Hochschule Ravensburg-Weingarten

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Autoren des Beitrags
Titel des Beitrags	Accumulation of Cs-137 by fish and aquatic plants in a small eutrophic lake
Titel veröffentlicht in ...	Book of abstracts of the International Conference on Environmental Radioactivity
Erscheinungsjahr	2017	Seite (von - bis)	p.117	Publikations-Art	Kongressschrift / Tagungsband	Name der Konferenz/Veranstaltung	International Conference on Environmental Radioactivity (ENVIRA2017)
Tagungsort	Vilnius	Tagungsdatum	01.06.2017	Inland/Ausland	Lithuania	Berichtsjahr	2017
URL :	http://envira2017.ftmc.lt/
Abstract :	Lake Vorsee, a glacially formed small and shallow eutrophic lake in Southern Germany, belongs to the areas in Germany with rather high Chernobyl fallout deposition of Cs-137 (about 30 kBq/m2). Even decades after the Cs-137 fallout considerable amounts of Cs-137 are still transported from the catchment area into the lake, and the Cs-137 activity concentration in the lake water and the transfer into aquatic plants and fish is relatively high compared with other lakes (Pröhl et al., 2006). The following measurements have been performed to describe the accumulation and transport of Cs-137 in different parts of the lake ecosystem: 1) 1987-2016: Cs-137 activity concentration in lake water and suspended matter; 2) 2013-2016: NH4+ and K+ ions competing with Cs-137 in the lake water; 3) 1987-2016: Cs-137 activity concentration in fish species (Esox lucius, Perca fluviatilis, Silurus glanis, Abramis brama, Blicca bjoerkna, Cyprinus carpio, Rutilus rutilus, Scardinius erythrophthalmus, Alburnus alburnus); 4) 2013-2016: Cs-137 activity concentration in aquatic and terrestrial plants (Myriophyllum spicatum, Nymphaea alba, Menyanthes trifoliata, Carex rostrata, Typha latifolia, Phragmites australis, Rubus fruticosus, Dryopteris carthusiana). Time dependence of Cs-137 activity concentration in lake water can be well described by a sum of two exponential functions superimposed by some seasonal cycling. The seasonal cycling of the Cs-137 activity concentration in water and its correlation with different influencing factors (competing ions concentration, weather conditions, biological activity of water plants, etc.) will be discussed. To describe the accumulation of Cs-137 in different fish species and aquatic plants a simple uptake and loss model (Smith et al., 2002) was used. Cs-137 accumulation in the trophic chain via water to non-predatory and predatory fish was observed. Estimations on the uptake and loss rate parameters for fish species from different trophic levels will be presented. Analysis of Cs-137 accumulation in fish in the last 4 years showed the decrease of Cs-137 concentration in some fish species with increasing mass. Distribution of Cs-137 concentration in the different parts of aquatic plant varies strongly for different species. Correlations with different factors influencing Cs-137 concentration in Myriophyllum spicatum (dominant plant in the lake) will be presented. This work was supported by the Federal ministry of education and research under grant 02NUK030. Pröhl, G., Ehlken, S., Fiedler, I., Kirchner, G., Klemt, E., Zibold, G. 2006. Ecological half-lives of 90Sr and 137Cs in terrestrial and aquatic ecosystems. Journal of Environmental Radioactivity 91, 4172. Smith, J.T., Kudelsky, A.V., Ryabov, I.N., Daire, S.E., Boyer, L., Blust, R.J., Fernandez, J.A., Hadderingh, R.H., Voitsekhovitch, O.V. 2002. Uptake and elimination of radiocesium in fish and the size effect. J. Environ. Radioact. 62, 145-164.
Einrichtungen	Hochschule Ravensburg-Weingarten Bachelorstudiengang Physikalische Technik Masterstudiengang Umwelt- und Verfahrenstechnik Fakultät Technologie und Management Institut für Angewandte Forschung (IAF) Schwerpunkt Energie und Umwelt (IAF) Bachelorstudiengang Energie- und Umwelttechnik
Beteiligte Personen	Klemt , Eckehard Prof. Dr. rer. nat.
Projekte	Verbundprojekt TransAqua: Transfer von Radionukliden in Aquatischen Ökosystemen; Teilprojekt I Wissenschaftliche Veröffentlichungen