Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384
The dynamics, composition and grazing impact of microzooplankton were studied during the in situ iron fertilisation experiment EisenEx in the Antarctic Polar Frontal Zone in austral spring (November 2000). During the 21 day experiment, protozooplankton and small metazooplankton were sampled from the...
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ftdatacite:10.1594/pangaea.558112 2023-05-15T13:47:06+02:00 Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 Henjes, Joachim Assmy, Philipp Klaas, Christine Verity, Peter Smetacek, Victor 2006 application/zip https://dx.doi.org/10.1594/pangaea.558112 https://doi.pangaea.de/10.1594/PANGAEA.558112 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.dsr.2006.12.004 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx Collection article Supplementary Collection of Datasets 2006 ftdatacite https://doi.org/10.1594/pangaea.558112 https://doi.org/10.1016/j.dsr.2006.12.004 2021-11-05T12:55:41Z The dynamics, composition and grazing impact of microzooplankton were studied during the in situ iron fertilisation experiment EisenEx in the Antarctic Polar Frontal Zone in austral spring (November 2000). During the 21 day experiment, protozooplankton and small metazooplankton were sampled from the mixed layer inside and outside the patch using Niskin bottles. Aplastidic dinoflagellates increased threefold in abundance and biomass in the first 10 d of the experiment, but decreased thereafter to values twofold higher than pre-fertilisation values. The decline after day 10 is attributed to increasing grazing pressure by copepods. They also constrained ciliate abundances and biomass which were higher inside the fertilised patch than outside but highly variable. Copepod nauplii abundance also remained stable whereas biomass doubled. Numbers of copepodites and adults of small copepod species increased threefold inside the patch, but doubled in surrounding waters. Grazing rates estimated using the dilution method suggest that microzooplankton grazing constrained pico- and nanoplankton populations, but species capable of feeding on large diatoms (dinoflagellates and small copepods including possibly nauplii) were selectively predated by the metazoan community. Thus, iron fertilisation of a developing spring phytoplankton assemblage resulted in a trophic cascade which favoured dominance of the bloom by large diatoms. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Copepods DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Austral |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx |
spellingShingle |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx Henjes, Joachim Assmy, Philipp Klaas, Christine Verity, Peter Smetacek, Victor Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
topic_facet |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx |
description |
The dynamics, composition and grazing impact of microzooplankton were studied during the in situ iron fertilisation experiment EisenEx in the Antarctic Polar Frontal Zone in austral spring (November 2000). During the 21 day experiment, protozooplankton and small metazooplankton were sampled from the mixed layer inside and outside the patch using Niskin bottles. Aplastidic dinoflagellates increased threefold in abundance and biomass in the first 10 d of the experiment, but decreased thereafter to values twofold higher than pre-fertilisation values. The decline after day 10 is attributed to increasing grazing pressure by copepods. They also constrained ciliate abundances and biomass which were higher inside the fertilised patch than outside but highly variable. Copepod nauplii abundance also remained stable whereas biomass doubled. Numbers of copepodites and adults of small copepod species increased threefold inside the patch, but doubled in surrounding waters. Grazing rates estimated using the dilution method suggest that microzooplankton grazing constrained pico- and nanoplankton populations, but species capable of feeding on large diatoms (dinoflagellates and small copepods including possibly nauplii) were selectively predated by the metazoan community. Thus, iron fertilisation of a developing spring phytoplankton assemblage resulted in a trophic cascade which favoured dominance of the bloom by large diatoms. |
format |
Article in Journal/Newspaper |
author |
Henjes, Joachim Assmy, Philipp Klaas, Christine Verity, Peter Smetacek, Victor |
author_facet |
Henjes, Joachim Assmy, Philipp Klaas, Christine Verity, Peter Smetacek, Victor |
author_sort |
Henjes, Joachim |
title |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
title_short |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
title_full |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
title_fullStr |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
title_full_unstemmed |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic, supplement to: Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2007): Response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the Southern Ocean (EisenEx). Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 363-384 |
title_sort |
abundance of microzooplankton determined during the eisenex cruise ant-xviii/2 to the south atlantic, supplement to: henjes, joachim; assmy, philipp; klaas, christine; verity, peter; smetacek, victor (2007): response of microzooplankton (protists and small copepods) to an iron-induced phytoplankton bloom in the southern ocean (eisenex). deep sea research part i: oceanographic research papers, 54(3), 363-384 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2006 |
url |
https://dx.doi.org/10.1594/pangaea.558112 https://doi.pangaea.de/10.1594/PANGAEA.558112 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Southern Ocean Copepods |
genre_facet |
Antarc* Antarctic Southern Ocean Copepods |
op_relation |
https://dx.doi.org/10.1016/j.dsr.2006.12.004 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.558112 https://doi.org/10.1016/j.dsr.2006.12.004 |
_version_ |
1766246355882213376 |