Assimilation of upwelled nitrate by small eukaryotes in the Sargasso Sea

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Diazotroph derived nitrogen supports diatom growth in the South West Pacific: A quantitative study using nanoSIMS (2016, methodology): “…incubation bottle were collected via filtration through precombusted GF/F filters and immediately frozen for later quantification of 15N in the total dissolved N (TDN; the sum of NO22 , NO 2 3 , NH 1 4 and DON) pool as described in Knapp et al. (2005), with amendments made by Fawcett et al. (2011).”
Depth distribution of ammonia oxidation rates and ammonia‐oxidizer community composition in the Sargasso Sea (2013, background): “…the upper water column in the summer and fall allows subsurface nitrate to mix up into the euphotic zone, where it is consumed by eukaryotic phytoplankton (Fawcett et al. 2011; Fawcett 2012), perhaps removing some of the competitive pressure between phytoplankton and ammonia oxidizers for ammonium.”