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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Prokaryotic diversity pattern in high-altitude ecosystems of the Chilean Altiplano
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Prokaryotic diversity pattern in high-altitude ecosystems of the Chilean Altiplano

机译：智利高原高原生态系统中的原核生物多样性模式

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The Chilean Altiplano is the westernmost part of a large volcanic-sedimentary plateau in the central Andes. High solar irradiance and rapid increase of temperature have contributed to make it a hot spot of global climatic change. In this study, we describe microbial diversity in the summit lake of the Simba volcano (5,870 m) and the evaporitic basins of Salar de Aguas Calientes (4,200 m) and Laguna Leja (4,325 m) using both culture and culture-independent methods. The results obtained were analyzed together with available information from related environments to describe the traits of the microbial community driven by main environmental factors. Isolated cultures exhibit high resistance to all three types of UV radiation, further supporting the adaptation of microorganisms to the high altitude environment. The microbial community structures at Salar de Aguas Calientes and Laguna Leja are similar to those from other saline systems and cold environments where Bacteroidetes is the major bacterial group. The abundance of sequences related to alphaproteobacteria and methanogenic populations likely reflects the importance of aerobic anoxigenic phothosynthesis and the cycling of one-carbon compounds in the high altitude lake ecosystems. Geochemistry and microbial communities at Simba as well as those reported in the Licancabur summit lake provide evidence for sulfur-rich environments but under different conditions. Those differences between neighboring mountain lake ecosystems highlight the effect of volcanic activity on microbial communities. The hypothetical ecosystem model described in this work provides a clue to follow the microbial community responses to geophysical environment coupled with rapid climate change.
机译：智利的高原是安第斯山脉中部大型火山沉积高原的最西端。高的太阳辐射和温度的迅速升高使它成为全球气候变化的热点。在这项研究中，我们使用文化和与文化无关的方法描述了Simba火山顶峰湖（5,870 m）和Salar de Aguas Calientes（4,200 m）和Laguna Leja（4,325 m）的蒸发盆地中的微生物多样性。将获得的结果与相关环境中的可用信息一起进行分析，以描述由主要环境因素驱动的微生物群落的特征。分离的培养物对所有三种类型的紫外线都有很高的抵抗力，进一步支持了微生物适应高海拔环境。 Salar de Aguas Calientes和Laguna Leja的微生物群落结构与其他以盐杆菌和细菌为主要细菌的盐分系统和寒冷环境中的微生物群落结构相似。与α变形杆菌和产甲烷菌种群有关的序列的丰富性可能反映了有氧厌氧性光合作用和高海拔湖泊生态系统中一碳化合物循环的重要性。 Simba的地球化学和微生物群落以及Licancabur顶峰湖的报道提供了富硫环境但在不同条件下的证据。邻近的高山湖泊生态系统之间的差异突出了火山活动对微生物群落的影响。这项工作中描述的假设生态系统模型为遵循微生物群落对地球物理环境以及快速气候变化的反应提供了线索。

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