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The Orthoptera communities of sub-Mediterranean dry grasslands (Aphyllanthion alliance) in the western Spanish Pyrenees

Sub-Mediterranean dry grasslands (Aphyllanthion alliance) are habitats with high biodiversity that have recently become threatened by abandonment of traditional management activities. Orthoptera communities are highly influenced by the spatial structure and thus indicate the quality of a habitat. The communities can be classified by the occurrence of characteristic Orthoptera species (regional "character species" and/or "differential species" according to P ONIATOWSKI & FARTMANN 2008). We studied the composition of these communities in 21 plots along an elevation gradient from 750 to 1150 m a.s.l. in the Aisa Valley, western Aragonese Pyrenees (Spain). We defined three Orthoptera communities: (i) a community of herb- and grass-rich grasslands (type 1) with the character species Tessellana tessellata, (ii) a community of shrub-rich grasslands (type 2) with the character species Thyreonotus corsicus and Chorthippus binotatus binotatus and the differential species Stenobothrus lineatus and (iii) a community of rocky grasslands (type 3) with the character species Chorthippus b. binotatus and the differential species Oedipoda coerulea. Moreover, we analysed the ecological traits of the character and differential species: Tessellana tessellata prefers homogenous, high and dense vegetation, while the occurrence of Thyreonotus corsicus and Stenobothrus lineatus depends on heterogeneous , vertically wellstructured habitats with herbs and bushes. In contrast, optimal habitats of Oedipoda coerulea are characterized by a high proportion of bare ground, and the occurrence of Chorthippus b. binotatus is restricted to sites with a high dwarfshrub cover.