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Hydrobiological Journal
SJR: 0.217 SNIP: 0.575 CiteScore™: 0.24

ISSN Print: 0018-8166
ISSN Online: 1943-5991

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v37.i4.120
7 pages

Toxic Action of Organic Compounds and Heavy Metals on Epischura Baicalensis and Daphnia Magna in the Presence of Fodder Organisn

T. A. Geel
Scientific-Research Institute of Biology Irkutsk State University Irkutsk, Russia
D. I. Stom
Scientific-Research Institute of Biology Irkutsk State University Irkutsk, Russia

ABSTRACT

The toxic action of some organic compounds and heavy metals on Epischura baicalensis and Daphnia magna was studied under laboratory conditions with and without fodder organisms. On addition of algal cells (Euglena and Scenedesmus) and yeast to the medium the toxic action of the solutions of resorcinol, mannitol, and CdCl2 on Epischura baicalensis increased. In the variations without microorganisms it was essentially lower. In the presence of fodder organisms in the medium, tolerance of Epischura baicalensis for the toxic influence of the solutions of HgCl2 and CuSO4 increased. At the same time, in the presence of algae and yeast in the medium tolerance of Daphnia magna for the toxic compounds mentioned above either increased, or remained unchanged. The toxic action of organic compounds and heavy metals on Daphnia magna never increased in the presence of fodder organisms. It has been found that in the presence of algae and yeast in the medium Epischura baicalensis and Daphnia magna have different degrees of tolerance for the toxic compounds mentioned above. This fact may be accounted for by the selectivity of nutrition of Epischura baicalensis, and hence by the increased influx of toxicants in its organism as a result of the increase in the rate of filtration in the presence of fodder organisms.