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Metabolomic Responses in Freshwater Benthic Invertebrates, Chironomus Tepperi, Exposed to Polyethylene Microplastics: A Two-Generational Investigation
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Metabolomic responses in freshwater benthic invertebrate, Chironomus tepperi, exposed to polyethylene microplastics: A two-generational investigation
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Researchers examined metabolomic changes in the freshwater midge Chironomus tepperi exposed to polyethylene microplastics across two generations, finding that environmentally relevant concentrations altered metabolite profiles and negatively affected survival and emergence.
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Researchers exposed Chironomus riparius larvae to polyethylene microplastics and used transcriptomics and metabolomics to characterize suborganismal responses, finding disruption of oxidative stress pathways, energy metabolism, and cuticle synthesis — effects not captured by standard life-history endpoints alone.
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"This ecotoxicological review examined how microplastics accumulate in aquatic organisms across multiple trophic levels, documenting impacts on physiology, reproduction, and behavior, as well as the transport of associated chemical contaminants through food webs. Because humans sit at the top of aquatic food chains, the bioaccumulation dynamics described here translate directly into dietary microplastic exposure, making ecotoxicological endpoints in fish and shellfish key indicators of human health risk."
Multigenerational effects of polyethylene microplastics on freshwater benthic invertebrates, Chironomus tepperi
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Researchers exposed the freshwater benthic midge Chironomus tepperi to polyethylene microplastics (8-20 µm) in sediment at four environmentally relevant concentrations over two generations, finding no significant effects on growth but significant decreases in survival and emergence rates at the highest concentration (1,000 MPs/kg) in both generations. Metabolic analyses were conducted to further characterize sublethal mechanisms of MP toxicity in this common stormwater sediment organism.
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