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Marine plastic pollution and ecological disturbance across coastal ecosystems of the Ningbo, China
Summary
Researchers studied plastic pollution across coastal habitats near Ningbo, China—one of the world's busiest shipping ports—and found that areas with heavy plastic contamination, like harbor channels and mangroves, lost nearly half their wildlife diversity compared to cleaner sites. The plastic debris (mostly packaging and fishing gear) also acted like a sponge, soaking up toxic chemicals and heavy metals, which matters because these same coastal waters supply seafood that people eat, potentially passing pollutants up the food chain. This research helps pinpoint pollution hotspots so cleanup effor
Marine plastic pollution poses a mounting threat to coastal biodiversity and ecosystem functioning globally. The coastal waters of Ningbo, China represent a particularly significant case given the city's dual identity as one of the busiest container ports in the world and a region containing diverse near shore habitats including mangrove fringes, estuarine mudflats, sandy beaches, rocky intertidal zones, sea grass meadows, and sub tidal kelp beds. This study presents the first integrated multi-ecosystem assessment of plastic debris burden and associated ecological disturbance across eight designated sampling sites within the Ningbo coastal corridor. Field surveys were conducted between March 2022 and November 2023 using standardised belt transect sampling, sediment core extraction, and water column trawling. A total of 14,376 plastic items were recorded and characterized by polymer type via Fourier-transform infrared spectroscopy (FTIR). Biotic surveys enumerated species richness, Shannon diversity, and functional group composition across each ecosystem. Chemical sorption analyses quantified the concentrations of priority pollutants including polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), bisphenol a, phthalates, and trace metals sorbed onto recovered plastic fragments. Results indicate that the harbor channel and mangrove fringe sites recorded the highest plastic contamination indices (1.00 and 0.91, respectively), while species richness and community resilience declined by 42.7% and 51.9% between reference and high-exposure conditions. Polyethylene dominated the debris profile (34.2%), with packaging waste and discarded fishing gear collectively constituting the primary input pathways. Municipal solid waste accounted for the largest source fraction at 38.4% of the estimated annual load of 4802 t. The study identifies critical spatial hotspots and source categories and evaluates the effectiveness of eight distinct management interventions using a cost-reduction framework. Findings provide an evidence base for targeted remediation and support the design of integrated coastal management strategies aligned with China's Marine Environmental Protection Law and the draft Global Plastics Treaty.