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Diversity of anaerobic bacteria in sediments from a subtropical reservoir

机译：亚热带水库沉积物中厌氧细菌的多样性

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摘要

A descriptive analysis of microbial communities from two different sediment locations in a subtropical reservoir was undertaken, using DGGE and 16S rRNA gene clone library. This study evaluated bacterial diversity in the sediment of a subtropical reservoir, based on quantitative and qualitative analyses of sulphate-reducing bacteria (SRB), denitrifying bacteria (DB) and hydrogen-producing bacteria (HPB). The sediment samples were taken from a subtropical reservoir (Ibiuna, SP, Brazil), being collected at two contrasting sites, including (A) at a 4 m depth and (B) at an 11 m depth of the water column. The anaerobic bacteria population density in the sediment was estimated with the most probable number (MPN) method. The microbial diversity of the sediment was assessed by molecular biology analyses for the domain Bacteria. Increased cell count numbers were observed in sample A for DB. The count for sample B was higher for SRB and HPB. Both sediment communities (A and B samples) exhibited a high diversity. They were similar to the phyla Proteobacteria, Chloroflexi, Fir-micutes, Actinobacteria, Cyanobacteria, Fusobacteria, Deferribacteres, Verrucomicrobia and uncultivated bacteria. The environmental conditions of sediments from tropical climates were mainly sunlight during the day and temperatures around 25 ℃, which would favour the maintenance of nutrients and the available organic matter for establishing the anaerobic bacteria populations. The microbial diversity observed for both samples indicates new possibilities for application of the sediment reservoir in regard to biotechnological processes such as the operation of anaerobic reactors for wastewater and toxic compound treatment, bioenergy generation and production of biogases such as hydrogen and methane.
机译：使用DGGE和16S rRNA基因克隆文库，对亚热带水库中两个不同沉积物位置的微生物群落进行了描述性分析。这项研究基于对硫酸盐还原细菌（SRB），反硝化细菌（DB）和产氢细菌（HPB）的定量和定性分析，评估了亚热带水库沉积物中细菌的多样性。沉积物样品取自亚热带水库（巴西，Ibiuna），在两个对比点采集，包括（A）水深4 m和（B）水深11 m。沉积物中厌氧菌的种群密度用最可能数法（MPN）估算。通过分子生物学分析评估了沉积物的微生物多样性。在用于DB的样品A中观察到细胞计数增加。对于SRB和HPB，样品B的计数更高。沉积物群落（A和B样品）都表现出高度的多样性。它们类似于门的Proteobacteria，Chloroflexi，Fir-micutes，Actinobacteria，Cyanobacteria，Fusobacteria，Deferribacteres，Verrucomicrobia和未培养的细菌。来自热带气候的沉积物的环境条件主要是白天的阳光和25℃左右的温度，这有利于维持养分和建立厌氧细菌种群所需的有机物质。从两个样品中观察到的微生物多样性表明，在生物技术过程中，例如在厌氧反应器的运行中，废水和有毒化合物的处理，生物能的产生以及沼气（如氢气和甲烷的产生）的应用，都有可能用于沉积物库。

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