Washington Cooperative Fish and Wildlife Research Unit, School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, USA.
Washington Cooperative Fish and Wildlife Research Unit, School of Aquatic and Fishery Sciences, University of Washington, United States Geological Survey, Seattle, Washington, USA.
Environ Toxicol Chem. 2017 Sep;36(9):2316-2326. doi: 10.1002/etc.3767. Epub 2017 Mar 21.
Aquatic herbicides are used to manage invasive emergent plants in and around wetlands. Metamorphic frogs that emerge during the aquatic weed management season may be at risk of herbicide exposure. Metamorphic northern red-legged frogs (Rana aurora) were exposed to a triclopyr tank mix labeled for control of broadleaf emergent aquatic weeds such as invasive purple loosestrife (Lythrum salicaria). The tank mix consisted of Renovate® 3 (triclopyr triethylamine salt 44.4%), the modified vegetable oil surfactant Competitor®, and the marker dye Hi-Light . Metamorphs were exposed to the tank mix and a clean-water control for 96 h, and then reared in clean water for 60 d. Exposure to the tank mix resulted in no treatment-related mortalities, no effects on behavior immediately post exposure, and no effects on body or liver condition indices. Exposure to the tank mix resulted in lethargy during exposure and a 1-d delay in completion of metamorphosis. Deformities present in the rearing population confounded results for some endpoints. Observed effects were minimal, especially compared with the potential for ecological impacts from unmanaged invasive plants. Environ Toxicol Chem 2017;36:2316-2326. © 2017 SETAC.
水生除草剂用于管理湿地内及周围的入侵性挺水植物。在水生杂草管理季节出现的变态青蛙可能面临接触除草剂的风险。变态北方红腿蛙（Rana aurora）暴露于一种三氯吡氧乙酸桶混剂中，该桶混剂用于控制阔叶挺水水生杂草，如入侵性紫薇（Lythrum salicaria）。该桶混剂由 Renovate® 3（三氯吡氧乙酸三乙胺盐 44.4%）、改良植物油表面活性剂 Competitor® 和标记染料 Hi-Light 组成。变态蛙暴露于桶混剂和清洁水对照中 96 小时，然后在清洁水中饲养 60 天。暴露于桶混剂没有导致与处理相关的死亡率，没有立即在暴露后对行为产生影响，也没有对身体或肝脏状况指数产生影响。暴露于桶混剂导致暴露期间活动力下降，并导致变态完成延迟 1 天。饲养种群中存在的畸形使一些终点的结果变得复杂。观察到的影响很小，尤其是与未管理的入侵植物造成的生态影响相比。环境毒理化学 2017；36:2316-2326. © 2017 SETAC。
