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Microplastic-mediated transport of PCBs? A depuration study with Daphnia magna
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Researchers tested whether microplastics could help remove PCBs from the water flea Daphnia magna, finding that only one PCB congener was cleared more efficiently with microplastic exposure while most others were unaffected. The study suggests microplastics have limited value as a depuration tool for PCB-contaminated zooplankton under environmentally relevant conditions.
The role of microplastic (MP) as a carrier of persistent organic pollutants (POPs) to aquatic organisms has been a topic of debate. However, the reverse POP transport can occur if relative contaminant concentrations are higher in the organism than in the microplastic. We evaluated the effect of microplastic on the PCB removal in planktonic animals by exposing the cladoceran Daphnia magna with a high body burden of polychlorinated biphenyls (PCB 18, As the endpoints, we used PCB body burden, growth, fecundity and elemental composition (%C and %N) of the daphnids. In the daphnids fed with microplastic, PCB 209 was removed more efficiently, while there was no difference for any other congeners and PCBs between the microplastic-exposed and control animals. Also, higher sizespecific egg production in the animals carrying PCB and receiving food mixed with microplastics was observed. However, the effects of the microplastic exposure on fecundity were of low biological significance, because the PCB body burden and the microplastic exposure concentrations were greatly exceeding environmentally relevant concentrations.
More Papers Like This
Microplastic-mediated transport of PCBs? A depuration study with Daphnia magna
AI summary Read the abstract
This study used the water flea Daphnia magna to investigate whether microplastics can affect how persistent organic pollutants like PCBs are eliminated from aquatic organisms. The experiment found that microplastics could act as a vehicle for contaminant transport, supporting the concern that they change how organisms are exposed to legacy pollutants.
The effect of microplastics on the depuration of hydrophobic organic contaminants in Daphnia magna: A quantitative model analysis
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Researchers developed a biodynamic model to predict how microplastic ingestion affects the elimination of hydrophobic organic contaminants in water fleas (Daphnia magna), finding that microplastics actually promote the depuration of PCBs by creating a fugacity gradient — contributing 29–41% of total contaminant elimination, with smaller particles having a stronger effect.
Accumulation, depuration, and potential effects of environmentally representative microplastics towards Daphnia magna
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Researchers created environmentally realistic microplastics by grinding common consumer products and tested their effects on Daphnia magna, a small freshwater organism widely used in toxicity studies. The organisms accumulated the microplastics and showed some ability to clear them over time, but the realistic microplastics caused different effects than the pristine laboratory plastics typically used in research. This suggests that many existing studies may underestimate the true environmental risk of microplastics.
Effect of Microplastic Amendment to Food on Diet Assimilation Efficiencies of PCBs by Fish
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Goldfish fed food mixed with PCB-contaminated microplastics absorbed only slightly more PCBs than fish fed just PCB-contaminated food without microplastics. This suggests that microplastics may not significantly increase the amount of PCBs that fish absorb from their diet, though they do act as carriers.
Rethinking the relevance of microplastics as vector for anthropogenic contaminants: Adsorption of toxicants to microplastics during exposure in a highly polluted stream - Analytical quantification and assessment of toxic effects in zebrafish (Danio rerio)
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Researchers exposed microplastics in a highly polluted stream to assess their role as contaminant vectors, then tested effects on zebrafish, finding that naturally contaminated microplastics had limited additional toxicity compared to the polluted water itself.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.