Spatial Distribution Pattern of Attack of the Oak Borer, Platypus quercivorus (Murayama) (Coleoptera: Platypodidae), and Scolytid Ambrosia Beetles (Coleoptera: Scolytidae) on Fresh Logs

概要

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The spatial distribution patterns of the attack on fresh logs of Pasania edti!is was studied for the oak borer. Plarypus quercivorus (Murayama), and two species of Scolytid ambrosia beetles, Xylosandrus crassiusculus (Motschulsky) and Xyleborus attenuatus Blanford, in 1994 and 1995. On the logs where only P. quercivorus attacked, the entry holes were distributed unifonrmy when attack intensity was low. However, the distribution pattern became more aggregated with the increase in attack intensity. On logs where both P. quercivorus and the two Scolytid species attacked, there was a negative association between the spatial distrlbution of the entry holes of P. quercivorus and that of scolytids. Simultaneous attack of two scolytids also increased the degree of aggregation of the entry holes of P. quercivorus . The entry holes of scolytids were distributed in groups irrespective of the attack intensity of scolytids and P. querc'ivorus. These results suggest an asymmetrical interspecific relationship between P. quercivorus and scolytids. Concentration of the entry holes of P. quercivorus in a small area may cause a considerable decline in the reproductive success in the galleries constructed there.
一般社団法人日本森林学会の論文
1998-11-16