@article{oai:repo.qst.go.jp:00043077,
 author = {Fuma, Shoichi and Ishii, Nobuyoshi and Takeda, Hiroshi and Miyamoto, Kiriko and Yanagisawa, Kei and Ichimasa, Yusuke and Saitou, Masahiro and Kawabata, Zenichiro and Polikarpov, Gennady and 府馬 正一 and 石井 伸昌 and 武田 洋 and 宮本 霧子 and 柳澤 啓 and 一政 祐輔 and 齊藤 眞弘},
 journal = {Journal of Environmental Radioactivity},
 month = {},
 note = {The purpose of this study was an evaluation of the effect levels of various toxic agents compared with ionizing radiation for the experimental model ecosystem, i.e., microcosm mimicking aquatic microbial communities. For this purpose, the authors used the microcosm consisting of populations of the flagellate alga Euglena gracilis as a producer, the ciliate protozoan Tetrahymena thermophila as a consumer and the bacterium Escherichia coli as a decomposer. Effects of aluminum and copper on the microcosm were investigated in this study, while effects of g-rays, ultraviolet radiation, acidification, manganese, nickel and gadolinium were reported in the previous studies, respectively. The microcosm could detect not only the direct effects of these agents but also the community-level effects due to the interspecies interactions or the interactions between organisms and toxic agents. The authors evaluated doses or concentrations of each toxic agent which had the following effects on the microcosm: (1) no effects; (2) recognizable effects, i.e., decrease or increase in the cell densities of at least one species; (3) severe effects, i.e., extinction of one or two species; and (4) destructive effects, i.e., extinction of all species. The resulting effects data will contribute to an ecological risk assessment of the toxic agents compared with ionizing radiation.},
 pages = {1--14},
 title = {Ecological effects of various toxic agents on the aquatic microcosm in comparison with acute ionizing radiation},
 volume = {67},
 year = {2003}
}