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Influence of selected fluorescent dyes on small aquatic organisms

Rowiński P.M., Chrzanowski M.M.

Acta Geophysica

2011

Vol. 59, no. 1

91-109

Rhodamine B and Rhodamine WT are fluorescent dyes commonly used as tracers in hydrological investigations. Since introducing intensely red substances into rivers raises understandable doubts of ecological nature, the authors aimed at examining the influence of these dyes on small water fauna using bioindication methods. Quantitative results, calculated with the use of Bliss-Weber probit statistical method, were achieved by means of standardized ecotoxicological tests containing ready-to-hatch resting forms of fairy shrimp (Thamnocephalus platyurus). Qualitative studies included observation of water flea crustacean (Daphnia magna) and horned planorbis snail (Planorbis corneus), both typically present in rivers and representative for temperate climate, as well as guppy fish (Poecilla reticulata), paramecium protozoan (Paramaecium caudatum) and the above-mentioned fairy shrimp. The investigation revealed that both dyes in concentrations used for hydrological purposes are low enough to exert almost no toxic impact on water fauna considered.

Wpływ pestycydów (fenitrotion, tolylfluanid) na Daphnia magna na podstawie testów toksyczności ostrej

Frąk M., Wiśniewska M.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2005

Vol. 14, No. 2

167--176

Acute toxicity of two pesticides (organophosphorous insecticide and fungicide from sulfamid group) on Daphnia magna was studied in this experiment. Mortality of examined organisms in different concentrations of these active substances was defined. The value of lethal concentration (LC50) was calculated using probit method based on the observation results. The results have shown that after 6-hour exposure fenitrotione is more toxic for Daphnia magna, however after 24- and 48-hour exposure tolylfluanide occured more toxic. Both substances are very hazardous and toxic for aquatic organisms.