Effects on Ecosystem
ＱIs there any increase in the number of mutations caused by radiation among wildlife in Fukushima prefecture?
ＡNational Institute for Environmental Studies developed a plant and cultured cells in which the scars in DNA caused by radiation can be observed. Experiments using these cultured cells showed that no concern is warranted regarding increased mutations in wildlife DNA in 99.5％ of the difficult-to-return zones as of October 2016.
- Organisms have a mechanism to repair damaged DNA. Mutation appears when balance is lost between the amounts of DNA damage and DNA repair.
- Double-strand damage caused by radiation is repaired through homologous recombination repair (Fig.1).
- We investigated the balance between the amounts of DNA damage and repair using cultured cells derived from this plant to find that the amount of repair outpaced damage at 16 µSv/h (Fig. 3). This means that no increase in wildlife DNA mutation occurred in 99.5％ of difficult-to-return zones (Fig.4).
- How have ecosystems changed in evacuation-order zones?
- What is the current concentration of radioactive cesium in edible wild plants in Fukushima Prefecture?
- Does the concentration of radioactive cesium deposited in mountain forests vary by altitude and location?
- How does the concentration of radioactive cesium in trees change with time? Is radioactive cesium gradually absorbed into trees from roots?
- Is there a continuous input of cesium contamination to rivers from forests?