Abstract
The incidence of two bark beetle species, Xylechinus pilosus (Ratzeburg) and Cryphalus saltuarius Weise, in forest-clearcut edges was studied using 100-m sample plot transects perpendicular to the stand edge and penetrating the forest interior. The presence/absence data on species occurrence was analyzed using logistic regression models. Both species showed clear edge avoidance in the 1st 30-m zone from the stand boundary. Distance from the stand boundary, density of breeding material (suppressed spruces), and density of dominant spruces showed positive effects on species incidence in the logistic regression models. The present results show that forest interior specialists occur in the family Scolytidae, and may be useful for predicting indirectly the edge effect on threatened wood-living beetle species related to old-growth forests.
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