家蚕における集合性行動の研究

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タイトル別名
  • Studies on Aggregative Behaviour of the Silk-worm, <i>Bombyx mori</i> L.
  • カサン ニ オケル シュウゴウセイ コウドウ ノ ケンキュウ 1
  • I. On Behaviour Patterns in a Certain Period
  • 第1報 一定時間内の行動様式について

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In order to affirm the existence of an aggregative behaviour of the silk-worm in a certain period, an experiment was carried out. The silk-worms used in summer of 1961 and 1962 were Shi-124×Nichi-124, in autumn of 1961 (2:4)×(5:4), and in spring of 1962 Gimpaku×Zuiko. These strains have been used widely. for breeding in the sericultural industry in Japan.<br>The observation was made on the silk-worms, which initially were placed separately in a space with aframe; movement of individuals was observed and the number of solitary ones was recorded every five minutes for an hour. The ratio of the number of solitary individuals at the end of the one-hour observation ranges 11 to 31 per cent. This shows aggregative rates of the worm were 69 to 89 per cent. In the first thirty minutes, the number of the solitary individuals rapidly decreased, and contact or approach by two individuals occurred.<br>Finally some large groups containing four to six individuals were formed which, however, showed no further development. If an individual came in contact with other individuals, swinging movement of the first two body segments became less remarkable and the worm became almost immobile.<br>The peculiar character in aggregation of the silk-worm described above was observed regardless of seasons or instars. Younger individuals were more active than older ones; former fell into aggregation more rapidly, but the dispersion was even more rapid and oftener than latter.<br>Thus, an individual, continuing the trial and error movement, gets a chance klinotaxically to contact and approach each other and is led to an aggregation. From the present results an existence of the aggregative behaviour of the silk-worm is recognized.

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