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首页> 外文期刊>Microbes and Environments >Vertical Distribution and Diversity of Phototrophic Bacteria within a Hot Spring Microbial Mat (Nakabusa Hot Springs, Japan)
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Vertical Distribution and Diversity of Phototrophic Bacteria within a Hot Spring Microbial Mat (Nakabusa Hot Springs, Japan)

机译：热弹簧微生物垫中的光养细菌的垂直分布和多样性（日本Nakabusa Hot Springs）

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摘要

Phototrophic microbial mats are assemblages of vertically layered microbial populations dominated by photosynthetic microorganisms. In order to elucidate the vertical distribution and diversity of phototrophic microorganisms in a hot spring-associated microbial mat in Nakabusa (Japan), we analyzed the 16S rRNA gene amplicon sequences of the microbial mat separated into five depth horizons, and correlated them with microsensor measurements of O-2 and spectral scalar irradiance. A stable core community and high diversity of phototrophic organisms dominated by the filamentous anoxygenic phototrophs, Rosettlexus castenholzii and Chloroflexus aggregans were identified together with the spectral signatures of bacteriochlorophylls (BChls) a and c absorption in all mat layers. In the upper mat layers, a high abundance of cyanobacteria (Thermosynechococcus sp.) correlated with strong spectral signatures of chlorophyll a and phycobiliprotein absorption near the surface in a zone of high O-2 concentrations during the day. Deeper mat layers were dominated by uncultured chemotrophic Chlorobi such as the novel putatively sulfate-reducing "Ca. Thermoncrobacter sp.", which showed increasing abundance with depth correlating with low O-2 in these layers enabling anaerobic metabolism. Oxygen tolerance and requirements for the novel phototroph "Ca. Chloroanaerofilum sp." and the uncultured chemotrophic Armatimonadetes member type OS-L detected in Nakabusa hot springs, Japan appeared to differ from previously suggested lifestyles for close relatives identified in hot springs in Yellowstone National Park, USA. The present study identified various microenvironmental gradients and niche differentiation enabling the co-existence of diverse chlorophototrophs in metabolically diverse communities in hot springs.
机译：光致微生物垫是由光合微生物主导的垂直分层微生物种群的组装。为了阐明Nakabusa（日本）中的热弹簧相关微生物垫中的光养微生物的垂直分布和多样性，我们分析了微生物垫的16S rRNA基因扩增子序列分成五个深度视野，并将它们与微传感器测量相关联O-2和光谱标量辐照度。稳定的核心群落和由丝状氧氧基光营，罗塞列斯州葡萄牙和氯昔尔氏菌和氯昔斯植体的高辅助生物体与所有垫层中的菌肤氯苯（BCHLS）A和C吸收的光谱特征一起鉴定。在上层垫层中，高丰度的蓝藻（Thermosynechococcus Sp。）与白天高O-2浓度区域的表面附近的叶绿素A和植物胆蛋白吸收的强光谱签名相关。更深的垫子层由未培养的嗜培养基氯（氯苯，如新颖的硫酸盐还原的“Ca.Thermoncrobacters Sp”。，其显示在这些层中与低O-2的深度相关的丰富，从而实现厌氧代谢。新型光饮“Ca.Choroanaerofilum sp”的氧气耐受和要求。在Nakabusa Hot Springs中检测到的未培养的趋化学辅助armatimonaadetes成员型OS-L似乎与先前建议在美国黄石国家公园的温泉中鉴定的近亲的近亲生活方式不同。本研究鉴定了各种微环境梯度和利基分化，使得在热弹簧中代谢多样化的社区中的各种血球萎缩的共存。

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