Effects of an atrazine, metolachlor and fipronil mixture on Hyalella azteca (Saussure) in a modified backwater wetland.
We examined the toxicity mitigation efficiency of a hydrologically modified backwater wetland amended with a pesticide mixture of atrazine, metolachlor, and fipronil, using 96 h survival bioassays with Hyalella azteca. Significant H. azteca 96 h mortality occurred within the first 2 h of amendment at the upstream amendment site but not at any time at the downstream site. H. azteca survival varied spatially and temporally in conjunction with measured pesticide mixture concentrations. Hyalella azteca 96 h survival pesticide mixture effects concentrations ranges were 10.214–11.997, 5.822–6.658, 0.650–0.817, and 0.030–0.048 μg L−1 for atrazine, metolachlor, fipronil, and fipronil-sulfone, respectively.
Lizotte
Richard E
RE
USDA-ARS National Sedimentation Laboratory, P.O. Box 1157, Oxford, MS 38655, USA. richard.lizotte@ars.usda.gov
Knight
Scott S
SS
Shields
F Douglas
FD
Bryant
Charles T
CT
D000081:Acetamides / Q000032:analysis / Q000633:toxicity*; D033304:Amphipoda / Q000187:drug effects*; D000818:Animals; D001280:Atrazine / Q000032:analysis / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D006540:Herbicides / Q000032:analysis / Q000633:toxicity*; D007306:Insecticides / Q000032:analysis / Q000633:toxicity*; D011720:Pyrazoles / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity; D053833:Wetlands
D000081:Acetamides; D004338:Drug Combinations; D006540:Herbicides; D007306:Insecticides; D011720:Pyrazoles; D014874:Water Pollutants, Chemical; C082360:fipronil; D001280:Atrazine; C051786:metolachlor