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Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake

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 disper...

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Autores principales: Saeed, H., Hartland, A., Lehto, N. J., Baalousha, M., Sikder, M., Sandwell, D., Mucalo, M., Hamilton, D. P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288117/
https://www.ncbi.nlm.nih.gov/pubmed/30531915
http://dx.doi.org/10.1038/s41598-018-36103-x
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author Saeed, H.
Hartland, A.
Lehto, N. J.
Baalousha, M.
Sikder, M.
Sandwell, D.
Mucalo, M.
Hamilton, D. P.
author_facet Saeed, H.
Hartland, A.
Lehto, N. J.
Baalousha, M.
Sikder, M.
Sandwell, D.
Mucalo, M.
Hamilton, D. P.
author_sort Saeed, H.
collection PubMed
description 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 diffusive gradients in thin films (DGT) and ultrafiltration 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 > ~5 nm < ~20 nm) in both oxic epilimnetic and anaerobic hypolimnetic waters, but they were both DGT-labile under sub-oxic conditions, consistent with diffusion and dissolution of Fe-and-P-bearing colloids within the DGT diffusive gel. During peak stratification, increases in Fe and P bioavailability were spatially and temporally coincident with Fe nanoparticle dissolution and the formation of a deep chlorophyll maximum at 5–8 m 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 influence on phytoplankton community dynamics.
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spelling pubmed-62881172018-12-19 Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake Saeed, H. Hartland, A. Lehto, N. J. Baalousha, M. Sikder, M. Sandwell, D. Mucalo, M. Hamilton, D. P. Sci Rep Article 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 diffusive gradients in thin films (DGT) and ultrafiltration 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 > ~5 nm < ~20 nm) in both oxic epilimnetic and anaerobic hypolimnetic waters, but they were both DGT-labile under sub-oxic conditions, consistent with diffusion and dissolution of Fe-and-P-bearing colloids within the DGT diffusive gel. During peak stratification, increases in Fe and P bioavailability were spatially and temporally coincident with Fe nanoparticle dissolution and the formation of a deep chlorophyll maximum at 5–8 m 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 influence on phytoplankton community dynamics. Nature Publishing Group UK 2018-12-10 /pmc/articles/PMC6288117/ /pubmed/30531915 http://dx.doi.org/10.1038/s41598-018-36103-x Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Saeed, H.
Hartland, A.
Lehto, N. J.
Baalousha, M.
Sikder, M.
Sandwell, D.
Mucalo, M.
Hamilton, D. P.
Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title_full Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title_fullStr Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title_full_unstemmed Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title_short Regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
title_sort regulation of phosphorus bioavailability by iron nanoparticles in a monomictic lake
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6288117/
https://www.ncbi.nlm.nih.gov/pubmed/30531915
http://dx.doi.org/10.1038/s41598-018-36103-x
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