Box-plots (median values with minimum, maximum and ±SE) of species richness, adult density (specimen/m2) and Shannon diversity of orthopterans in four treatment types (mowing once a year in May; mowing twice a year in May and September; mowing once a year in September; abandoned) in June (Jn), July (Jl) and August (Ag). Significant (p<0.05) differences detected by Mann-Whitney U test are indicated by different letters.