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首页> 外文期刊>Environmental toxicology and chemistry >FIPRONIL EFFECTS ON ESTUARINE COPEPOD (AMPHIASCUS TENUIREMIS) DEVELOPMENT, FERTILITY, AND REPRODUCTION: A RAPID LIFE-CYCLE ASSAY IN 96-WELL MICROPLATE FORMAT
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FIPRONIL EFFECTS ON ESTUARINE COPEPOD (AMPHIASCUS TENUIREMIS) DEVELOPMENT, FERTILITY, AND REPRODUCTION: A RAPID LIFE-CYCLE ASSAY IN 96-WELL MICROPLATE FORMAT

机译：前锋对口鼻菜（AMPHIASCUS TENUIREMIS）发育，生育力和繁殖的影响：96孔微孔板格式的快速生命周期测定

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摘要

Fipronil is a novel γ-aminobutyric acid receptor-specific phenylpyrazole insecticide commonly used near estuarine environments for rice production, turf-grass management, and residential insect control. In this study, we evaluated the acute, developmental, and reproductive toxicity of fipronil to the estuarine harpacticoid copepod Amphiascus tenuiremis. Fipronil was highly toxic to A. tenuiremis (adult 96-h median lethal concentration [LC50] = 6.8 μg/L) and was more toxic to male copepods (96-h LC50 = 3.5 μg/L) than to nongravid female copepods (96-h LC50 = 13.0 μg/L). By using a newly developed 96-well microplate-based life-cycle toxicity test, we successfully reared single individuals of A. tenuiremis to adulthood in 200-μl microwells and concurrently assessed developmental and reproductive effects (after paired virginal matings) of environmentally relevant aqueous fipronil concentrations (0.16, 0.22, and 0.42 μg/L measured). Throughout the entire life cycle, copepod survival in all treatments was >90%. However, fipronil at 0.22 μg/L and higher significantly delayed male and female development from stage 1 copepodite to adult by approximately 2 d. More importantly, fipronil significantly halted female egg extrusion by 71% in the 0.22-μg/L fipronil treatment, and nearly eliminated reproduction (94% failure) in the 0.42-μg/L fipronil treatment. A three-generation Leslie matrix-based population growth model of fipronil reproductive and life-cycle impacts predicted a 62% decline in population size of A. tenuiremis relative to controls at only 0.16 μg/L.
机译：Fipronil是一种新型的γ-氨基丁酸受体特异性苯基吡唑类杀虫剂，通常在河口环境附近用于水稻生产，草皮管理和住宅昆虫防治。在这项研究中，我们评估了氟虫腈对河口类立足类co足类Am虫Amphiascus tenuiremis的急性，发育和生殖毒性。 Fipronil对A. tenuiremis（成人96小时平均致死浓度[LC50] = 6.8μg/ L）有高毒性，并且对雄性co足类动物（96-h LC50 = 3.5μg/ L）的毒性比对非重雌性co足类动物（96 -h LC50 = 13.0μg/ L）。通过使用新开发的基于96孔微孔板的生命周期毒性测试，我们成功地在200μl微孔中成功饲养了单条曲霉成年个体，并同时评估了与环境相关的水的发育和生殖效应（配对初次交配后）氟虫腈浓度（测得的浓度为0.16、0.22和0.42μg/ L）。在整个生命周期中，所有处理中co足类的存活率均> 90％。然而，氟虫腈的浓度为0.22μg/ L或更高，则将男性和女性从1阶段的角铁足动物到成年的发育明显延迟了大约2 d。更重要的是，在0.22-μg/ L的氟虫腈处理中，氟虫腈显着阻止了雌性卵的挤出71％，而在0.42-μg/ L的氟虫腈处理中，氟虫腈几乎消除了繁殖（94％失败）。三代基于莱斯利矩阵的氟虫腈对生殖和生命周期影响的种群增长模型预测，相对于对照，仅0.16μg/ L的A. tenuiremis种群规模将下降62％。

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