Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification
The rise in anthropogenic CO 2 and the associated ocean acidification (OA) will change trace metal solubility and speciation, potentially altering Southern Ocean (SO) phytoplankton productivity and species composition. As iron (Fe) sources are important determinants of Fe bioavailability, we assesse...
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ftunivgeneve:oai:unige.ch:unige:95492 2023-05-15T13:37:27+02:00 Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification Trimborn, Scarlett Brenneis, Tina Hoppe, Clara Laglera Baquer, Luis Miguel Norman, Louiza Santos-Echeandia, Juan Völkner, Christian Wolf-Gladrow, Dieter Hassler, Christel 2017 https://archive-ouverte.unige.ch/unige:95492 eng eng info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12250 unige:95492 https://archive-ouverte.unige.ch/unige:95492 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ CC-BY ISSN: 0171-8630 Marine ecology. Progress series, Vol. 578 (2017) pp. 35-50 info:eu-repo/classification/ddc/550 Climate change Ocean acidification Phytoplankton Iron Dust Southern Ocean Community composition Diatoms Phaeocystis Text Article scientifique info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion 2017 ftunivgeneve https://doi.org/10.3354/meps12250 2022-06-19T23:40:38Z The rise in anthropogenic CO 2 and the associated ocean acidification (OA) will change trace metal solubility and speciation, potentially altering Southern Ocean (SO) phytoplankton productivity and species composition. As iron (Fe) sources are important determinants of Fe bioavailability, we assessed the effect of Fe-laden dust versus inorganic Fe (FeCl 3 ) enrichment under ambient and high pCO 2 levels (390 and 900 μatm) in a naturally Fe-limited SO phytoplankton community. Despite similar Fe chemical speciation and net particulate organic carbon (POC) production rates, CO2-dependent species shifts were controlled by Fe sources. Final phytoplankton communities of both control and dust treatments were dominated by the same species, with an OA-dependent shift from the diatom Pseudo nitzschia prolongatoides towards the prymnesiophyte Phaeocystis antarctica. Addition of FeCl 3 resulted in high abundances of Nitzschia lecointei and Chaetoceros neogracilis under ambient and high pCO 2 , respectively. These findings reveal that both the characterization of the phytoplankton community at the species level and the use of natural Fe sources are essential for a realistic projection of the biological carbon pump in the Fe-limited pelagic SO under OA. As dust deposition represents a more realistic scenario for the Fe-limited pelagic SO under OA, unaffected net POC production and dominance of P. antarctica can potentially weaken the export of carbon and silica in the future. Article in Journal/Newspaper Antarc* Antarctica Ocean acidification Southern Ocean Université de Genève: Archive ouverte UNIGE Southern Ocean Marine Ecology Progress Series 578 35 50 |
institution |
Open Polar |
collection |
Université de Genève: Archive ouverte UNIGE |
op_collection_id |
ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Climate change Ocean acidification Phytoplankton Iron Dust Southern Ocean Community composition Diatoms Phaeocystis |
spellingShingle |
info:eu-repo/classification/ddc/550 Climate change Ocean acidification Phytoplankton Iron Dust Southern Ocean Community composition Diatoms Phaeocystis Trimborn, Scarlett Brenneis, Tina Hoppe, Clara Laglera Baquer, Luis Miguel Norman, Louiza Santos-Echeandia, Juan Völkner, Christian Wolf-Gladrow, Dieter Hassler, Christel Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
topic_facet |
info:eu-repo/classification/ddc/550 Climate change Ocean acidification Phytoplankton Iron Dust Southern Ocean Community composition Diatoms Phaeocystis |
description |
The rise in anthropogenic CO 2 and the associated ocean acidification (OA) will change trace metal solubility and speciation, potentially altering Southern Ocean (SO) phytoplankton productivity and species composition. As iron (Fe) sources are important determinants of Fe bioavailability, we assessed the effect of Fe-laden dust versus inorganic Fe (FeCl 3 ) enrichment under ambient and high pCO 2 levels (390 and 900 μatm) in a naturally Fe-limited SO phytoplankton community. Despite similar Fe chemical speciation and net particulate organic carbon (POC) production rates, CO2-dependent species shifts were controlled by Fe sources. Final phytoplankton communities of both control and dust treatments were dominated by the same species, with an OA-dependent shift from the diatom Pseudo nitzschia prolongatoides towards the prymnesiophyte Phaeocystis antarctica. Addition of FeCl 3 resulted in high abundances of Nitzschia lecointei and Chaetoceros neogracilis under ambient and high pCO 2 , respectively. These findings reveal that both the characterization of the phytoplankton community at the species level and the use of natural Fe sources are essential for a realistic projection of the biological carbon pump in the Fe-limited pelagic SO under OA. As dust deposition represents a more realistic scenario for the Fe-limited pelagic SO under OA, unaffected net POC production and dominance of P. antarctica can potentially weaken the export of carbon and silica in the future. |
format |
Article in Journal/Newspaper |
author |
Trimborn, Scarlett Brenneis, Tina Hoppe, Clara Laglera Baquer, Luis Miguel Norman, Louiza Santos-Echeandia, Juan Völkner, Christian Wolf-Gladrow, Dieter Hassler, Christel |
author_facet |
Trimborn, Scarlett Brenneis, Tina Hoppe, Clara Laglera Baquer, Luis Miguel Norman, Louiza Santos-Echeandia, Juan Völkner, Christian Wolf-Gladrow, Dieter Hassler, Christel |
author_sort |
Trimborn, Scarlett |
title |
Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
title_short |
Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
title_full |
Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
title_fullStr |
Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
title_full_unstemmed |
Iron sources alter the response of Southern Ocean phytoplankton to ocean acidification |
title_sort |
iron sources alter the response of southern ocean phytoplankton to ocean acidification |
publishDate |
2017 |
url |
https://archive-ouverte.unige.ch/unige:95492 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctica Ocean acidification Southern Ocean |
op_source |
ISSN: 0171-8630 Marine ecology. Progress series, Vol. 578 (2017) pp. 35-50 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3354/meps12250 unige:95492 https://archive-ouverte.unige.ch/unige:95492 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3354/meps12250 |
container_title |
Marine Ecology Progress Series |
container_volume |
578 |
container_start_page |
35 |
op_container_end_page |
50 |
_version_ |
1766091912398241792 |