Spiders were studied in open Sphagnum bogs in Sweden, Finland and northern Norway. Material was collected in pitfall traps. Southern sites (hemiboreal zone) differed from coniferous taiga sites (boreal zone, including three subzones), and also the northern sites, north of taiga (palsa and hemiarctic zones) had their own fauna. Typical abundant species for hemiboreal zone was Pirata uliginosus, for boreal zone(s) Pardosa sphagnicola and P. hyperborea and for palsa and hemiarctic zones Hilaira nubigena and Pardosa atrata. No species was found to be dominant and typical throughout the study area.
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