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Increased food availability reducing the harmful effects of microplastics strongly depends on the size of microplastics
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Researchers found that increased food availability reduced microplastic toxicity in the waterflea Daphnia magna, but this protective effect depended strongly on particle size, with the smallest nanoplastics remaining harmful even when food was plentiful.
Shallow lakes and ponds, providing essential ecological and environmental services, are simultaneously disrupted by various pollutants of emerging concern (PECs). As a group of PECs, microplastics (MPs) ubiquitously found in freshwater are toxic to a huge variety of organisms. However, the consequence of secondary factors such as food quantity determining MPs toxicity, and the corresponding water safety risks await assessment is still poorly understood. Accordingly, we investigated how MPs across three particle sizes (10, 1 and 0.07 µm) interacted with food abundance to affect survival, reproduction and population performance in the waterflea Daphnia magna. Across multiple population traits, we found that MPs toxicity on Daphnia population performance was attenuated by higher food quantity, but this attenuation size was strongly dependent on MPs size. Path analysis results showed population growth rate was mainly constrained by reduced survival rather than fecundity. Furthermore, the additive null model revealed that the interactive effects of food abundance and MPs were predominately recognized as synergism and trait dependency. The present findings underscore the importance of considering the complexity of interactions that can occur in the wild, when assessing the effects of plastics pollution on population dynamics of the basic trophic level in lakes and ponds.
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Influence of Particle Size and Feeding Conditions on Microplastic Ingestion and Depuration in Daphnia magna
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Scientists found that tiny water fleas (a key food source in aquatic ecosystems) eat more microplastics when they're hungry and when the plastic pieces are smaller, and what they'd previously eaten affected how quickly they cleared the plastic from their bodies. This matters because these tiny creatures are near the bottom of the food chain, so understanding how microplastics build up in them helps researchers predict how plastic pollution might move up toward the fish and seafood we eat.
Food availability is a critical factor in microplastic toxicity testing using Daphnia magna
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Researchers tested how food availability influences the toxicity of microplastics to water fleas, a species commonly used in environmental safety testing. They found that when food was scarce, microplastics caused much greater harm by essentially diluting nutrition as animals consumed particles instead of real food. The study argues that current toxicity tests may underestimate microplastic risks because they use artificially high food levels that mask the food dilution effect.
Effects of food quantity on the ingestion and egestion of MPs with different colors by Daphnia magna
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Laboratory experiments with Daphnia magna showed that food availability significantly influenced how many microplastics of different colors the animals ingested and how quickly they were cleared, with food concentration modifying particle accumulation.
Impact of polystyrene microplastics on Daphnia magna mortality and reproduction in relation to food availability
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Researchers exposed the freshwater crustacean Daphnia magna to polystyrene microplastics under varying food availability conditions and found that microplastic impacts on mortality and reproduction were most severe when food was limited. The study suggests that the ecological effects of microplastics on zooplankton are strongly influenced by nutritional status, with food-stressed organisms being more vulnerable to particle ingestion.
The Effects of Natural and Anthropogenic Microparticles on Individual Fitness in Daphnia magna
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Researchers compared the effects of natural and anthropogenic microparticles on the fitness of the water flea Daphnia magna. The study found that both primary microplastics from cosmetic products and secondary microplastics from degraded plastic waste can have detrimental effects on zooplankton feeding and fitness, with particle shape and weathering influencing toxicity.
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