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Microplastics in Caves: A New Threat in the Most Famous Geo-Heritage in the World. Analysis and Comparison of Italian Show Caves Deposits
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Microplastics in caves: A new threat in the most famous geo-heritage in the world. Analysis and comparison of Italian show caves deposits
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Italian show caves were found to contain microplastics throughout their sediments, with tourist areas having higher concentrations (average 4300 items/kg) than non-tourist areas (2570 items/kg), dominated by sub-millimeter polyester and polyolefin fibres.
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Researchers sampled water and flood sediments in a Missouri limestone cave and found microplastics in all 34 samples, with sediment concentrations roughly 100 times higher than water, indicating that cave sediments act as significant microplastic sinks. Contamination decreased with depth into the cave, pointing to human activity near the entrance as the primary source of pollution entering the karst system.
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Researchers characterized microplastic pollution inside Mammoth Cave National Park, finding that visitor clothing lint and other anthropogenic inputs contaminate even protected cave environments. The findings illustrate that microplastics penetrate remote and enclosed ecosystems far from urban centers, challenging the notion that protected areas can serve as microplastic-free reference environments.
Characterizing Microplastic Pollution in Mammoth Cave National Park
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An initial survey of Mammoth Cave National Park—the world's longest cave system and a UNESCO World Heritage Site—found microplastics in cave stream water and sediments, including in areas distant from tourist activity. The detection of microplastics in this protected karst environment highlights the vulnerability of cave ecosystems to surface contamination and the capacity of groundwater systems to transport plastic particles deep underground.
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