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Factors influencing the distribution, risk, and transport of microplastics and heavy metals for wildlife and habitats in “island” landscapes: From source to sink
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Researchers studied microplastic and heavy metal pollution in the Helan Mountain ecosystem, finding contamination in both soil and wild blue sheep feces that was linked to tourism and transportation activity. A new risk model revealed that some areas face high ecological and health risks from the combined presence of these pollutants. The study shows how microplastics and heavy metals travel together through remote landscapes, creating pollution cycles that threaten wildlife and the ecosystems they inhabit.
Microplastics (MPs) and heavy metals (HMs) are important pollutants in terrestrial ecosystems. In particular, the "island" landscape's weak resistance makes it vulnerable to pollution. However, there is a lack of research on MPs and HMs in island landscapes. Therefore, we used Helan Mountain as the research area. Assess the concentrations, spatial distribution, ecological risks, sources, and transport of MPs and HMs in the soil and blue sheep (Pseudois nayaur) feces. Variations in geographical distribution showed a connection between human activity and pollutants. Risk assessment indicated soil and wildlife were influenced by long-term pollutant polarization and multi-element inclusion (Igeo, Class I; PHI, Class V; RI (MPs), 33 % Class II, and 17 % Class IV; HI = 452.08). Source apportionment showed that tourism and coal combustion were the primary sources of pollutants. Meanwhile, a new coupling model of PMF/Risk was applied to quantify the source contribution of various risk types indicated transportation roads and tourism sources were the main sources of ecological and health risks, respectively. Improve the traceability of pollution source risks. Furthermore, also developed a novel tracing model for pollutant transportation, revealing a unique "source-sink-source" cycle in pollutant transportation, which provides a new methodological framework for the division of pollution risk areas in nature reserves and the evaluation of spatial transport between sources and sinks. Overall, this study establishes a foundational framework for conducting comprehensive risk assessments and formulating strategies for pollution control and management.
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Researchers analyzed microplastic contamination in a remote region of the Tibetan Plateau and found plastic particles in surface water, sediment, and soil even in this sparsely populated area. Tourism was identified as the primary source of water contamination, while agriculture and historical industrial activity contributed to soil pollution. The study demonstrates that microplastic pollution from human activities extends even to some of the most remote environments on Earth.
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Researchers documented microplastic contamination in the headwaters of the Yellow River on the Tibetan Plateau, a remote area often considered pristine. They found polypropylene and polyester particles to be the most common types, with sources linked to both local human activities and atmospheric transport. The study suggests that even remote high-altitude ecosystems are not immune to microplastic pollution and face associated ecological risks.
Microplastics in the Himalayan environment: a review of sources, atmospheric inputs, and subsurface pathways
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This review synthesizes current knowledge on microplastic contamination in the Himalayan environment, examining sources including tourism and agriculture, atmospheric transport pathways, and subsurface migration routes that explain how MPs reach these remote high-altitude ecosystems.
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Researchers analyzed microplastic accumulation in pristine and remote soils in Iceland to test whether long-range atmospheric transport deposits microplastics in undisturbed environments. Microplastics were detected in Icelandic soils, confirming that atmospheric deposition reaches isolated environments far from plastic sources.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.