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61,005 resultsShowing papers similar to Difference in sensitivity of Daphnia magna to pristine and aged microplastic fibers
ClearDifference in sensitivity of Daphnia magna to pristine and aged microplastic fibers
Researchers compared the sensitivity of Daphnia magna to pristine versus aged microplastic fibers, which make up a large proportion of environmental plastic pollution. Aged fibers showed different toxicity profiles than pristine fibers, highlighting the need to use environmentally weathered particles in ecotoxicology tests.
Uptake and effects of microplastic textile fibers on freshwater crustacean Daphnia magna
Researchers exposed the freshwater crustacean Daphnia magna to ground PET textile microfibers for 48 hours and found that fiber ingestion increased mortality in food-deprived organisms and that daphnids could not recover after transfer to clean water, providing the first evidence of PET textile microfiber bioavailability and toxicity in a standard ecotoxicology model.
Virgin and UV-weathered polyamide microplastics posed no effect on the survival and reproduction of Daphnia magna
Researchers found that neither virgin nor UV-weathered polyamide microplastics affected the survival or reproduction of Daphnia magna, suggesting this polymer type poses limited acute toxicity to freshwater zooplankton under tested conditions.
Acute toxicity of natural and synthetic clothing fibers towards Daphnia magna: Influence of fiber type and morphology
Researchers tested the toxicity of natural and synthetic clothing fibers on small freshwater organisms (Daphnia magna) and found that nylon microfibers were acutely toxic, while natural fibers like cotton and silk caused no significant harm. Smoother fibers were more toxic than frayed ones, and the actual ingestion of fibers mattered more than how many were present in the water. These findings are important because textile fibers make up a large portion of microplastics in waterways and can enter the human food chain through contaminated aquatic organisms.
Effects of synthetic and natural microfibers on Daphnia magna–Are they dependent on microfiber type?
Researchers compared the effects of synthetic microfibers (polyester and polypropylene) and natural microfibers (lyocell) on the water flea Daphnia magna. The study found that even natural microfibers caused significant harm, including reduced gut microvilli length, impaired nutrient absorption, growth inhibition, and mortality, confirming that microfiber toxicity is not limited to synthetic materials.
Multi-level approach to investigate sublethal effects caused by synthetic and natural microfibers on Daphnia magna
Researchers exposed freshwater organisms including amphipods and oligochaetes to synthetic and natural microfibers at multiple levels of biological organization, finding that both fiber types caused sublethal physiological and behavioral effects, with synthetic fibers generally producing greater harm.
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.
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.
Microplastics originated from Plasmix-based materials caused biochemical and behavioral adverse effects on Daphnia magna
Researchers assessed the toxicity of microplastics derived from Plasmix, a heterogeneous recycled plastic fraction, on the freshwater crustacean Daphnia magna over 21 days. They found that both naive and additivated Plasmix microplastics were ingested by the organisms, causing changes in oxidative status, antioxidant enzyme activity, and lipid peroxidation. The study highlights the importance of eco-safety evaluation before deploying new materials made from recycled plastic waste.
Exposure medium and particle ageing moderate the toxicological effects of nanomaterials to Daphnia magna over multiple generations: a case for standard test review?
This study found that the toxicological effects of engineered nanomaterials on Daphnia magna varied depending on the exposure medium and whether particles had been environmentally aged, with aged particles behaving differently from pristine ones across multiple generations. The findings suggest that standard ecotoxicology test protocols designed for pristine particles may not accurately reflect real-world risks from weathered nanoplastics and nanomaterials.
Microplastics modify the toxicity of glyphosate on Daphnia magna
Daphnia magna were exposed to three glyphosate formulations combined with polyethylene microbeads or PET/PA fibers for one week, finding that microplastics altered (mostly reduced) the toxicity of glyphosate depending on formulation and plastic type. The study demonstrates that microplastics can modulate pesticide bioavailability and toxicity in freshwater crustaceans.
Effects of Polyester Fibers and Car Tire Particles on Freshwater Invertebrates
Researchers assessed the ingestion and effects of polyester fibers and car tire particles on four freshwater invertebrate species under acute and chronic exposure conditions. The study found that while both microplastic types were ingested by all species tested, car tire particles caused greater mortality in Daphnia magna and Hyalella azteca. The results suggest that the chemical composition of microplastics plays an important role in their toxicity to freshwater organisms.
Effect of aging on polyethylene microfiber surface properties and its consequence on adsorption characteristics of 17alpha-ethynylestradiol
Researchers found that aging alters the surface properties of polyethylene microfibers and changes their consequences for aquatic organisms. Weathered microfibers exhibited different surface chemistries and caused different biological effects compared to pristine fibers, highlighting the importance of considering plastic aging in environmental risk assessments.
Impact of Microplastic Beads and Fibers on Waterflea (Ceriodaphnia dubia) Survival, Growth, and Reproduction: Implications of Single and Mixture Exposures
Researchers tested the acute and chronic effects of polyester fibers and polyethylene beads, both individually and as mixtures, on the freshwater zooplankton Ceriodaphnia dubia. Both types caused dose-dependent survival effects in acute exposures, and chronic exposure reduced growth and reproduction even at lower concentrations. The study found that fiber-bead mixtures produced less than additive effects, suggesting the two forms of microplastics interact in complex ways.
Ecotoxicology of Polystyrene Microplastic Fragments: Oxidative Stress Effects in Neonate Versus Adult Daphnia magna
Researchers exposed neonate and adult Daphnia magna, a key freshwater organism, to polystyrene microplastic fragments to assess oxidative stress effects. They found that younger organisms were significantly more sensitive to microplastic exposure, showing greater oxidative stress and reduced antioxidant responses compared to adults. The study highlights that life stage is an important factor when evaluating the ecological risks of microplastic pollution in aquatic environments.
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.
Influence of synthetic and natural microfibers on the growth, substance exchange, energy accumulation, and oxidative stress of field-collected microalgae compared with microplastic fragment
Researchers tested how synthetic microfibers from plastics like PET and polypropylene affect freshwater algae compared to natural fibers like cotton and wool. The synthetic fibers inhibited algae growth more than natural fibers and caused oxidative damage to the cells, with fiber-shaped particles being more harmful than fragments of the same material. Since algae form the base of aquatic food chains, damage to them from microplastic fibers could ripple through ecosystems and affect the fish and water that humans depend on.
Sublethal impacts of fragmented polyethylene nanoplastics on Daphnia magna following chronic exposure
Researchers exposed Daphnia magna (water fleas) to fragmented polyethylene nanoplastics over a chronic period and observed adverse sublethal effects. The study suggests that even at concentrations that do not cause outright mortality, fragmented nanoplastics from real-world polyethylene degradation can impair the health and function of these important freshwater organisms.
Cotton and polyester microfibers cause chronic toxicity in the freshwater invertebrate Chironomus dilutus
Researchers compared the chronic toxicity of cotton and polyester microfibers on the freshwater invertebrate Chironomus dilutus, testing both clean fibers and fibers soaked in wastewater treatment effluent. The study found that both fiber types caused toxic effects, highlighting that microfiber pollution in aquatic environments is not limited to synthetic plastics and that associated chemicals can increase toxicity.
Changes in life-history traits, antioxidant defense, energy metabolism and molecular outcomes in the cladoceran Daphnia pulex after exposure to polystyrene microplastics
Researchers exposed the freshwater zooplankton Daphnia pulex to polystyrene microplastics and observed dose-dependent effects on survival, antioxidant capacity, and energy metabolism. The study found that microplastics accumulated in the digestive tract, caused lipid oxidative damage, disrupted sugar and fat metabolism, and activated DNA repair mechanisms while inhibiting lipid metabolism pathways.
Biochemical and behavioral effects induced by conventional and bio-degradable plastics towards the cladoceran Daphnia magna
Researchers exposed Daphnia magna to PET and PLA microplastics at three concentrations over 21 days, assessing biochemical endpoints including oxidative stress markers, antioxidant enzymes, lipid peroxidation, energy reserves, and swimming behavior. Both fossil-based PET and biobased PLA microplastics induced measurable stress responses at sub-individual and individual levels, demonstrating that bioplastics do not necessarily present a safer environmental profile than conventional polymers.
Incubation in Wastewater Reduces the Multigenerational Effects of Microplastics inDaphnia magna
Researchers compared the multigenerational toxicity of pristine versus wastewater-aged microplastics on the freshwater organism Daphnia magna. They found that microplastics incubated in wastewater, which sorbed a complex mixture of real-world pollutants, actually showed reduced toxicity compared to pristine particles across multiple generations. The study suggests that environmental aging processes may alter the toxicological profile of microplastics in ways that are not always predictable from laboratory studies with pristine particles.
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.
Multi-level approach to evaluate the toxicity of virgin and weathered microplastics made of polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT) on Daphnia magna
This study evaluated the toxicity of virgin and weathered bioplastic microplastics made from PLA and PBAT on Daphnia magna using a multi-level approach examining survival, reproduction, and molecular endpoints. Weathered bioplastic particles showed altered toxicity compared to virgin materials, demonstrating that environmental aging changes the hazard profile of biodegradable plastics.