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Microplastic pollution of the Uglich Reservoir: its content and distribution in abiotic components of the aquatic ecosystem
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Scientists found tiny plastic particles (mostly fibers) throughout both the water and the muddy bottom of Russia's Uglich Reservoir, a body of water connected to a river system many people rely on. This matters because microplastics in drinking water sources can eventually make their way into fish, and potentially into our own bodies, though this particular study didn't test for direct health effects—it simply confirmed that plastic pollution has already spread widely into places we might not expect.
This study analyzes the pollution of the surface water layer and bottom sediments (BS) of the Uglich Reservoir by microplastics (MP). For the first time, an assessment of the content of plastic particles in the BS of this water body has been conducted. The dynamics of MP concentrations were studied, and their morphometric (size, shape) and colorimetric (color) parameters were characterized in detail. The results obtained in 2024 demonstrated the ubiquitous presence of MP particles in the studied aquatic area. The average concentration in the water column was 43.1 ± 4.8 items/m³, while in the BS this figure reached 38.2 ± 3.8 items/kg. Morphological analysis revealed a predominance of fibers in the abiotic components of the ecosystem, whereas fragments were encountered less frequently, and films were found rarely. The color spectrum of the identified MP displayed significant diversity, encompassing 10 color categories. Particles of grey, blue, and red hues were the most observed.
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Researchers examined microplastic contamination in fish from the Neva River and Lake Ladoga in Russia, situating the findings within the global context of widespread plastic pollution in aquatic ecosystems. The study highlighted the difficulty of natural plastic decomposition and the ongoing accumulation of microplastics in freshwater systems, with UNESCO estimates of 8-10 million tonnes entering seas annually.
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