マツカレハ個体群の潜伏発生期における環境抵抗の実験的解析

DOI Web Site 被引用文献5件
  • 古田 公人
    京都大学農学部昆虫学研究室 農林省林業試験場保護部昆虫科

書誌事項

タイトル別名
  • The Relationship between Population Density and Mortality in the Range of Latency of <i>Dendrolimus spectabilis</i> BUTLER
  • マツカレハ コタイグン ノ センプク ハッセイキ ニ オケル カンキョウ テイコウ ノ ジッケンテキ カイセキ

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抄録

Eggs and larve of D. spectabilis were artificially placed on pine trees and their survival was observed at two experimental stations, Momoyama and Sumiyoshiyama, in Kyoto. At Momoyama natural infestation by this insect was seen. At Sumiyoshiyama no natural population occurred. At Momoyama about 0.9% of the eggs released emerged as adults. During the late larval instars the mortality was caused by some density-dependent factors. Predation by Polistes japonica and dispersal were noticed as these factors. At Sumiyoshiyama the population, placed artificially by the experimentor, died out on the larval stage. In spite of the final extermination of the population, some density dependence was suggested by the different rates of mortality between high- and low-density populations. Only the predation by ants and mantises on hatching larvae was observed as mortality factors. These were observed only when the density was high.

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