High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom
Little is known about the bioavailability of iron (Fe) in natural dusts and the impact of dustmineralogy on Fe utilization by photosynthetic organisms. Variation in the supply of bioavailable Fe to the ocean has the potential to influence the global carbon cycle by modulating primary production in t...
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ftunivchile:oai:repositorio.uchile.cl:2250/149582 2023-05-15T18:24:42+02:00 High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom Shoenfelt, Elizabeth M. Sun, Jing Winckler, Gisela Kaplan, Michael R. Borunda, Alejandra L. Farrell, Kayla R. Moreno Moncada, Patricio Gaiero, Diego M. Recasens, Cristina Sambrotto, Raymond N. Bostick, Benjamin C. 2017 application/pdf https://doi.org/10.1126/sciadv.1700314 https://repositorio.uchile.cl/handle/2250/149582 en eng American Association for the Advancement of Science Sci. Adv. 2017;3: e1700314 doi:10.1126/sciadv.1700314 https://repositorio.uchile.cl/handle/2250/149582 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Science Advances Artículo de revista 2017 ftunivchile https://doi.org/10.1126/sciadv.1700314 2023-01-29T00:51:35Z Little is known about the bioavailability of iron (Fe) in natural dusts and the impact of dustmineralogy on Fe utilization by photosynthetic organisms. Variation in the supply of bioavailable Fe to the ocean has the potential to influence the global carbon cycle by modulating primary production in the Southern Ocean. Much of the dust deposited across the Southern Ocean is sourced from South America, particularly Patagonia, where the waxing and waning of past and present glaciers generate fresh glaciogenic material that contrasts with aged and chemically weathered nonglaciogenic sediments. We show that these two potential sources of modern-day dust are mineralogically distinct, where glaciogenic dust sources contain mostly Fe(II)-rich primary silicate minerals, and nearby nonglaciogenic dust sources contain mostly Fe(III)-rich oxyhydroxide and Fe(III) silicate weathering products. In laboratory culture experiments, Phaeodactylum tricornutum, a well-studied coastalmodel diatom, grows more rapidly, and with higher photosynthetic efficiency, with input of glaciogenic particulates compared to that of nonglaciogenic particulates due to these differences in Fe mineralogy. Monod nutrient accessibility models fit to our data suggest that particulate Fe(II) content, rather than abiotic solubility, controls the Fe bioavailability in our Fe fertilization experiments. Thus, it is possible for this diatom to access particulate Fe in dusts by another mechanism besides uptake of unchelated Fe (Fe') dissolved from particles into the bulk solution. If this capability is widespread in the Southern Ocean, then dusts deposited to the Southern Ocean in cold glacial periods are likely more bioavailable than those deposited in warm interglacial periods. NSF GRFP DGE-11-44155 Lamont-Doherty Earth Observatory Climate Center U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences DE-AC02-76SF00515 Article in Journal/Newspaper Southern Ocean Universidad de Chile: Repositorio académico Southern Ocean Patagonia Science Advances 3 6 e1700314 |
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Open Polar |
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Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
description |
Little is known about the bioavailability of iron (Fe) in natural dusts and the impact of dustmineralogy on Fe utilization by photosynthetic organisms. Variation in the supply of bioavailable Fe to the ocean has the potential to influence the global carbon cycle by modulating primary production in the Southern Ocean. Much of the dust deposited across the Southern Ocean is sourced from South America, particularly Patagonia, where the waxing and waning of past and present glaciers generate fresh glaciogenic material that contrasts with aged and chemically weathered nonglaciogenic sediments. We show that these two potential sources of modern-day dust are mineralogically distinct, where glaciogenic dust sources contain mostly Fe(II)-rich primary silicate minerals, and nearby nonglaciogenic dust sources contain mostly Fe(III)-rich oxyhydroxide and Fe(III) silicate weathering products. In laboratory culture experiments, Phaeodactylum tricornutum, a well-studied coastalmodel diatom, grows more rapidly, and with higher photosynthetic efficiency, with input of glaciogenic particulates compared to that of nonglaciogenic particulates due to these differences in Fe mineralogy. Monod nutrient accessibility models fit to our data suggest that particulate Fe(II) content, rather than abiotic solubility, controls the Fe bioavailability in our Fe fertilization experiments. Thus, it is possible for this diatom to access particulate Fe in dusts by another mechanism besides uptake of unchelated Fe (Fe') dissolved from particles into the bulk solution. If this capability is widespread in the Southern Ocean, then dusts deposited to the Southern Ocean in cold glacial periods are likely more bioavailable than those deposited in warm interglacial periods. NSF GRFP DGE-11-44155 Lamont-Doherty Earth Observatory Climate Center U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences DE-AC02-76SF00515 |
format |
Article in Journal/Newspaper |
author |
Shoenfelt, Elizabeth M. Sun, Jing Winckler, Gisela Kaplan, Michael R. Borunda, Alejandra L. Farrell, Kayla R. Moreno Moncada, Patricio Gaiero, Diego M. Recasens, Cristina Sambrotto, Raymond N. Bostick, Benjamin C. |
spellingShingle |
Shoenfelt, Elizabeth M. Sun, Jing Winckler, Gisela Kaplan, Michael R. Borunda, Alejandra L. Farrell, Kayla R. Moreno Moncada, Patricio Gaiero, Diego M. Recasens, Cristina Sambrotto, Raymond N. Bostick, Benjamin C. High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
author_facet |
Shoenfelt, Elizabeth M. Sun, Jing Winckler, Gisela Kaplan, Michael R. Borunda, Alejandra L. Farrell, Kayla R. Moreno Moncada, Patricio Gaiero, Diego M. Recasens, Cristina Sambrotto, Raymond N. Bostick, Benjamin C. |
author_sort |
Shoenfelt, Elizabeth M. |
title |
High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
title_short |
High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
title_full |
High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
title_fullStr |
High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
title_full_unstemmed |
High particulate iron(II) content in glacially sourced dusts enhances productivity of a model diatom |
title_sort |
high particulate iron(ii) content in glacially sourced dusts enhances productivity of a model diatom |
publisher |
American Association for the Advancement of Science |
publishDate |
2017 |
url |
https://doi.org/10.1126/sciadv.1700314 https://repositorio.uchile.cl/handle/2250/149582 |
geographic |
Southern Ocean Patagonia |
geographic_facet |
Southern Ocean Patagonia |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Science Advances |
op_relation |
Sci. Adv. 2017;3: e1700314 doi:10.1126/sciadv.1700314 https://repositorio.uchile.cl/handle/2250/149582 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1126/sciadv.1700314 |
container_title |
Science Advances |
container_volume |
3 |
container_issue |
6 |
container_start_page |
e1700314 |
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1766205515685167104 |