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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Published in:PLOS ONE
Main Authors: Pagnone, Anna, Koch, Florian, Pausch, Franziska, Trimborn, Scarlett
Format: Article in Journal/Newspaper
Language:unknown
Published: PUBLIC LIBRARY SCIENCE 2021
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Online Access:https://epic.awi.de/id/eprint/55252/
https://hdl.handle.net/10013/epic.149f9b3e-9689-4f11-adb1-81e3d9e05b4c
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spelling 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
institution Open Polar
collection Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
op_collection_id ftawi
language unknown
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
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