Assessing the Differential Toxicity of Polystyrene Microplastic Particles and Comparing the Impacts of Bead-Shaped Versus Fragmented Particles on Daphnia Magna

Adverse Effects of Polystyrene Microplastic Exposure on Daphnia magna: a Comprehensive Assessment of Acute Toxicity, Behavioral Changes, and Oxidative Stress

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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.

Microplastic Transformation and Toxicity Effects on Daphnia magna

Chronic and Acute Water-Soluble Microplastics Uptake and Effects on Growth and Reproduction of Daphnia magna

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Researchers found that two water-soluble microplastics — polyvinyl alcohol and polymethacrylic acid — harm the water flea Daphnia magna, reducing lifespan, reproduction, and causing physical deformities, raising concerns about these less-studied plastic types that dissolve in water rather than forming visible particles.

Toxicity Effects of Microplastics and Tire Particles on Daphnia magna

Are Daphnia similis Playing a Significant Role in Microplastic Biofragmentation?

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Researchers exposing the freshwater microcrustacean Daphnia similis to polystyrene microspheres found that the organisms reduced particle size by nearly 33% over six days through biofragmentation, demonstrating that zooplankton ingestion is an underappreciated pathway for breaking down microplastics into smaller particles.