Impacts of Fukushima Nuclear Accident on Freshwater Environments

1 Introduction.- Part 1 Rivers and lake environment.- 2 Migration behavior of radiocesium released from the Fukushima accident in Japanese river systems during six months after the accident.- 3 Spatial and temporal fluctuations of nuclear accident-derived 137Cs and 3H concentration in river waters in eastern Fukushima, Japan.- 4 Spatial and temporal changes of 137Cs concentrations in river waters and the relations with the radiocesium inventory in Fukushima and adjacent areas.- 5 Inflow/ outflow of radiocesium in a dam lake and its accumulation on lake bottom.- 6 Record of income and outgo of radioactive cesium in lake Cyuzenji.- Part 2 Ecosystem.- 7 Relationship between air dose rate and 137Cs concentration of the fish in mountain streams in Fukushima Prefecture.- 8 Annual changes of 137Cs concentrations in freshwater fishes.- 9 Radiocesium concentrations in brown trout in Lake Chuzenji after the Fukushima Daiichi Nuclear Power Plant accident.- 10 Body size effect of radiocesium for wakasagi (Hypomesus nipponensis).-  11 Variations in 134+137Cs radioactivity level of suspended particulate matter in streams and its respond to aquatic insect after FDNP accident.- 12 A review of radioactive contamination in a freshwater ecosystem in Nikko area, Japan (tentative).- Part 3 Case studies at different watershed environments.- 13 The dynamics of radiocesium in the lake ecosystem of lake Onuma on Mt. Akagi.- 14 Radiocesium transfer from forest catchment to freshwater fish living in mountain streams estimated from environmental monitoring data in Fukushima Prefecture.  

Seiya Nagao is a Professor and the Director, Institute of Nature and Environmental Technology (K-INET), Kanazawa University, Japan. Main topic of the K-INET focuses on transboundary pollution via atmosphere and ocean at East Asia under the Joint-Usage/Research program organized by the Ministry of Education, Culture, Sports, Science and Technology, Japan. His carrier has positions in institution and academia, including Japan Atomic Energy Research Institute (present: Japan Atomic Energy Agency), Hokkaido University and Kanazawa University. His research interests are fate of organic matter and radionuclides in aquatic environments. He also interests integrated environmental studies at atmosphere-land-coastal ocean, based on migration behavior of geo-materials.