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Distribution characteristics and transport pathways of soil microplastics in coral reef islands with different developmental stages and human activities
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Researchers mapped microplastic contamination in the soil of coral reef islands in the South China Sea and found 1,068 to 1,616 particles per kilogram across islands at different stages of development. More developed islands with greater human activity had higher contamination levels, and ocean currents and monsoons were the main forces spreading microplastics to less developed islands. The study shows that even remote island ecosystems are not safe from microplastic pollution, which can affect the soil and water these communities depend on.
Microplastics have attracted substantial attention on remote coral sand islands owing to their delicate ecosystems. However, the distribution, transport pathways, and control mechanisms of soil microplastics on these islands are yet to be elucidated. The coral reef islands of China's Xisha Archipelago in the South China Sea are at varying stages of development and experience differing levels of human activity, rendering them an ideal location to investigate the environmental characteristics of microplastics. This study conducted a comparative analysis of the distribution characteristics of microplastics in surface soils and beach sands, which were collected from coral cays and islands. We further analyzed the potential impacts of plant cover, geomorphology, soil environmental factors and human activities on accumulation and transport of microplastics. The results show that their abundance varies from 1068 to 1616 particles/kg on the different reef islands. Total organic carbon and dissolved organic carbon in the soils exert a significant influence on the accumulation of microplastics. The abundance of microplastics in the exposed areas showed an increasing trend with the degree of island development, and the human activities have a significant impact on the distribution of microplastics across the islands. Analysis of the microplastic abundance at different locations of the atoll reveals that ocean currents and monsoons are the primary drivers of microplastic accumulation on the coral reef islands. This study provides a scientific basis for the management of microplastic pollution and environmental conservation on remote islands.
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The spatial distribution of microplastic in the sands of a coral reef island in the South China Sea: Comparisons of the fringing reef and atoll
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Microplastic abundance in coral reef island sands of the South China Sea was measured at fringing reef sites (90–530 items/kg) and atoll sites (60–610 items/kg), with the lower-human-activity Xisha Islands atoll showing higher concentrations attributed to oceanic current accumulation. The study reveals that even remote coral reef ecosystems are contaminated with microplastics and that oceanographic factors can outweigh local human activity.
Microplastics in remote coral reef environments of the Xisha Islands in the South China Sea: Source, accumulation and potential risk
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Scientists mapped microplastic contamination across 13 islands in the remote Xisha Islands of the South China Sea and found an average of 682 particles per kilogram of sediment. The study identified local sewage, fishing waste, and industrial runoff from nearby countries as the main sources. This shows that even remote coral reef ecosystems far from population centers are not safe from microplastic pollution.
Spatial distribution of microplastics around an inhabited coral island in the Maldives, Indian Ocean
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Researchers investigated microplastic accumulation across fore reef, reef flat, and beach sediment environments surrounding a small inhabited coral island in the Maldives, finding 1,244 individual microplastic pieces across 22 sampling sites. The study reveals that even remote inhabited islands in the Indian Ocean show significant microplastic contamination, with spatial distribution patterns reflecting local hydrodynamics and human activities.
Human activity shapes the distribution and characteristics of microplastics in surface soils on three tropical islands in China
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Scientists studying soil on three tropical Chinese islands found that the more people live and work in an area, the more tiny plastic particles (microplastics) build up in the ground—islands with dense housing had over three times more plastic bits than untouched areas. Even islands with almost no residents weren't spared, since ocean currents carried plastic debris onto their shores. This matters because these plastics can enter the food chain through soil, plants, and animals, meaning our everyday waste and habits directly shape environmental plastic pollution, even in remote places we might assume are pristine.
Microplastic Pollution and Its Ecological Risks in the Xisha Islands, South China Sea
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Researchers assessed microplastic pollution across sediments, soil, water, fish, and seabirds at the Xisha Islands in the South China Sea, finding contamination in all environmental media. Soil samples showed the highest concentrations at nearly 93 items per kilogram, while the overall pollution load was classified as slightly polluted with a high polymer hazard index. The study provides a comprehensive baseline for understanding microplastic ecological risks in this remote island chain.
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