The Combined Effect of Ecological Factors on Freshwater Zooplankton Community under Toxicant Stress

Yury A Noskov; Yury A Yurchenko; Saskia Knillmann; Nathalie C Stampfli; Mikhail A Beketov; Matthias Liess; Olga E Belevich
It is well known that environmental factors can affect toxicants impact on ecosystems (Clements, Newman, 2002). However, the estimation of pesticides toxicity most often bases on the results of standard toxicity tests, which include some suitable species of aquatic organisms (Organisation, 2000; Methods, 2000).Laboratory and semi-field investigations with different species are required for appropriate assessment and prediction of pesticides effects on non-target organisms. To understand the influence of combined effect of biotic and abiotic factors on pesticides toxicity, a semi-field experiment with outdoor microcosms has been conducted in Western Siberia (Karasuk, Russia) and in Central Europe (Leipzig, Germany). The effect of pyrethroid in secticide esfenvalerate (0.03, 0.3 and 3 µg/L) on freshwater communities under regulation of ecological factors was evaluated. We studied combined effects of two factors – both shading and low density of invertebrates. Abiotic factors (i.e. temperature, conductivity, insolation level) significantly vary in the shaded and unshaded ponds, as well as pH differing (p<0.05) in the ponds with and without harvesting.
Ecological Factors,Toxicant Stress,Freshwater Zooplankton Community ,
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