期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 52, 页码 13371-13375出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1813658115
关键词
nitrogen fixation; marine microbiology; Arctic; cyanobacteria; nanoSIMS
资金
- National Science Foundation Award from the Office of Polar Programs (OPP) [1503614]
- Division of Ocean Sciences [1241093, 1559152, OPP-1504307]
- Simons Foundation Simons Collaboration on Ocean Processes and Ecology (SCOPE) [329108]
- Stanford Nano Shared Facility [ECCS-1542152]
- Directorate For Geosciences [1503614] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1559152, 1241093] Funding Source: National Science Foundation
- Office of Polar Programs (OPP) [1503614] Funding Source: National Science Foundation
Biological dinitrogen (N-2) fixation is an important source of nitrogen (N) in low-latitude open oceans. The unusual N-2-fixing unicellular cyanobacteria (UCYN-A)/haptophyte symbiosis has been found in an increasing number of unexpected environments, including northern waters of the Danish Straight and Bering and Chukchi Seas. We used nanoscale secondary ion mass spectrometry (nanoSIMS) to measure N-15(2) uptake into UCYN-A/haptophyte symbiosis and found that UCYN-A strains identical to low-latitude strains are fixing N-2 in the Bering and Chukchi Seas, at rates comparable to subtropical waters. These results show definitively that cyanobacterial N-2 fixation is not constrained to subtropical waters, challenging paradigms and models of global N-2 fixation. The Arctic is particularly sensitive to climate change, and N-2 fixation may increase in Arctic waters under future climate scenarios.
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