Diversity (expressed in species richness and QBS index) and abundance of microarthropods (A–B), isopods (C–D) and millipedes (E–F) in different habitat types. Error bars represent means and SE. Please note the different scaling for the Y axes. Letters indicate significant differences amongst the means. Abbreviations – C: cereal fields, CSa: cereal fields adjacent to set-asides, Sa: set-aside fields, G: semi-natural grasslands.