Spiders (Araneae) from three human-influenced habitats in the Golsfjellet mountain area, central southern Norway
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Abstract
Three sites at 900 m a.s.l. in the sub-alpine mountain birch forest region and under different levels of human-influence were investigated. Site 1: An open birch forest with some scattered spruces, a rich bush and field layer and a rich moss cover; very little grazed. Site 2: Tree and bush layer removed, a rich field layer invaded by open area species and some ’culture indicators’; there was a rich moss cover. Site 3: Grazed; tree layer, bush layer and moss cover absent. Pitfall trapping (18 May – 18 Aug. 2000) in site 1 - 3 resulted in 48, 48 and 22 spider species (in total 64 species). In site 1 and 2 Pardosa riparia (C.L.Koch, 1833) and Alopecosa pulverulenta (Clerck, 1757) were dominating. P. sphagnicola (Dahl, 1908) was also fairly common in site 1, P. palustris and P. hyperborea (Thorell, 1872) in site 2. Site 3 was almost completely dominated by Pardosa palustris (73.2 %) and Erigone atra Blackwall, 1841 (18.2 %); present (absent elsewhere) were also some specimens of Oedothorax retusus (Westring, 1851) (4.6 %).
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