Temperature and pH control on lipid composition of silica sinters from diverse hot springs in the Taupo Volcanic Zone, New Zealand.
Temperature and pH control on lipid composition of silica sinters from diverse hot springs in the Taupo Volcanic Zone, New Zealand.
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DOI：
10.1007/s00792-014-0719-9
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发表时间：
2015-03
期刊：
影响因子：
2.9
通讯作者：
Pancost, Richard D.
中科院分区：
文献类型：
--
作者：
Kaur, Gurpreet;Mountain, Bruce W.;Stott, Matthew B.;Hopmans, Ellen C.;Pancost, Richard D.
微生物对极端环境的适应，包括地热环境中典型的高温和低pH值条件，在天体生物学和生命起源研究中具有重要意义。保存在与六个地热区在陶波火山区的二氧化硅矿床的脂质生物标志物进行了调查和脂质组成的变化作为温度和pH值的函数进行了评估。脂质分析揭示了高度可变的丰度和分布，反映了社区组成以及适应极端的pH值和温度。生物标志物分布揭示了三个不同的微生物组合在整个网站：第一个在香槟池和环路，第二个在Orakei Korako，Opaheke和Ngatamariki，第三个在Rotokawa。类似的脂质分布中观察到烧结从物理化学类似的弹簧。此外，脂质分布和地热条件之间的相关性进行了观察。古菌与细菌二醚丰度的比率、细菌二醚平均链长、GDGT环化程度以及C31和C32霍烷酸指数通常随温度而增加。在较低的pH值下，古菌与细菌二醚的比率、GDGT环化程度以及C31和C32的霍烷酸指数通常较高。脂肪酸分布随温度或pH值的变化趋势不明显，可能反映了由于种群影响而导致的叠印。
Microbial adaptations to environmental extremes, including high temperature and low pH conditions typical of geothermal settings, are of interest in astrobiology and origin of life investigations. The lipid biomarkers preserved in silica deposits associated with six geothermal areas in the Taupo Volcanic Zone were investigated and variations in lipid composition as a function of temperature and pH were assessed. Lipid analyses reveal highly variable abundances and distributions, reflecting community composition as well as adaptations to extremes of pH and temperature. Biomarker profiles reveal three distinct microbial assemblages across the sites: the first in Champagne Pool and Loop Road, the second in Orakei Korako, Opaheke and Ngatamariki, and the third in Rotokawa. Similar lipid distributions are observed in sinters from physicochemically similar springs. Furthermore, correlation between lipid distributions and geothermal conditions is observed. The ratio of archaeol to bacterial diether abundance, bacterial diether average chain length, degree of GDGT cyclisation and C31 and C32 hopanoic acid indices typically increase with temperature. At lower pH, the ratio of archaeol to bacterial diethers, degree of GDGT cyclisation and C31 and C32 hopanoic acid indices are typically higher. No trends in fatty acid distributions with temperature or pH are evident, likely reflecting overprinting due to population influences.
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