Guasch H, Lehmann V, van Beusekom B, Sabater S, Admiraal W
Institute of Aquatic Ecology, Faculty of Sciences, University Girona (UdG), Campus de Montilivi, 17071, Girona, Spain.
Arch Environ Contam Toxicol. 2007 Jan;52(1):32-7. doi: 10.1007/s00244-005-0186-5. Epub 2006 Oct 23.
After indications from the literature that nutrient concentrations may modify the toxicity of herbicides to natural periphyton communities, this study aims to provide experimental proof for atrazine. In this microcosm experiment, phosphate (P) addition did not ameliorate atrazine toxicity to periphyton. Three weeks of P addition did not increase atrazine tolerance (measured as EC50 in acute toxicity tests), whereas exposure to atrazine under conditions that were either P-limited or non-P-limited clearly reduced the development of algal biomass. Long-term exposure to atrazine induced tolerance of the community to the herbicide, and this was not influenced by P addition. Tolerance induction in this microcosm experiment has been compared with previously published field data from the same area of study and indicates that tolerance induction by atrazine may take place under atrazine exposure in streams as well as in microcosms.
鉴于文献表明营养物质浓度可能会改变除草剂对天然周丛生物群落的毒性，本研究旨在为阿特拉津提供实验证据。在这个微观世界实验中，添加磷酸盐（P）并不能减轻阿特拉津对周丛生物的毒性。添加P三周并未提高阿特拉津耐受性（在急性毒性试验中以EC50衡量），而在P限制或非P限制条件下接触阿特拉津明显减少了藻类生物量的增长。长期接触阿特拉津会诱导群落对除草剂产生耐受性，且这不受添加P的影响。本微观世界实验中的耐受性诱导已与先前发表的来自同一研究区域的实地数据进行了比较，结果表明在溪流以及微观世界中，阿特拉津暴露下可能会发生对阿特拉津的耐受性诱导。
