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Enchytraeus crypticus Avoid Soil Spiked with Microplastic
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Researchers conducted area-choice experiments with the soil invertebrate Enchytraeus crypticus and found the worms actively avoided soils spiked with microplastics, suggesting behavioral avoidance as an ecologically relevant response. The preference to escape microplastic-contaminated soil was observed across multiple polymer types and size ranges.
Microplastics (MPs) of varying sizes are widespread pollutants in our environment. The general opinion is that the smaller the size, the more dangerous the MPs are due to enhanced uptake possibilities. It would be of considerably ecological significance to understand the response of biota to microplastic contamination both physically and physiologically. Here, we report on an area choice experiment (avoidance test) using Enchytraeus crypticus, in which we mixed different amounts of high-density polyethylene microplastic particles into the soil. In all experimental scenarios, more Enchytraeids moved to the unspiked sections or chose a lower MP-concentration. Worms in contact with MP exhibited an enhanced oxidative stress status, measured as the induced activity of the antioxidative enzymes catalase and glutathione S-transferase. As plastic polymers per se are nontoxic, the exposure time employed was too short for chemicals to leach from the microplastic, and as the microplastic particles used in these experiments were too large (4 mm) to be consumed by the Enchytraeids, the likely cause for the avoidance and oxidative stress could be linked to altered soil properties.
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Scientists found that as plastic pollution in soil increases, earthworms and soil insects try to avoid it, and some even die at higher levels. This matters because these creatures keep soil healthy for growing our food, so contaminated soil could eventually affect crops and the food we eat.
Microplastic in soil - Examination of long-term effects and avoidance behaviour in the naturally occurring, endogeic earthworm species Aporrectodea caliginosa
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This collaborative Danish study examined the long-term effects of microplastics in soil on the earthworm Aporrectodea caliginosa, including whether worms would avoid microplastic-contaminated soil. The findings are important because earthworms play a key role in soil fertility, and their exposure to agricultural microplastic contamination has implications for ecosystem health.
How Can Nanoplastics Affect the Survival, Reproduction, and Behaviour of the Soil Model Enchytraeus crypticus?
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Researchers tested how polystyrene nanoplastics affect survival, reproduction, and behavior of a soil worm (Enchytraeus crypticus) across a range of concentrations. They found that nanoplastics impair reproduction and trigger avoidance behavior in this soil-dwelling organism, pointing to ecological risks in contaminated soils.
Effects of Polyethylene Microplastics in Agricultural Soil on Eisenia fetida (Annelida: Oligochaeta) Behavior, Biomass, and Mortality
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Scientists tested how polyethylene microplastics in agricultural soil affected the behavior, body mass, and survival of the earthworm Eisenia fetida. Researchers found that earthworms actively avoided soil contaminated with microplastics and experienced changes in biomass at higher concentrations. The study suggests that microplastic pollution in farmland could negatively affect soil-dwelling organisms that play a key role in maintaining soil health.
Mikroplast i jord - Undersøgelse af langtidseffekter og undvigeadfærd hos den naturligt forekommende, endogæiske regnormeart Aporrectodea caliginosa
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This Danish study examined the long-term effects of microplastics in soil on the earthworm species Aporrectodea caliginosa, testing whether worms avoided or were harmed by microplastic-contaminated soil. Earthworms are important for soil health, and their exposure to microplastics has implications for agricultural ecosystems.
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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.