Journal
REGIONAL STUDIES IN MARINE SCIENCE
Volume 35, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.rsma.2020.101106
Keywords
Trichodesmium; Unicellular nitrogen-fixing cyanobacteria; nifH; Mesoscale eddy; Nitrogen fixation; South China Sea
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Funding
- Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory, China (Guangzhou) [GML2019ZD0401]
- Guangdong marine economy promotion projects Fund, China [GDOE[2019]A32]
- National Natural Science Foundation of China [41806198, 31971432]
- Science and Technology Planning Project of Guangdong Province, China [2017B030314052]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515010896]
- Fund of Key Laboratory of Open-Sea Fishery Development, China [LOF 2018-04]
- Ministry of Agriculture and Rural Affairs, P. R. China
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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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