Arachnologische Mitteilungen 56

18 N. Polchaninova, I.García-Mijangos, A. Berastegi, J. Dengler & I. Biurrun tains in the northeast to the Ebro depression in the south (Fig. 1).Three biogeographic units are represented in Navarre: Alpine, Atlantic and Mediterranean. The climate changes from Mediterranean in the south of the study area to temper- ate in the north, with the temperate sub-Mediterranean type in transitional areas. The ombrotype varies from semiarid to subhumid in the Mediterranean Region and from humid to hyperhumid in the Atlantic and Alpine Regions (Peralta et al. 2013). The natural vegetation is highly diverse, given the marked climatic and biogeographic gradient. Deciduous oak and beech forests prevail in the northern areas and Mediter- ranean evergreen woodlands and scrubs in the south (Loidi & Báscones 2006, Peralta et al. 2013). Sampling was carried out in a great variety of grasslands, ranging from subalpine grass- lands, through mesic meadows, dry grasslands to endorheic basins, belonging to ten associations and six phytosociological classes (Berastegi 2013), most of them being semi-natural, i.e. maintained by human activity. Subalpine grasslands belong to the class Juncetea trifidi, which groups acidophilous swards of the Pyrenees. Basophi- lous subalpine and supratemperate grasslands in the high mountains are included in the class Elyno-Seslerietea. At middle elevation, in submediterranean territories, the sam- pled grasslands belong to the classes Festuco-Brometea and Festuco hystricis-Ononidetea striatae. The former occupies deep baso-neutrophilous soils and the latter, rich in dwarf scrubs, grows in shallow and stony soils. The class Lygeo sparti-Stipetea tenacissimae comprises basophilous xerophit- ic grasslands from dry and semiarid Mesomediterranean ar- eas. Finally, communities growing in endorheic areas with salty soils are included in the class Salicornietea fruticosae (Mucina et al. 2016). Fig. 1: Collecting localities of the 7 th EDGG FieldWorkshop in Navarre. For locality numbers, see Material and methods.