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タイトル別名
  • STUDY ON THE DENSITY EFFECT OF THE ADULT OF THE BROWN PLANTHOPPER, Nilaparvata lugens STAL
  • トビイロウンカ セイチュウ ノ ミツド コウカ ニ ツイテ

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抄録

Difference in the density effect between the two wing-forms, brachypterous and macropterous adults of the brown planthopper, Nilaparvata lugens STAL were studied. 1. The number of eggs per individual was affected both in brachypterous and macropterous forms by the difference of population densities, As density in test tube became high, the number of eggs deposited decreased in the macropterous form more than in the brachypterous form. 2. Average pre-oviposition periods in the two forms decreased as the density became high. The trend of decrease of in the brachypterous form did not appear in low density such as 1 or 2 pairs in the test tube. 3. Longevity of the macropterous form became short toward high density, contrary to that of the brachypterous form. 4. Distribution of two wing-forms on the rice seedlings was affected by density. As density became high, the macropterous form was distributed on the higher parts of the rice seedling or of the inner wall of the test tube and moved more actively. Brachypterous form more or less tended to be distributed throughout rice seedling. As density became high, it rather moved less actively. Those analyses of density effects showed that the interaction of the individuals was more important than space for solving the mechanism of density of the adults of brown planthopper.

収録刊行物

  • 日本生態学会誌

    日本生態学会誌 17 (6), 230-233, 1967

    一般社団法人 日本生態学会

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