Comparative microbial ecology study of the sediments and the water column of the Rio Tinto, an extreme acidic environment
Comparative microbial ecology study of the sediments and the water column of the Rio Tinto, an extreme acidic environment
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DOI：
10.1111/j.1574-6941.2012.01346.x
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发表时间：
2012-08-01
影响因子：
4.2
通讯作者：
Amils, Ricardo
中科院分区：
文献类型：
--
作者：
Garcia-Moyano, Antonio;Gonzalez-Toril, Elena;Amils, Ricardo
由于其高金属含量的沃茨和低pH值，力拓已显示出其模拟酸性矿山排水系统和生物湿法冶金操作的潜力。这些系统的大多数地质微生物学研究都集中在好氧水柱。一个基于序列的方法结合原位检测技术，使我们能够检查与亚氧和缺氧沉积物沿着河道的微生物群落的组成和结构，并将它们与栖息在水柱的水生生物群落进行比较。用不同的方法得到的结果是一致的，并揭示了一些主要的模式：较高的细胞密度和较高的丰富度（75比48操作分类单位）在沉积物中比在水柱。微生物群落是相关的，但河流沉积物似乎富含某些种群，其中一些以前没有在力拓盆地报告。沿着采样站之间检测到的差异与某些环境参数（例如铁浓度梯度）相关。生物和地球化学数据表明，沉积物的重要性，代表一个阶段的特别高的多样性，可能涉及到关键的代谢过程中的铁和硫循环。
Due to its highly metalliferous waters and low pH, the Rio Tinto has shown its potential for modelling both acid mine drainage systems and biohydrometallurgical operations. Most geomicrobiological studies of these systems have focused on the oxic water column. A sequence-based approach in combination with in situ detection techniques enabled us to examine the composition and structure of the microbial communities associated with the suboxic and anoxic sediments along the river course and to compare them with the planktonic communities inhabiting the water column. The results obtained with the different approaches were consistent and revealed some major patterns: higher cell density and higher richness (75 vs. 48 operational taxonomic units) in the sediments than in the water column. The microbial communities were related but the river sediments appear to be enriched in certain populations, some of which have not previously been reported in the Rio Tinto basin. The differences detected between sampling stations along the river correlate with certain environmental parameters (e.g. iron concentration gradient). The biological and geochemical data show the importance of the sediments as representing a phase of particular high diversity, probably related to key metabolic processes within both the iron and the sulfur cycles.