ユリミミズの水中土表面における出現とその活動状況について
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概要
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There are several species of earthworms injuring the growth of the rice plant in the nursery bed and the paddy field, but few studies concerning the injurious feature have been made. In the Hokuriku district in Japan where the paddy field cannot be drained or poorly drained of the water, the damage by the injurious earthworm is one of the serious problems on the rice plant cultivation. Therefore, to make a contribution to the control of these injurious earthworms, the author has attempted to investigate the seasonal prevalence of Limnodrilus gotoi HATAI which is distributed widely in this district. A large number of worms reared in a concrete-frame was used. And the total number of worms and the active individuals which appeared on the bottom of the water were observed at the intervals of 5 or 10 days from April to November of 1959,and also the water and soil temperatures were measured. The results obtained are : 1. At the end of April, a dense population of active worms is observed at the bottom of the water, but their number decreases gradually toward the end of June and the beginning of July. The dense population appears again in the middle of July, but they tend to decrease till the beginning of October. Afterwards, the worms become dense from the end of October to the end of November. 2. It was ascertained that a positive correlation was recognized between the total number of worms and the active individuals. 3. It is considered that the swinging activity at the bottom of the water is influenced by the water temperature and the soil temperature. From late April to the beginning of June and in the middle and late October, the active swinging is observed at 20〜21℃ of the soil temperature and at 22℃ of the water temperature. But, in summer the most active swinging is observed at the temperature higher than the above. From these results, it seems that the swinging movement in the former case is the normal action under the favourable conditions, but that in the latter case is the abnormal and rather desperating action caused by the high temperature. 4. The irregular daily change is seen in the total number of individuals which appeares on the soil surface at the bottom of the water. The main factor relating to the above seems to be such thermal factor as the soil temperature or the water temperature.
- 1961-02-01
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関連論文
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