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Shape-Driven Toxicity of Polystyrene Microplastics: Impacts on Physiology and Gut Microbiota in Daphnia magna
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Comprehensive toxicity testing of polystyrene microplastics on Daphnia magna showed that 1-µm particles were most toxic (48-h LC50: 23.57 mg/L), reducing swimming speed and feeding behavior while triggering oxidative stress markers including elevated malondialdehyde. These behavioral and biochemical endpoints serve as sensitive early-warning biomarkers for ecological risk, highlighting how nanoscale plastics impair the zooplankton that form the base of aquatic food webs.
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This review comprehensively examined the environmental and ecological impacts of polystyrene microplastics, which readily adsorb both organic and inorganic pollutants and carry them into living organisms. Polystyrene is one of the most widely produced plastics globally, and its breakdown into microplastics creates particles that act as vectors for toxic chemicals in ecosystems and potentially in human bodies.
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