Associations between parasitoid species richness and landscape cover within 500m of 35 organic vegetable fields.
Plots showing significant correlations between the total species richness (ichneumonids+braconids+tachinids) in summer 2005 Malaise traps and the percentage cover of three vegetation types that changed in the region subsequent to the 2006 E. coli contamination event: cropland (A), natural habitat (excluding riparian and exotic trees) (B), and riparian habitat (C).