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Entrapped in debris: a preliminary assessment of the composition of anthropogenic marine debris on selected mangrove habitats of the Jaffna peninsula, Sri Lanka
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Researchers found that mangrove forests in Sri Lanka are getting clogged with trash—mostly plastic (86% of debris found), much of it single-use items that get tangled in the trees' roots. This matters because mangroves are natural nurseries for fish and buffers against coastal erosion, and as plastic waste breaks down there, it can degrade into microplastics that enter the food chain—eventually landing on our plates through seafood. The study is a reminder that better waste management and recycling aren't just about clean beaches; they protect ecosystems that indirectly protect our health.
Anthropogenic marine debris (AMD) is a major global environmental concern. While the consequences on beaches are well-documented internationally, the impact on mangroves has gotten less attention. Although the Jaffna peninsula is home to Sri Lanka's second-largest mangrove forest, the impacts of debris buildup on its mangroves have yet to be properly explored. This research, therefore, aims to analyze the abundance and composition of AMD in selected mangrove habitats of the Jaffna peninsula. Two locations, Mandaithivu and Araly, characterized by extensive Avicennia marina mangrove patches, were chosen. The belt transect technique was applied for sampling, with a 100 m transect established at each location and five quadrats positioned at intervals of 20 m. The classification and identification of sources of AMD were conducted following a combined approach integrating certain previous studies and NOAA guidelines. Dumping was identified as the major source of marine debris at both locations. The average item and weight densities of debris were 0.1 ± 0.05 items/m and 1.74 ± 1.33 g/m, respectively. The findings indicated that plastic debris represented the most common type of AMD at 86%, with single-use plastics being the predominant category. Frequently noted in the study regions were debris entangled within the pneumatophores of mangroves. The establishment of comprehensive laws and regulatory measures, the development of efficient waste management systems, education initiatives targeted at local communities and children, and the promotion of plastic waste recycling are all recommended to prevent additional AMD accumulation in the mangrove ecosystems under study.
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