Monitoring longicorn beetles in different forest types using collision traps baited with chemical attractants
2005
Sayama, K.(Forestry and Forest Products Research Inst., Sapporo (Japan). Hokkaido Research Center) | Makihara, H. | Inoue, T. | Okouchi, I.
To examine the relationship between forest environment and longicorn beetle species, which are useful as biological indicators of forest conditions, we investigated assemblages of longicorn beetles in different forest types. This study was conducted at 8 or 9 sites in two research areas, Kitaibaraki and Mt. Tsukuba, in Ibaraki prefecture of central Japan using collision traps baited with chemical attractants. About 30-40% of the known species were collected from each area using a pair of white and yellow traps per site over a year. The numbers of species and individuals were higher in white traps than in yellow traps in both areas. Percentages of the number of species belonging to the subfamily Lepturinae in all trap catches tended to be higher than those of known Lepturinae species in all known longicorn beetle species. The number of longicorn beetle species in the Kitaibaraki area increased with forest age following cutting and was highest in an old secondary forest, as previously shown in Malaise trap catches. The number of species that depend on natural forests was lower in the Mt. Tsukuba area, suggesting that the habitat conditions of this area may not be suitable for these longicorn beetles because of the fragmented and dry condition of the forests. Thus the collision traps with attractants provide a cheap and easy method for monitoring the biodiversity of longicom beetles in forests.
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