globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12252
Scopus记录号: 2-s2.0-85031496894
论文题名:
Microbial communities and organic biomarkers in a Proterozoic-analog sinkhole
作者: Hamilton T.L.; Welander P.V.; Albrecht H.L.; Fulton J.M.; Schaperdoth I.; Bird L.R.; Summons R.E.; Freeman K.H.; Macalady J.L.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:6
起始页码: 784
结束页码: 797
语种: 英语
英文关键词: anoxygenic ; biomarkers ; Chlorobi ; Cyanobacteria ; hopanoid ; hpnP ; oxygen ; oxygenic ; photosynthesis ; pinnacle ; Proterozoic ; sinkhole ; sulfide
Scopus关键词: biomarker ; black shale ; cyanobacterium ; microbial community ; microbial mat ; photosynthesis ; Proterozoic ; seasonal variation ; sediment-water interface ; sinkhole ; sulfate-reducing bacterium ; upper ocean ; water column ; Florida [United States] ; Sarasota County ; United States ; Chlorobi ; Cyanobacteria ; Deltaproteobacteria
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Little Salt Spring (Sarasota County, FL, USA) is a sinkhole with groundwater vents at ~77 m depth. The entire water column experiences sulfidic (~50 μM) conditions seasonally, resulting in a system poised between oxic and sulfidic conditions. Red pinnacle mats occupy the sediment–water interface in the sunlit upper basin of the sinkhole, and yielded 16S rRNA gene clones affiliated with Cyanobacteria, Chlorobi, and sulfate-reducing clades of Deltaproteobacteria. Nine bacteriochlorophyll e homologues and isorenieratene indicate contributions from Chlorobi, and abundant chlorophyll a and pheophytin a are consistent with the presence of Cyanobacteria. The red pinnacle mat contains hopanoids, including 2-methyl structures that have been interpreted as biomarkers for Cyanobacteria. A single sequence of hpnP, the gene required for methylation of hopanoids at the C-2 position, was recovered in both DNA and cDNA libraries from the red pinnacle mat. The hpnP sequence was most closely related to cyanobacterial hpnP sequences, implying that Cyanobacteria are a source of 2-methyl hopanoids present in the mat. The mats are capable of light-dependent primary productivity as evidenced by 13C-bicarbonate photoassimilation. We also observed 13C-bicarbonate photoassimilation in the presence of DCMU, an inhibitor of electron transfer to Photosystem II. Our results indicate that the mats carry out light-driven primary production in the absence of oxygen production—a mechanism that may have delayed the oxygenation of the Earth's oceans and atmosphere during the Proterozoic Eon. Furthermore, our observations of the production of 2-methyl hopanoids by Cyanobacteria under conditions of low oxygen and low light are consistent with the recovery of these structures from ancient black shales as well as their paucity in modern marine environments. © 2017 The Authors. Geobiology Published by John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85034
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biological Sciences, University of Cincinnati, Cincinnati, OH, United States; Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Department of Geosciences and the Penn State Astrobiology Research Center (PSARC), The Pennsylvania State University, University Park, PA, United States; Department of Geosciences, Baylor University, Waco, TX, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States

Recommended Citation:
Hamilton T.L.,Welander P.V.,Albrecht H.L.,et al. Microbial communities and organic biomarkers in a Proterozoic-analog sinkhole[J]. Geobiology,2017-01-01,15(6)
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