Earthworm gut bacteria help chew through soil microplastics
Rahayu ID, Iswahyudi I, Sutanto A, Garfansa MP, Meylanzharie Z
Soil Health
The compost bin or vegetable bed you're building healthy soil in could get an assist from earthworms whose gut microbes are quietly breaking down the plastic fragments that turn up in nearly every soil sample tested today.
Scientists reviewed years of research on earthworms and found their gut is home to bacteria, especially types like Bacillus and Streptomyces, that can chew apart tiny plastic particles as the worm digests soil. On top of breaking down plastic, these worms also seem to improve soil nutrients and help plants handle the stress of living in plastic-contaminated ground. Researchers still don't know exactly how fast this breakdown happens or which specific enzymes do the work, but it's a promising sign that garden helpers we already rely on could double as pollution cleanup crews.
Key Findings
Literature synthesis of Scopus-indexed studies from 2018-2025 on earthworm-microplastic-microbiota interactions found degradation involves mechanical fragmentation, selective microbial enrichment, and metabolic activity working together.
Actinobacteria, Proteobacteria, and Firmicutes consistently dominate earthworm gut microbiomes across different species and plastic polymer types, with genera like Bacillus, Paenibacillus, Rhodococcus, and Streptomyces repeatedly linked to plastic transformation.
Earthworm activity was associated with improved soil nutrient availability, more stable soil microbial communities, and greater plant tolerance to microplastic stress, though exact biodegradation rates and responsible enzymes remain unidentified.
chevron_right Technical Summary
Earthworms harbor gut bacteria that help break down microplastics in soil, offering a natural, low-tech way to tackle plastic pollution in farmland and gardens.
Abstract Preview
Original paper
Earthworm Gut Microbiota as a Biological Driver of Plastic Degradation: Implications for Microplastic Mitigation.
Microplastic pollution in terrestrial environments has emerged as a growing threat to agricultural sustainability. Earthworms and their gut microbiota have recently attracted attention as potential...
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