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What happens to microplastics when swallowed? In earthworms, they do not leave the digestive tract
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Earthworms on a microplastics diet
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Researchers found that environmentally relevant concentrations of polyethylene microplastics added to plant litter on soil surfaces led to reduced growth and elevated mortality in the earthworm Lumbricus terrestris, and that earthworms may themselves transport ingested microplastics deeper into soils.
The Possibility of Microplastic Removal by Earthworms and Comparing With Conventional Chemical Removal Methods (A Global and Deeply Systematic Review)
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Researchers reviewed chemical and biological strategies for microplastic removal, finding that certain earthworm species can absorb and decompose microplastic particles within weeks, offering a potentially low-cost biological alternative to conventional chemical removal methods.
What happens when plastics break down into microplastics and nanoplastics?
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Researchers Jeff Farner and Bukola Alimi are investigating the chemical and physical transformations that occur as plastic pollution weathers into microplastics and nanoplastics in the environment, tracking how particle properties change over time. Understanding the weathering process is critical because smaller nanoplastic particles exhibit greater biological uptake efficiency and may cross cellular barriers — including the gut, lung, and blood-brain barrier — at higher rates than larger microplastics.
Meta-analysis reveals contrasting effects of biodegradable and conventional microplastics on earthworm fitness, physiology, and gut microbiota
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A large analysis of over 100 studies found that both regular plastic pollution and "biodegradable" plastics harm earthworms, shrinking their survival, growth, and gut bacteria, while causing cell damage from oxidative stress. The key takeaway: switching to biodegradable plastics doesn't actually protect these important soil creatures, so it's not a guilt-free fix. Since earthworms keep soil healthy for growing our food, this matters for the whole food chain, including us, and it's a reminder that "biodegradable" labels don't always mean "harmless."
Fragmentation and depolymerization of microplastics in the earthworm gut: A potential for microplastic bioremediation?
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Researchers explored whether earthworms can break down microplastics in soil by passing them through their digestive systems. They found that earthworms fragmented and partially broke down polyethylene and biodegradable plastic particles, reducing their size and altering their chemical structure. This suggests earthworms could play a role in naturally reducing microplastic contamination in soil, though more research is needed to understand whether the smaller fragments pose their own risks.
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