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法国卡尔努莱斯富含铁砷的酸性矿山排水中的微生物多样性。

Diversity of microorganisms in Fe-As-rich acid mine drainage waters of Carnoulès, France.

作者信息

Bruneel O, Duran R, Casiot C, Elbaz-Poulichet F, Personné J-C

机构信息

Laboratoire Hydrosciences Montpellier, UMR5569, Université Montpellier 2, Place E. Bataillon, Case MSE, 34095 Montpellier cedex 05, France.

出版信息

Appl Environ Microbiol. 2006 Jan;72(1):551-6. doi: 10.1128/AEM.72.1.551-556.2006.

Abstract

The acid waters (pH 2.7 to 3.4) originating from the Carnoulès mine tailings contain high concentrations of dissolved arsenic (80 to 350 mg.liter(-1)), iron (750 to 2,700 mg.liter(-1)), and sulfate (2,000 to 7,500 mg.liter(-1)). During the first 30 m of downflow in Reigous creek issuing from the mine tailings, 20 to 60% of the dissolved arsenic is removed by coprecipitation with Fe(III). The microbial communities along the creek have been characterized using terminal-restriction fragment length polymorphism (T-RFLP) and 16S rRNA gene library analyses. The results indicate a low bacterial diversity in comparison with unpolluted water. Eighty percent of the sequences obtained are related to sequences from uncultured, newly described organisms or recently associated with acid mine drainage. As expected owing to the water chemistry, the sequences recovered are mainly related to bacteria involved in the geochemical Fe and S cycles. Among them, sequences related to uncultured TrefC4 affiliated with Gallionella ferruginea, a neutrophilic Fe-oxidizing bacterium, are dominant. The description of the bacterial community structure and its dynamics lead to a better understanding of the natural remediation processes occurring at this site.

摘要

源自卡尔努莱斯矿尾矿的酸性水(pH值2.7至3.4)含有高浓度的溶解态砷(80至350毫克/升)、铁(750至2700毫克/升)和硫酸盐(2000至7500毫克/升)。在从矿尾矿流出的雷古溪流中向下游流动的前30米内,20%至60%的溶解态砷通过与Fe(III)共沉淀而被去除。利用末端限制性片段长度多态性(T-RFLP)和16S rRNA基因文库分析对溪流沿线的微生物群落进行了表征。结果表明,与未受污染的水相比,细菌多样性较低。所获得序列的80%与未培养的、新描述的生物体的序列或最近与酸性矿山排水相关的序列有关。正如由于水化学所预期的那样,回收的序列主要与参与地球化学铁和硫循环的细菌有关。其中,与未培养的隶属于嗜中性铁氧化细菌铁锈盖菌属的TrefC4相关的序列占主导地位。对细菌群落结构及其动态的描述有助于更好地理解该地点发生的自然修复过程。

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