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Bacterial communities in trace metal contaminated lake sediments are dominated by endospore-forming bacteria

机译：微量金属污染的湖泊沉积物中的细菌群落主要由形成内生孢子的细菌控制

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摘要

Lake sediments in areas close to the outlet of wastewater treatment plants are sinks for pollutants. Bacterial communities in sediments are likely affected by the released effluents, but in turn they might modify the distribution and bioavailability of pollutants. On the shore of Lake Geneva, Switzerland, wastewater from the City of Lausanne is treated and discharged into the lake via an outlet pipe in the Vidy Bay. The objectives of this study were to assess (1) the impact of the treated wastewater release on the bacterial communities in the Vidy Bay sediments and (2) the potential link between bacterial communities and trace metal sediment content. Bacterial community composition and abundance were assessed in sediments collected in three areas with different levels of contamination. The main factors affecting bacterial communities were inferred by linking biological data with chemical analyses on these sediments. Near to the outlet pipe, large quantities of bacterial cells were detected in the three upper most cm (3.2 × 10~9 cells assessed by microscopy and 1.7 × 10~(10) copies of the 16S rRNA gene assessed by quantitative PCR, per gram of wet sediment), and the dominant bacterial groups were those typically found in activated sludge (e.g. Acidovorax defluivii and Hydrogen-ophaga caeni). Three samples in an area further away from the outlet and one sample close to it were characterized by 50 % of endospore-forming Firmicutes (Clostridium spp.) and a clear enrichment in trace metal content. These results highlight the potential role of endospore-forming Firmicutes on transport and deposition of trace metals in sediments.
机译：废水处理厂出口附近地区的湖泊沉积物是污染物汇。沉积物中的细菌群落可能受到释放的污水的影响，但反过来又可能改变污染物的分布和生物利用度。在瑞士日内瓦湖的岸上，洛桑市的废水经过处理，并通过维迪湾的出水管排入湖中。这项研究的目的是评估（1）处理后的废水释放对Vidy Bay沉积物中细菌群落的影响，以及（2）细菌群落与微量金属沉积物含量之间的潜在联系。在三个污染程度不同的地区收集的沉积物中评估了细菌群落的组成和丰度。通过将生物学数据与这些沉积物的化学分析联系起来，可以推断出影响细菌群落的主要因素。每克附近，在出水管附近，在最上方的三个厘米（通过显微镜评估的3.2×10〜9个细胞和通过定量PCR评估的1.7×10〜（10）拷贝的16S rRNA基因）中检测到大量细菌细胞，每克湿沉积物），而主要的细菌群是通常在活性污泥中发现的那些（例如，Acidovorax defluivii和Hydrogen-ophaga caeni）。距离出口较远的区域中的三个样品和靠近出口的一个样品的特征在于，有50％的形成内生孢子的菌毛（Clostridium spp。）和痕量金属含量的明显富集。这些结果突出了形成内生孢子的纤毛虫对沉积物中微量金属的运输和沉积的潜在作用。

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  • 来源
    《Aquatic Sciences》 |2014年第1期|S33-S46|共14页
  • 作者

    Loiec Sauvain; Matthieu Bueche; Thomas Junier; Matthieu Masson; Tina Wunderlin; Roxane Kohler-Milleret; Elena Gascon Diez; Jean-Luc Loizeau; Mary-Lou Tercier-Waeber; Pilar Junier;

  • 作者单位

    Laboratory of Microbiology, University of Neuchatel, Rue Emile Argand 11, 2000 Neuchatel, Switzerland;

    Laboratory of Microbiology, University of Neuchatel, Rue Emile Argand 11, 2000 Neuchatel, Switzerland;

    Laboratory of Microbiology, University of Neuchatel, Rue Emile Argand 11, 2000 Neuchatel, Switzerland;

    Analytical and Environmental Chemistry, Department of Inorganic and Analytical Chemistry, University of Geneva, Geneva, Switzerland;

    Laboratory of Microbiology, University of Neuchatel, Rue Emile Argand 11, 2000 Neuchatel, Switzerland;

    Laboratory Soil and Vegetation, University of Neuchatel, Neuchatel, Switzerland;

    Earth and Environmental Science Section, Institute F.-A. Forel, University of Geneva, Geneva, Switzerland;

    Earth and Environmental Science Section, Institute F.-A. Forel, University of Geneva, Geneva, Switzerland;

    Analytical and Environmental Chemistry, Department of Inorganic and Analytical Chemistry, University of Geneva, Geneva, Switzerland;

    Laboratory of Microbiology, University of Neuchatel, Rue Emile Argand 11, 2000 Neuchatel, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sediments; Bacterial communities; Firmicutes; Trace metals; High-throughput DNA sequencing; Lake Geneva;

    机译：沉积物;细菌群落;坚定;痕量金属;高通量DNA测序日内瓦湖;

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