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Combined and Individual Effects of Tire Wear Particles and Microplastic Fibers on Growth and Oxidative Stress in the Earthworm Eisenia fetida
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Scientists exposed earthworms to tiny bits of tire debris and plastic fibers, the kind that wash off roads and synthetic clothing into soil, and found these pollutants stunted the worms' growth and caused cellular stress, especially when combined. Since earthworms are essential for healthy soil that grows our food, this research is an early warning sign that these common pollutants could be quietly disrupting the ecosystems we depend on, even though the direct impact on humans isn't yet fully understood.
Combined and Individual Effects of Tire Wear Particles and Microplastic Fibers on Growth and Oxidative Stress in the Earthworm Eisenia fetida, Combined and Individual Effects of Tire Wear Particles and Microplastic Fibers on Growth and Oxidative Stress in the Earthworm Eisenia fetida
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Effects of tire particles on earthworm (Eisenia andrei) fitness and bioaccumulation of tire-related chemicals.
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Laboratory experiments showed that tire and road wear particles (TRWPs) impaired earthworm (Eisenia andrei) fitness—reducing reproduction and growth—and led to bioaccumulation of tire-related chemicals in worm tissues. The study provided evidence that TRWPs pose risks to soil invertebrates and the ecosystem functions they support.
Ecotoxicological effects of micronized car tire wear particles and their heavy metals on the earthworm (Eisenia fetida) in soil
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Researchers exposed earthworms to microplastics from ground-up car tires at various concentrations and sizes over 14 and 28 days. They found that the worms preferentially consumed smaller particles, which led to increased heavy metal accumulation and significant signs of oxidative stress at higher concentrations. The study highlights that tire-derived microplastics in soil can harm terrestrial organisms through both physical ingestion and the release of associated toxic metals.
Combined effects of polyethylene microplastics and tire antioxidant 6PPD on earthworm (Eisenia fetida): Oxidative stress and gut microbiota
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Earthworms exposed to microplastics and the tire chemical 6PPD together in soil for 28 days showed signs of stress, including damaged skin and gut tissue and higher levels of stress-related enzymes. The combination also altered the earthworms' gut bacteria, disrupting their networks and metabolism.
Tire Wear Particles Drive a Systemic Bioenergetic Collapse in Eisenia fetida via Coupled Barrier Erosion and Metabolic-Immune Dysregulation
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As electric vehicles grow heavier, their tires shed more worn rubber particles into soil, and new research shows these particles can seriously harm earthworms, damaging their gut lining and skin, disrupting digestion, and overworking their immune systems to the point that many worms lose weight and die. This matters because earthworms are essential for healthy soil that grows our food, so widespread tire pollution could quietly undermine the ecosystems we depend on, a reminder that "cleaner" cars still carry hidden environmental costs.
Understanding the harmful effects of polyethylene microplastics on Eisenia fetida: A toxicological evaluation
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Earthworms (Eisenia fetida) exposed to increasing concentrations of polyethylene microplastics in soil showed lower body weight, reduced reproductive output, and disrupted antioxidant defenses — with oxidative stress markers climbing nearly 1.3-fold at the highest dose. These findings confirm that microplastic pollution degrades soil ecosystem health at concentrations that could plausibly occur in contaminated agricultural land.
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