P. Martikainen et al., INTENSITY OF FOREST MANAGEMENT AND BARK BEETLES IN NON-EPIDEMIC CONDITIONS - A COMPARISON BETWEEN FINNISH AND RUSSIAN KARELIA, Journal of applied entomology, 120(5), 1996, pp. 257-264
The population levels of bark beetles in non-epidemic conditions were
compared between intensively managed forests in Finnish Karelia and ex
tensively managed forests in Russian Karelia. Thirty randomly chosen s
ample plots with five window flight traps in each were established in
both countries. The numbers of species and individuals of bark beetles
did not differ between the countries. This indicates that extensive f
orest management has not increased the general level of bark beetle po
pulations. Species assemblages were, however, different between the co
untries and between the forest site types. Hylastes brunneus and Pityo
genes bidentatus, which are common in stumps or in logging residue of
Scots pine, were more abundant in Finland. Crypturgus subcribrosus, Po
lygraphus punctifrons, and Hylurgops glabratus, which prefer dead spru
ce trees in shady conditions, and Trypodendron signatum, which live in
dead deciduous trees, were more common in Russia. Bark beetles were m
ost abundant in old mesic forests. The amount of decaying wood on the
ground did not correlate with the numbers of bark beetles caught.