Iron‐light interactions differ in Southern Ocean phytoplankton
In laboratory experiments we examined the interplay of light and iron availability on the intracellular iron concentrations, specific growth rates, and photosynthetic physiology of Southern (S.) Ocean diatoms ( Eucampia antarctica and Proboscia inermis ) and the haptophyte Phaeocystis antarctica . I...
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crwiley:10.4319/lo.2012.57.4.1182 2024-09-15T17:48:49+00:00 Iron‐light interactions differ in Southern Ocean phytoplankton Strzepek, Robert F. Hunter, Keith A. Frew, Russell D. Harrison, Paul J. Boyd, Philip W. 2012 http://dx.doi.org/10.4319/lo.2012.57.4.1182 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.4.1182 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.4.1182 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 57, issue 4, page 1182-1200 ISSN 0024-3590 1939-5590 journal-article 2012 crwiley https://doi.org/10.4319/lo.2012.57.4.1182 2024-09-05T05:08:18Z In laboratory experiments we examined the interplay of light and iron availability on the intracellular iron concentrations, specific growth rates, and photosynthetic physiology of Southern (S.) Ocean diatoms ( Eucampia antarctica and Proboscia inermis ) and the haptophyte Phaeocystis antarctica . Intracellular iron concentrations and iron : carbon (Fe : C) molar ratios increased with decreasing irradiance in temperate coastal ( Thalassiosira weissflogii ) and oceanic ( Thalassiosira oceanica ) diatoms, in support of the well‐established antagonistic iron‐light relationship. In contrast, S. Ocean species required lower cellular iron concentrations and Fe : C ratios than temperate diatoms to grow at comparable rates, and their iron requirements decreased or remained relatively constant with decreasing light. These results suggest that the current paradigm that low light increases algal cellular iron requirements (supplied through “biodilution”) is not applicable to S. Ocean phytoplankton. Although iron use efficiencies decreased at sub‐saturating light in all species, these reductions were due primarily to lower growth rates, but not higher intracellular Fe : C ratios, in S. Ocean species. We propose that S. Ocean species have overcome the antagonistic iron‐light relationship by increasing the size, rather than the number, of photosynthetic units under low irradiances, resulting in an acclimation strategy that does not increase their cellular iron requirements. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Wiley Online Library Limnology and Oceanography 57 4 1182 1200 |
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English |
description |
In laboratory experiments we examined the interplay of light and iron availability on the intracellular iron concentrations, specific growth rates, and photosynthetic physiology of Southern (S.) Ocean diatoms ( Eucampia antarctica and Proboscia inermis ) and the haptophyte Phaeocystis antarctica . Intracellular iron concentrations and iron : carbon (Fe : C) molar ratios increased with decreasing irradiance in temperate coastal ( Thalassiosira weissflogii ) and oceanic ( Thalassiosira oceanica ) diatoms, in support of the well‐established antagonistic iron‐light relationship. In contrast, S. Ocean species required lower cellular iron concentrations and Fe : C ratios than temperate diatoms to grow at comparable rates, and their iron requirements decreased or remained relatively constant with decreasing light. These results suggest that the current paradigm that low light increases algal cellular iron requirements (supplied through “biodilution”) is not applicable to S. Ocean phytoplankton. Although iron use efficiencies decreased at sub‐saturating light in all species, these reductions were due primarily to lower growth rates, but not higher intracellular Fe : C ratios, in S. Ocean species. We propose that S. Ocean species have overcome the antagonistic iron‐light relationship by increasing the size, rather than the number, of photosynthetic units under low irradiances, resulting in an acclimation strategy that does not increase their cellular iron requirements. |
format |
Article in Journal/Newspaper |
author |
Strzepek, Robert F. Hunter, Keith A. Frew, Russell D. Harrison, Paul J. Boyd, Philip W. |
spellingShingle |
Strzepek, Robert F. Hunter, Keith A. Frew, Russell D. Harrison, Paul J. Boyd, Philip W. Iron‐light interactions differ in Southern Ocean phytoplankton |
author_facet |
Strzepek, Robert F. Hunter, Keith A. Frew, Russell D. Harrison, Paul J. Boyd, Philip W. |
author_sort |
Strzepek, Robert F. |
title |
Iron‐light interactions differ in Southern Ocean phytoplankton |
title_short |
Iron‐light interactions differ in Southern Ocean phytoplankton |
title_full |
Iron‐light interactions differ in Southern Ocean phytoplankton |
title_fullStr |
Iron‐light interactions differ in Southern Ocean phytoplankton |
title_full_unstemmed |
Iron‐light interactions differ in Southern Ocean phytoplankton |
title_sort |
iron‐light interactions differ in southern ocean phytoplankton |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.4319/lo.2012.57.4.1182 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2012.57.4.1182 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2012.57.4.1182 |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
Limnology and Oceanography volume 57, issue 4, page 1182-1200 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2012.57.4.1182 |
container_title |
Limnology and Oceanography |
container_volume |
57 |
container_issue |
4 |
container_start_page |
1182 |
op_container_end_page |
1200 |
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1810290348163858432 |