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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Online Access: | https://doi.org/10.4319/lo.2012.57.4.1182 http://ecite.utas.edu.au/95568 |
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ftunivtasecite:oai:ecite.utas.edu.au:95568 2023-05-15T13:59:46+02:00 Iron-light interactions differ in Southern Ocean phytoplankton Strzepek, RF Hunter, KA Frew, RD Harrison, PJ Boyd, PW 2012 application/pdf https://doi.org/10.4319/lo.2012.57.4.1182 http://ecite.utas.edu.au/95568 en eng Amer Soc Limnology Oceanography http://ecite.utas.edu.au/95568/1/1182.pdf http://dx.doi.org/10.4319/lo.2012.57.4.1182 Strzepek, RF and Hunter, KA and Frew, RD and Harrison, PJ and Boyd, PW, Iron-light interactions differ in Southern Ocean phytoplankton, Limnology and Oceanography, 57, (4) pp. 1182-1200. ISSN 0024-3590 (2012) [Refereed Article] http://ecite.utas.edu.au/95568 Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Refereed Article PeerReviewed 2012 ftunivtasecite https://doi.org/10.4319/lo.2012.57.4.1182 2021-11-22T23:17:57Z 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 eCite UTAS (University of Tasmania) Southern Ocean Limnology and Oceanography 57 4 1182 1200 |
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eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) Strzepek, RF Hunter, KA Frew, RD Harrison, PJ Boyd, PW Iron-light interactions differ in Southern Ocean phytoplankton |
topic_facet |
Biological Sciences Ecology Marine and estuarine ecology (incl. marine ichthyology) |
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, RF Hunter, KA Frew, RD Harrison, PJ Boyd, PW |
author_facet |
Strzepek, RF Hunter, KA Frew, RD Harrison, PJ Boyd, PW |
author_sort |
Strzepek, RF |
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 |
Amer Soc Limnology Oceanography |
publishDate |
2012 |
url |
https://doi.org/10.4319/lo.2012.57.4.1182 http://ecite.utas.edu.au/95568 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
http://ecite.utas.edu.au/95568/1/1182.pdf http://dx.doi.org/10.4319/lo.2012.57.4.1182 Strzepek, RF and Hunter, KA and Frew, RD and Harrison, PJ and Boyd, PW, Iron-light interactions differ in Southern Ocean phytoplankton, Limnology and Oceanography, 57, (4) pp. 1182-1200. ISSN 0024-3590 (2012) [Refereed Article] http://ecite.utas.edu.au/95568 |
op_doi |
https://doi.org/10.4319/lo.2012.57.4.1182 |
container_title |
Limnology and Oceanography |
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57 |
container_issue |
4 |
container_start_page |
1182 |
op_container_end_page |
1200 |
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1766268575704678400 |