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Effects of Aged Polymethylmethacrylate Microplastics on Physiological Biochemistry and Intestinal-Sediment Microbial Communities of Urechis unicinctus (von Drasche, 1881)
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Scientists exposed marine worms (a common seafood and fishing bait species) to weathered plastic particles and found that high doses caused stress damage in the worms' bodies and increased harmful bacteria like Klebsiella in the surrounding sediment. This matters because it shows aging plastic debris in the ocean can disrupt marine ecosystems and promote pathogen growth, raising concerns about the safety of seafood from polluted waters and the broader spread of plastic-linked health risks through the food chain.
Microplastics (MPs) widely distribute in marine environments and generate severe hazards to marine biota, yet little is known regarding the toxic impacts of aged MPs on benthic invertebrates and their surrounding sediment microbiota. This work aimed to fill this research gap by exploring the comprehensive toxicity of aged polymethylmethacrylate microplastics (PMMA-MPs) toward Urechis unicinctus and its sediment habitat. A 21-day laboratory exposure trial was performed with two PMMA-MP treatments: environmentally realistic low concentration (10 μg/L) and extreme high concentration (1000 μg/L). Aged PMMA-MPs accumulated in the body wall and intestine of U. unicinctus, with markedly higher body wall MPs loads in the high-dose group (p < 0.05). High-concentration PMMA-MPs significantly raised intestinal total protein and triggered intense oxidative stress (p < 0.01), and the Integrated Biomarker Response value rose dose-dependently. Sediment microbial β-diversity was obviously reshaped (p < 0.05), with enriched pathogens including Klebsiella and Enterobacteriaceae under high MP exposure, while the worm’s intestinal α-diversity and core microbiome remained stable, showing host adaptability. This study reveals multi-level toxic outcomes of aged PMMA-MPs on benthic worms and their sediment microhabitat, offering fundamental data to evaluate the ecological risks of weathered MPs in marine benthic systems.
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Microplastics - Back to Reality: Impact of Pristine and Aged Microplastics in Soil on Earthworm Eisenia fetida under Environmentally Relevant Conditions
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Researchers compared the effects of new versus sunlight-aged polyethylene microplastics on earthworms at real-world contamination levels, finding that aged particles caused more harm. The aged microplastics accumulated more in earthworm guts, caused greater tissue damage, and shifted gut bacteria away from beneficial species toward harmful ones. This is significant because most microplastics in the environment have been aged by sunlight, meaning their actual impact on soil health and the food chain may be worse than lab studies using fresh plastics suggest.
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Researchers exposed earthworms to polyethylene microplastics of different sizes alongside a common fungicide and found that smaller microplastics caused the most severe oxidative stress and DNA damage. The microplastics also changed how much fungicide accumulated in the earthworms and disrupted their gut bacteria. This matters because earthworms are essential for soil health, and these effects could ripple through agricultural ecosystems that produce our food.
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Scientists studied how gut bacteria affect the health impacts of microplastics (tiny plastic particles) using lab worms as a model. They found that different types of plastic-eating bacteria in the gut can either make microplastic exposure more harmful or help protect against it. This research suggests that the specific mix of bacteria in our intestines might influence how dangerous microplastics are to our health.
Unveiling the impact of short-term polyethylene microplastics exposure on metabolomics and gut microbiota in earthworms (Eudrilus euganiae)
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Researchers exposed earthworms to polyethylene microplastics and found significant disruptions in their metabolism and gut bacteria, even when no visible signs of stress were present. The microplastics affected energy and lipid metabolism, anti-inflammatory processes, cell signaling, and membrane integrity. The study suggests that microplastics can cause hidden biological harm to soil organisms well before any outward symptoms appear.
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Researchers exposed lugworms to sediment containing 5% microplastic pre-loaded with pollutants and plastic additives, confirming that ingested microplastic transfers chemicals into gut tissue — with nonylphenol uptake from PVC reducing immune cell function by over 60% and triclosan from PVC causing sediment-engineering impairment and mortality exceeding 55%.
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