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A comparison with natural particles reveals a small specific effect of PVC microplastics on mussel performance
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Effects of PVC microplastics on marine animals were compared to effects of natural particles at equivalent concentrations, to distinguish plastic-specific effects from generic particle effects. The comparison revealed a small specific effect of PVC microplastics beyond what natural particle exposure causes, suggesting that many microplastic impacts may be partly attributable to physical particle load rather than plastic chemistry alone.
Effects of microplastics on marine taxa have become a focal point in marine experimental biology. Almost all studies so far, however, assessed the influence of microplastics on animals only in relation to a zero-particle group. Documented microplastic impacts may thus be overestimated, since many marine species also experience natural suspended solids as a stressor. Here, we compared the effects of polyvinyl chloride (PVC) and red clay (mean for both particles: ~12-14 μm) on the Mediterranean mussel Mytilus galloprovincialis across three particle concentrations (1.5, 15, 150 mg l). Exposure to PVC for 35 days lowered mussel body condition index by 14% in relation to clay, but no difference in byssus production, respiration and survival rates emerged between the two particle types. This suggests that the effects of synthetic particles on filter feeders may emulate those of natural suspended solids, and highlights the importance of including natural particles in microplastic exposure studies.
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Differential effects of polyvinyl chloride microplastics and kaolin particles on gut immunity of mussels at environmental concentrations
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Researchers compared the toxicity of PVC microplastics and natural kaolin particles on thick-shelled mussels, finding that microplastics caused greater harm overall. Through layered experiments, they demonstrated that the chemical additives leaching from PVC, combined with its physical effects, drive the higher toxicity compared to natural particles. The study suggests that both the physical presence and the chemical composition of microplastics contribute to their harmful effects on marine organisms.
Plastic and natural inorganic microparticles do not differ in their effects on adult mussels (Mytilidae) from different geographic regions
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Researchers compared the effects of plastic microparticles and natural inorganic particles on mussels from five geographic regions, finding no significant differences between particle types, suggesting that physical particle stress rather than plastic-specific chemistry drives observed effects.
Effects of microplastics (PVC, PMMA) on the mussel Semimytilus algosus differ only at high concentrations from those of natural microparticles (clay, celite)
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Researchers found that microplastics (PVC and PMMA) only negatively affected the mussel Semimytilus algosus at unrealistically high concentrations, with effects similar to those of natural microparticles like clay and celite at the same levels.
Suspended micro-sized PVC particles impair the performance and decrease survival in the Asian green mussel Perna viridis
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Researchers exposed aquatic organisms to suspended micro-sized PVC particles and found impaired performance and reduced survival, demonstrating that PVC-specific microplastics cause measurable harm at concentrations approaching those found in some polluted environments.
Effects of microplastics contamination on marine biota
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Researchers exposed mussels to PVC microplastics under different conditions, finding that short-term exposure caused physiological stress influenced by plastic additives and concentration, while long-term exposure allowed some adaptation. Microplastics were transferred along the food chain to predators but were not absorbed into tissues, suggesting physical passage rather than bioaccumulation.
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