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Comparative investigation on the effect of a herbicide on aquatic organisms in single species tests and aquatic microcosms

: Traunspurger, W.; Schäfer, H.; Remde, A.


Chemosphere 33 (1996), Nr.6, S.1129-1142
ISSN: 0045-6535
ISSN: 0366-7111
Fraunhofer IUCT ( IME) ()
dediment organism; freshwater organism; herbicide isoproturon; microcosmstudy; single species test

In the present investigation the effect of the herbicide isoproturon on freshwater and sediment organisms was comparatively investigated in single species tests and a microcosm study. In single species tests the photosynthesis inhibitor isoproturon affected the growth rate of algae. For Chlamydomonas rheinhardi the EC50; i.e. the concentration, where the growth rate is inhibited to 50 per cent, was observed at 40 mu g/l. The growth rate of the ciliate Tetrahymena pyriformis was slightly inhibited at 700 mu g/l, whereas other heterotrophic organisms (Daphnia magna and the nematode Caenorhabditis elegans) were not affected by isoproturon up to concentrations of 1000 mu g/l. In the microcosm study application of isoproturon to the microcosms up to a concentration of 90 mu g/l neither affected the abundance nor the community composition of the phytoplankton, the zooplankton and the sediment dwelling nematodes. However, there was a distinct effect on anaerobic microbial degradation activity in the sediment.