Bielefeld University, Department of Animal Ecology, Konsequenz 45, 33615 Bielefeld, Germany.
Bielefeld University, Department of Animal Ecology, Konsequenz 45, 33615 Bielefeld, Germany; Ecossa, Giselastr. 6, 82319 Starnberg, Germany.
Ecotoxicol Environ Saf. 2018 Feb;148:244-253. doi: 10.1016/j.ecoenv.2017.10.030. Epub 2017 Nov 6.
Freshwater microcosms were used to investigate the effects of various metals and polycyclic aromatic hydrocarbons (PAHs), applied as single substances and in mixtures, on sediment-inhabiting nematode assemblages. Several community measures, including nematode abundance, biomass, species richness, species composition and the NemaSPEAR[%]-index, were assessed and their changes in response to the chemical treatments were compared with the results of single-species toxicity testing using the nematode Caenorhabditis elegans. The diagnostic power of endpoints revealing toxic effects was then evaluated to assess the general suitability of nematodes as bioindicators of sediment contamination by a set of relevant chemicals. Overall, community measures based on species-level (detected with principle response curves) responded most sensitively to chemical stress in the microcosms, especially in terms of biomass, with the C. elegans toxicity test was for the most part as sensitive to the chemicals as the nematode species composition. Generally, this study justified the suitability of nematodes in assessments of the risk of chemicals frequently associated with freshwater sediments and underlined the value of C. elegans in the prospective risk assessment of chemicals, as this species was able to indicate the negative effects of comparatively low sediment concentrations of the contaminants.
采用淡水微型生物群落来研究各种金属和多环芳烃（PAHs）作为单一物质和混合物对底栖线虫群落的影响。评估了包括线虫丰度、生物量、物种丰富度、物种组成和 NemaSPEAR[%]指数在内的多个群落指标，并将其对化学处理的变化与使用线虫秀丽隐杆线虫进行的单一物种毒性测试的结果进行了比较。然后，评估了揭示毒性效应的终点的诊断能力，以评估线虫作为一组相关化学物质污染底泥的生物指示剂的一般适用性。总体而言，基于物种水平的群落指标（通过主响应曲线检测）对微宇宙中的化学压力最敏感，尤其是在生物量方面，而秀丽隐杆线虫毒性测试在很大程度上与线虫物种组成一样对化学物质敏感。一般来说，这项研究证明了线虫在评估与淡水沉积物经常相关的化学物质风险方面的适用性，并强调了秀丽隐杆线虫在化学物质的潜在风险评估中的价值，因为该物种能够指示污染物相对较低的底泥浓度的负面影响。
