University of Alaska Anchorage, USA.
University of Alaska Anchorage, USA.
Chemosphere. 2022 Feb;288(Pt 2):132478. doi: 10.1016/j.chemosphere.2021.132478. Epub 2021 Oct 6.
Rotenone is a pesticide commonly used to eradicate Northern Pike (Esox lucius), an invasive species, in Southcentral Alaska. The present work incorporates a field investigation of rotenone attenuation in eight lakes of the Kenai Peninsula, following a CFT Legumine® treatment in October 2018 and a laboratory simulation to determine persistence under light/dark and sterile/nonsterile conditions representative of Southcentral Alaskan winters. In the field, rotenone degraded within <60 days of application in all lakes, while rotenolone, the primary product of rotenone degradation, persisted for up to <280 days post-treatment at two locations. Prolonged rotenolone attenuation was most likely caused by short days and ice cover between October and April. This hypothesis was supported by a laboratory simulation which revealed photolysis as the dominant process driving the overall degradation of rotenone and that microbial degradation will significantly contribute in the absence of sunlight under simulated "winter" conditions of 4 °C. Degradation model fit comparisons (pseudo-first order, multi-parameter linear, and gamma) indicate the most accurate prediction occurred when modeling all eight lakes grouped together in a single dataset, combined and treated with pseudo-first order model kinetics, based on Akaike information criteria (AIC) scores.
鱼藤酮是一种常用于消灭阿拉斯加中南地区入侵物种北方狗鱼（Esox lucius）的杀虫剂。本研究在 2018 年 10 月使用 CFT Legumine®进行处理后，对基奈半岛的 8 个湖泊进行了实地调查，以了解鱼藤酮在中南阿拉斯加冬季光照/黑暗和无菌/非无菌条件下的衰减情况，并进行了实验室模拟。在野外，所有湖泊中的鱼藤酮在施药后 <60 天内降解，而鱼藤酮，即鱼藤酮降解的主要产物，在两个地点的处理后长达 <280 天仍有残留。鱼藤酮的衰减时间延长很可能是由于 10 月至 4 月期间日照时间短和冰盖覆盖所致。这一假设得到了实验室模拟的支持，模拟结果表明光解是鱼藤酮整体降解的主要过程，在模拟“冬季”4°C 条件下没有阳光的情况下，微生物降解将显著发挥作用。降解模型拟合比较（一级伪数、多参数线性和伽马）表明，当以基于 Akaike 信息准则（AIC）得分的拟一级模型动力学对所有 8 个湖泊进行组合和处理时，对所有 8 个湖泊进行分组并在单个数据集中进行建模时，预测结果最准确。
