PATCH LEVEL VARIATION ON BARK BEETLE ATTACK (COL., SCOLYTIDAE) ON SNAPPED AND UPROOTED TREES IN NORWAY SPRUCE PRIMEVAL NATURAL FOREST IN ENDEMIC CONDITION - EFFECTS OF HOST AND INSOLATION

Data were obtained from two snapped and five uprooted trees, giving a total of 452 samples. Ips typographus, I. amitinus, Dryocoetes spp., H ylurgops palliatus, H. glabratus, Pityogenes chalographus, Polygraphus polygraphus, P. subopacus, Pityophthorus pityographus, Xyloterus line atus and Xilechinus pilosus were present. Cluster analysis, factor dis criminant analysis and analysis of variance were performed. Results sh ow that the spatial distribution of bark beetles on snapped and uproot ed trees is mostly correlated to trunk geometry and to insolation. Tim ing of bark beetle is especially influenced by the connection of the t runk with the root system.