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Symbiotic unicellular cyanobacteria fix nitrogen in the Arctic Ocean
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Journal Article
Symbiotic unicellular cyanobacteria fix nitrogen in the Arctic Ocean
2018
Overview
Biological dinitrogen (N₂) fixation is an important source of nitrogen (N) in low-latitude open oceans. The unusual N₂-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 15N₂ uptake into UCYN-A/haptophyte symbiosis and found that UCYN-A strains identical to low-latitude strains are fixing N₂ in the Bering and Chukchi Seas, at rates comparable to subtropical waters. These results show definitively that cyanobacterial N₂ fixation is not constrained to subtropical waters, challenging paradigms and models of global N₂ fixation. The Arctic is particularly sensitive to climate change, and N₂ fixation may increase in Arctic waters under future climate scenarios.
Publisher
National Academy of Sciences
Subject
