Individual study: Low intensity meadows harbour endangered grasshopper
Jöhl R., Knop E., Herzog F., Jeanneret P., Walter T., Duelli P. & Ewald K.C. (2004) Low intensity meadows harbour endangered grasshopper. Agrarforschung, 11, 156-161
This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.
Reduce management intensity on permanent grasslands (several interventions at once)
A replicated, controlled, paired sites study in August in 21 field pairs in three farmland regions (Bauma, Ruswil and Flühli) in Switzerland (Jöhl et al. 2004) found higher species richness and abundance of grasshoppers (Orthoptera: Caelifera) in low-intensity meadows than in intensively managed meadows. Species richness and the number of rare species were higher in low intensity meadows in two regions (Bauma: average 4.4 vs 2.9 species and Flühli: 5.9 vs 4.6 spp.), but no difference was found between the meadow types in Ruswil (2.6 spp. both). Grasshopper abundance was higher in low intensity meadows than in intensively managed meadows in all regions (Bauma: average 24.07 vs 24.14 individuals/; Ruswil: 22.29 vs 19.71 ind.; Flühli: 26.21 vs 21.93 ind.). Transect location (field edge or centre) did not affect grasshopper species richness or abundance. Seven field pairs (each consisting of one low intensity and one intensive meadow with similar environmental conditions) were investigated in each region. Grasshoppers were monitored in August along two 95 m long transects in each meadow (one along the field edge and one in the field centre). Transects were walked slowly for 15 minutes, and all observed grasshoppers were caught to determine species richness and grasshopper density.