globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12094
Scopus记录号: 2-s2.0-84906086551
论文题名:
Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures
作者: Pagès A.; Grice K.; Ertefai T.; Skrzypek G.; Jahnert R.; Greenwood P.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期:5
起始页码: 469
结束页码: 487
语种: 英语
Scopus关键词: aliphatic hydrocarbon ; biomarker ; biomass ; cyanobacterium ; depth ; diatom ; isotopic analysis ; lipid ; microbial community ; microbial mat ; morphology ; organic geochemistry ; salinity ; seagrass ; sulfate-reducing bacterium ; tidal flat ; World Heritage Site ; Australia ; Shark Bay ; Western Australia ; Bacillariophyta ; Bacteria (microorganisms) ; Chondrichthyes ; Cyanobacteria ; biological marker ; lipid ; Australia ; cyanobacterium ; diatom ; metabolism ; microbiology ; salinity ; sediment ; Biological Markers ; Cyanobacteria ; Diatoms ; Geologic Sediments ; Lipids ; Salinity ; Western Australia
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: The present study investigated the influence of abiotic conditions on microbial mat communities from Shark Bay, a World Heritage area well known for a diverse range of extant mats presenting structural similarities with ancient stromatolites. The distributions and stable carbon isotopic values of lipid biomarkers [aliphatic hydrocarbons and polar lipid fatty acids (PLFAs)] and bulk carbon and nitrogen isotope values of biomass were analysed in four different types of mats along a tidal flat gradient to characterize the microbial communities and systematically investigate the relationship of the above parameters with water depth. Cyanobacteria were dominant in all mats, as demonstrated by the presence of diagnostic hydrocarbons (e.g. n-C17 and n-C17:1). Several subtle but important differences in lipid composition across the littoral gradient were, however, evident. For instance, the shallower mats contained a higher diatom contribution, concordant with previous mat studies from other locations (e.g. Antarctica). Conversely, the organic matter (OM) of the deeper mats showed evidence for a higher seagrass contribution [high C/N, 13C-depleted long-chain n-alkanes]. The morphological structure of the mats may have influenced CO2 diffusion leading to more 13C-enriched lipids in the shallow mats. Alternatively, changes in CO2 fixation pathways, such as increase in the acetyl COA-pathway by sulphate-reducing bacteria, could have also caused the observed shifts in δ13C values of the mats. In addition, three smooth mats from different Shark Bay sites were analysed to investigate potential functional relationship of the microbial communities with differing salinity levels. The C25:1 HBI was identified in the high salinity mat only and a lower abundance of PLFAs associated with diatoms was observed in the less saline mats, suggesting a higher abundance of diatoms at the most saline site. Furthermore, it appeared that the most and least saline mats were dominated by autotrophic biomass using different CO2 fixation pathways. © 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/85192
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作者单位: WA Organic and Isotope Geochemistry Centre, Department of Chemistry, Curtin University, Perth, WA, Australia; West Australian Biogeochemistry Centre, University of Western Australia (M090), Crawley, WA, Australia; Department of Applied Geology, Curtin University of Technology, Perth, WA, Australia; CSIRO Earth Science and Resource Engineering and Minerals Down Under National Research Flagship, Kensington, WA, Australia

Recommended Citation:
Pagès A.,Grice K.,Ertefai T.,et al. Organic geochemical studies of modern microbial mats from Shark Bay: Part I: Influence of depth and salinity on lipid biomarkers and their isotopic signatures[J]. Geobiology,2014-01-01,12(5)
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