… , biovolume and distribution of symbiotic, colony-forming and particle-associated diazotrophs
at a global scale. We show that imaging and PCR-free molecular data are congruent. …

… a critical role in marine primary production, yet, our understanding of marine N2-… image
analysis pipeline in concert with mapping of molecular markers for mining >2,000,000 images …

… data to the global ocean. Remaining knowledge gaps in … [13], the molecular methods for
culture-independent quantification … imaging, confocal microscopic methods, fluorescent labeling …

… on a global scale by combining the marine and terrestrial FTRs with the distribution of
surface warming from Earth System Models (Figure 3). For a climate that reaches a global mean …

… Globally, ODZs are expanding in volume as a result of climate change 55 . These regimes
represent ideal environments for nitrogen fixers as … High-throughput molecular methods for …

… with the generally wide geographic ranges of the species in the data; (ii) species 508 are
primarily controlled by abiotic environmental factors in their global distribution (74), 509 …

… a globally distributed nifH ASV database. Together 125 the workflow and nifH ASV
database will serve as valuable community resources, fostering future investigations while 126 …

… required to scale these processes globally from either biogeochemical or biological data. …
the distributions and activities of N 2 -fixing microorganisms over the vast scales of the ocean. …

We describe diazotrophs present during a 2015 GEOTRACES expedition through the
Canadian Arctic Gateway (CAG) using nifH metabarcoding. In the less studied Labrador Sea, …

… the imaging systems we used. Besides identifying potential drivers of trait 144 distributions
in the global oceans, our results provide insights into how mesoplankton affect 145 marine …