カマドコオロギにおける翅の多型

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概要

• 論文の詳細を見る

• Three wing-forms were seen in the cricket, Gryllodes sigillatus WALKER, when the larvae were reared under different densities and temperatures. Almost all individuals reared solitarily became the micropterous form and the ones reared in groups the micropterous or macropterous forms in both sexes. A few incidences of the median form was seen in female. The incidence of macropterous form increased as the larval density increased and temperature rose. It was suggested from the experiment in which the larval density was changed at the sixth instar that the wing-form is determined mainly by the fifth instar. The difference in body size and shape among the wing-forms was discussed based upon the principal component analysis on six characters (five measurements of body parts and body weight). It was shown that the length of the pronotum was shorter in the macropterous than in the micropterous and median forms. The body size became smaller as the larval density increased, and varied in relation with the rearing density. The body size of the female micropterous form is more strongly influenced by the density than the macropterous form : The body size of the female micropterous obtained from five larvae rearing was greater than that of the macropterous form obtained under the same condition, but that of the micropterous form obtained from ten larvae rearing was smaller than that of the macropterous form. The body size seemed to be influenced mainly in old larval stage. It is, therefore, suggested that the incidence of the wing-form and body size, both of which are affected by the larval density, are independent to each other. The days of larval development and the fecundity were not different significantly among the wing-forms. The shape of the oviposion curve shows that the maturity of the ovary in the adult is faster in the micropterous than in the macropterous and median forms. It is concluded from the facts mentioned above that the wing-form in G. sigillatus is a phenomenon similar to the phase in locusts and other insects.

• 日本生態学会の論文

著者

• 中村 和雄

  農林省農業技術研究所

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• クリタマバチの個体群動態に関する研究 : 第1報 調査区の記載およびクリタマバチとその寄生バチの生活史
• カマドコオロギにおける翅の多型

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