Volume 40, May 2005ECORAD 2004
|Page(s)||S913 - S919|
|Published online||17 June 2005|
Model ecosystem approach to estimate community level effects of radiation
Center for Radiation Safety, National Institute of Radiological Sciences, 4-9-1, Anagawa, Inage Chiba 263-8555, Japan
2 Center for Ecological Research, Kyoto University, Hirano-cho, Otsu, Shiga, Japan
Mathematical computer model is developed to simulate the population dynamics and dynamic mass budgets of the microbial community realized as a self sustainable aquatic ecological system in the tube. Autotroph algae, heterotroph protozoa and saprotroph bacteria live symbiotically with interspecies' interactions as predator-prey relationship, competition for the common resource, autolysis of detritus and detritus-grazing food chain, etc. The simulation model is the individual-based parallel model, built in the demographic stochasticity, environmental stochasticity by dividing the aquatic environment into patches. Validity of the model is checked by the multifaceted data of the microcosm experiments. In the analysis, intrinsic parameters of umbrella endpoint regarding to lethality are manipulated at the individual level, and tried to find the population level, community level especially focused on predator-prey relationship, and revealed the indirect effect of chronic exposure of radiation on the probability of Tetrahymena's extinction.
© EDP Sciences, 2005
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