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From water to sediment: A meta-analysis of microplastic distribution and the impact of dams in reservoir ecosystems
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This meta-analysis of 36 reservoirs worldwide found that microplastics tend to accumulate near dams due to a trapping effect, with concentrations declining upstream. Vertical stratification patterns and significant impacts on benthic organism growth and reproduction were observed, highlighting reservoirs as underrecognized microplastic accumulation hotspots in freshwater systems.
Microplastics (MPs) have become major contaminants in freshwater ecosystems. While numerous studies have characterized MPs in reservoirs, a comprehensive synthesis focusing on in-reservoir variations and dam-related influences is still lacking. This study investigates the spatial distribution of MPs in reservoir water and sediment based on data synthesized from 34 peer-reviewed studies covering 36 reservoirs across diverse climatic and hydrological regions worldwide, with a focus on the trapping effects of dams. Using a combination of generalized linear mixed models (GLMM) and generalized additive mixed models (GAMM), the study analyzed MP abundance patterns in relation to distance to the dam and identified key environmental and anthropogenic factors influencing their distribution. The results show that MPs tend to accumulate near dams, suggesting a trapping effect, while upstream MP concentrations decline with increasing distance. Vertical stratification patterns were observed in both water and sediment, indicating different transport mechanisms. Additionally, exposure to MPs significantly affected benthic organisms, particularly in terms of growth and reproduction, with effects intensifying over longer exposure durations. These findings highlight the need for improved monitoring and management strategies in reservoirs to mitigate MP pollution and its ecological consequences.
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Damming has changed the migration process of microplastics and increased the pollution risk in the reservoirs in the Shaying River Basin
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Researchers investigated how dam construction in the Shaying River Basin affects microplastic pollution in water, sediment, and biological tissues near ten dams. The study found that dams alter the transport and deposition of microplastics, intercepting large amounts in reservoirs and changing how microplastics accumulate in freshwater organisms through shifts in food web structure.
Dam operation changed the transport patterns of microplastics - from a global perspective
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Researchers analyzed data from 517 sampling sites near dams worldwide to understand how dam operations affect microplastic transport in rivers. They found that reservoirs behind dams accumulate higher abundances and more diverse types of microplastics compared to upstream and downstream areas, essentially acting as traps. Seasonal dam operations, particularly during wet seasons, can flush accumulated microplastics downstream into sediments, altering pollution distribution patterns.
A review of microplastics pollution in dams globally: Consequences and future outlook
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This review examines microplastic contamination in dams worldwide, covering particle origins, dominant shapes and polymer types, and the ecological and water quality consequences. It identifies dams as significant MPs sinks and highlights major knowledge gaps given the limited research on this environment.
The role of dams as sources and sinks of plastics in global rivers
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This meta-analysis pools data from global studies to assess how dams trap and release plastic pollution in rivers. The findings reveal that while dams can act as sinks that accumulate plastic debris, they also release microplastics downstream during water discharge, affecting the quality of water that communities downstream rely on for drinking and agriculture.
The effect of dams on river transport of microplastic pollution
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This study investigated whether dams trap microplastics in river sediments, finding significant accumulation of microplastics upstream of dams compared to downstream, suggesting dams act as microplastic sinks. The findings have implications for managing microplastic transport through river systems and for understanding contamination risks associated with dam removal.
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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.