Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress
Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compa...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/218147 2024-01-14T10:00:06+01:00 Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress Luxem, Katjia Ellwood, Michael Strzepek, Robert application/pdf http://hdl.handle.net/1885/218147 https://doi.org/10.1371/journal.pone.0179751 https://openresearch-repository.anu.edu.au/bitstream/1885/218147/3/intraspecific%20variability.pdf.jpg en_AU eng Public Library of Science http://purl.org/au-research/grants/arc/DP130100679 1932-6203 http://hdl.handle.net/1885/218147 doi:10.1371/journal.pone.0179751 https://openresearch-repository.anu.edu.au/bitstream/1885/218147/3/intraspecific%20variability.pdf.jpg © 2017 Luxem et al. https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution License PLOS ONE (Public Library of Science) Journal article ftanucanberra https://doi.org/10.1371/journal.pone.0179751 2023-12-15T09:37:39Z Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compare the growth, cell size and chlorophyll a concentrations of four P. antarctica clones cultured under different iron and light conditions. Iron was provided either as unchelated iron (Fe′) or bound to the bacterial siderophore desferrioxamine B, representing, respectively, the most and least bioavailable forms of iron which phytoplankton encounter in the marine environment. The growth rate data demonstrate that the clones vary in their ability to grow using organically bound iron, and that this ability is not related to their ability to grow at low inorganic iron concentrations. These results are consistent at low and high light. Physiologically, only three of the four clones shrink or decrease the concentration of chlorophyll a in response to iron limitation, and only one clone decreases colony formation. Together, our data show that P. antarctica clones 1) respond to the same degree of iron limitation using different acclimation strategies, and 2) vary in their ability to grow under the same external iron and light conditions. This physiological diversity is surprisingly large for isolates of a single phytoplankton species. KEL was supported by the Robert and Delpha Noland Summer Internship, which funded her travel to and accommodation in Australia. The Australian Research Council (DP130100679 to MJE) is acknowledged for funds to support this study. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Australian National University: ANU Digital Collections Southern Ocean PLOS ONE 12 7 e0179751 |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
English |
description |
Phaeocystis antarctica is an abundant phytoplankton species in the Southern Ocean, where growth is frequently limited by iron and light. Being able to grow under low iron conditions is essential to the species’ success, but there have been hints that this ability differs among clones. Here, we compare the growth, cell size and chlorophyll a concentrations of four P. antarctica clones cultured under different iron and light conditions. Iron was provided either as unchelated iron (Fe′) or bound to the bacterial siderophore desferrioxamine B, representing, respectively, the most and least bioavailable forms of iron which phytoplankton encounter in the marine environment. The growth rate data demonstrate that the clones vary in their ability to grow using organically bound iron, and that this ability is not related to their ability to grow at low inorganic iron concentrations. These results are consistent at low and high light. Physiologically, only three of the four clones shrink or decrease the concentration of chlorophyll a in response to iron limitation, and only one clone decreases colony formation. Together, our data show that P. antarctica clones 1) respond to the same degree of iron limitation using different acclimation strategies, and 2) vary in their ability to grow under the same external iron and light conditions. This physiological diversity is surprisingly large for isolates of a single phytoplankton species. KEL was supported by the Robert and Delpha Noland Summer Internship, which funded her travel to and accommodation in Australia. The Australian Research Council (DP130100679 to MJE) is acknowledged for funds to support this study. |
format |
Article in Journal/Newspaper |
author |
Luxem, Katjia Ellwood, Michael Strzepek, Robert |
spellingShingle |
Luxem, Katjia Ellwood, Michael Strzepek, Robert Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
author_facet |
Luxem, Katjia Ellwood, Michael Strzepek, Robert |
author_sort |
Luxem, Katjia |
title |
Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
title_short |
Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
title_full |
Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
title_fullStr |
Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
title_full_unstemmed |
Intraspecific variability in Phaeocystis antarctica?s response to iron and light stress |
title_sort |
intraspecific variability in phaeocystis antarctica?s response to iron and light stress |
publisher |
Public Library of Science |
url |
http://hdl.handle.net/1885/218147 https://doi.org/10.1371/journal.pone.0179751 https://openresearch-repository.anu.edu.au/bitstream/1885/218147/3/intraspecific%20variability.pdf.jpg |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
PLOS ONE (Public Library of Science) |
op_relation |
http://purl.org/au-research/grants/arc/DP130100679 1932-6203 http://hdl.handle.net/1885/218147 doi:10.1371/journal.pone.0179751 https://openresearch-repository.anu.edu.au/bitstream/1885/218147/3/intraspecific%20variability.pdf.jpg |
op_rights |
© 2017 Luxem et al. https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution License |
op_doi |
https://doi.org/10.1371/journal.pone.0179751 |
container_title |
PLOS ONE |
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12 |
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7 |
container_start_page |
e0179751 |
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1788063492076470272 |