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.
- American Public Health Association (APHA) (1998) Standard methods for the examination of water and wastewater, 20th edn. American Public Health Association, American Water Works Association, Water Environment Federation, Washington, DCGoogle Scholar
- de March BGE (1981) Hyalella azteca (Saussure). In: Lawrence SG (ed) Manual for the culture of selected freshwater invertebrates. Can Spec Publ Fish Aquat Sci 54:61–77Google Scholar
- Smith S, Cooper CM, Lizotte RE, Locke MA, Knight SS (2007) Pesticides in lake water in the Beasley Lake watershed, 1998–2005. Int J Ecol Environ Sci 33:61–71Google Scholar
- Statistical Package for the Social Sciences (SPSS) Inc. (1997) SigmaStat for Windows version 2.03Google Scholar
- US Department of Agriculture (USDA) National Agricultural Statistical Service (NASS) (2006) Agricultural chemical use database. http://www.pestmanagement.info/nass/act_dsp_statcs2_state.cfm
- US Environmental Protection Agency (USEPA) (2000) Methods for measuring the toxicity and bioaccumulation of sediment-associated contaminants with freshwater invertebrates. EPA 600/R-99/064 Washington, DCGoogle Scholar
- US Environmental Protection Agency (USEPA) (2002) Methods for measuring the acute toxicity of effluents and receiving waters with freshwater and marine organisms. EPA 821/R-02/012 Washington, DCGoogle Scholar