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Core bacterial community composition of a cryptoendolithic ecosystem in the Grand Staircase‐Escalante National Monument Utah

机译：犹他州大楼梯-埃斯卡兰特国家历史文物中的隐岩层生态系统的核心细菌群落组成

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Cryptoendolithic bacterial communities in the Jurassic Navajo Sandstones play an important ecological role in this ecosystem. Developing a better understanding of the role of these cryptoendolithic communities required a deeper knowledge of the microbial diversity present. We analyzed the bacterial diversity in eight sandstones samples from several microgeological features associated with a large sandstone dome. Cryptoendolithic bacterial diversity is clustered into three distinct groups which correlated with topography, suggesting the duration of water retention might be a factor. Comparisons of diversity between each cluster showed that a core bacterial community exists in this habitat. The overall bacterial community structure was dominated by Cyanobacteria, Proteobacteria, Bacteroidetes, and Actinobacteria. The most prevalent genera in cyanobacteria were Leptolyngbya, Chroococcidiopsis, and unclassified cyanobacteria accounting for the bulk of cyanobacterial sequences. Within the Proteobacteria, Alphaproteobacteria were the largest class detected, with members of the Acetobacteraceae, particularly the genus Acidiphilium, being the most abundant. Acidiphilium spp. are capable of aerobic ferric iron reduction under moderately acidic conditions, explaining the high levels of iron (II) in this system. This study highlights the extent of unexplored bacterial diversity in this habitat system and sets the premise for elaborating on the ecological function of cryptoendolithic communities.
机译：侏罗纪纳瓦霍砂岩中的隐岩层细菌群落在该生态系统中起着重要的生态作用。要更好地了解这些隐岩层社区的作用，就需要对所存在的微生物多样性有更深入的了解。我们从与大型砂岩穹顶相关的几种微观地质特征分析了八个砂岩样品中的细菌多样性。隐内皮细菌的多样性被分为与地形相关的三个不同的组，这表明保水的持续时间可能是一个因素。比较每个簇之间的多样性，表明该栖息地中存在一个核心细菌群落。总体细菌群落结构主要由蓝细菌，变形杆菌，拟杆菌和放线杆菌组成。蓝细菌中最普遍的属是钩端螺旋体，蓝球菌和未分类的蓝细菌，它们占了蓝细菌序列的大部分。在变形杆菌中，丙酸杆菌是检测到的最大类别，其中醋杆菌科的成员，特别是嗜酸杆菌属的成员最多。嗜酸菌属能够在中等酸性条件下还原好氧三价铁，这说明该系统中的铁含量很高。这项研究突出了该生境系统中尚未开发的细菌多样性的程度，并为阐述隐岩质群落的生态功能奠定了前提。

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