Q. Devresse et al.: Eddy-enhanced primary production sustains heterotrophic microbial activities
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Figure 4. Depth distribution of phytoplankton biomass and activity from the surface to 100 m. Chlorophyll a (Chl a; a), autotrophic pico-
and nanoplankton biomass (Aut pico-nanoplankton; b), total primary production (PPTorT; ©), dissolved primary production (PPpoc; d), and
percentage of extracellular release (PER; e). Dashed red lines show the western and eastern boundaries of the cyclonic eddy periphery. FZ
refers to frontal zone.
DOC; r = 0.61 and 0.56 , p<0.001). However, bacterial res-
piration (BR) was not correlated to any variable (p>0.05).
In the stations influenced by the eddy, PPror was pos-
itively correlated to Chl a (r= 0.55, p<0.05), whereas
PPpoc (r = 0.47, p>0.05) was not, and both were not cor-
related to the autotrophic pico- and nanoplankton biomass.
Chl a and SL-DOC were significantly correlated (r = 0.36,
p<0.001). In contrast to the stations outside the eddy, HB
was not correlated to PPrortr, PPDpoc, and SL-DOC (p>0.05)
https://doi.org/10.5194/bg-19-5199-2022
but was still strongly correlated to Chl a and autotrophic
pico- and nanoplankton biomass (r = 0.57 and 0.76, respec-
tively, p<0.001). BP, in contrast, was correlated to PPTor
and PPpoc (r = 0.63 and 0.59, respectively, p<0.05) and
strongly to Chl a (r = 0.92, p<0.001). BP correlated also
to autotrophic pico- and nanoplankton biomass and to SL-
DOC, albeit to a lesser extent (r = 0.41 and 0.43, respec-
tively, p<0.05). In contrast to stations not influenced by the
eddy, BR was strongly correlated to Chl a and SL-DOC (r =
Biogeosciences, 19. 51995219. 2022
