Mortality of the Earthworms, Eisenia foetida, after γ-irradiation at Different Stages of Their Life History
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Effects of ionizing radiation on the earthworm, Eisenia foetida, were investigated by means of mortality, growth inhibition and hatchability of the eggs. Adult earthworms were resistant to ^<137>Cs γ-irradiation, LD_<50> (30 days) value being about 65 kR. Young earthworms were less resistant than adult ones. Their growth was completely inhibited by 10 kR of γ-irradiation, but 2 kR did not affect them at all. Embryos at early developmental stages showed high mortality by γ-irradiation and as development proceeded their resistance to irradiation increased. Mature earthworms were irradiated and the hatchability of the cocoons laid by them after irradiation was examined. Hatchability of the cocoons laid within 5 days after irradiation with 2 kR was scarcely affected. Then the hatchability decreased with the interval between irradiation and laying, and reached lowest level 20 days after irradiation. From 20 days after irradiation, it started to recover and reached the control level 30 days after irradiation.
- 日本放射線影響学会の論文
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