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Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean
Across the Southern Ocean, phytoplankton growth is governed by iron and light, while bacterial growth is regulated by iron and labile dissolved organic carbon (LDOC). We use a mechanistic model to examine how competition for iron between phytoplankton and bacteria responds to changes in iron, light,...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ https://www.ncbi.nlm.nih.gov/pubmed/33518833 http://dx.doi.org/10.1029/2020GL088369 |
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author | Ratnarajah, Lavenia Blain, Stéphane Boyd, Philip W. Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro |
author_facet | Ratnarajah, Lavenia Blain, Stéphane Boyd, Philip W. Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro |
author_sort | Ratnarajah, Lavenia |
collection | PubMed |
description | Across the Southern Ocean, phytoplankton growth is governed by iron and light, while bacterial growth is regulated by iron and labile dissolved organic carbon (LDOC). We use a mechanistic model to examine how competition for iron between phytoplankton and bacteria responds to changes in iron, light, and LDOC. Consistent with experimental evidence, increasing iron and light encourages phytoplankton dominance, while increasing LDOC and decreasing light favors bacterial dominance. Under elevated LDOC, bacteria can outcompete phytoplankton for iron, most easily under lower iron. Simulations reveal that bacteria are major iron consumers and suggest that luxury storage plays a key role in competitive iron uptake. Under seasonal conditions typical of the Southern Ocean, sources of LDOC besides phytoplankton exudation modulate the strength of competitive interactions. Continued investigations on the competitive fitness of bacteria in driving changes in primary production in iron‐limited systems will be invaluable in refining these results. |
format | Online Article Text |
id | pubmed-7816276 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-78162762021-01-27 Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean Ratnarajah, Lavenia Blain, Stéphane Boyd, Philip W. Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro Geophys Res Lett Research Letter Across the Southern Ocean, phytoplankton growth is governed by iron and light, while bacterial growth is regulated by iron and labile dissolved organic carbon (LDOC). We use a mechanistic model to examine how competition for iron between phytoplankton and bacteria responds to changes in iron, light, and LDOC. Consistent with experimental evidence, increasing iron and light encourages phytoplankton dominance, while increasing LDOC and decreasing light favors bacterial dominance. Under elevated LDOC, bacteria can outcompete phytoplankton for iron, most easily under lower iron. Simulations reveal that bacteria are major iron consumers and suggest that luxury storage plays a key role in competitive iron uptake. Under seasonal conditions typical of the Southern Ocean, sources of LDOC besides phytoplankton exudation modulate the strength of competitive interactions. Continued investigations on the competitive fitness of bacteria in driving changes in primary production in iron‐limited systems will be invaluable in refining these results. John Wiley and Sons Inc. 2021-01-12 2021-01-16 /pmc/articles/PMC7816276/ /pubmed/33518833 http://dx.doi.org/10.1029/2020GL088369 Text en © 2020 The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Letter Ratnarajah, Lavenia Blain, Stéphane Boyd, Philip W. Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title | Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title_full | Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title_fullStr | Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title_full_unstemmed | Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title_short | Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
title_sort | resource colimitation drives competition between phytoplankton and bacteria in the southern ocean |
topic | Research Letter |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ https://www.ncbi.nlm.nih.gov/pubmed/33518833 http://dx.doi.org/10.1029/2020GL088369 |
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