Sanderson Hans, Boudreau Timothy M, Mabury Scott A, Solomon Keith R
Department of Environment, Technology & Social Studies, University of Roskilde, PO-Box 260, DK 4000 Roskilde, Denmark.
Aquat Toxicol. 2003 Feb 12;62(3):227-34. doi: 10.1016/s0166-445x(02)00100-5.
There is presently, a substantial amount of information being gathered concerning the environmental risk associated with the perfluorooctanoic acid (PFOA) compound. The aim of this paper was to determine a 35 day community no observable effect concentration (NOEC(community)) or lowest observable effect concentration (LOEC) for freshwater zooplankton exposed to PFOA during a study in 30 l indoor aquatic microcosms. Some significant (P < 0.01) temporal fluctuations in zooplankton abundance were observed, however, a NOEC(community) could not be calculated. LOEC for various species varied between 10 and 70 mg l(-1). According to LOEC values, the tentative order of descriptors sensitivity was as follows: Daphnia magna > richness > or = Cyclops canthocamptus staphylinus > Cyclops diaptomus>total zooplankton > or = Rotifera sp. The long term ecological significance of these temporal fluctuations could not be determined in this study, however, the overall study cessation analysis showed that the structure of the ecosystem was changed from a more diverse community dominated by larger species towards a less diverse community dominated by smaller more and robust species (P < 0.05). Additional chronic toxicity testing should also be addressed since these compounds are so persistent and recalcitrant.
目前，有关全氟辛酸（PFOA）化合物所带来的环境风险，正在收集大量信息。本文的目的是在一项于30升室内水生微宇宙中开展的研究里，确定暴露于PFOA的淡水浮游动物的35天群落无可见效应浓度（NOEC(群落)）或最低可见效应浓度（LOEC）。观察到浮游动物丰度存在一些显著（P < 0.01）的时间波动，然而，无法计算出NOEC(群落)。不同物种的LOEC在10至70毫克/升之间变化。根据LOEC值，描述符敏感性的暂定顺序如下：大型溞>丰富度>或 = 针刺独眼水蚤>直额独眼水蚤>总浮游动物>或 = 轮虫属。在本研究中无法确定这些时间波动的长期生态意义，然而，总体研究终止分析表明，生态系统结构从一个以较大物种为主的更多样化群落转变为一个以更小、更多且更强壮物种为主的较不多样化群落（P < 0.05）。由于这些化合物具有如此高的持久性和难降解性，还应开展额外的慢性毒性测试。
