globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2843
论文题名:
Metabolism in anoxic permeable sediments is dominated by eukaryotic dark fermentation
作者: Bourke M.F.; Marriott P.J.; Glud R.N.; Hasler-Sheetal H.; Kamalanathan M.; Beardall J.; Greening C.; Cook P.L.M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:1
起始页码: 30
结束页码: 35
语种: 英语
Scopus关键词: anoxic conditions ; anoxic sediment ; antibiotics ; biogeochemical cycle ; continental shelf ; diatom ; dissolved inorganic carbon ; eukaryote ; fermentation ; green alga ; metabolism ; microalga ; organic matter ; Bacillariophyta ; Eukaryota ; Fragilariopsis ; Pyramimonas
英文摘要: Permeable sediments are common across continental shelves and are critical contributors to marine biogeochemical cycling. Organic matter in permeable sediments is dominated by microalgae, which as eukaryotes have different anaerobic metabolic pathways to bacteria and archaea. Here we present analyses of flow-through reactor experiments showing that dissolved inorganic carbon is produced predominantly as a result of anaerobic eukaryotic metabolic activity. In our experiments, anaerobic production of dissolved inorganic carbon was consistently accompanied by large dissolved H 2 production rates, suggesting the presence of fermentation. The production of both dissolved inorganic carbon and H 2 persisted following administration of broad spectrum bactericidal antibiotics, but ceased following treatment with metronidazole. Metronidazole inhibits the ferredoxin/hydrogenase pathway of fermentative eukaryotic H 2 production, suggesting that pathway as the source of H 2 and dissolved inorganic carbon production. Metabolomic analysis showed large increases in lipid production at the onset of anoxia, consistent with documented pathways of anoxic dark fermentation in microalgae. Cell counts revealed a predominance of microalgae in the sediments. H 2 production was observed in dark anoxic cultures of diatoms (Fragilariopsis sp.) and a chlorophyte (Pyramimonas) isolated from the study site, substantiating the hypothesis that microalgae undertake fermentation. We conclude that microalgal dark fermentation could be an important energy-conserving pathway in permeable sediments. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105864
Appears in Collections:气候减缓与适应
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作者单位: Water Studies Centre, School of Chemistry, Monash University, Wellington Road, Clayton, VIC, Australia; Australian Centre for Research on Separation Science, School of Chemistry, Monash University, Wellington Road, Clayton, VIC, Australia; University of Southern Denmark, Nordic Centre for Earth Evolution, Odense, Denmark; Scottish Association for Marine Science, Oban, United Kingdom; University of Aarhus, Arctic Research Centre, Aarhus, Denmark; University of Southern Denmark, Villum Center for Bioanalytical Sciences, Odense, Denmark; Department of Marine Biology, Texas A and M University, Galveston, TX, United States; School of Biological Sciences, Monash University, Clayton, VIC, Australia

Recommended Citation:
Bourke M.F.,Marriott P.J.,Glud R.N.,et al. Metabolism in anoxic permeable sediments is dominated by eukaryotic dark fermentation[J]. Nature Geoscience,2017-01-01,10(1)
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