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  • 1 Institute for Environmental Sciences Ienomae 1-7, Rokkasho-mura, Kamikita-gun Department of Radioecology Aomori-ken 039-3212 Japan
  • 2 University of Shiga Prefecture Yasaka-cho Limnological Laboratory, School of Environmental Science 3165 Hikone-shi Shiga-ken 522-0057 Japan
  • 3 Shimane University Nishikawatsu-cho Department of Material Science, Faculty of Science and Engineering 1060 Matsue-shi Shimane-ken 090-8504 Japan
  • 4 Institute for Environmental Sciences Rokkasho Department of Radioecology Aomori 039-3212 Japan
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Lake Obuchi is on the Shimokita Peninsula, Aomori Prefecture, Japan, near several nuclear fuel-related facilities. The lake contains from oligohaline to polyhaline regions, and the salinity fluctuates greatly both spatially and temporally. This study examined the possible effect of salinity on biological concentrations of 137Cs in phytoplankton on the basis of a culture experiment using stable Cs and phytoplankton species isolated from the lake. In both Cyclotellaand Skeletonema, the biological concentrations of Cs varied with salinity conditions, and a positive linear relation was found between maximum proliferation and biological concentrations of Cs.