Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current
Ocean iron fertilization experiments enable the quantitative study of processes shaping the structure and functioning of pelagic ecosystems following perturbation under in situ conditions. EIFEX was conducted within a stationary eddy adjacent to the Antarctic Polar Front over 38 days in February/Mar...
Published in: | Journal of Plankton Research |
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Oxford Univ Press
2014
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Online Access: | https://archimer.ifremer.fr/doc/00290/40091/39174.pdf https://archimer.ifremer.fr/doc/00290/40091/39177.pdf https://archimer.ifremer.fr/doc/00290/40091/39178.docx https://doi.org/10.1093/plankt/fbu068 https://archimer.ifremer.fr/doc/00290/40091/ |
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ftarchimer:oai:archimer.ifremer.fr:40091 2023-05-15T13:50:50+02:00 Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current Assmy, Philipp Cisewski, Boris Henjes, Joachim Klaas, Christine Montresor, Marina Smetacek, Victor 2014-09 application/pdf https://archimer.ifremer.fr/doc/00290/40091/39174.pdf https://archimer.ifremer.fr/doc/00290/40091/39177.pdf https://archimer.ifremer.fr/doc/00290/40091/39178.docx https://doi.org/10.1093/plankt/fbu068 https://archimer.ifremer.fr/doc/00290/40091/ eng eng Oxford Univ Press https://archimer.ifremer.fr/doc/00290/40091/39174.pdf https://archimer.ifremer.fr/doc/00290/40091/39177.pdf https://archimer.ifremer.fr/doc/00290/40091/39178.docx doi:10.1093/plankt/fbu068 https://archimer.ifremer.fr/doc/00290/40091/ The Author 2014. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oup.com info:eu-repo/semantics/openAccess restricted use Journal Of Plankton Research (0142-7873) (Oxford Univ Press), 2014-09 , Vol. 36 , N. 5 , P. 1175-1189 protozoa rhizaria sarcodines Southern Ocean top-down control text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1093/plankt/fbu068 2021-09-23T20:26:50Z Ocean iron fertilization experiments enable the quantitative study of processes shaping the structure and functioning of pelagic ecosystems following perturbation under in situ conditions. EIFEX was conducted within a stationary eddy adjacent to the Antarctic Polar Front over 38 days in February/March 2004 and induced a massive diatom bloom. Here, we present the responses in abundance and biomass of all identifiable protozooplankton taxa (heterotrophic protists ranging from 2 to 500 mm) during the bloom. Acantharia, dinoflagellates and ciliates together contributed >90% of protozooplankton biomass in the upper 100 m throughout the experiment with heterotrophic nanoflagellates, nassellaria, spumellaria, phaeodaria, foraminifera and the taxopodidean Sticholonche zanclea providing the remainder. Total protozooplankton biomass increased slightly from 1.0 to 1.3 g C m(-2) within the fertilized patch and remained at 0.7+0.04 g C m(-2) outside it. However, distinct trends in population build-up or decline were observed within the dominant taxa in each group. In general, smaller less-defended groups such as aloricate ciliates and athecate dinoflagellates declined, whereas the biomass of large, spiny and armoured groups, in particular acantharia, large tintinnids and thecate dinoflagellates increased inside the patch. We attribute the higher accumulation rates of defended taxa to selective, heavy grazing pressure by the large stocks of copepods. Of the defended taxa, acantharia had the lowest mortality rates and the highest biomass. Large stocks of tintinnid loricae in the deep water column identify this group as a relevant contributor to deep organic carbon export. Highest accumulation rates (0.11 day(-1)) were recorded in S. zanclea. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Copepods Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Southern Ocean The Antarctic Journal of Plankton Research 36 5 1175 1189 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
protozoa rhizaria sarcodines Southern Ocean top-down control |
spellingShingle |
protozoa rhizaria sarcodines Southern Ocean top-down control Assmy, Philipp Cisewski, Boris Henjes, Joachim Klaas, Christine Montresor, Marina Smetacek, Victor Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
topic_facet |
protozoa rhizaria sarcodines Southern Ocean top-down control |
description |
Ocean iron fertilization experiments enable the quantitative study of processes shaping the structure and functioning of pelagic ecosystems following perturbation under in situ conditions. EIFEX was conducted within a stationary eddy adjacent to the Antarctic Polar Front over 38 days in February/March 2004 and induced a massive diatom bloom. Here, we present the responses in abundance and biomass of all identifiable protozooplankton taxa (heterotrophic protists ranging from 2 to 500 mm) during the bloom. Acantharia, dinoflagellates and ciliates together contributed >90% of protozooplankton biomass in the upper 100 m throughout the experiment with heterotrophic nanoflagellates, nassellaria, spumellaria, phaeodaria, foraminifera and the taxopodidean Sticholonche zanclea providing the remainder. Total protozooplankton biomass increased slightly from 1.0 to 1.3 g C m(-2) within the fertilized patch and remained at 0.7+0.04 g C m(-2) outside it. However, distinct trends in population build-up or decline were observed within the dominant taxa in each group. In general, smaller less-defended groups such as aloricate ciliates and athecate dinoflagellates declined, whereas the biomass of large, spiny and armoured groups, in particular acantharia, large tintinnids and thecate dinoflagellates increased inside the patch. We attribute the higher accumulation rates of defended taxa to selective, heavy grazing pressure by the large stocks of copepods. Of the defended taxa, acantharia had the lowest mortality rates and the highest biomass. Large stocks of tintinnid loricae in the deep water column identify this group as a relevant contributor to deep organic carbon export. Highest accumulation rates (0.11 day(-1)) were recorded in S. zanclea. |
format |
Article in Journal/Newspaper |
author |
Assmy, Philipp Cisewski, Boris Henjes, Joachim Klaas, Christine Montresor, Marina Smetacek, Victor |
author_facet |
Assmy, Philipp Cisewski, Boris Henjes, Joachim Klaas, Christine Montresor, Marina Smetacek, Victor |
author_sort |
Assmy, Philipp |
title |
Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
title_short |
Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
title_full |
Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
title_fullStr |
Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
title_full_unstemmed |
Response of the protozooplankton assemblage during the European Iron Fertilization Experiment (EIFEX) in the Antarctic circumpolar current |
title_sort |
response of the protozooplankton assemblage during the european iron fertilization experiment (eifex) in the antarctic circumpolar current |
publisher |
Oxford Univ Press |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00290/40091/39174.pdf https://archimer.ifremer.fr/doc/00290/40091/39177.pdf https://archimer.ifremer.fr/doc/00290/40091/39178.docx https://doi.org/10.1093/plankt/fbu068 https://archimer.ifremer.fr/doc/00290/40091/ |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Southern Ocean Copepods |
op_source |
Journal Of Plankton Research (0142-7873) (Oxford Univ Press), 2014-09 , Vol. 36 , N. 5 , P. 1175-1189 |
op_relation |
https://archimer.ifremer.fr/doc/00290/40091/39174.pdf https://archimer.ifremer.fr/doc/00290/40091/39177.pdf https://archimer.ifremer.fr/doc/00290/40091/39178.docx doi:10.1093/plankt/fbu068 https://archimer.ifremer.fr/doc/00290/40091/ |
op_rights |
The Author 2014. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oup.com info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1093/plankt/fbu068 |
container_title |
Journal of Plankton Research |
container_volume |
36 |
container_issue |
5 |
container_start_page |
1175 |
op_container_end_page |
1189 |
_version_ |
1766254144501317632 |