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Microplastics and earthworms in soils: A case study on translocation, toxicity and fate
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This conference abstract presents research on how earthworms in agricultural soils interact with microplastics, examining whether worms translocate particles deeper into soil, experience toxic effects, and alter the fate of microplastic contamination. Earthworms are key soil engineers, and their exposure to microplastics could have cascading effects on soil health.
Microplastics are not only found in marine and lacustrine environments but also in soils. Microplastics enter natural soil environments from legal or illegal waste deposition. In arable soils, microplastics often stem from the decomposition of plastic sheeting. The accumulation of (micro-)plastic from garbage bags in which biological waste is often disposed, is also a significant problem for the recycling and composting of organic waste. Commercially available compostable bags are advertised as degradable. Thus, these compostable bags ought to accumulate less in soils than non-compostable bags. We present a pilot study to determine the preference of earthworms (Lumbricus terrestris and Eisenia hortensis) for taking up and translocating different types of microplastic in soils. Our initial findings from the soil column experiment suggest that the earthworms show a strong tendency for the uptake of microplastic. We also observed direct and indirect transport of microplastic by earthworms from the surface to deeper parts of the soil columns.
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Microplastic-Earthworm Interactions: A Critical Review
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This critical review examines how microplastics from diverse plastic waste categories accumulate in terrestrial and aquatic ecosystems and interact with earthworms, a key soil organism. The authors synthesize evidence on the deleterious effects of increasing microplastic concentrations on soil properties, microbiota, and earthworm physiology.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.