title: Efficiency of experimental rice (Oryza sativa L.) fields in mitigating diazinon runoff toxicity to Hyalella azteca.
abstract: 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.
authors.affiliation: USDA-ARS National Sedimentation Laboratory, P.O. Box 1157, Oxford, MS 38655, USA. matt.moore@ars.usda.gov
authors.forename: Matthew T
authors.initials: MT
authors.lastname: Moore
authors.forename: Richard E
authors.initials: RE
authors.lastname: Lizotte
authors.forename: Robert
authors.initials: R
authors.lastname: Kröger
mesh_terms: D033304:Amphipoda / Q000187:drug effects*; D000818:Animals; D001673:Biodegradation, Environmental; D018556:Crops, Agricultural; D003976:Diazinon / Q000633:toxicity*; D007306:Insecticides / Q000633:toxicity*; D012275:Oryza; D014874:Water Pollutants, Chemical / Q000633:toxicity*; D053833:Wetlands
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D003976:Diazinon