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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ftpubmed:oai:pubmedcentral.nih.gov:3835797 2023-05-15T14:02:38+02:00 Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities Hoppe, Clara J. M. Hassler, Christel S. Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett 2013-11-20 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3835797 http://www.ncbi.nlm.nih.gov/pubmed/24278207 https://doi.org/10.1371/journal.pone.0079890 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3835797 http://www.ncbi.nlm.nih.gov/pubmed/24278207 http://dx.doi.org/10.1371/journal.pone.0079890 http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2013 ftpubmed https://doi.org/10.1371/journal.pone.0079890 2013-12-01T01:32:36Z 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. Text Antarc* Antarctica Ocean acidification Southern Ocean Weddell Sea PubMed Central (PMC) Southern Ocean Weddell Weddell Sea PLoS ONE 8 11 e79890 |
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Research Article |
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Research Article Hoppe, Clara J. M. Hassler, Christel S. Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett Iron Limitation Modulates Ocean Acidification Effects on Southern Ocean Phytoplankton Communities |
topic_facet |
Research Article |
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 |
Text |
author |
Hoppe, Clara J. M. Hassler, Christel S. Payne, Christopher D. Tortell, Philippe D. Rost, Björn Trimborn, Scarlett |
author_facet |
Hoppe, Clara J. M. Hassler, Christel S. 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 |
publisher |
Public Library of Science |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3835797 http://www.ncbi.nlm.nih.gov/pubmed/24278207 https://doi.org/10.1371/journal.pone.0079890 |
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_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3835797 http://www.ncbi.nlm.nih.gov/pubmed/24278207 http://dx.doi.org/10.1371/journal.pone.0079890 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0079890 |
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PLoS ONE |
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8 |
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11 |
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e79890 |
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