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首页> 外文期刊>Environmental toxicology and chemistry >Impact Of Aquatic Insect Life Stage And Emergence Strategy On Sensitivity To Esfenvalerate Exposure
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Impact Of Aquatic Insect Life Stage And Emergence Strategy On Sensitivity To Esfenvalerate Exposure

机译：水生昆虫生命阶段和萌发策略对精油暴露敏感性的影响

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摘要

We investigated the impact of aquatic insect life stage and emergence strategy on sensitivity to esfenvalerate, a synthetic pyrethroid insecticide, using field-collected Brachycentrus americanus Banks (Trichoptera: Brachycentridae) and Cinygmula re-ticulata McDunnough (Ephemeroptera: Heptageniidae) insects. Final-instar C. reticulata emergence was observed for one week following three environmentally relevant, 48-h esfenvalerate exposures (0.005, 0.01, and 0.015 μg/L). Emergence was significantly depressed following exposure to esfenvalerate and resulted from an increase in nymph mortality during the emergence process. This experiment was duplicated for late-instar C. reticulata nymphs, which were similar in size to the final-instar nymphs but were not near emergence. Late-instar C. reticulata mayflies were approximately fivefold less sensitive to esfenvalerate exposures as gauged by one-week mortality rates. Brachycentrus americanus pupal mortality was significantly increased over that in controls following 48-h esfenvalerate exposures of 0.1 and 0.2 μg/L. These response concentrations correlated closely with those for case-abandonment rates of fourth-instar B. americanus larvae (a sublethal effect of esfenvalerate exposure). Pupal mortality rates were approximately 16-fold higher than those observed in larvae. Adult female egg weight as a percentage of total body weight was significantly decreased following pupal esfenvalerate exposures of 0.05, 0.1, and 0.2 μg/L. These findings suggest that exposure to esfenvalerate may impair hemimetabolous insect emergence behaviors and may decrease fecundity in holometabolous aquatic insects.
机译：我们使用田间采集的美洲短吻鳄（Trichoptera：Brachycentridae）和Cinygmula re-ticulata McDunnough（Ephemeroptera：Heptageniidae）昆虫调查了水生昆虫生命周期和出现策略对合成除虫菊酯类除草菊杀虫剂esfenvalerate的敏感性。在三个与环境相关的48小时乙醛戊酸酯暴露（0.005、0.01和0.015μg/ L）之后，观察到了最后一龄网状网状芽孢的出现一周。暴露于艾斯戊戊酸酯后，出苗率显着下降，这是由于出苗过程中若虫死亡率增加所致。对晚熟网纹若虫若虫进行了重复实验，其大小与末龄新虫若虫相似，但几乎没有出现。根据一星期的死亡率，晚熟网纹夜蛾可能对依斯戊戊酸酯暴露的敏感性降低约五倍。在0.1和0.2μg/ L的48小时esfenvalerate暴露后，美洲短吻cent的mortality死亡率显着高于对照组。这些反应的浓度与四龄美洲小。虫幼虫的遗弃率密切相关（esfenvalerate暴露的亚致死作用）。 pal死亡率比幼虫高出约16倍。 p浓度为0.05、0.1和0.2μg/ L后，成年雌性鸡蛋重量占总体重的百分比显着降低。这些发现表明，暴露于乙草戊酸酯可能会损害半代谢昆虫的出苗行为，并可能降低全代谢水生昆虫的繁殖力。

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