Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean
Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constraine...
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ftpubmed:oai:pubmedcentral.nih.gov:10078217 2023-05-15T14:13:48+02:00 Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean Hawco, Nicholas J. Tagliabue, Alessandro Twining, Benjamin S. 2022-11-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078217/ https://doi.org/10.1029/2022GB007382 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078217/ http://dx.doi.org/10.1029/2022GB007382 © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. Global Biogeochem Cycles Research Article Text 2022 ftpubmed https://doi.org/10.1029/2022GB007382 2023-04-09T01:08:14Z Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constrained and direct manganese limitation of the marine carbon cycle has been neglected by ocean models. Here, using available observations, we develop a new global biogeochemical model and find that phytoplankton in over half of the Southern Ocean cannot attain maximal growth rates because of manganese deficiency. Manganese limitation is most extensive in austral spring and depends on phytoplankton traits related to the size of photosynthetic antennae and the inhibition of manganese uptake by high zinc concentrations in Antarctic waters. Importantly, manganese limitation expands under the increased iron supply of past glacial periods, reducing the response of the biological carbon pump. Overall, these model experiments describe a mosaic of controls on Southern Ocean productivity that emerge from the interplay of light, iron, manganese and zinc, shaping the evolution of Antarctic phytoplankton since the opening of the Drake Passage. Text Antarc* Antarctic Drake Passage Southern Ocean PubMed Central (PMC) Antarctic Austral Drake Passage Southern Ocean Global Biogeochemical Cycles 36 11 |
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Research Article |
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Research Article Hawco, Nicholas J. Tagliabue, Alessandro Twining, Benjamin S. Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
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Research Article |
description |
Although iron and light are understood to regulate the Southern Ocean biological carbon pump, observations have also indicated a possible role for manganese. Low concentrations in Southern Ocean surface waters suggest manganese limitation is possible, but its spatial extent remains poorly constrained and direct manganese limitation of the marine carbon cycle has been neglected by ocean models. Here, using available observations, we develop a new global biogeochemical model and find that phytoplankton in over half of the Southern Ocean cannot attain maximal growth rates because of manganese deficiency. Manganese limitation is most extensive in austral spring and depends on phytoplankton traits related to the size of photosynthetic antennae and the inhibition of manganese uptake by high zinc concentrations in Antarctic waters. Importantly, manganese limitation expands under the increased iron supply of past glacial periods, reducing the response of the biological carbon pump. Overall, these model experiments describe a mosaic of controls on Southern Ocean productivity that emerge from the interplay of light, iron, manganese and zinc, shaping the evolution of Antarctic phytoplankton since the opening of the Drake Passage. |
format |
Text |
author |
Hawco, Nicholas J. Tagliabue, Alessandro Twining, Benjamin S. |
author_facet |
Hawco, Nicholas J. Tagliabue, Alessandro Twining, Benjamin S. |
author_sort |
Hawco, Nicholas J. |
title |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_short |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_full |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_fullStr |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_full_unstemmed |
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean |
title_sort |
manganese limitation of phytoplankton physiology and productivity in the southern ocean |
publisher |
John Wiley and Sons Inc. |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078217/ https://doi.org/10.1029/2022GB007382 |
geographic |
Antarctic Austral Drake Passage Southern Ocean |
geographic_facet |
Antarctic Austral Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage Southern Ocean |
op_source |
Global Biogeochem Cycles |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078217/ http://dx.doi.org/10.1029/2022GB007382 |
op_rights |
© 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1029/2022GB007382 |
container_title |
Global Biogeochemical Cycles |
container_volume |
36 |
container_issue |
11 |
_version_ |
1766286343386693632 |