EN
During the two years of observations (2008–2009) conducted on the field groves in Bartążek near Olsztyn (UTM 65) a total number of 3 478 spiders belonging to 12 families, 49 genera and 89 species were trapped by using a sweep-net. The most numerous families were Tetragnathidae and Linyphidae, but the riechest in species were Linyphidae (30 species), Araneidae (14 species), Tetragnathidae and Thomisidae (each 9 species). The dominant species was Metellina segmentata and subdominants were Enoplognatha ovata, Pachygnatha listeri, Tetragnatha montana (2008–2009) and Linyphia triangularis in 2009. Also very rare species was found – Philodromus albidus. The observations showed that field groves were very rich source of species diversity of foliage-dwelling spiders, as potential predators of pests in agrocenosis.