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Beneath the surface: Decoding the impact of Chironomus riparius bioturbation on microplastic dispersion in sedimentary matrix
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Researchers investigated how the burrowing activity of midge larvae affects the movement of microplastics through lake and river sediments. They found that the larvae's bioturbation activity pushed microplastic particles deeper into the sediment, and the presence of microplastics in turn influenced the intensity of the larvae's burrowing behavior. The study highlights how bottom-dwelling organisms can act as unintentional transporters of microplastic pollution within freshwater ecosystems.
A detailed understanding of microplastics (MPs) behaviour in freshwater ecosystems is crucial for a proper ecological assessment. This includes the identification of significant transport pathways and net accumulation zones, considering their inherent, and already proven influence on aquatic ecosystems. Bioavailability of toxic agents is significantly influenced by macroinvertebrates' behaviour, such as bioturbation and burrowing, and their prior exposure history. This study investigates the effect of bioturbation activity of Chironomus riparius Meigen, 1804 on the vertical transfer of polyethylene MPs ex-situ. The experimental setup exposes larvae to a scenario of 10× the environmentally relevant high concentration of MPs (80 g m). Bioturbation activity was estimated using sediment profile imaging with luminophore tracers. This study demonstrated that spherical MPs are vertically transferred in the sediment due to the bioturbation activity of C. riparius larvae and that their presence influences the intensity of the bioturbation activity over time. The present findings provide a noteworthy contribution to the understanding of the relationship between ecosystem engineers and the dispersion and accumulation of MPs within freshwater ecosystems.
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Downsizing plastics, upsizing impact: How microplastic particle size affects Chironomus riparius bioturbation activity
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This study tested how different sizes of polyethylene microplastics affect the burrowing behavior of freshwater midge larvae, which play an important role in mixing and aerating lake and river sediments. Smaller microplastics were ingested more readily and disrupted the larvae's sediment-mixing activity more than larger particles. Since these organisms are critical for healthy freshwater ecosystems, the findings suggest that small microplastics could disrupt nutrient cycling in lakes and rivers.
New insights into changes in phosphorus profile at sediment-water interface by microplastics: Role of benthic bioturbation
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The study examined how different types of microplastics affect phosphorus cycling at the sediment-water interface through their impacts on burrowing chironomid larvae. Researchers found that both bio-based and fossil fuel-based microplastics altered the larvae's biochemical responses and disrupted phosphorus profiles, suggesting microplastics can indirectly affect nutrient dynamics in freshwater ecosystems.
Chironomus riparius Larval Gut Bacteriobiota and Its Potential in Microplastic Degradation
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Researchers characterized the gut bacteria of Chironomus riparius midge larvae and identified strains with plastic-degrading enzyme potential, suggesting that the gut microbiome of sediment-dwelling invertebrates may play a role in breaking down ingested microplastics in freshwater ecosystems.
Microplastics in Freshwater Sediments Impact the Role of a Main Bioturbator in Ecosystem Functioning
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This study investigated how microplastics in freshwater sediments affect Tubifex worms, which are important bioturbators that mix and aerate sediment. Researchers found that microplastic contamination altered the worms' burrowing behavior and disrupted biogeochemical processes at the sediment-water interface. The findings suggest that microplastic pollution could impair fundamental ecosystem functions by affecting the organisms that maintain healthy sediment environments.
The Role of Limnodrilus Cervix in Bioturbation, Organic Matter Dynamics and Microplastic Transport in Freshwater Sediments
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Researchers studied the bioturbation activity of the tubificid worm Limnodrilus cervix in both pond and terrestrial soils, finding that the organism actively transports microplastics vertically within sediment, with the rate and depth of transport varying by substrate type and organic matter content.
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