transformation and reactive oxygen species (ROS) dynamics. Extracellular ROS arise from interfacial reactions of weathered plastic compounds, while intracellular ROS are generated during microbial carbon assimilation. These processes are mechanistically linked: plastic-derived compounds act as both substrates and stressors, and extracellular ROS further transform them into more bioavailable forms, reinforcing intracellular constraints. Biofilms introduce spatial organization that redistributes metabolic and oxidative burdens, enabling metabolic cooperation, stress partitioning, and HGT, allowing selection to operate at both individual traits and spatially organized community levels. Together, this framework shifts the perspective from toxicity-based interpretations toward a selection paradigm that integrates substrate availability, metabolic constraints, and spatial organization, providing a mechanistic basis for linking microscale microbial processes to broader ecological and biogeochemical dynamics.
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Surfing and dining on the “plastisphere”: Microbial life on plastic marine debris
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This review examines the microbial communities — the "plastisphere" — that colonize floating plastic debris in the ocean, discussing how these biofilms form, who lives in them, and what risks they may pose to marine ecosystems and human health. The unique chemistry and buoyancy of plastic creates a novel habitat that can transport potentially harmful microbes across ocean basins.
Marine Plastisphere
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Plastic waste in the ocean isn't just floating debris — it's covered in living microbial communities, sometimes called the "plastisphere," that can include harmful bacteria and can carry pollutants through the marine food chain. This review pulls together current research on how these microbes grow on plastic and interact with ocean chemicals, highlighting concerns that this could help spread disease-causing germs and contaminants to seafood and, ultimately, to people. The authors note that scientists still don't fully understand how these microbial hitchhikers form or exactly how risky they are, so more research is needed before we can accurately assess the health risks.
Marine Microbial Assemblages on Microplastics: Diversity, Adaptation, and Role in Degradation
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This review examines microbial communities that colonize microplastics in the ocean, collectively known as the plastisphere. Researchers found that these biofilms differ significantly from those on natural surfaces and may include pathogenic bacteria and species capable of partially degrading plastics. The study highlights both the ecological risks of microplastics as vectors for harmful microbes and the potential for harnessing plastic-degrading organisms.
Functional Ecology of the Microbial Plastisphere
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Scientists found that floating ocean plastic isn't just pollution, it's also a surface where microbes set up shop and behave differently than microbes floating freely in seawater, breaking down complex materials in specialized ways. This matters because it means plastic debris may be creating new microbial hotspots in the ocean, potentially changing how nutrients and pollutants cycle through marine ecosystems that ultimately connect to our food and health.
It’s a matter of microbes: a perspective on the microbiological aspects of micro- and nanoplastics in human health
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Researchers highlighted an often-overlooked aspect of micro- and nanoplastic pollution: the microorganisms that colonize plastic particles and how they might affect human health. The study suggests that the microbial communities living on plastic surfaces, known as the plastisphere, could carry harmful bacteria into the human body through ingestion, inhalation, or skin contact, representing an additional health risk beyond the plastics themselves.
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