BARK BEETLE (COL, SCOLYTIDAE) COMMUNITIES AND HOST AND SITE FACTORS ON TREE LEVEL IN NORWAY SPRUCE PRIMEVAL NATURAL FOREST

Bark beetle infestations on tree level in spruce primeval natural fore st in the 'Pol'ana nad Detvou' natural reserve in Central Slovakia wer e classified into communities of Hylurgops palliatus/H. glabratus, Dry ocoetes hectogaphus. Ips typographus, Xylechinus pilosus, Polygraphus polygraphus and Xyloterus lineatum/Ips typographus. Effects of host an d site factors in separating the bark beetle communities were quantita tively evaluated. Cluster and discriminant analyses were used. The rel ative influence of each factor for community separation varied among c ommunities. The most important factors were the state of the material, canopy closure and the stage of the primeval natural forest. Dimensio n, stage of decay, elevation, exposure, soil acidity, potential forest vegetation type and the year of succession had statistically signific ant effects.