Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
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Saeed, H., Hartland, A., Lehto, N. J., Baalousha, M., Sikder, M., Sandwell, D. R., … Hamilton, D. P. (2018). Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake. Scientific Reports, 8. https://doi.org/10.1038/s41598-018-36103-x
Permanent Research Commons link: https://hdl.handle.net/10289/12743
Dissolved reactive phosphorous (DRP) in lake systems is conventionally considered to predominate over other dissolved P species, however, this view neglects an important set of interactions that occurs between P and reactive iron hydroxide surfaces. This study addresses the coupling of P with dispersed iron nanoparticles in lakes, an interaction that may fundamentally alter the bioavailability of P to phytoplankton. We used difusive gradients in thin flms (DGT) and ultrafltration to study Fe-P coupling in the water column of a monomictic lake over a hydrological year. Fe and P were predominantly colloidal (particle diameters>~5nm<~20nm) in both oxic epilimnetic and anaerobic hypolimnetic waters, but they were both DGT-labile under sub-oxic conditions, consistent with difusion and dissolution of Fe-and-P-bearing colloids within the DGT difusive gel. During peak stratifcation, increases in Fe and P bioavailability were spatially and temporally coincident with Fe nanoparticle dissolution and the formation of a deep chlorophyll maximum at 5–8m depth. These results provide a window into the coupling and decoupling of P with mobile iron colloids, with implications for our understanding of the behaviour of nutrients and their infuence on phytoplankton community dynamics.
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