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Multidimensional Assessment of Microplastic Pollution in Mangrove Wetlands: Driving Mechanisms, Carbon Contribution, and Ecological Risk
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Scientists found tiny plastic particles called microplastics throughout mangrove wetlands in China, with the highest levels in areas used for fishing and fish farming. These plastic particles are building up in the sediment and water, creating pollution hotspots that pose moderate ecological risks to these important coastal ecosystems. This matters because mangroves help protect coastlines and support marine life that humans depend on for food, so plastic pollution in these areas could ultimately affect our food supply and coastal protection.
Microplastics (MPs) have emerged as pervasive contaminants in mangrove ecosystems, yet their driving factors, carbon contributions, and ecological risks remain poorly understood. This study systematically investigated MP pollution across six functional areas in two representative mangroves of Hainan, China. MPs were ubiquitous in both water and sediments, with higher abundances in fishing and aquaculture zones than in tourist protection and residential zones. Sediments in the low-tide zone acted as major MP sinks compared to those in the high-tide zone. PP was the main polymer type, and fibers dominated in water and fragments in sediments. The studied mangroves exhibited a moderate level of MP pollution on a global scale. Partial least-squares path modeling (PLS-PM) identified vegetation density, nutrient enrichment, and heavy metals as key drivers. However, its effects vary between sediment and water environments. Integrated ecological risk indices indicated generally low-to-middle risk with localized pollution hotspots in estuarine and aquaculture areas. MP mass concentrations averaged 5.69 mg/m3 in water and 4.73 mg/kg dw in sediments, contributing 0.0050-0.0147% to sedimentary organic carbon as an emerging inert carbon pool. In addition, it is estimated that the study area receives an additional annual MP load of 3457.08 kg and an MP carbon load of 2795.83 kg. These findings provide a comprehensive understanding of MP behavior and environmental effects in mangrove wetlands, offering a scientific foundation for targeted mitigation and long-term monitoring of coastal plastic pollution.
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A survey of mangrove sediments along China's coast found microplastics were ubiquitous, with concentrations and polymer types varying by proximity to human activity and hydrological conditions. The study shows that mangrove forests, which provide critical coastal ecosystem services, are accumulating significant quantities of plastic pollution.
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Microplastics were found to be widespread in mangrove sediments across Southern China, with higher concentrations in areas closer to urban development and aquaculture. The study highlights mangroves as accumulation zones for microplastic pollution, which could threaten these ecologically important coastal ecosystems.
Microplastics in Different Coastal Environmental Matrices and Potential Ecological Risks
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Scientists found tiny plastic particles (mostly fibers from things like clothing and fishing gear) scattered across coastal areas, with mangrove forests trapping the most—likely because their roots act like a net. Since these coastal zones connect to the seafood we eat and the water systems we rely on, understanding where microplastics build up helps researchers pinpoint pollution sources and predict where contamination risks are highest for both marine life and the food chain that eventually reaches our plates.
Distribution, characteristics, and human exposure to microplastics in mangroves within the Guangdong-Hong Kong-Macao Greater Bay Area
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Researchers mapped microplastic distribution across three mangroves in the Greater Bay Area of southern China, finding concentrations up to 1,600 particles per kilogram with higher levels at forest fringes, and assessed potential human exposure pathways.
Fate and Effects of Macro- and Microplastics in Coastal Wetlands
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Researchers compiled data from 112 studies to evaluate how macro- and microplastics accumulate in and affect coastal wetlands including mangroves, salt marshes, and seagrass beds. They found that plastic concentrations in wetland sediments and marine animals were roughly 200 times higher than in the water column, indicating these ecosystems act as major plastic sinks. The study warns that plastic accumulation can alter sediment properties, harm wildlife, and disrupt the carbon storage function of these critical habitats.
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