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Quantification of Microplastics in North-Western Mediterranean Harbors: Seasonality and Biofilm-related Metallic Contaminants
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Researchers quantified microplastic concentrations in northwestern Mediterranean harbours across seasons. They found that microplastic abundance fluctuated with season and was influenced by factors such as rainfall, wind, and nearby human activities.
The Mediterranean Sea is one of the most impacted basin in terms of microplastics pollution. Land-based activities are the major sources of plastic litter to the ocean, with harbors probably representing significant hotspots. In the framework of the SPlasH! project (Stop alle Plastiche in H2O, Interreg Marittimo project), microplastics were sampled in three north-western Mediterranean harbors during summer and winter. In this study, the areal concentrations of microplastics ranged from 5,576 to 379,965 items.km-2. A decreasing gradient was observed from the inner to the outer zones of the studied harbors, pointing out these enclosed systems as hotspots regarding microplastic pollution. During the summer, because of an enhancement of port activities, the areal concentrations of microplastics were higher than in winter. The investigation microplastics size classes distribution in the surface waters revealed that microplastic within a size range between 300 µm and 500 µm were depleted. During this study, we assessed trace metal partitioning (Pb, Fe, Cu, V, Cd and As) between the dissolved phase and biofilm, thus highlighting concentrations within the biofilm two and six orders higher than those in the dissolved phase. This result strongly suggest trace metal bioaccumulation within the biofilm. When trace metal concentrations are normalized over the corresponding surface of microplastics and microplastics, higher values were obtained for microplastics evidencing their enhanced capacities to bioaccumulate contaminants with respect to macroplastics.
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Quantification of Microplastics in North-Western Mediterranean Harbors: Seasonality and Biofilm-Related Metallic Contaminants
AI summary Read the abstract
Scientists measured microplastic concentrations in three Mediterranean harbors across seasons, finding higher levels in summer (coinciding with peak boating activity) and detecting heavy metals associated with plastic biofilms. Harbors are identified as significant hotspots for microplastic pollution that spreads into surrounding coastal waters.
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Researchers monitored microplastic accumulation dynamics on two Mediterranean beaches with contrasting human pressures over multiple seasons, finding that beaches near urban areas accumulated MPs faster and showed greater concentration variability. Short-term accumulation events tied to storms and wind patterns were identified as key drivers of MP deposition.
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Researchers mapped microplastic distribution across multiple marine habitat types along the Mediterranean coast, examining spatial and temporal variability from the water surface to the sediment. The study revealed that microplastic abundance and composition differ substantially by habitat, underscoring the need for multi-compartment monitoring.
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Researchers surveyed microplastic abundance and polymer types across multiple compartments of a Mediterranean marine environment, documenting their presence from the sea surface to beach sediments and within marine organisms. The study adds to growing evidence that microplastics are pervasive throughout Mediterranean coastal ecosystems.
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