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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)
Summary
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.