globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1917277117
论文题名:
Microbial feedbacks optimize ocean iron availability
作者: Lauderdale J.M.; Braakman R.; Forget G.; Dutkiewicz S.; Follows M.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:9
起始页码: 4842
结束页码: 4849
语种: 英语
英文关键词: Colimitation ; Dissolved iron ; Macronutrients ; Ocean productivity ; Organic ligands
Scopus关键词: iron ; ligand ; sea water ; trace element ; ferric ion ; iron ; iron chelating agent ; sea water ; siderophore ; Article ; biogeochemical cycling ; controlled study ; iron cycling ; ligand binding ; macronutrient ; marine environment ; metal binding ; microbial activity ; nonhuman ; positive feedback ; priority journal ; sea ; simulation ; source sink relationship ; bacterium ; biological model ; chemistry ; computer simulation ; cyanobacterium ; feedback system ; metabolism ; microbiology ; photochemistry ; Bacteria ; Computer Simulation ; Cyanobacteria ; Feedback ; Ferric Compounds ; Iron ; Iron Chelating Agents ; Ligands ; Micronutrients ; Models, Biological ; Nutrients ; Oceans and Seas ; Photochemistry ; Seawater ; Siderophores ; Water Microbiology
英文摘要: Iron is the limiting factor for biological production over a large fraction of the surface ocean because free iron is rapidly scavenged or precipitated under aerobic conditions. Standing stocks of dissolved iron are maintained by association with organic molecules (ligands) produced by biological processes. We hypothesize a positive feedback between iron cycling, microbial activity, and ligand abundance: External iron input fuels microbial production, creating organic ligands that support more iron in seawater, leading to further macronutrient consumption until other microbial requirements such as macronutrients or light become limiting, and additional iron no longer increases productivity. This feedback emerges in numerical simulations of the coupled marine cycles of macronutrients and iron that resolve the dynamic microbial production and loss of iron-chelating ligands. The model solutions resemble modern nutrient distributions only over a finite range of prescribed ligand source/sink ratios where the model ocean is driven to global-scale colimitation by micronutrients and macronutrients and global production is maximized. We hypothesize that a global-scale selection for microbial lig- and cycling may have occurred to maintain “just enough” iron in the ocean. © 2020 National Academy of Sciences. 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/163493
Appears in Collections:气候变化与战略

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作者单位: Lauderdale, J.M., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Braakman, R., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Forget, G., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Dutkiewicz, S., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States, Center for Global Change Science, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Follows, M.J., Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

Recommended Citation:
Lauderdale J.M.,Braakman R.,Forget G.,et al. Microbial feedbacks optimize ocean iron availability[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(9)
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