The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron
The ‘Iron Hypothesis’ suggests a fertilization of the Southern Ocean by increased dust deposition in glacial times. This promoted high primary productivity and contributed to lower atmospheric pCO2. In this study, the diatom Pseudo-nitzschia subcurvata, known to form prominent blooms in the Southern...
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PUBLIC LIBRARY SCIENCE
2021
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ftawi:oai:epic.awi.de:55252 2024-09-15T18:37:02+00:00 The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron Pagnone, Anna Koch, Florian Pausch, Franziska Trimborn, Scarlett 2021-12-10 https://epic.awi.de/id/eprint/55252/ https://hdl.handle.net/10013/epic.149f9b3e-9689-4f11-adb1-81e3d9e05b4c unknown PUBLIC LIBRARY SCIENCE Pagnone, A. , Koch, F. orcid:0000-0001-7107-4160 , Pausch, F. orcid:0000-0002-4207-1304 and Trimborn, S. orcid:0000-0003-1434-9927 (2021) The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron , PLoS ONE, 16(12) . doi:10.1371/journal.pone.0260649 <https://doi.org/10.1371/journal.pone.0260649> , hdl:10013/epic.149f9b3e-9689-4f11-adb1-81e3d9e05b4c EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 16(12), ISSN: 1932-6203 Article isiRev 2021 ftawi https://doi.org/10.1371/journal.pone.0260649 2024-06-24T04:27:29Z The ‘Iron Hypothesis’ suggests a fertilization of the Southern Ocean by increased dust deposition in glacial times. This promoted high primary productivity and contributed to lower atmospheric pCO2. In this study, the diatom Pseudo-nitzschia subcurvata, known to form prominent blooms in the Southern Ocean, was grown under simulated glacial and interglacial climatic conditions to understand how iron (Fe) availability (no Fe or Fe addition) in conjunction with different pCO2 levels (190 and 290 μatm) influences growth, particulate organic carbon (POC) production and photophysiology. Under both glacial and interglacial conditions, the diatom grew with similar rates. In comparison, glacial conditions (190 μatm pCO2 and Fe input) favored POC production by P. subcurvata while under interglacial conditions (290 μatm pCO2 and Fe deficiency) POC production was reduced, indicating a negative effect caused by higher pCO2 and low Fe availability. Under interglacial conditions, the diatom had, however, thicker silica shells. Overall, our results show that the combination of higher Fe availability with low pCO2, present during the glacial ocean, was beneficial for the diatom P. subcurvata, thus contributing more to primary production during glacial compared to interglacial times. Under the interglacial ocean conditions, on the other hand, the diatom could have contributed to higher carbon export due to its higher degree of silicification. Article in Journal/Newspaper Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) PLOS ONE 16 12 e0260649 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
The ‘Iron Hypothesis’ suggests a fertilization of the Southern Ocean by increased dust deposition in glacial times. This promoted high primary productivity and contributed to lower atmospheric pCO2. In this study, the diatom Pseudo-nitzschia subcurvata, known to form prominent blooms in the Southern Ocean, was grown under simulated glacial and interglacial climatic conditions to understand how iron (Fe) availability (no Fe or Fe addition) in conjunction with different pCO2 levels (190 and 290 μatm) influences growth, particulate organic carbon (POC) production and photophysiology. Under both glacial and interglacial conditions, the diatom grew with similar rates. In comparison, glacial conditions (190 μatm pCO2 and Fe input) favored POC production by P. subcurvata while under interglacial conditions (290 μatm pCO2 and Fe deficiency) POC production was reduced, indicating a negative effect caused by higher pCO2 and low Fe availability. Under interglacial conditions, the diatom had, however, thicker silica shells. Overall, our results show that the combination of higher Fe availability with low pCO2, present during the glacial ocean, was beneficial for the diatom P. subcurvata, thus contributing more to primary production during glacial compared to interglacial times. Under the interglacial ocean conditions, on the other hand, the diatom could have contributed to higher carbon export due to its higher degree of silicification. |
format |
Article in Journal/Newspaper |
author |
Pagnone, Anna Koch, Florian Pausch, Franziska Trimborn, Scarlett |
spellingShingle |
Pagnone, Anna Koch, Florian Pausch, Franziska Trimborn, Scarlett The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
author_facet |
Pagnone, Anna Koch, Florian Pausch, Franziska Trimborn, Scarlett |
author_sort |
Pagnone, Anna |
title |
The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
title_short |
The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
title_full |
The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
title_fullStr |
The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
title_full_unstemmed |
The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron |
title_sort |
southern ocean diatom pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: combined effects of co2 and iron |
publisher |
PUBLIC LIBRARY SCIENCE |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/55252/ https://hdl.handle.net/10013/epic.149f9b3e-9689-4f11-adb1-81e3d9e05b4c |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3PLoS ONE, PUBLIC LIBRARY SCIENCE, 16(12), ISSN: 1932-6203 |
op_relation |
Pagnone, A. , Koch, F. orcid:0000-0001-7107-4160 , Pausch, F. orcid:0000-0002-4207-1304 and Trimborn, S. orcid:0000-0003-1434-9927 (2021) The Southern Ocean diatom Pseudo-nitzschia subcurvata flourished better under simulated glacial than interglacial ocean conditions: Combined effects of CO2 and iron , PLoS ONE, 16(12) . doi:10.1371/journal.pone.0260649 <https://doi.org/10.1371/journal.pone.0260649> , hdl:10013/epic.149f9b3e-9689-4f11-adb1-81e3d9e05b4c |
op_doi |
https://doi.org/10.1371/journal.pone.0260649 |
container_title |
PLOS ONE |
container_volume |
16 |
container_issue |
12 |
container_start_page |
e0260649 |
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1810481215395856384 |