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,...
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ftpubmed:oai:pubmedcentral.nih.gov:7816276 2023-05-15T18:24:24+02:00 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 2021-01-12 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ https://doi.org/10.1029/2020GL088369 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ http://dx.doi.org/10.1029/2020GL088369 © 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. CC-BY Geophys Res Lett Research Letter Text 2021 ftpubmed https://doi.org/10.1029/2020GL088369 2021-01-31T01:30:11Z 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. Text Southern Ocean PubMed Central (PMC) Southern Ocean Geophysical Research Letters 48 1 |
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Research Letter |
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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 |
topic_facet |
Research Letter |
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 |
Text |
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 |
title |
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_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_sort |
resource colimitation drives competition between phytoplankton and bacteria in the southern ocean |
publisher |
John Wiley and Sons Inc. |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ https://doi.org/10.1029/2020GL088369 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Geophys Res Lett |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7816276/ http://dx.doi.org/10.1029/2020GL088369 |
op_rights |
© 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. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020GL088369 |
container_title |
Geophysical Research Letters |
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48 |
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1 |
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1766204896044908544 |