Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities
The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a long-term incubation experiment investigating the combined effects of CO2 and Fe availability on natural phytoplankton assemblages from the W...
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ftunivgeneve:oai:unige.ch:aou:unige:34316 2023-10-01T03:52:10+02:00 Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities Hoppe, Clara J. M. Hassler, Christel Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett 2013 https://archive-ouverte.unige.ch/unige:34316 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0079890 https://archive-ouverte.unige.ch/unige:34316 unige:34316 info:eu-repo/semantics/openAccess ISSN: 1932-6203 PloS one, vol. 8, no. 11 (2013) e79890 info:eu-repo/classification/ddc/550 info:eu-repo/semantics/article Text Article scientifique info:eu-repo/semantics/publishedVersion 2013 ftunivgeneve https://doi.org/10.1371/journal.pone.0079890 2023-09-07T07:12:40Z The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a long-term incubation experiment investigating the combined effects of CO2 and Fe availability on natural phytoplankton assemblages from the Weddell Sea, Antarctica. Active Chl a fluorescence measurements revealed that we successfully cultured phytoplankton under both Fe-depleted and Fe-enriched conditions. Fe treatments had significant effects on photosynthetic efficiency (Fv/Fm; 0.3 for Fe-depleted and 0.5 for Fe-enriched conditions), non-photochemical quenching (NPQ), and relative electron transport rates (rETR). pCO2 treatments significantly affected NPQ and rETR, but had no effect on Fv/Fm. Under Fe limitation, increased pCO2 had no influence on C fixation whereas under Fe enrichment, primary production increased with increasing pCO2 levels. These CO2-dependent changes in productivity under Fe-enriched conditions were accompanied by a pronounced taxonomic shift from weakly to heavily silicified diatoms (i.e. from Pseudo-nitzschia sp. to Fragilariopsis sp.). Under Fe-depleted conditions, this functional shift was absent and thinly silicified species dominated all pCO2 treatments (Pseudo-nitzschia sp. and Synedropsis sp. for low and high pCO2, respectively). Our results suggest that Ocean Acidification could increase primary productivity and the abundance of heavily silicified, fast sinking diatoms in Fe-enriched areas, both potentially leading to a stimulation of the biological pump. Over much of the SO, however, Fe limitation could restrict this possible CO2 fertilization effect. Article in Journal/Newspaper Antarc* Antarctica Ocean acidification Southern Ocean Weddell Sea Université de Genève: Archive ouverte UNIGE Southern Ocean Weddell Weddell Sea PLoS ONE 8 11 e79890 |
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Université de Genève: Archive ouverte UNIGE |
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English |
topic |
info:eu-repo/classification/ddc/550 |
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info:eu-repo/classification/ddc/550 Hoppe, Clara J. M. Hassler, Christel Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a long-term incubation experiment investigating the combined effects of CO2 and Fe availability on natural phytoplankton assemblages from the Weddell Sea, Antarctica. Active Chl a fluorescence measurements revealed that we successfully cultured phytoplankton under both Fe-depleted and Fe-enriched conditions. Fe treatments had significant effects on photosynthetic efficiency (Fv/Fm; 0.3 for Fe-depleted and 0.5 for Fe-enriched conditions), non-photochemical quenching (NPQ), and relative electron transport rates (rETR). pCO2 treatments significantly affected NPQ and rETR, but had no effect on Fv/Fm. Under Fe limitation, increased pCO2 had no influence on C fixation whereas under Fe enrichment, primary production increased with increasing pCO2 levels. These CO2-dependent changes in productivity under Fe-enriched conditions were accompanied by a pronounced taxonomic shift from weakly to heavily silicified diatoms (i.e. from Pseudo-nitzschia sp. to Fragilariopsis sp.). Under Fe-depleted conditions, this functional shift was absent and thinly silicified species dominated all pCO2 treatments (Pseudo-nitzschia sp. and Synedropsis sp. for low and high pCO2, respectively). Our results suggest that Ocean Acidification could increase primary productivity and the abundance of heavily silicified, fast sinking diatoms in Fe-enriched areas, both potentially leading to a stimulation of the biological pump. Over much of the SO, however, Fe limitation could restrict this possible CO2 fertilization effect. |
format |
Article in Journal/Newspaper |
author |
Hoppe, Clara J. M. Hassler, Christel Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett |
author_facet |
Hoppe, Clara J. M. Hassler, Christel Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett |
author_sort |
Hoppe, Clara J. M. |
title |
Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
title_short |
Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
title_full |
Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
title_fullStr |
Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
title_full_unstemmed |
Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
title_sort |
iron limitation modulates ocean acidification effects on southern ocean phytoplankton communities |
publishDate |
2013 |
url |
https://archive-ouverte.unige.ch/unige:34316 |
geographic |
Southern Ocean Weddell Weddell Sea |
geographic_facet |
Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctica Ocean acidification Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctica Ocean acidification Southern Ocean Weddell Sea |
op_source |
ISSN: 1932-6203 PloS one, vol. 8, no. 11 (2013) e79890 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1371/journal.pone.0079890 https://archive-ouverte.unige.ch/unige:34316 unige:34316 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1371/journal.pone.0079890 |
container_title |
PLoS ONE |
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8 |
container_issue |
11 |
container_start_page |
e79890 |
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1778517903416492032 |