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61,005 resultsShowing papers similar to Impacts and uptake of environmentally relevant microplastics by Daphnia pulex
ClearSize-dependent chronic toxicity of fragmented polyethylene microplastics to Daphnia magna
Researchers tested the long-term effects of irregularly shaped polyethylene microplastic fragments on the freshwater organism Daphnia magna over 21 days. They found that fragmented microplastics were ingested at much higher rates and caused more harm to reproduction and survival than smooth, round plastic beads of similar size, suggesting particle shape matters for toxicity.
Ecological fitness impairments induced by chronic exposure to polyvinyl chloride nanospheres in Daphnia magna
Researchers exposed the freshwater organism Daphnia magna to environmentally relevant concentrations of polyvinyl chloride and polystyrene nanoplastics over 21 days. They found that PVC nanoplastics caused greater impairments to growth, reproduction, and overall ecological fitness compared to polystyrene particles of similar size. The study suggests that the chemical composition of nanoplastics, not just their size, plays a significant role in determining their toxicity to aquatic organisms.
Ecotoxicological Effects of Polyvinyl Chloride (PVC) Microplastics on the Growth, Reproduction and Survival of Daphnia magna
Researchers exposed Daphnia magna to polyvinyl chloride microplastics at different concentrations, alone and combined with two algal food sources, and measured growth, reproduction, and survival. PVC microplastics reduced fecundity and survival in a dose-dependent manner, with food source type modulating the severity of toxicity effects.
Shape, size, and polymer dependent effects of microplastics on Daphnia magna
Researchers systematically tested how the shape, size, and material of microplastic particles affect the water flea Daphnia magna by comparing polystyrene particles to non-plastic control particles with similar properties. They found that small polystyrene beads and fragments caused harmful effects on reproduction and body shape, while none of the non-plastic control particles caused any damage. The study suggests that the toxic effects are specific to the plastic polymer itself, not simply a result of ingesting small particles.
Shape, size, and polymer dependent effects of microplastics on Daphnia magna
Researchers conducted chronic exposure experiments on Daphnia magna using polystyrene beads (6 and 20 µm), polystyrene fibers, polystyrene fragments, and non-plastic control particles of similar sizes and shapes to systematically disentangle whether observed toxic effects are driven by polymer type, particle shape, or particle size.
Ingestion and Egestion of Microplastics by the Cladoceran Daphnia magna: Effects of Regular and Irregular Shaped Plastic and Sorbed Phenanthrene
Researchers studied how the water flea Daphnia magna ingests and excretes polyethylene microplastics of different shapes and sizes. They found that irregular-shaped fragments were ingested differently than regular beads, and that neither type caused acute mortality at tested concentrations — but the study raises questions about chronic effects in this key freshwater species.
Effects of chronic exposure to environmentally realistic microplastics on Daphnia magna: importance of particle size and morphology and implications for risk assessments
Scientists tested how tiny plastic particles from everyday items like nylon fibers and polystyrene cups affect small water creatures called Daphnia over 21 days. They found that these microplastics get eaten by the creatures and can harm their ability to reproduce and grow, especially the fiber-shaped plastics. This matters because it shows how plastic pollution in water can damage aquatic life, and since microplastics are also found in our drinking water and food, understanding these effects helps us better assess potential risks to human health.
Accumulation, depuration, and potential effects of environmentally representative microplastics towards Daphnia magna
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.
Effects of Microplastics on Aquatic Animals: A Case Study on Daphnia
Researchers exposed Daphnia water fleas to ten types of virgin plastic materials (HDPE, LDPE, PA, PVC, PP, PS, TPU, etc.) and measured survival, reproduction, and behavioral endpoints, finding that PVC and certain engineering plastics caused the greatest acute toxicity while softer polyolefins had lower effects.
Evaluation of the hazard of irregularly-shaped co-polyamide microplastics on the freshwater non-biting midge Chironomus riparius through its life cycle
Laboratory experiments exposed the freshwater midge Chironomus riparius to irregularly shaped co-polyamide microplastics across its full life cycle, finding effects on survival, development, and reproduction at environmentally relevant concentrations. The study highlights that real-world plastic shapes and polymers, not just the smooth spheres commonly used in tests, can harm freshwater invertebrates.
Shape-driven toxicity of polystyrene microplastics: Impacts on physiology and gut microbiota in Daphnia magna
Researchers studied how the shape of polystyrene microplastics affects toxicity in the water flea Daphnia magna, comparing irregular fragments to smooth beads. The study found that fragment-shaped microplastics were more toxic than spherical beads, triggered stronger reactive oxygen species production, and induced different gut microbiota changes, suggesting that particle shape is an important factor in microplastic toxicity.
Assessing the acute differential toxicity of polystyrene microplastic particles and comparing the impacts of bead-shaped versus fragmented particles on Daphnia magna
Researchers compared the toxicity of polystyrene microplastic fragments versus beads on tiny freshwater crustaceans (Daphnia magna) and found that jagged fragments were more harmful than smooth beads, causing greater mortality and triggering more stress-related genes — suggesting that the shape of a microplastic particle matters as much as its chemical makeup.
Review on the ecotoxicological impacts of plastic pollution on the freshwater invertebrate Daphnia
This review examines the ecotoxicological impacts of plastic pollution on the freshwater invertebrate Daphnia, a widely used model organism. Researchers highlight that microplastics affect Daphnia reproduction, growth, and survival, and that chemicals leaching from plastics may contribute additional toxic effects that transfer through food webs.
The complexity of micro- and nanoplastic research in the genus Daphnia – A systematic review of study variability and a meta-analysis of immobilization rates
This meta-analysis examines how micro- and nanoplastics affect Daphnia, a tiny water creature widely used to test the toxicity of pollutants. The research found that plastics can harm Daphnia survival and reproduction, which matters because these organisms are at the base of freshwater food chains that ultimately connect to human water and food sources.
Ecotoxicology of microplastics in Daphnia: A review focusing on microplastic properties and multiscale attributes of Daphnia
This review synthesizes research on how microplastics affect Daphnia, a key organism in aquatic food webs, across individual, population, and community levels. Researchers found that the toxicity of microplastics to Daphnia depends heavily on the physical and chemical properties of the particles, and that combined exposure with other pollutants can produce more severe effects. The study highlights Daphnia as an important indicator species for understanding how microplastic pollution cascades through aquatic ecosystems.
Sublethal effects induced by different plastic nano-sized particles in Daphnia magna at environmentally relevant concentrations
Researchers tested whether nanoplastics made from three different plastics — polystyrene, polyethylene, and polyvinyl chloride (PVC) — harm tiny water fleas called Daphnia magna at environmentally realistic concentrations, finding that PVC nanoplastics caused the most damage to both cellular health and swimming behavior. This suggests that studies focused only on polystyrene nanoplastics may be underestimating the true hazard of nanoplastic pollution.
The Effects of Polyethylene and Polypropylene Microplastics on Daphnia dentifera
Researchers examined the effects of polyethylene and polypropylene microplastics on the body size, swim speed, and clonal growth rate of the freshwater crustacean Daphnia dentifera, assessing sublethal physiological and behavioural impacts of two common plastic polymer types.
Microplastics but not natural particles induce multigenerational effects in Daphnia magna
Daphnia magna were exposed to irregular polyethylene microplastics across multiple generations and compared to naturally occurring mineral particles of similar size; microplastics caused multigenerational reductions in reproduction and body size while natural particles did not, demonstrating particle-type-specific chronic effects.
The Effects of Natural and Anthropogenic Microparticles on Individual Fitness in Daphnia magna
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.
Impacts of polystyrene microplastics on Daphnia magna: A laboratory and a mesocosm study
Laboratory tests and mesocosm experiments with Daphnia magna and polystyrene microplastics found that effects at high concentrations were more related to food dilution than direct toxicity, and population-level effects in mesocosms were minimal. The study emphasizes the importance of using realistic concentrations and multi-species systems to assess microplastic risks.
Toxicological effects of irregularly shaped and spherical microplastics in a marine teleost, the sheepshead minnow (Cyprinodon variegatus)
Researchers compared the toxicological effects of irregularly shaped versus spherical microplastics on sheepshead minnows. Both types accumulated in the digestive system and caused intestinal distention, but irregularly shaped particles were more harmful, reducing swimming behavior more than spherical ones. The study highlights that the shape of microplastic particles matters for toxicity assessments, and commonly used uniform spheres may underestimate real-world risks.
Micro- and nanoplastic effects on the reproduction of Daphnia spp. – a meta-analysis
This meta-analysis pooled data from 369 measurements to assess how micro- and nanoplastics affect reproduction in Daphnia water fleas, a key species in freshwater ecosystems. The results showed that smaller particles, irregular shapes, and certain polymer types caused greater reproductive harm. Since Daphnia are a foundational species in freshwater food webs, their reproductive decline from plastic exposure could cascade through ecosystems that provide drinking water and food.
Short-term exposure with high concentrations of pristine microplastic particles leads to immobilisation of Daphnia magna
Researchers tested the effects of high concentrations of pristine microplastic particles on the water flea Daphnia magna. The study found that short-term exposure to high microplastic concentrations led to immobilisation, and that different polymer types, sizes, and shapes produced varying levels of toxicity, highlighting the importance of particle characteristics in microplastic risk assessment.
Effects of microplastics and natural particles on the aquatic invertebrate Daphnia magna under different dietary quality scenarios
Researchers exposed Daphnia magna to both natural particles—including sediment, algae, and biofilm—and polystyrene microplastics to compare their effects, finding that natural particles caused similar or greater harm than microplastics at equivalent concentrations, highlighting the need for environmental context in MP toxicity studies.