ショウジョウバエの幼虫棲息密度と羽化状態及び成虫體長の關係

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1. Various numbers (1, 3, 5, 25, 50, 75, 100, 150, 200, 240, 280 and 330 individuals) of Ist inster larvae of Drosophila melanogaster were placed in the small glass vessels (diameter 3.7 cm, height 8 cm), each containing 12 cc of food materials made of kodi, and the numbers of emerging adults were counted daily with measuring their body lengths. 2. The mortality was smallest when 3 individuals were placed in the vessel, and when populations were smaller or larger than this the mortalities were always larger (Fig. 1). 3. Body lengths of adult male changed in reciprocal correlation with the logarithms of population numbers. Those of adult female, when more than 5 individuals were placed in the vessels, changed as in the case of the male; but when populations were less than 5 individuals no significant differences were seen (Fig. 2). 4. Ranges of days from the beginning to the end of emergence of flies in a certain vessel became longer in accord with the population densities grew greater, and the interaction among larvae was responsible (at least partly) for this phenomenon (Fig. 3). 5. Body lengths of adult flies from a certain vessel varied day after day through the course of emergence. When the populations were smaller than 150 individuals, those emerging at the first day were generally the largest of all and with the progress of days the lengths became smaller. Although, when populations were greater than 240 individuals, those emerging at the first few days as well as at the last few days were larger than those emerging at the middle part of the course (Fig. 4). This phenomenon is supposed to be related to the fact that the competition among larvae may take place most seriously among individuals of similar developmental stages.
社団法人日本動物学会の論文
1951-05-15

ショウジョウバエの幼虫棲息密度と羽化状態及び成虫體長の關係

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