Effect of mesoscale eddies on diazotroph community structure and nitrogen fixation rates in the South China Sea
文献类型： 外文期刊
作者： Liu, Jiaxing 1 ; Zhou, Linbin 1 ; Li, Jiajun 2 ; Lin, Yuyang 4 ; Ke, Zhixin 1 ; Zhao, Chunyu 1 ; Liu, Huajian 1 ; Jiang, 1 ;
作者机构： 1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, Guangzhou 510301, Peoples R China
2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploit, Minist Agr, Guangzhou 510300, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China
4.Univ Queensland, Sci Fac, Sch Earth & Environm Sci, Brisbane, Qld 4072, Australia
5.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China
6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词： Trichodesmium; Unicellular nitrogen-fixing cyanobacteria; nifH; Mesoscale eddy; Nitrogen fixation; South China Sea
期刊名称：REGIONAL STUDIES IN MARINE SCIENCE （ 影响因子：1.624； 五年影响因子：1.962 ）
ISSN： 2352-4855
年卷期： 2020 年 35 卷
页码：
收录情况： SCI
摘要： Mesoscale eddies play a key role in ocean biogeochemistry, yet their effects on dinitrogen (N-2) fixation are not well understood. Using quantitative polymerase chain reaction (qPCR) and dinitrogen-15 (N-15(2)) tracer methods, we examined the abundance of nifH genes in N-2 -fixing microorganisms and N-2 fixation rates in the upper water column (0-100 m) of mesoscale eddies in the northeastern South China Sea (SCS). High N-2 fixation rates affected by an anticyclonic eddy were associated with high abundances of unicellular nitrogen-fixing cyanobacteria in groups A and B (UCYN-A, UCYN-B), while low nitrogen fixation was found in both cyclonic eddy and reference stations. The estimated N-2 fixation rates met 9% +/- 5% of the nitrogen demand for primary production affected by the anticyclonic eddy. Our results indicate that mesoscale eddies can affect nitrogen fixation through affecting nutrient availability and eddy transport, and play a crucial role in regulating N-2 fixation in the oligotrophic SCS. (C) 2020 Elsevier B.V. All rights reserved.
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