ハマダンゴムシTylos granulatus MIERSの日週期活動 : III.発育にともなう週期活動の変化

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概要

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• The animal, Tylos granulatus MIERS, and inhabitant of the sea-shore sand-dune, shows conspicuous daily rhythmic activity. It inhabits beneath the sea-shore sand-dune in the daytime and is active only during the night under natural conditions. The present paper states the results of some experimental observations on the modification of rhythmic activity in accord with its growing stage. Experimental observations were made with animals which were kept in the laboratory during May to June, 1952. I. Modifications in the mode of rhythmic activity in accord with growing stage of animal are shown as follows : a. The rhythmic activity of the youngest stage (with 5mm body length) belongs to dependent type of activity through 24 hours periods (Fig. 2). b. The younger one (with 10-15mm body length) is active only in the night and did not show any activity in the daytime, so the rhythmic activity in 24 hours periods belongs to independent type of rhythmic activity. But, in the night, activity of the animal are influenced with some environmental factors, such as, airtemperature, relative humidity and etc., so the nocturnal activity of the animal belongs to dependent type of rhythmic activity through 10 hours in the night. c. When the animal grows up (with 20mm body length), it shows typical independent type of rhythmic activity in 24 hours periods (Fig. 2). II. In spite of growing stage, the animal is always active in the night, and the animal shows the most sever activity in the same time, these phenomena are characterized the daily rhythmic activity of this animal (Fig. 2). III. MORI ('50) stated that daily rhythmic activity of a certain specles established not only by the combinations of mutations and natural selections, but also by directed and gradually accumulated modifications, and in my opinion, the daily rhythmic activity of this animal seems to have established by also the same process, from the results are shown in Figs. 1,2. On the other hand, the diurnal rhythm of this animal, is essentially a metabolic cycle synchronized with the external periodicity of day and night through the influence of variations in illumination, temperature and other environmental factors, on the nervous and endocrine systems, as stated by KLEITMAN

• 1954-05-25

著者

• 恩藤 芳典

  鳥取大学学芸学部生物教室

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• ハマダンゴムシTylos granulatus MIERSの日週期活動 : V.波の運動に伴う週期活動に関係する生理条件の解析
• ハマダンゴムシTylos granulatus MIERSの日週期活動 : III.発育にともなう週期活動の変化
• フナムシ Megaligla exotica(Roux)の週期活動 : II. 群れをなしての週期移動と体内生理要因及び潮汐週期との関連

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