Abstract
Abstract Insects of mesic and hydric habitats may be affected by increased frequency of summer droughts brought about by climate change, in addition to habitat degradation caused by scrub encroachment. The common green grasshopper Omocestus viridulus prefers moist grassland and is relatively rare in the County of Essex, perhaps being limited by low precipitation in southeastern England. The abundance and distribution of O. viridulus populations were compared for high- (Epping Forest) and low-precipitation areas using Geographic Information Systems (GIS) software. Populations were aggregated in Epping Forest (population isolation: 1 km), a high precipitation area (ca 69 cm precipitation/yr), and present on both well and poorly drained soils where acid grassland/wet heathland occurred. Outside of the Forest, where precipitation was generally lower (ca 58 cm/yr), populations of this grasshopper were highly isolated (isolation: 4 km) and more often present on clay soils with high water retention in winter/ear...
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