アブラムシの有し型胎生雌の出現について

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タイトル別名
  • The Emergence of Winged Viviparous Female in Aphid
  • アブラムシ ノ ユウシ ガタ タイセイ メス ノ シュツゲン ニ ツイテ エイブン 8
  • VIII. Ecological Significance of the Emergence of Winged Form in the Life Cycle of Aphid
  • VIII. アブラムシの生活環における有し型出現の生態的意義

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1. In order to know if there are any differences in physiological characters between the winged and the unwinged family lines other than the hormonal relations during the first nymphal instar of the winged line as supposed by me in the 7th report of this series, some comparative observations were made on the reactions to unfavourable life conditions such as overcrowding, feeding on deteriorated food leaves and starvation in the both family lines of two species of aphids, Rhopalosiphum prunifoliae in which the winged forms are readily produced from the unwinged mothers but not from the winged, and Macrosiphum granarium in which the winged forms are easily produced not only from the unwinged but also from the winged.<br>2. In Rhopalosiphum prunifoliae, the offspring born from the winged mothers are relatively indifferent to the freshness of food and have a great resistance to starvation in their own generation. But these chatacters disappear in the second generation. In the unwinged family line, the progenies become to possess also a marked degree of resistance to the unfavourable life conditions, after they grow to the third instar, whence the wing buds become visible.<br>In Macrosiphum granarium, these phenomena can hardly be recognized.<br>3. The appearance of the winged form seems to bear certain significances in the life cycle of Rhopalosiphum prunifoliae. In this, not merely the winged forms themselves are highly resistant to external factors since the later stage of their larval development but give rise to the next generation which possesses also a marked degree of resistance to unfavourable environmental conditions. In Macrosiphum granarium, the meaning seems to be confined only to the production of the form capable of migration.

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