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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Online Access: | https://doi.org/10.1029/2020GL088369 http://ecite.utas.edu.au/152042 |
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ftunivtasecite:oai:ecite.utas.edu.au:152042 2023-05-15T18:24:24+02:00 Resource colimitation drives competition between phytoplankton and bacteria in the Southern Ocean Ratnarajah, L Blain, S Boyd, PW Fourquez, M Obernosterer, I Tagliabue, A 2021 application/pdf https://doi.org/10.1029/2020GL088369 http://ecite.utas.edu.au/152042 en eng Amer Geophysical Union http://ecite.utas.edu.au/152042/1/152042 - Resource colimitation drives competition between phytoplankton.pdf http://dx.doi.org/10.1029/2020GL088369 Ratnarajah, L and Blain, S and Boyd, PW and Fourquez, M and Obernosterer, I and Tagliabue, A, Resource colimitation drives competition between phytoplankton and bacteria in the Southern Ocean, Geophysical Research Letters, 48, (1) pp. 1-11. ISSN 0094-8276 (2021) [Refereed Article] http://ecite.utas.edu.au/152042 Earth Sciences Oceanography Biological oceanography Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1029/2020GL088369 2022-10-31T23:17:14Z 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 eCite UTAS (University of Tasmania) Southern Ocean Geophysical Research Letters 48 1 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological oceanography |
spellingShingle |
Earth Sciences Oceanography Biological oceanography Ratnarajah, L Blain, S Boyd, PW Fourquez, M Obernosterer, I Tagliabue, A Resource colimitation drives competition between phytoplankton and bacteria in the Southern Ocean |
topic_facet |
Earth Sciences Oceanography Biological oceanography |
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, L Blain, S Boyd, PW Fourquez, M Obernosterer, I Tagliabue, A |
author_facet |
Ratnarajah, L Blain, S Boyd, PW Fourquez, M Obernosterer, I Tagliabue, A |
author_sort |
Ratnarajah, L |
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 |
Amer Geophysical Union |
publishDate |
2021 |
url |
https://doi.org/10.1029/2020GL088369 http://ecite.utas.edu.au/152042 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://ecite.utas.edu.au/152042/1/152042 - Resource colimitation drives competition between phytoplankton.pdf http://dx.doi.org/10.1029/2020GL088369 Ratnarajah, L and Blain, S and Boyd, PW and Fourquez, M and Obernosterer, I and Tagliabue, A, Resource colimitation drives competition between phytoplankton and bacteria in the Southern Ocean, Geophysical Research Letters, 48, (1) pp. 1-11. ISSN 0094-8276 (2021) [Refereed Article] http://ecite.utas.edu.au/152042 |
op_doi |
https://doi.org/10.1029/2020GL088369 |
container_title |
Geophysical Research Letters |
container_volume |
48 |
container_issue |
1 |
_version_ |
1766204894734188544 |