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Aclaraciones sobre dos articulos anteríores
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Sediments and microplastic samples were collected from the Siberian Crane Reserve at Poyang Lake in China to assess microplastic contamination in a critical wetland habitat. The study provides data on microplastic abundance, morphology, and polymer composition in this ecologically sensitive freshwater ecosystem.
As a new type of pollutant, microplastics have attracted increasing attention. Microplastics in aquatic ecosystems are accumulating at an unprecedented scale, causing significant environmental and economic impacts. In this study, sediments and different types of microplastic samples were collected from the Grus leucogeranus Reserve of Wuxing Reclamation Farm of Poyang Lake, which is the largest freshwater lake in China. The main types of microplastics were film (PE), debris (PP1), fiber (PP2), and foam (PS), and the polymers were identified as polyethylene, polypropylene, and polystyrene in the study area. The structures of microbial communities (fungi and bacteria) were identified using 16S high-throughput sequencing. The results showed that there was no significant difference in the Ace and Chao of bacteria between the surface of PE and PP1 and that of the surrounding sediments (P>0.05), whereas PP2 and PS were significantly lower than those in surrounding sediments (P<0.05). Ace and Chao of fungi showed that PE and PS had no significant differences with the sediment (P>0.05), and PP1 and PP2 were significantly lower than those in surrounding sediments (P<0.05). The species diversity Shannon and Simpson index of bacteria and fungi on different types of microplastic surfaces were lower than that of sediment. The bacterial communities on the sediment and microplastic surface mainly included Proteobacteria and Bacteroidetes. In the fungal community, Basidiomycota, Ascomycota, and Chytridiomycota were the dominant bacteria. Through KEGG functional prediction, it was found that most of the metabolic pathways with a significant difference between bacteria and sediments on the surface of microplastics and with an abundance ratio higher than 1% were related to metabolism. Compared with that of sediment, the metabolic pathways of PE and PP2 on microplastic surfaces were down-regulated mainly in cell motility, signal transduction, and carbohydrate metabolism, whereas the energy metabolism, general and global metabolism pathways, and cofactor metabolism were up-regulated. Compared with that of sediment, the bacterial metabolic pathways of PS and PP1 on microplastic surfaces were down-regulated, mainly including general and global metabolic pathways, translation, and exogenous biodegradation, and cell motility and signal transduction were up-regulated. However, the abundance of other functional genes in sediments and microplastic samples showed little difference. The results indicated that microplastics can change the structure of microbial communities, and the microbial community on the surface of microplastics could catalyze metabolic reactions and promote the decomposition of microplastics. The study of microplastic surface microbial structure in Poyang Lake can support management decisions to protect the ecological integrity of the lake.
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Distribution and characteristics of microplastics in the sediments of Poyang Lake, China
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Researchers found microplastic contamination in sediments across Poyang Lake, China, with abundances ranging from 11 to 3,153 items per kilogram dry weight, and identified significant spatial variability linked to human activity and hydrological conditions.
[Spatiotemporal distribution and multi-source characteristics of microplastics in the soil and water environment of Poyang Lake Wetland, China].
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Researchers investigated spatiotemporal patterns of microplastic contamination in surface water and sediments across Poyang Lake Wetland, China's largest freshwater lake, during both wet and dry seasons. Microplastic abundance in water ranged from 32 to 296 particles per liter and from 460 to 1,369 particles per kilogram in sediment, with levels higher than many comparable freshwater wetlands globally. Beads, fragments, films, and fibers were the dominant forms, with temporal and spatial differences observed across the sampled rivers and confluence zones.
Risk assessment of microplastics in China's largest freshwater lake for Siberian cranes
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Researchers assessed microplastic pollution in Poyang Lake, the world's largest wintering site for Siberian Cranes, and modelled the exposure risk to these endangered birds. Using an exposure risk model and non-carcinogenic risk assessment, they identified MP-contaminated food sources as a meaningful threat to crane populations.
Microplastic abundance, distribution and composition in water, sediments, and wild fish from Poyang Lake, China
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Microplastics were measured in surface water, sediments, and fish (crucian carp) across Poyang Lake, China's largest freshwater lake, finding 5–34 items/L in water, 54–506 items/kg in sediments, and 0–18 items per fish, with heterogeneous spatial distribution related to anthropogenic and topographic factors. The study provides comprehensive multi-compartment baseline data on microplastic contamination in a major Chinese freshwater ecosystem.
Bacterial community structure of water, sediment and microplastics in Poyang Lake wetland.
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This study compared the bacterial communities living on four types of microplastics (film, foam, fiber, and fragment) in Poyang Lake wetland in China against the bacterial communities in the surrounding water and sediment. The microplastic surfaces hosted distinct microbial communities that differed from both the water and sediment, with foam microplastics supporting the least diverse communities. This "plastisphere" research is important because the unique bacteria colonizing plastic surfaces could spread pathogens or alter nutrient cycles in freshwater wetland ecosystems.
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