Influence of selected water quality characteristics on the toxicity of lambda-cyhalothrin and gamma-cyhalothrin to Hyalella azteca.
This study was conducted to assess the influence of suspended solids, dissolved organic carbon, and phytoplankton (as chlorophyll a) water quality characteristics on lambda-cyhalothrin and gamma-cyhalothrin aqueous toxicity to Hyalella azteca using natural water from 12 ponds and lakes in Mississippi, USA with varying water quality characteristics. H. azteca 48-h immobilization EC50 values ranged from 1.4 to 15.7 ng/L and 0.6 to 13.4 ng/L for lambda-cyhalothrin and gamma-cyhalothrin, respectively. For both pyrethroids, EC50 values linearly increased as turbidity, suspended solids, dissolved organic carbon and chlorophyll a concentrations increased.
Water Quality and Ecology Research Unit, USDA-ARS National Sedimentation Laboratory, 598 McElroy Drive, Oxford, MS 38655, USA. ssmith@ars.usda.gov
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D033304:Amphipoda / Q000187:drug effects*; D000818:Animals; D007306:Insecticides / Q000633:toxicity*; D009570:Nitriles / Q000633:toxicity*; D010839:Phytoplankton / Q000187:drug effects; D011722:Pyrethrins / Q000633:toxicity*; D014867:Water / Q000592:standards*; D014874:Water Pollutants, Chemical / Q000633:toxicity
D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; D014874:Water Pollutants, Chemical; D014867:Water; C037304:cyhalothrin