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Salt Marshes as Final Watershed Fate for Meso- and Microplastic Contamination: A Case Study from Southern Brazil
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Salt marshes as the final watershed fate for meso- and microplastic contamination: A case study from Southern Brazil
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Researchers found that salt marshes act as significant sinks for meso- and microplastics transported through a watershed, with plastic particles accumulating in marsh sediments at densities reflecting upstream land use — highlighting salt marshes as both indicators of catchment-wide plastic pollution and potential long-term reservoirs.
The Distribution and Characteristics of Microplastics in Coastal Beaches and Mangrove Wetlands
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Researchers investigated how microplastics accumulate in coastal beaches and mangrove wetlands, finding these ecosystems act as hotspots that trap plastic particles carried by ocean currents and tides, potentially threatening the marine life that depends on these sensitive habitats.
Microplastics Beach Pollution: Composition, Quantification and Distribution on the Southern Coast of Brazil
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Researchers quantified microplastic pollution on a southern Brazilian beach, finding an average of 650 MPs/kg of sediment with highest concentrations near the Mampituba River mouth, dominated by polyethylene, polypropylene, and polyamide particles in the 50–100 µm range. The findings confirm that riverine transport is a major pathway delivering microplastics to coastlines, underscoring the need for upstream source control to protect coastal ecosystems.
First Evidence of High Microplastic Concentrations in Estuarine Litter Windrows of a World Heritage Site: The Paranaguá Estuarine Complex, Brazil
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Surface water sampling across the Paranaguá Estuarine Complex, a UNESCO World Heritage Site in Brazil, detected microplastics throughout the system, with estuarine litter windrows acting as accumulation hotspots at nearly ten times the average estuarine concentration. The presence of microplastics at a protected World Heritage site demonstrates that plastic pollution respects no conservation boundaries, and that windrow dynamics are a key driver of MP hotspot formation in transitional coastal ecosystems.
Seasonal Variations in Microplastic Pollution in Beach Sediments along the Eastern Coast of Rio de Janeiro State, Brazil
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A survey of 27 beaches along Rio de Janeiro's eastern coast found microplastics on every beach, with winter counts (2,987 particles) nearly five times higher than summer (562 particles), driven by seasonal wind and wave dynamics, with fragments and fibers of polyethylene and polypropylene dominating. The seasonal variation reveals that MP exposure for coastal wildlife and beachgoers fluctuates dramatically with environmental conditions, complicating risk assessments tied to any single sampling window.
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