Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, Amsterdam, 1081 HV, The Netherlands.
Department of Environment and Health, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, Amsterdam, 1081 HV, The Netherlands.
Ecotoxicology. 2017 Apr;26(3):320-328. doi: 10.1007/s10646-017-1765-8. Epub 2017 Jan 23.
In a recent study, we showed that the springtail Folsomia candida was quite sensitive the neonicotinoid insecticides imidacloprid and thiacloprid. This study aimed at determining the toxicity of both compounds to F. candida following exposure over three generations, in natural LUFA 2.2 standard soil. In the first generation, imidacloprid was more toxic than thiacloprid, with LCs of 0.44 and 9.0 mg/kg dry soil, respectively and ECs of 0.29 and 1.5 mg/kg dry soil, respectively. The higher LC/EC ratio suggests that thiacloprid has more effects on reproduction, while imidacloprid shows lethal toxicity to the springtails. In the multigeneration tests, using soil spiked at the start of the first generation exposures, imidacloprid had a consistent effect on survival and reproduction in all three generations, with LCs and ECs of 0.21-0.44 and 0.12-0.29 mg/kg dry soil, respectively, while thiacloprid-exposed animals showed clear recovery in the second and third generations (LC and EC > 3.33 mg/kg dry soil). The latter finding is in agreement with the persistence of imidacloprid and the fast degradation of thiacloprid in the test soil.
在最近的一项研究中，我们表明跳虫 Folsomia candida 对新烟碱类杀虫剂吡虫啉和噻虫啉非常敏感。本研究旨在确定这两种化合物在自然 LUFA 2.2 标准土壤中经过三代暴露对 F. candida 的毒性。在第一代中，吡虫啉比噻虫啉毒性更大，LC50 分别为 0.44 和 9.0 mg/kg 干土，EC50 分别为 0.29 和 1.5 mg/kg 干土。较高的 LC/EC 比值表明噻虫啉对繁殖的影响更大，而吡虫啉对跳虫具有致死毒性。在多代试验中，使用在第一代暴露开始时添加的土壤，吡虫啉在所有三代中对生存和繁殖都有一致的影响，LC50 和 EC50 分别为 0.21-0.44 和 0.12-0.29 mg/kg 干土，而噻虫啉暴露的动物在第二代和第三代中明显恢复（LC 和 EC>3.33 mg/kg 干土）。这一发现与吡虫啉的持久性和噻虫啉在试验土壤中的快速降解一致。
