Summary
This study challenges the assumption that farmland biodiversity increases food-safety risk by demonstrating that organic farming systems foster coprophagous beetles and diverse soil bacterial communities that more effectively suppress human-pathogenic E. coli O157:H7 compared to conventional farms. Field observations across 70 US west-coast vegetable operations, combined with laboratory experiments, suggest that farm management practices, coprophage conservation, and pathogen suppression are mechanistically linked. The findings indicate that simplification of agricultural systems may paradoxically increase contamination risk by reducing the biotic resistance afforded by diverse decomposer communities.
UK applicability
The study was conducted on US west-coast farms; UK conditions differ in climate, cropping patterns, and pest fauna, so direct applicability requires validation in British agroecological contexts. However, the mechanisms identified—coprophage diversity suppressing enteric pathogens—are likely relevant to UK vegetable production systems, particularly those managing wild boar or livestock faecal contamination risks.
Key measures
Dung beetle species richness and activity; soil bacterial biodiversity; Sus scrofa faeces removal rates; E. coli O157:H7 suppression capacity of coprophage communities
Outcomes reported
The study measured coprophagous beetle and bacterial communities, faeces removal rates, and pathogenic E. coli O157:H7 suppression across 70 commercial vegetable fields using organic versus conventional farming methods. It assessed both field-based biodiversity surveys and laboratory experiments on pathogen suppression by farm-associated coprophage communities.
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