Abstract：
A microcosm bioassay was designed to assess the efficacy of wastewater treatment methods used in sewage plants. The taxonomic and feeding characteristics of a meiobenthic nematode assemblage from Ghar El Melh lagoon (Tunisia) were used to achieve this goal. Nematode assemblages were exposed for 30 days to untreated wastewater (UW) obtained from the sewage treatment plant of Sidi Ahmed (Tunisia) and three mixtures with treated wastewater (TW33 = 33%, TW66 = 66%, and TW100 = 100%). Concerning the nematode abundance, the exposure to either treated wastewater (TW33-100) or untreated wastewater (UW) had no significant effect. In contrast, Shannon-Wiener index and Pielou\'s Evenness were clearly reduced by contamination with both types of wastewater, with a more pronounced negative impact prior to treatment in the sewage plant. The multivariate analyzes revealed a change in the taxonomic composition of the nematofauna in response to the contamination by untreated or treated wastewater. The relative abundances of species in wastewater replicates compared to controls reflected this taxonomic restructuring. Finally, Ascolaimus elongatus, Terschellingia communis, and Kraspedonema octogoniata were less represented in all experimentally treated units and could be considered as \'sensitive taxa to wastewater\'. While, Paracomesoma dubium, appears to be a \'tolerant and/or opportunistic\' species, showing increased relative abundances under all wastewater treatments.
摘要：
设计了一种微观生物测定法来评估污水处理厂中使用的废水处理方法的有效性。来自GharElMelh泻湖（突尼斯）的中生线虫组合的分类学和摄食特征被用来实现这一目标。将线虫组合物暴露于从SidiAhmed（突尼斯）的污水处理厂获得的未经处理的废水（UW）中30天，以及三种与经处理的废水的混合物（TW33=33％，TW66=66%,TW100=100%)。关于线虫的丰度，暴露于处理过的废水（TW33-100）或未经处理的废水（UW）没有显着影响。相比之下,Shannon-Wiener指数和Pielou的均匀度由于两种类型的废水的污染而明显降低，在污水处理厂处理前产生更明显的负面影响。多变量分析显示，线虫的分类学组成因未经处理或处理过的废水的污染而发生变化。与对照相比，废水复制中物种的相对丰度反映了这种分类结构。最后,长毛Ascolaimuselongatus,Terschellingiacommunis，在所有经过实验处理的单元中，octogoniata和Kraspedonema的代表较少，可以被认为是“对废水敏感的分类群”。同时,副介孔瘤，似乎是一个宽容和/或机会主义的物种，在所有废水处理下显示相对丰度增加。
