Efficiency of Experimental Rice (Oryza sativa L.) Fields in Mitigating Diazinon Runoff Toxicity to Hyalella azteca
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This study assessed the viability of using planted, mature rice fields in mitigating diazinon (an organophosphate insecticide) runoff toxicity using aqueous 48 h Hyalella azteca whole effluent toxicity bioassays. Rice fields decreased diazinon concentrations 80.1%–99.9% compared with 10.8% in the unvegetated field control. H. azteca survival responses coincided with observed diazinon concentrations. Estimated LC50 effects dilutions (%) ranged from 1.15 to 1.47 for inflow samples and 1.66 (unvegetated), 6.44 (rice field A), and >100 (rice field B) outflow samples. Decreases in inflow versus outflow aqueous toxicity were 77.1%–100% in rice fields compared with 18.7% in the unvegetated field.
KeywordsWetlands Organophosphate toxicity Hyalella azteca
The authors would like to thank Sammie Smith, Charlie Cooper, Sam Testa, Calvin Vick, Tim Sullivan, James Hill, and Lisa Brooks for technical and analytical assistance. Mention of equipment, software or pesticide 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 nondiscriminatory basis without regard to race, color, national origin, religion, sex, marital status, or handicap.
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