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,...
Published in: | Geophysical Research Letters |
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2021
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Online Access: | http://livrepository.liverpool.ac.uk/3135725/ https://doi.org/10.1029/2020gl088369 |
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3135725 2023-05-15T18:24:24+02:00 Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean Ratnarajah, Lavenia Blain, Stephane Boyd, Philip W Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro 2021 http://livrepository.liverpool.ac.uk/3135725/ https://doi.org/10.1029/2020gl088369 eng eng American Geophysical Union (AGU) Ratnarajah, Lavenia, Blain, Stephane, Boyd, Philip W, Fourquez, Marion, Obernosterer, Ingrid and Tagliabue, Alessandro orcid:0000-0002-3572-3634 (2021) Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean. GEOPHYSICAL RESEARCH LETTERS, 48 (1). e2020GL088369-. Article NonPeerReviewed 2021 ftunivliverpool https://doi.org/10.1029/2020gl088369 2023-01-20T00:08:47Z 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. Article in Journal/Newspaper Southern Ocean The University of Liverpool Repository Southern Ocean Geophysical Research Letters 48 1 |
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Open Polar |
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The University of Liverpool Repository |
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ftunivliverpool |
language |
English |
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 |
Article in Journal/Newspaper |
author |
Ratnarajah, Lavenia Blain, Stephane Boyd, Philip W Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro |
spellingShingle |
Ratnarajah, Lavenia Blain, Stephane Boyd, Philip W Fourquez, Marion Obernosterer, Ingrid Tagliabue, Alessandro Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean |
author_facet |
Ratnarajah, Lavenia Blain, Stephane 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 |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
http://livrepository.liverpool.ac.uk/3135725/ https://doi.org/10.1029/2020gl088369 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Ratnarajah, Lavenia, Blain, Stephane, Boyd, Philip W, Fourquez, Marion, Obernosterer, Ingrid and Tagliabue, Alessandro orcid:0000-0002-3572-3634 (2021) Resource Colimitation Drives Competition Between Phytoplankton and Bacteria in the Southern Ocean. GEOPHYSICAL RESEARCH LETTERS, 48 (1). e2020GL088369-. |
op_doi |
https://doi.org/10.1029/2020gl088369 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
1 |
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1766204897029521408 |