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Influence of Selected Water Quality Characteristics on the Toxicity of λ-Cyhalothrin and γ-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 λ-cyhalothrin and γ-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 λ-cyhalothrin and γ-cyhalothrin, respectively. For both pyrethroids, EC50 values linearly increased as turbidity, suspended solids, dissolved organic carbon and chlorophyll a concentrations increased.

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Appreciation is extended to L. Brooks, A. Delmastro, J. Hill, and C. Bryant for technical and analytical assistance as well as M. Moore, L. Southwick, and J. Bouldin for providing valuable comments while reviewing an earlier version of the manuscript. Mention of equipment, software or chemicals does not constitute an endorsement for use by the US Department of Agriculture nor does it imply pesticide registration under FIFRA as amended. All programs and services of the USDA are offered on a non-discriminatory basis without regard to race, color, national origin, sex, marital status, or handicap.

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Correspondence to S. Smith Jr.

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Smith, S., Lizotte, R.E. Influence of Selected Water Quality Characteristics on the Toxicity of λ-Cyhalothrin and γ-Cyhalothrin to Hyalella azteca . Bull Environ Contam Toxicol 79, 548–551 (2007).

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  • λ-Cyhalothrin
  • γ-Cyhalothrin
  • Toxicity
  • Phytoplankton