Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements
We report results of laboratory studies examining the effect of low levels of iron (Fe) availability on the intracellular Fe concentrations and specific growth rates in Southern Ocean diatoms ( Fragilariopsis kerguelensis , Eucampia antarctica , Proboscia inermis , and Thalassiosira antarctica ) and...
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Online Access: | http://dx.doi.org/10.4319/lo.2011.56.6.1983 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2011.56.6.1983 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2011.56.6.1983 |
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crwiley:10.4319/lo.2011.56.6.1983 2024-09-30T14:25:57+00:00 Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements Strzepek, Robert F. Maldonado, Maria T. Hunter, Keith A. Frew, Russell D. Boyd, Philip W. 2011 http://dx.doi.org/10.4319/lo.2011.56.6.1983 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2011.56.6.1983 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2011.56.6.1983 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 56, issue 6, page 1983-2002 ISSN 0024-3590 1939-5590 journal-article 2011 crwiley https://doi.org/10.4319/lo.2011.56.6.1983 2024-09-11T04:16:53Z We report results of laboratory studies examining the effect of low levels of iron (Fe) availability on the intracellular Fe concentrations and specific growth rates in Southern Ocean diatoms ( Fragilariopsis kerguelensis , Eucampia antarctica , Proboscia inermis , and Thalassiosira antarctica ) and Phaeocystis antarctica . All species grew on Fe complexed to the siderophore desferrioxamine B (DFB). Concentrations of DFB up to 100‐fold in excess of Fe were required to limit growth rates by ≥ 50%. Southern Ocean phytoplankton also grew on Fe complexed by ≥ 10‐fold excess concentrations of the siderophores ferrichrome, enterobactin, or aerobactin, whereas the temperate coastal diatoms Thalassiosira weissflogii and Thalassiosira pseudonana did not. Intracellular Fe concentrations and Fe : C ratios of all Southern Ocean species were exceptionally low and decreased with decreasing Fe availability. However, large diatoms had significantly lower cell‐volume‐normalized Fe content and Fe : C ratios than Phaeocystis . Short‐term Fe uptake and extracellular Fe(II) production measurements provided evidence that Phaeocystis possesses a reductive Fe transport pathway. Our findings demonstrate that the large‐diatom Fe requirements are at least 2‐fold lower than currently reported for oceanic algal species and suggest that bioreduction may enable resident phytoplankton to directly use Fe bound to strong organic ligands. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean Wiley Online Library Southern Ocean Limnology and Oceanography 56 6 1983 2002 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
We report results of laboratory studies examining the effect of low levels of iron (Fe) availability on the intracellular Fe concentrations and specific growth rates in Southern Ocean diatoms ( Fragilariopsis kerguelensis , Eucampia antarctica , Proboscia inermis , and Thalassiosira antarctica ) and Phaeocystis antarctica . All species grew on Fe complexed to the siderophore desferrioxamine B (DFB). Concentrations of DFB up to 100‐fold in excess of Fe were required to limit growth rates by ≥ 50%. Southern Ocean phytoplankton also grew on Fe complexed by ≥ 10‐fold excess concentrations of the siderophores ferrichrome, enterobactin, or aerobactin, whereas the temperate coastal diatoms Thalassiosira weissflogii and Thalassiosira pseudonana did not. Intracellular Fe concentrations and Fe : C ratios of all Southern Ocean species were exceptionally low and decreased with decreasing Fe availability. However, large diatoms had significantly lower cell‐volume‐normalized Fe content and Fe : C ratios than Phaeocystis . Short‐term Fe uptake and extracellular Fe(II) production measurements provided evidence that Phaeocystis possesses a reductive Fe transport pathway. Our findings demonstrate that the large‐diatom Fe requirements are at least 2‐fold lower than currently reported for oceanic algal species and suggest that bioreduction may enable resident phytoplankton to directly use Fe bound to strong organic ligands. |
format |
Article in Journal/Newspaper |
author |
Strzepek, Robert F. Maldonado, Maria T. Hunter, Keith A. Frew, Russell D. Boyd, Philip W. |
spellingShingle |
Strzepek, Robert F. Maldonado, Maria T. Hunter, Keith A. Frew, Russell D. Boyd, Philip W. Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
author_facet |
Strzepek, Robert F. Maldonado, Maria T. Hunter, Keith A. Frew, Russell D. Boyd, Philip W. |
author_sort |
Strzepek, Robert F. |
title |
Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
title_short |
Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
title_full |
Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
title_fullStr |
Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
title_full_unstemmed |
Adaptive strategies by Southern Ocean phytoplankton to lessen iron limitation: Uptake of organically complexed iron and reduced cellular iron requirements |
title_sort |
adaptive strategies by southern ocean phytoplankton to lessen iron limitation: uptake of organically complexed iron and reduced cellular iron requirements |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.4319/lo.2011.56.6.1983 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2011.56.6.1983 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2011.56.6.1983 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
Limnology and Oceanography volume 56, issue 6, page 1983-2002 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.4319/lo.2011.56.6.1983 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
6 |
container_start_page |
1983 |
op_container_end_page |
2002 |
_version_ |
1811646518158950400 |