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Comparative analysis of the toxicity of fragmented and fibrous microplastics versus natural particles in the sea squirt Ciona intestinalis type A (Ciona robusta)
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Scientists found that when tiny sea creatures (sea squirts) were exposed to different types of microplastic pollution, irregularly shaped weathered plastic fragments and fibers were toxic, while perfectly round plastic beads and natural particles weren't—suggesting the shape and type of plastic matters more than just its presence. Since these filter-feeding animals are similar to shellfish we eat, this research is an early clue that the *kind* of microplastic pollution in our oceans (not just how much) could matter for marine food safety, though more research is needed to know what this means for human health specifically.
Microplastics (MPs) are ubiquitous in marine environments and readily ingested by filter-feeding organisms, yet the ecotoxicological effects of irregularly shaped MPs remain poorly understood. This study assessed the accumulation and survival effects of aged fragmented polyethylene (afrPE), Nile red-stained afrPE (NR-afrPE), and fibrous polyethylene terephthalate (fiPET) following 168 h of exposure in Ciona intestinalis Type A (C. robusta), with spherical polystyrene (sPS) MPs and inorganic particles (IOPs) included for comparison. Among fragmented MPs, afrPE showed the highest toxicity at 30 and 100-μm (NOEC: 0.099 and < 0.100 mg L), whereas 10-μm afrPE showed no detectable toxicity (NOEC: 1 mg L). NR-afrPE showed a similar pattern (NOEC: 0.24 and < 0.099 mg L at 30 and 100-μm, respectively). FiPET showed intermediate toxicity (NOEC: 0.212 at 20-μm; 0.267 at 50-μm). In contrast, sPS (NOEC: >0.977->0.999 mg L) and IOPs (NOEC: 1 mg L) showed no detectable toxicity. MP accumulation was significantly influenced by concentration and particle size (p < 0.05), whereas survival was affected by concentration and particle shape (p < 0.05), with no significant size effect on toxicity (p > 0.05). These findings indicate that particle size influences accumulation, while toxicity is primarily governed by particle type and exposure concentration.
More Papers Like This
Physiological responses of juvenile Ciona intestinalis type A (C. robusta) to microplastic shape and size: Pronounced effects of fibrous particles
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Researchers exposed juvenile sea squirts to three different shapes of microplastics and found that fibrous particles had the most pronounced negative effects on heart rate, squirting activity, and mucus secretion. The shape of microplastics proved to be a more important factor than size or chemical composition in determining biological impact. The findings highlight that fiber-shaped microplastics, which are among the most common forms in the ocean, may pose greater risks to marine organisms than spherical particles.
Size- and shape-dependent ingestion and acute toxicity of fragmented and spherical microplastics in the absence and presence of prey on two marine zooplankton
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Researchers tested how the size and shape of microplastics affect their toxicity to tiny marine animals called zooplankton. Smaller particles were swallowed more often, but irregularly shaped fragments were more toxic than smooth spheres of similar size. When natural food was present, the animals ate fewer microplastics, suggesting that real-world toxicity depends on both particle characteristics and environmental conditions.
Comparative impacts of fragmented versus spherical microplastics on the marine rotifer Brachionus koreanus: Multigenerational chronic toxicity and multi-omics perspective
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This study found that the shape of microplastic particles matters more than their size when it comes to toxicity. Small, jagged fragments caused more harm to tiny marine animals called rotifers than smooth round beads, reducing their ability to reproduce and shortening their lifespan across multiple generations. The findings suggest that irregularly shaped microplastics, which are the most common type found in the environment, may be more dangerous than the smooth spheres typically used in lab studies.
Size matters more than shape: Ingestion of primary and secondary microplastics by small predators
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Researchers offered irregularly shaped secondary microplastics — fragments more realistic than the perfect spheres used in most lab studies — to small fish and shrimp at natural concentrations, finding that particle size was a stronger predictor of ingestion than shape. The study underscores that lab results using uniform plastic beads may overestimate real-world microplastic uptake in marine food webs.
Size-dependent chronic toxicity of fragmented polyethylene microplastics to Daphnia magna
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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.
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