Summary
The present investigation has been concerned with the accumulation of radionuclides by the freshwater lamellibranch Anodonta piscinalis Nilsson. Specimens of the animal were exposed for 125 days to approximately constant concentrations of the radionuclides P32, Sr89, Cs137, Ce144 and Zr95/Nb95; in addition Ru103 was included among the radionuclides for the last 55 days of the experiment. The investigation was conducted in a model recipient with environmental factors similar to those existing in the animals' biotope in nature.
The accumulation of the radionuclides was measured in the body and valves of the lamellibranch. The results indicate that an approximately constant level of radioactivity was reached after one month's exposure in these two parts of the animal. Subsequently the level of radioactivity showed a fluctuating pattern which was ascribed to seasonal and physiological changes. Accumulation of the radionuclides in the test animals varied according to the following sequence, arranged in order of decreasing affinity: P32 > Sr89 > Ce144 > Ru103 > Cs137 > Zr95/Nb95. Factors which may complicate the practical use of freshwater lamellibranchs in the monitoring of contaminated recipients are pointed out and discussed.
Zusammenfassung
Die vorliegende Untersuchung betrifft die Anhäufung von Radioisotopen bei der Lamellibranchiate Anodonta piscinalis Nilsson.
Exemplare dieses Tieres wurden beobachtet während 125 Tagen bei annähernd konstanter Konzentration der Isotopen P32, Sr89, Cs137, Ce144 und Zr95/Nb95 während 55 Tagen des Experimentes wurde Ru103 miteinbezogen.
Das Experiment wurde in einem Flussmodell durchgeführt bei gleichen Umgebungsfaktoren wie sie das Tier in seinem natürlichen Biotop findet.
Die Anhäufung der radioaktiven Isotope wurde im Körper und in der Schale der Lamellibranchiate gemessen.
Das Resultat erwies, dass innerhalb eines Monats das Tier eine gewisse Radioaktivität erreichte in den zwei geprüften Teilen. Das Radioaktivitätsniveau wies eine wellenartige Schwankung auf, welche dem Jahreszeitlichen und physiologischen Wechsel zuzuschreiben ist.
Die Radioisotope wurden im Tier in folgender Reihenfolge angehäuft: P32 > Sr89 > Ce144 > Ru103 > Cs137 > Zr95/Nb95.
Faktoren komplizierter Natur sind für den praktischen Gebrauch der Süsswasserlamellibranchiata in der Radioaktivitäts überwachung verunreinigter Gewässer begrenzend, und wurden hier diskutiert.
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This work was performed under International Atomic Energy Agency Research Contract No. 37.
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Garder, K., Skulberg, O. Radionuclide accumulation by Anodonta piscinalis Nilsson (Lamellibranchiata) in a continuous flow system. Hydrobiologia 26, 151–169 (1965). https://doi.org/10.1007/BF00142263
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DOI: https://doi.org/10.1007/BF00142263