シマミミズEisenia foetida (SAVIGNY)で觀察した異樣なる行動2題 : 木立への木登りと旋回匍匐運動
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概要
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the following two kinds of observation were done in nature in Eisenia foetida. 1. Climbing on a vertical trunk of tree In the morning following rainy night, the worms found on the vertical trnk of the tree, Paulownia tomentosa (Fig.1), were creeping downward (Fig.2). The animals had apparently climbed up the rain-wetted bark in the night. The writer had chances to observe this peculiar behavior four times in 6 specimens as follows: No. Date Time of observation Height from the ground when observed(m) Length of the worm(cm) 1 [table] At the time of observation the maximum height reached by the worms was about 5 meters. This height cannot be regarded as the maximum one attainable by them, because the animals were already on the way downward. The writer found also a specimen on an upright board-fence in a similar weather condition. 2. Circus movement This was observed in the morning of March 13, 1932, following rainy night. On the thoroughly wet ground, a specimen was found creeping along a spiral course by a sort of circus movement. Judging from its speed and the whole length of the track already impressed on the ground, the animal might have started this peculiar course at 7h or 7h30m a.m. It was still going on at 9h30m, when the writer had to cease the observation. The track began at A (Fig.3) and ran through B to C. The worm is shown at W. The direction of the general displacement was from north to south, while that of the spiral movement consistenty left-handed. The diameters of the circles were measured 11.5cm and 4.5cm in two extreme cases. The length of the worm was 7.5cm. The nature or the cause of this movement was not clear. In appearance it resemles the behavior experimentally induced in some lepidopterous larvae (HAYASHI).
- 1936-10-15