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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.
Marine plastics are increasingly recognised not only as pollutants but also as novel ecological substrates that host metabolically active microbial communities. This thesis investigated whether plastisphere assemblages simply accumulate biomass or actively structure ecological functionality across seasonal cycles in the Gulf of Naples. To address this, this study combined incubation experiments at Porticciolo Molosiglio with in- situ collection in the coastal system of the Gulf of Naples. This dual framework allowed the evaluation of the plastisphere-associated communities dynamics under natural hydrographic conditions, capturing summer stratification and winter mixing regimes. Functional assessment integrated exoenzymatic activities (leucine aminopeptidase, β-glucosidase, chitinase, and phosphatase), metabolic activities, microbial abundances, and community structure analysis. Across seasons, plastisphere communities consistently exhibited metabolic patterns distinct from the surrounding sea water. While free-living microbes were tightly coupled to pulses of labile dissolved organic matter, particularly during summer productivity, plastic-associated biofilms maintained a more diversified enzymatic allocation, investing not only in protein degradation but also in complex substrate processing. Season was the dominant driver of metabolic organisation, while polymer type showed to play a secondary role. Importantly, the incubation experiments demonstrated that plastic surfaces could support structured and active metabolic strategies even under non-limiting nutrient scenarios, suggesting that the physical stability contributed to functional organisation rather than only concentrating activity. By integrating enzymatic profiling with single-cell activity measurements, this work advances plastisphere research toward a mechanistic, activity-based understanding of microbial functionality. In doing so, this thesis work establishes a functional framework for understanding the plastisphere as an active ecological interface, opening the path towards a more mechanistic integration of microbial processes into assessments of plastic pollution in marine systems.
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Researchers estimated the microbial carrying capacity and carbon biomass of floating marine plastic debris, finding that the collective surface area of ocean plastic supports a substantial microbial community whose carbon biomass, while modest relative to total ocean microbial carbon, represents a novel and persistent ecological niche with potential biogeochemical significance.
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Researchers studied the communities of bacteria and fungi that colonize microplastic surfaces in freshwater and seawater, forming what scientists call the plastisphere. These microplastic-associated communities were distinctly different from those in surrounding water, and included a higher proportion of disease-causing organisms and species involved in pollutant degradation. The findings suggest that microplastics create new habitats that can harbor pathogens and alter natural microbial ecosystems in ways that may affect water quality and human health.
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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.
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Researchers investigated how microbial communities colonize different types of microplastic surfaces in natural marine environments over an eight-week period. They found that the composition of these plastic-associated microbial communities, known as the plastisphere, was shaped more by environmental conditions and time than by the specific type of plastic. The study provides new understanding of the ecological processes governing how microorganisms assemble on ocean plastic debris.
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