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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Published in:Global Biogeochemical Cycles
Main Authors: Hawco, Nicholas J., Tagliabue, Alessandro, Twining, Benjamin S.
Format: Text
Language:English
Published: John Wiley and Sons Inc. 2022
Subjects:
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10078217/
https://doi.org/10.1029/2022GB007382
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spelling 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
institution Open Polar
collection PubMed Central (PMC)
op_collection_id ftpubmed
language English
topic Research Article
spellingShingle Research Article
Hawco, Nicholas J.
Tagliabue, Alessandro
Twining, Benjamin S.
Manganese Limitation of Phytoplankton Physiology and Productivity in the Southern Ocean
topic_facet 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
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