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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ftdoajarticles:oai:doaj.org/article:e6e45216d0cb4d6b966c0824b2e84487 2023-05-15T13:40:35+02:00 Iron limitation modulates ocean acidification effects on southern ocean phytoplankton communities. Clara J M Hoppe Christel S Hassler Christopher D Payne Philippe D Tortell Björn Rost Scarlett Trimborn 2013-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0079890 https://doaj.org/article/e6e45216d0cb4d6b966c0824b2e84487 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC3835797?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0079890 https://doaj.org/article/e6e45216d0cb4d6b966c0824b2e84487 PLoS ONE, Vol 8, Iss 11, p e79890 (2013) Medicine R Science Q article 2013 ftdoajarticles https://doi.org/10.1371/journal.pone.0079890 2022-12-31T15:05:31Z 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 Directory of Open Access Journals: DOAJ Articles Southern Ocean Weddell Weddell Sea PLoS ONE 8 11 e79890 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Clara J M Hoppe Christel S Hassler Christopher D Payne Philippe D Tortell Björn Rost Scarlett Trimborn Iron limitation modulates ocean acidification effects on southern ocean phytoplankton communities. |
topic_facet |
Medicine R Science Q |
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 |
Clara J M Hoppe Christel S Hassler Christopher D Payne Philippe D Tortell Björn Rost Scarlett Trimborn |
author_facet |
Clara J M Hoppe Christel S Hassler Christopher D Payne Philippe D Tortell Björn Rost Scarlett Trimborn |
author_sort |
Clara J M Hoppe |
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 (PLoS) |
publishDate |
2013 |
url |
https://doi.org/10.1371/journal.pone.0079890 https://doaj.org/article/e6e45216d0cb4d6b966c0824b2e84487 |
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 |
PLoS ONE, Vol 8, Iss 11, p e79890 (2013) |
op_relation |
http://europepmc.org/articles/PMC3835797?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0079890 https://doaj.org/article/e6e45216d0cb4d6b966c0824b2e84487 |
op_doi |
https://doi.org/10.1371/journal.pone.0079890 |
container_title |
PLoS ONE |
container_volume |
8 |
container_issue |
11 |
container_start_page |
e79890 |
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1766137333103460352 |