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Predicting ecological and evolutionary responses of planktonic populations to chronic radionuclide exposure inducing different toxic effects on organisms


Congress title :International Conference on Radioecology and Environmental Radioactivity 
Congress date :15/06/2008

Document type > *Congrès/colloque

Keywords >

Research Unit > IRSN/DEI/SECRE/LME

Authors > ALONZO Frédéric, GARNIER-LAPLACE Jacqueline, GILBIN Rodolphe, MASSARIN Sandrine, ZEMAN Florence

Publication Date > 20/06/2008

Summary

  Assessing the ecological risk of radioactive substances requires evaluation of effects of acute and chronic exposure to ionising radiation in representative wildlife species. In this aim, a series of experiments was conducted in recent years with the microcrustacean Daphnia magna (Alonzo et al. 2006, 2008a; Gilbin et al., 2008; Zeman et al., 2008). This species is widely-used for investigating toxicity of contaminants in freshwater invertebrates.
Laboratory experiments demonstrated that chronic exposure of daphnids to natural uranium (U), 241americium (Am-241), and 137caesium (Cs-137) caused different perturbations in survival, reproduction, and several other vital functions of organisms (nutrition, respiration, growth and storage of energy reserves). However, these observations were made in laboratory conditions on an individual level, whereas their consequences in a broader ecological context are poorly documented.
In this study, we simulate potential changes in population dynamics in relation to radionuclide effects observed experimentally at the individual level, in order to improve the ecological relevance for risk assessment.
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