Skip to main content Accessibility help
×
Home

Mathematical model approach to understand the ecological effect under chronic irradiation

  • J. Barescut, D. Lariviere, T. Stocki, I. Kawaguchi (a1), M. Doi (a1) and S. Fuma (a1)...

Abstract

Although aim of the environmental protection is conservation of ecosystem, there are only a few studies focusing on the effect of radiation on ecosystem. To understand the ecological effect of irradiation, microbial ecosystem, “microcosm”, which contains minimum components of ecosystem such as producer, consumer and decomposer, is useful because the natural ecosystem is too complex. The microcosm consists of three species, i.e. Euglena (producer), Tetrahymena (consumer), and E. coli (decomposer). The mathematical model and computer simulation model were also developed to understand the mechanism of ecological interaction using the results of acute exposure experiments of the microcosm, and we predicted Tetrahymena, which is the most radio-resistant among the constituent species, would be most sensitive in the chronically irradiated microcosm as a result of an indirect effect due to population decrease in E. coli. Recently we started chronic exposure experiments. The microcosms were irradiated with γ-rays at dose rate of 1.2Gy/day, 5Gy/day, 10Gy/day and 23Gy/day. From preliminary results, we found that the prediction from the models was different from the experimental results. Therefore, in this study, we improved our mathematical model and discuss the difference between the model and experiments.

Copyright

References

Hide All
[1][1]Kawabata, Z., Matsui, K., Okazaki, K., Nasu, M., Nakano, N., Sugai, T. (1995), J. Protozool. Research, 5, 23–26.
[2][2]Fuma, S., Takeda, H., Miyamoto, K., Yanagisawa, K., Inoue, Y., Sato, N., Hirano, M., Kawabata, Z. (1998), Effects of γ-rays on the populations of the steady-state ecological microcosm, Int.J.Radiation biology, 74, 145–150.
[3][3]Fuma, S., Takeda, H., Miyamoto, K., Yanagisawa, K., Inoue, Y., Ishii, N., Sugai, K., Ishii, C., Kawabata, Z. (2001), Ecological evaluation of gadolinium toxicity compared with other heavy metals using an aquatic microcosm. Bulletin. Environmental Cont. and Toxicol., 66, 231–238.
[4][4]Fuma, S., Ishii, N., Takeda, H., Miyamoto, K., Yanagisawa, K., Ichimasa, Y., Saito, M., Kawabata, Z., Polikarpov, G.G. (2003), Ecological effects of various toxic agents on the aquatic microcosm in comparison with acute ionizing radiation. J. Environmental Radioactivity, 67, 1–14.
[5][5]Shikano, S., Kawabata, Z. (2000), Effect at the ecosystem level of elevated atmospheric CO2 in an aquatic microcosm. Hydrobiologia, 436, 209–216.
[6][6]Doi, M., and Kawaguchi, I. (2007), Ecological impacts of umbrella effects of radiation on the individual members. J. Environmental Radioactivity, 96, 32–38.
[7][7]Doi, M., Kawaguchi, I., Tanaka, N., Fuma, S., Ishii, N., Miyamoto, K., Takeda, H., Kawabata, Z. (2005), Model ecosystem approach to estimate community level effects of radiation. Radioprotection, Suppl. 1, 40, S913–S919.
[8][8]Fuma, S., Kawaguchi, I., Kubota, Y., Yoshida, S. Kawabata Z., and Polikarpov, G.G. Effects of chronic γ-irradiation on the aquatic microbial microcosm, submitted.
[9][9]Shikano S., Luckinbill L.S., and Kurihara Y. (1990) Changes of traits in a bacterial population associated with protozal predation. Micro. Ecol. 20, 75–84.
[10][10]Nakajima, T. and Kurihara, Y., (1994) Evolutionary changes of ecological traits of bacterial populations through predator-mediated competition., Oikos, 71, 24–34.

Mathematical model approach to understand the ecological effect under chronic irradiation

  • J. Barescut, D. Lariviere, T. Stocki, I. Kawaguchi (a1), M. Doi (a1) and S. Fuma (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed