Fig. 5: Phycosphere pH and consequences for local Fe speciation and its availability to phytoplankton. | The ISME Journal

Fig. 5: Phycosphere pH and consequences for local Fe speciation and its availability to phytoplankton.

From: Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation

Fig. 5: Phycosphere pH and consequences for local Fe speciation and its availability to phytoplankton.

Possible impact of an increase of pH in the phycosphere driven by algal uptake of CO2 and extracellular enzymatic transformation of HCO3− and a pH decrease driven by CO2 release from the phytoplankton cell or associated bacteria on Fe speciation and its availability to marine phytoplankton, which influence biogeochemical cycles of C, N, Si, and trace elements in the oceans. Specifically, Fe bioavailability may be significantly altered, as concentrations of inorganic Fe species (Fe(III)’), carbonate-coordinated Fe(III) uptake and/or organic Fe complexes (Fe-DOM and Fe-siderophores) change in the phycosphere. eCA extracellular carbonic anhydrase.

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