Impact of pretilachlor herbicide and pyridaphenthion insecticide on aquatic organisms in model streams

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 insecticide were carried...

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Bibliographic Details
Published in:Ecotoxicology and environmental safety 2007-06, Vol.67 (2), p.227-239
Main Authors: Takahashi, Yoshiyuki, Houjyo, Toshihiko, Kohjimoto, Toshiki, Takagi, Yutaka, Mori, Katsuhiko, Muraoka, Tetsuro, Annoh, Hirochika, Ogiyama, Kazuhiro, Funaki, Yuki, Tanaka, Kaoru, Wada, Yutaka, Fujita, Toshikazu
Format: Article
Language:English
Subjects:
Acetanilides - toxicity
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Applied ecology
Biological and medical sciences
Cladocera
Cladocera zooplankton
Cloeon dipterum
Density reduction
Ecotoxicology, biological effects of pollution
Environmental Monitoring - methods
Eukaryota - drug effects
Fresh water ecosystems
Fundamental and applied biological sciences. Psychology
General aspects
Herbicides - toxicity
Insecticides - toxicity
Japan
Lethality
Models, Theoretical
Organothiophosphorus Compounds - toxicity
Oryza - growth & development
Phytoplankton - drug effects
Recovery
Sigara substriata
Synecology
Water Pollutants, Chemical - toxicity
Zooplankton - drug effects
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Summary: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 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.
ISSN:0147-6513
1090-2414
DOI:10.1016/j.ecoenv.2006.06.004