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What are the toxicological effects of mixing nanoplastics with a nanopesticide on Daphnia magna and Aliivibrio fischeri?
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Scientists tested what happens when tiny plastic particles (nanoplastics) mix with a common pesticide in water using small water creatures as test subjects. They found that the combination was more toxic than either pollutant alone, causing serious harm to reproduction and growth even at very low levels. This matters because these same pollutants are building up in our water systems and food chain, potentially affecting human health through the water we drink and seafood we eat.
Nanotechnology has enhanced the efficiency of pesticides such as nanoatrazine (nATZ), but it also raises concerns regarding potential toxicity to non-target organisms, particularly in aquatic environments already threatened by increasing nanoplastic pollution. This study assessed the individual and combined effects of nATZ and polystyrene nanoplastics (PSNP) on the freshwater microcrustacean Daphnia magna and the marine bacterium Aliivibrio fischeri. Acute tests with D. magna evaluated lethality and interactions in mixture scenarios. Chronic exposure over 21 days examined lethality, reproduction, growth, and swimming behavior. For acute and chronic exposures, reactive oxygen species (ROS) and the activity of antioxidant enzymes, including superoxide dismutase (SOD), glutathione S-transferase (GST), and glutathione peroxidase (GPx), were evaluated. Tests with A. fischeri measured changes in bacterial bioluminescence in response to contamination. Acute toxicity tests with D. magna indicated lowest observed effect concentration (LOEC) values of 4 mg l for nATZ, 130.7 mg l for PSNP, and 1.15 + 65.4 mg l for the mixture, with predominantly synergistic responses under the Abbott reference model. Chronic exposure led to growth inhibition in D. magna at concentrations as low as 0.0228 mg l for nATZ and 0.98 mg l for PSNP, with reproductive effects appearing at even lower concentrations. Both contaminants increased ROS production, and their combination further amplified this response. GST activity increased, whereas SOD and GPx remained at basal levels. For A. fischeri, the toxicity of the nATZ + PSNP mixture (EC= 0.53 + 37.79 mg l) resembled that of PSNP alone (EC= 34.10 mg l), suggesting a dominant PSNP effect. These findings highlight the complexity of interactions between emerging contaminants.
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Scientists tested how tiny plastic particles and a common pesticide affect soil creatures that are important for healthy ecosystems. They found that when these two pollutants are combined, they become more harmful than when alone - even at levels that seemed safe individually. This matters because humans are also exposed to both microplastics and pesticides in our food and environment, suggesting these combinations could pose greater health risks than we previously understood.
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Scientists tested polystyrene nanoplastics and a common insecticide (clothianidin) both alone and together on four different freshwater organisms. Surprisingly, the combined exposure was generally less toxic than predicted, showing antagonistic interactions where the two pollutants partially canceled out each other's effects. However, the nanoplastics alone still caused long-lasting harm to water flea reproduction that carried over to offspring born after exposure ended, suggesting nanoplastics can have multi-generational effects.
Study of the toxicological effects of emerging contaminants on Daphnia similis associating polyethylene microplastics with the agrochemical imidacloprid.
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Brazilian researchers tested the ecotoxicological effects of combining polyethylene microplastics with the insecticide imidacloprid on the freshwater crustacean Daphnia, finding combined exposures were more toxic than either pollutant alone. These results suggest that microplastics and pesticides together pose greater risks to aquatic organisms than studies of single pollutants indicate.
Combined Toxicity of Polystyrene Nanoplastics and Pyriproxyfen to Daphnia magna
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Researchers evaluated the combined toxic effects of polystyrene nanoplastics and the insecticide pyriproxyfen on the water flea Daphnia magna under both acute and chronic exposure conditions. They found that nanoplastics initially reduced the acute toxicity of the pesticide within 24 hours but worsened chronic effects over longer periods. The study suggests that nanoplastics can alter how other environmental contaminants affect aquatic organisms, complicating risk assessments.
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Researchers investigated the combined and individual impacts of microplastics and pesticides on Daphnia magna, a model crustacean widely used in freshwater ecotoxicology, to assess how these co-occurring pollutants affect aquatic ecosystem health. The study examined survival, reproduction, and physiological responses in D. magna exposed to varying concentrations of both stressors under controlled conditions.
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