マツノキハバチに関する生態学的研究 : I.幼虫の集合効果と集合形態について

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概要

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• Larvae of Neodiprion sertifer (GEOFFROY) live in compact aggregation throughout their larval period. Larvae were reared in different group sizes to evaluate the aggregation effects on the larval mortality, the larval development and the weight of cocoons. Laboratory experiments and observations of natural larval groups were conducted to define the characteristics of larval aggregation. The durations of the first and second instars were much longer in the isolated rearings than in the group ones. There was no difference in the weight of cocoons among all the rearing groups. The survival rates were 55-66% in the rearing groups with 1,2,3 and 5 larvae, and 77% in those with 7 larvae. Larvae in the rearing groups comprising 10 and 20 individuals seldom died. The mortality of larvae which were reared on dry needles became higher with the decrease in the group size. The values of m which were calculated on the basis of the number of larvae per one needle for natural groups became smaller at feeding time and higher at moulting time. It was observed that at feeding time several larvae formed a small group at the feeding site on each needle and at moulting time many larvae moved to the lower part of needle and formed a tight aggregation there. It was found that aggregation of N.sertifer involved two types, i.e., "feeding group" which was composed of several larvae per one needle at feeding time and "moulting group" which was formed by many larvae at moulting time. The ecological significance of these two types of larval aggregation were discussed.

• 日本応用動物昆虫学会の論文
• 1980-08-25

著者

• 中村 寛志

  上戸学園女子短大

• 中村 寛志

  上戸学園女子短期大学

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• マツノキハバチに関する生態学的研究 : III.幼虫集団の空間分布様式
• マツノキハバチに関する生態学的研究 : II.集団サイズと死亡率・死亡要因の関係について
• マツノキハバチに関する生態学的研究 : I.幼虫の集合効果と集合形態について

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