Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1917277117 |
Microbial feedbacks optimize ocean iron availability | |
Lauderdale, Jonathan Maitland1; Braakman, Rogier1,2; Forget, Gael1; Dutkiewicz, Stephanie1,3; Follows, Michael J.1,2 | |
2020-03-03 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:9页码:4842-4849 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 ligand cycling may have occurred to maintain "just enough" iron in the ocean. |
英文关键词 | dissolved iron organic ligands ocean productivity macronutrients colimitation |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000518473500058 |
WOS关键词 | ORGANIC COMPLEXATION ; DISSOLVED IRON ; BINDING LIGANDS ; ATMOSPHERIC CO2 ; PLANKTON COMMUNITIES ; PHYTOPLANKTON BLOOM ; HUMIC SUBSTANCES ; NORTH PACIFIC ; TRACE-METALS ; NITROGEN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249590 |
专题 | 地球科学 |
作者单位 | 1.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; 2.MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA; 3.MIT, Ctr Global Change Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Lauderdale, Jonathan Maitland,Braakman, Rogier,Forget, Gael,et al. Microbial feedbacks optimize ocean iron availability[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(9):4842-4849. |
APA | Lauderdale, Jonathan Maitland,Braakman, Rogier,Forget, Gael,Dutkiewicz, Stephanie,&Follows, Michael J..(2020).Microbial feedbacks optimize ocean iron availability.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(9),4842-4849. |
MLA | Lauderdale, Jonathan Maitland,et al."Microbial feedbacks optimize ocean iron availability".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.9(2020):4842-4849. |
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