Oxidative stress status and antioxidative responses in neonate versus adult Daphnia magna exposed to polystyrene leachate
Bibliographic record
Abstract
Abstract Objective Plastic pollution, particularly polystyrene, significantly threatens aquatic ecosystems worldwide. Furthermore, plastic leachates have been documented to be detrimental to some aquatic organisms; however, understanding the toxicity mechanism remains limited. This study aimed to investigate the ecotoxicological effects of polystyrene leachate on neonate and adult Daphnia magna , a keystone species in freshwater ecosystems. Methods The effects of the leachate were studied by employing the novel technique of separating daphnids from the polystyrene microplastic fragments via dialysis tubing, which was prepared 24 and 72 h before organism exposure. Acute toxicity was assessed as effects on organism mobility, oxidative stress (reactive oxygen species), antioxidative enzyme responses (superoxide dismutase and catalase), as well as the effects on the biotransformation enzyme glutathione S-transferase’s activity. Results Under the experimental conditions, the mobility and oxidative status of the daphnids were unaffected, irrespective of the organisms’ age or leaching time. In adults exposed for 24 h, the antioxidant defense enzyme activities were elevated, contributing to cellular homeostasis maintenance. However, the catalase activity was reduced for neonates and adults exposed to the prolonged pre-leached treatment, thus making them less capable of retaining homeostasis when exposed to toxicant mixtures. Conclusion This study highlights the vulnerability of D. magna to polystyrene leachate and underscores the need for continued research on the ecotoxicological effects of plastic pollution in aquatic ecosystems. Findings from this investigation contribute to understanding the ecological consequences of plastic pollution, which can inform mitigation strategies and policy decisions to preserve the health and integrity of freshwater ecosystems.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".