Research Abstract


Biological proliferation of cesium-137 through the detrital food chain in a forest ecosystem in Japan

2014年1月8日 Scientific Reports 4 : 3599 doi: 10.1038/srep03599


村上 正志1, 大手 信人2, 鈴木 隆央1, 石井 伸昌3, 五十嵐 祥晃1 & 田野井 慶太郎2

  1. 千葉大学大学院 理学研究科 群集生態学研究室
  2. 東京大学大学院 農学生命科学研究科
  3. 放射線医学総合研究所 放射線防護研究センター
Radionuclides, including 137Cs, were released from the disabled Fukushima Daiichi Nuclear Power Plant and had been deposited broadly over forested areas of north-eastern Honshu Island, Japan. In the forest, 137Cs was highly concentrated on leaf litters deposited in autumn 2010, before the accident. Monitoring of the distribution of 137Cs among functional groups clearly showed the role of the detrital food chain as the primary channel of 137Cs transfer to consumer organisms. Although many studies have reported the bioaccumulation (or dilution) of radioactive materials through trophic interactions, the present results highlight the importance of examining multiple possible pathways (e.g., grazing vs. detrital chains) in the proliferation of 137Cs through food webs. These results provide important insight into the future distribution and transfer of 137Cs within forest ecosystems.