globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12096
Scopus记录号: 2-s2.0-84906097024
论文题名:
Organic and mineral imprints in fossil photosynthetic mats of an East Antarctic lake
作者: Lepot K.; Compère P.; Gérard E.; Namsaraev Z.; Verleyen E.; Tavernier I.; Hodgson D.A.; Vyverman W.; Gilbert B.; Wilmotte A.; Javaux E.J.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期:5
起始页码: 424
结束页码: 450
语种: 英语
Scopus关键词: biodegradation ; calcification ; crystallization ; cyanobacterium ; food chain ; fossil record ; fossilization ; lacustrine environment ; microbial mat ; microstructure ; mineralization ; pigment ; polysaccharide ; preservation ; primary production ; Antarctica ; East Antarctica ; Lake Vostok ; Bacteria (microorganisms) ; Coccoidea ; Cyanobacteria ; Prokaryota ; Antarctica ; cyanobacterium ; fossil ; lake ; metabolism ; microbiology ; paleontology ; photosynthesis ; sediment ; time ; Antarctic Regions ; Cyanobacteria ; Fossils ; Geologic Sediments ; Lakes ; Paleontology ; Photosynthesis ; Time Factors
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: Lacustrine microbial mats in Antarctic ice-free oases are considered modern analogues of early microbial ecosystems as their primary production is generally dominated by cyanobacteria, the heterotrophic food chain typically truncated due to extreme environmental conditions, and they are geographically isolated. To better understand early fossilization and mineralization processes in this context, we studied the microstructure and chemistry of organo-mineral associations in a suite of sediments 50-4530 cal. years old from a lake in Skarvsnes, Lützow Holm Bay, East Antarctica. First, we report an exceptional preservation of fossil autotrophs and their biomolecules on millennial timescales. The pigment scytonemin is preserved inside cyanobacterial sheaths. As non-pigmented sheaths are also preserved, scytonemin likely played little role in the preservation of sheath polysaccharides, which have been cross-linked by ether bonds. Coccoids preserved thylakoids and autofluorescence of pigments such as carotenoids. This exceptional preservation of autotrophs in the fossil mats argues for limited biodegradation during and after deposition. Moreover, cell-shaped aggregates preserved sulfur-rich nanoglobules, supporting fossilization of instable intracellular byproducts of chemotrophic or phototrophic S-oxidizers. Second, we report a diversity of micro- to nanostructured CaCO3 precipitates intimately associated with extracellular polymeric substances, cyanobacteria, and/or other prokaryotes. Micro-peloids Type 1 display features that distinguish them from known carbonates crystallized in inorganic conditions: (i) Type 1A are often filled with globular nanocarbonates and/or surrounded by a fibrous fringe, (ii) Type 1B are empty and display ovoid to wrinkled fringes of nanocrystallites that can be radially oriented (fibrous or triangular) or multilayered, and (iii) all show small-size variations. Type 2 rounded carbonates 1-2 μm in diameter occurring inside autofluorescent spheres interpreted as coccoidal bacteria may represent fossils of intracellular calcification. These organo-mineral associations support organically driven nanocarbonate crystallization and stabilization, hence providing potential markers for microbial calcification in ancient rocks. © 2014 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/85187
Appears in Collections:影响、适应和脆弱性

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作者单位: Paléobiogéologie, Paléobotanique and Paléopalynologie, Département de Géologie, Université de Liège, Liège, 4000, Belgium; Géosystèmes, Université Lille 1, CNRS UMR 8217, SN5, Villeneuve d'Ascq, 59655, France; Morphologie Ultrastructurale, Département de Biologie, Ecologie et Evolution, Université de Liège, Liège, 4000, Belgium; Géobiosphère Actuelle et Primitive, Institut de Physique du Globe de Paris, CNRS UMR 7154, Université Paris Diderot, Sorbonne Paris Cité, Paris, France; Centre d'Ingénierie des Protéines, Université de Liège, Liège, 4000, Belgium; National Research Center, Kurchatov Institute, Moscow, 123182, Russian Federation; Winogradsky Institute of Microbiology RAS, Moscow, 117312, Russian Federation; Protistology and Aquatic Ecology, Ghent University, Ghent, 9000, Belgium; British Antarctic Survey, Cambridge, CB3 0ET, United Kingdom; Analytical Chemistry and Electrochemistry, Université de Liège, Liège, 4000, Belgium; Géosystèmes, Université Lille 1, CNRS UMR 8217, SN5, Villeneuve d'Ascq, 59655, France; National Research Center 'Kurchatov Institute', Moscow, Russian Federation

Recommended Citation:
Lepot K.,Compère P.,Gérard E.,et al. Organic and mineral imprints in fossil photosynthetic mats of an East Antarctic lake[J]. Geobiology,2014-01-01,12(5)
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