| Autor: |
Soné, Koichi, Mori, Takeshi, Ide, Masamichi |
| Zdroj: |
Journal of Forest Research; November 1998, Vol. 3 Issue: 4 p225-229, 5p |
| Abstrakt: |
The spatial distribution patterns of the attack on fresh logs ofPasania eduliswas studied for the oak borer,Platypus quercivorus(Murayama), and two species of Scolytid ambrosia beetles,Xylosandrus crassiusculus(Motschulsky) andXyleborus attenuatusBlanford, in 1994 and 1995. On the logs where onlyP. quercivorusattacked, the entry holes were distributed uniformly when attack intensity was low. However, the distribution pattern became more aggregated with the increase in attack intensity. On logs where bothP. quercivorusand the two Scolytid species attacked, there was a negative association between the spatial distribution of the entry holes ofP. quercivorusand that of scolytids. Simultaneous attack of two scolytids also increased the degree of aggregation of the entry holes ofP. quercivorus. The entry holes of scolytids were distributed in groups irrespective of the attack intensity of scolytids andP. quercivorus. These results suggest an asymmetrical interspecific relationship betweenP. quercivorusand scolytids. Concentration of the entry holes ofP. quercivorusin a small area may cause a considerable decline in the reproductive success in the galleries constructed there. |
| Databáze: |
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