We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Adverse Effects of Polystyrene Microplastic Exposure on Daphnia magna: a Comprehensive Assessment of Acute Toxicity, Behavioral Changes, and Oxidative Stress
AI summary Read the abstract
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.
Microplastics (MPs) pollution has emerged as a pressing environmental concern. In this study, we comprehensively evaluated the adverse effects of polystyrene microplastic (PSMP) on Daphnia magna, focusing on acute toxicity, behavioral changes, and oxidative stress responses. Exposure experiments demonstrated that the acute toxicity of PSMP (1, 6.5, and 50 µm in size) to D. magna increased with concentration, with 1-µm particles being the most toxic (48-h LC50 value: 23.57 mg/L). Behavioral analyses revealed that PSMP exposure reduced swimming speed from 5.8 ± 0.2 mm/s (control) to 3.7 ± 0.4 mm/s (1/2 LC50) after 24 h, further decreasing to 3.0 ± 0.5 mm/s at 48 h. Similarly, thoracic limb movement frequency, jumping frequency, and mandibular activity were suppressed, with transient hyperactivity observed at low doses (1/16 LC50) followed by inhibition. Furthermore, exposure to smaller-sized PSMP caused significant changes in the levels of superoxide dismutase, catalase, malondialdehyde, and glutathione in D. magna, indicating that PSMP induces oxidative stress by increasing reactive oxygen species levels, ultimately leading to oxidative damage. While particle size is a well-established critical parameter, behavioral endpoints (e.g., reduced swimming speed and feeding efficiency) and oxidative damage at sublethal concentrations serve as more sensitive early-warning biomarkers for environmental risk assessment. Future research should validate these biomarkers in natural ecosystems and investigate the effects of chronic exposure on population dynamics.
More Papers Like This
Chronic and Acute Water-Soluble Microplastics Uptake and Effects on Growth and Reproduction of Daphnia magna
AI summary Read the abstract
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.
Antibiotic and microplastic co-exposure: Effects on Daphnia magna and implications for ecological risk assessment
AI summary Read the abstract
This review pulls together existing research on how antibiotics and microplastics, both common pollutants in lakes and rivers, affect tiny water creatures called Daphnia, which are important indicators of freshwater ecosystem health. The key takeaway: when these two pollutants combine, they appear to cause more harm together than either does alone, suggesting our current safety assessments (which typically test pollutants one at a time) may be underestimating real-world risks. While this study focused on aquatic life rather than humans directly, it matters because these same waterways often feed into our drinking water and food supply, so better understanding combined pollutant effects could help protect
The Impact of Polystyrene Microplastics in Living Organisms; Environmental and Ecological Concerns
AI summary Read the abstract
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.
Polystyrene microplastics: environmental presence, pathways, and biological impact
AI summary Read the abstract
Researchers reviewed the environmental presence, transport pathways, and biological impacts of polystyrene microplastics, documenting how widespread food packaging use leads to pervasive contamination of aquatic and terrestrial ecosystems and raises concerns for organismal and human health.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.