Effects of selection cutting on the longicorn and scolytid beetle assemblages in an old-growth boreal mixed conifer-broadleaf forest in Hokkaido

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  • SAYAMA Katsuhiko
    Hokkaido Research Center, Forestry and Forest Products Research Institute
  • UEDA Akira
    Hokkaido Research Center, Forestry and Forest Products Research Institute
  • ITO Masato
    Hokkaido Research Center, Forestry and Forest Products Research Institute
  • OZAKI Kenichi
    Hokkaido Research Center, Forestry and Forest Products Research Institute:(Present office)Department of Forest Entomology, Forestry and Forest Products Research Institute

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Other Title
  • 北海道における択伐が原生的な亜寒帯性針広混交林のカミキリムシ相とキクイムシ相に及ぼす影響
  • ホッカイドウ ニ オケル タクバツ ガ ゲンセイテキナ アカンタイセイ シンコウ コンコウリン ノ カミキリムシソウ ト キクイムシソウ ニ オヨボス エイキョウ

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Abstract

We examined the effects of selection cutting on the longicorn and scolytid beetle assemblages in an old-growth mixed conifer-broadleaf forest in Hokkaido. We collected these beetles in the selection cutting and non-cutting sites in the old-growth forest using collision traps baited with chemical attractants. In longicorn beetles, species richness, abundance, diversity indices, species composition and the number of individuals of each species did not differ significantly between the selection cutting and non-cutting sites before selection cutting. However, two years after selection cutting, species richness and the number of individuals of three species of Lepturinae were significantly greater in the selection cutting site than in the non-cutting site. This would be resulted from increased relative light intensity and canopy openness after selection cutting. These factors could enhance the attractiveness of the traps to flower-visiting species. In scolytid beetles, no significant effects of selection cutting on species richness, abundance, diversity indices, species composition and the number of individuals of each species were detected. Previous studies have reported negative effects of selection cutting on forest insects, particularly on saproxylic species. However, this study did not detect such effects probably because (1) the amount of dead wood did not decrease with selection cutting, (2) the study areas were too small, and/or (3) the old-growth forest was too small and was isolated from other old-growth forests.

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