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首页> 外文期刊>Environmental toxicology and chemistry >FATE AND EFFECTS OF THE HERBICIDE ATRAZINE IN FLOW-THROUGH WETLAND MESOCOSMS
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FATE AND EFFECTS OF THE HERBICIDE ATRAZINE IN FLOW-THROUGH WETLAND MESOCOSMS

机译：杀虫剂阿特拉津在流经湿地湿地微生物中的命运和影响

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Wetland mesocosms were exposed to increasing concentrations of atrazine over time at levels typical of midwestern surface waters following spring runoff (15 to 75 μg/L). Atrazine had a half-life of 8 to 14 d in the 230-m-long wetlands. End points measured included nutrient levels; periphyton biomass; periphyton productivity and respiration; growth of selected macrophytes; and survival and growth of Daphnia magna (15, 25 μg/L atrazine), Rana pipiens (15, 25 μg/L), and Pimephales promelas larvae (25 to 75 μg/L) and adults (50, 75 μg/L). Interaction between nutrient status or grazing intensity and atrazine effects were measured using periphyton enrichment and grazing exclosure experiments. Only periphyton, Ceratophyllum demersum, Zizania aquatica, and Daphnia were significantly affected by atrazine at any of the concentrations tested. Periphyton net productivity was significantly depressed by incubation in treated water as compared to control water at ≥25 μg/L atrazine (9 to 27-d exposures). In response, dissolved nutrient concentrations increased in treated mesocosms after 14 d. Ceratophyllum length/weight ratios increased after 6-d exposures to 50 μg/L atrazine, while Zizania senesced prematurely during treatments of 50 or 75 μg/L atrazine (97 d of cumulative exposure). Periphyton developed resistance to atrazine only at concentrations ≥50 μg/L. Atrazine effects on periphyton composition varied with the N:P supply ratio. Daphnia survival was significantly depressed at 15 μg/L atrazine (48-h exposures).
机译：春季径流之后，中西部地表水的湿地中膜随着时间的推移暴露于浓度不断升高的阿特拉津（15至75μg/ L）。阿特拉津在230米长的湿地中的半衰期为8到14天。测量的终点包括营养水平；浮游生物量浮游植物的生产力和呼吸；精选大型植物的生长；大型蚤（15，25μg/ L阿特拉津），淡水蛙（15，25μg/ L）和小果蝇（Pimephales promelas幼虫）（25至75μg/ L）和成年（50，75μg/ L）的存活和生长。养分状况或放牧强度与r去津效果之间的相互作用使用植物周围植物富集和放牧暴露实验进行了测量。在任何所测试的浓度下，只有阿特拉津显着影响了附生植物，德兰角藻，水生Zizania aquatica和水蚤。与对照水相比，在≥25μg/ L阿特拉津的情况下（暴露9到27天），在处理过的水中孵育会显着降低周生藻的净生产力。作为响应，处理后的中膜在14 d后溶解的营养物浓度增加。 6 d暴露于50μg/ L阿特拉津后，角藻的长度/重量比增加，而Zizania在50或75μg/ L阿特拉津的治疗期间（累积暴露97 d）过早地感觉衰弱。百生植物仅在浓度≥50μg/ L时对阿特拉津产生抗药性。 r去津对附生植物组成的影响随N：P供应比的变化而变化。在15μg/ L阿特拉津（暴露48小时）时，水蚤的存活率显着降低。

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