Add time:08/27/2019         Source:sciencedirect.com

To detect the impact of pesticides on aquatic organisms, model streams (3 m wide, 20 m long) were established in paddy field in Japan. More than 100 species of aquatic organisms were generated in the model streams. Field tests with pretilachlor herbicide and Pyridaphenthion (cas 119-12-0) insecticide were carried out in the streams for 3 yr (2001–2003). Exposure of pretilachlor (max. 0.382 mg/L) showed little density changes in algae with a Bray–Curtis percent similarity in the range 81.6–93.3% for algae. Exposure to high concentrations (>0.1 mg/L) of pyridaphenthion produced visible density reductions in Cladocera zooplankton species. Reduction of individual aquatic insects in the model streams by pyridaphenthion caused an increase of chlorophyll a greater than that of the control streams. The pesticides used showed no substantial differences in the ecosystems of model streams exposed to maximum environmental concentrations (e.g., 0.01 mg/L) detected in real rivers.

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