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Sub-lethal effects of nanoplastics upon chronic exposure to Daphnia magna
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Researchers exposed Daphnia magna to nanoplastics for 21 days and found that 20 nm particles at 50 mg/L caused significant sublethal effects including reduced reproduction and altered growth, while 200 nm particles at the same mass concentration had less impact.
Studies of microplastic and nanoplastic toxicity on aquatic invertebrates predominantly focus on short-term effects such as mortality and immobility. This study investigated sublethal effects on Daphnia magna when exposed to dialyzed 20 nm and 200 nm carboxylated polystyrene nanoplastics for 21 days. The study tested the effects of 50 mg/L of both particle sizes and 0.1 mg/L of the 20 nm particles. Data results between the 50 mg/L for both particle sizes, which maintains the particle mass concentration constant, and between the 50 mg/L 200 nm and 0.1 mg/L 20 nm treatments, which maintains particle number concentration constant, allowed comparison of dose metrics. Exposures of Daphnia magna to 0.1 mg/L and 50 mg/L of 20 nm particles enabled the evaluation of the effects of particle mass concentration on the toxicity of the smaller particles. Chronic exposure to polystyrene nanoplastics impacted growth, molting and reproduction of Daphnia magna at both tested sizes, and at particle concentrations as low as 0.1 mg/L. Overall, the results of this study showed similar trends in several measured endpoints whether using the mass concentration or particle counts as dose metrics and change in particle concentration did not result in a significant difference in the observed endpoints for 20 nm particles.
More Papers Like This
Sub-lethal effects of nanoplastics upon chronic exposure to daphnia magna
AI summary Read the abstract
Researchers conducted 21-day chronic exposures of Daphnia magna to 20 nm and 200 nm carboxylated polystyrene nanoplastics at 50 mg/L and 0.1 mg/L, finding sub-lethal effects on growth, molting, and reproduction at all tested concentrations and both size classes, with results supporting particle number as a relevant dose metric.
Evaluating sublethal effects of long-term exposure of Daphnia magna to nanoplastics at a low concentration
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Lab experiments exposed Daphnia magna — a water flea that links primary producers to larger predators — to nanoplastics at low concentrations over multiple generations. The nanoplastics caused sublethal reproductive effects that became more pronounced over successive generations, suggesting that long-term, low-level nanoplastic exposure in the environment could gradually impair aquatic invertebrate population health.
Sublethal impacts of fragmented polyethylene nanoplastics on Daphnia magna following chronic exposure
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Researchers exposed Daphnia magna (water fleas) to fragmented polyethylene nanoplastics over a chronic period and observed adverse sublethal effects. The study suggests that even at concentrations that do not cause outright mortality, fragmented nanoplastics from real-world polyethylene degradation can impair the health and function of these important freshwater organisms.
Long-term exposure to nanoplastics reduces life-time in Daphnia magna
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Researchers conducted long-term exposure experiments to assess the effects of nanoplastics on the freshwater invertebrate Daphnia magna over its entire lifetime. The study found that chronic nanoplastic exposure significantly reduced the lifespan of these organisms, demonstrating that while short-term acute toxicity has been documented, the long-term consequences of nanoplastic pollution may be even more concerning for aquatic ecosystems.
Primary and Secondary Plastic Particles Exhibit Limited Acute Toxicity but Chronic Effects on Daphnia magna
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Researchers investigated the chronic effects of both primary nanoplastics (polystyrene nanospheres) and secondary micro- and nanoplastics from weathered single-use plastics on Daphnia magna across multiple generations. The study found that nanoplastics accumulated in the intestine and brood chamber, transferred to offspring, and reduced reproduction and physiological function, with effects persisting across generations even after exposure ended.
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