Summary
This field study across 70 US west-coast vegetable farms compared organic and conventional production systems to examine whether farm biodiversity influences food safety risk through coprophagous (faeces-feeding) arthropod and microbial communities. Organic farms hosted more dung beetle species that removed pathogenic vector faeces more rapidly, and harboured significantly higher soil bacterial diversity; both communities proved more effective at suppressing human-pathogenic E. coli O157:H7 in the laboratory. The findings suggest that farm management practices promoting coprophage conservation may simultaneously reduce human-pathogen contamination risk, linking agricultural biodiversity to food safety outcomes.
UK applicability
The findings are potentially relevant to UK vegetable production and organic certification standards, though temperate climate differences, landscape context (UK farms are typically smaller and more hedgerow-rich), and different dominant dung beetle and bacterial assemblages may modulate the magnitude of the effect. Uptake would benefit from UK-specific field validation and assessment of coprophage communities in British soils and farmland.
Key measures
Dung beetle species richness and faeces removal rates (Sus scrofa); soil bacterial diversity (16S rRNA or similar); E. coli O157:H7 suppression efficacy in vitro
Outcomes reported
The study measured dung beetle abundance and activity, soil bacterial biodiversity, and faeces removal rates across 70 commercial vegetable fields in organic versus conventional systems. Laboratory experiments assessed the effectiveness of farm-associated coprophage communities in suppressing E. coli O157:H7.
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