Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic
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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2006
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.558112 2023-05-15T13:42:09+02:00 Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic Henjes, Joachim Assmy, Philipp Klaas, Christine Verity, Peter Smetacek, Victor MEDIAN LATITUDE: -48.077158 * MEDIAN LONGITUDE: 20.929798 * SOUTH-BOUND LATITUDE: -48.593000 * WEST-BOUND LONGITUDE: 20.647333 * NORTH-BOUND LATITUDE: -47.668167 * EAST-BOUND LONGITUDE: 21.168667 * DATE/TIME START: 2000-11-06T23:25:00 * DATE/TIME END: 2000-11-29T15:33:00 2006-12-19 application/zip, 38 datasets https://doi.pangaea.de/10.1594/PANGAEA.558112 https://doi.org/10.1594/PANGAEA.558112 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.558112 https://doi.org/10.1594/PANGAEA.558112 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY 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, https://doi.org/10.1016/j.dsr.2006.12.004 ANT-XVIII/2 CTD/Rosette CTD117 CTD123 CTD126 CTD128 CTD145 CTD149 CTD16 CTD18 CTD45 CTD51 CTD54 CTD57 CTD61 CTD66 CTD70 CTD74 CTD87 CTD9 CTD-RO EisenEx European Iron Enrichment Experiment in the Southern Ocean Polarstern PS58/009-2 PS58/011-1 PS58/012-5 PS58/014-4 PS58/038-3 PS58/041-2 PS58/042-2 PS58/043-2 PS58/045-2 PS58/046-3 PS58/048-3 PS58/049-3 PS58/061-1 PS58/088-4 PS58/090-4 PS58/091-4 PS58/092-3 PS58/107-5 PS58/108-1 PS58 EISENEX South Atlantic Dataset 2006 ftpangaea https://doi.org/10.1594/PANGAEA.558112 https://doi.org/10.1016/j.dsr.2006.12.004 2023-01-20T07:31:01Z 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. Dataset Antarc* Antarctic Southern Ocean Copepods PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Southern Ocean The Antarctic Austral ENVELOPE(20.647333,21.168667,-47.668167,-48.593000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ANT-XVIII/2 CTD/Rosette CTD117 CTD123 CTD126 CTD128 CTD145 CTD149 CTD16 CTD18 CTD45 CTD51 CTD54 CTD57 CTD61 CTD66 CTD70 CTD74 CTD87 CTD9 CTD-RO EisenEx European Iron Enrichment Experiment in the Southern Ocean Polarstern PS58/009-2 PS58/011-1 PS58/012-5 PS58/014-4 PS58/038-3 PS58/041-2 PS58/042-2 PS58/043-2 PS58/045-2 PS58/046-3 PS58/048-3 PS58/049-3 PS58/061-1 PS58/088-4 PS58/090-4 PS58/091-4 PS58/092-3 PS58/107-5 PS58/108-1 PS58 EISENEX South Atlantic |
spellingShingle |
ANT-XVIII/2 CTD/Rosette CTD117 CTD123 CTD126 CTD128 CTD145 CTD149 CTD16 CTD18 CTD45 CTD51 CTD54 CTD57 CTD61 CTD66 CTD70 CTD74 CTD87 CTD9 CTD-RO EisenEx European Iron Enrichment Experiment in the Southern Ocean Polarstern PS58/009-2 PS58/011-1 PS58/012-5 PS58/014-4 PS58/038-3 PS58/041-2 PS58/042-2 PS58/043-2 PS58/045-2 PS58/046-3 PS58/048-3 PS58/049-3 PS58/061-1 PS58/088-4 PS58/090-4 PS58/091-4 PS58/092-3 PS58/107-5 PS58/108-1 PS58 EISENEX South Atlantic 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 |
topic_facet |
ANT-XVIII/2 CTD/Rosette CTD117 CTD123 CTD126 CTD128 CTD145 CTD149 CTD16 CTD18 CTD45 CTD51 CTD54 CTD57 CTD61 CTD66 CTD70 CTD74 CTD87 CTD9 CTD-RO EisenEx European Iron Enrichment Experiment in the Southern Ocean Polarstern PS58/009-2 PS58/011-1 PS58/012-5 PS58/014-4 PS58/038-3 PS58/041-2 PS58/042-2 PS58/043-2 PS58/045-2 PS58/046-3 PS58/048-3 PS58/049-3 PS58/061-1 PS58/088-4 PS58/090-4 PS58/091-4 PS58/092-3 PS58/107-5 PS58/108-1 PS58 EISENEX South Atlantic |
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 |
Dataset |
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 |
title_short |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic |
title_full |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic |
title_fullStr |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic |
title_full_unstemmed |
Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic |
title_sort |
abundance of microzooplankton determined during the eisenex cruise ant-xviii/2 to the south atlantic |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.558112 https://doi.org/10.1594/PANGAEA.558112 |
op_coverage |
MEDIAN LATITUDE: -48.077158 * MEDIAN LONGITUDE: 20.929798 * SOUTH-BOUND LATITUDE: -48.593000 * WEST-BOUND LONGITUDE: 20.647333 * NORTH-BOUND LATITUDE: -47.668167 * EAST-BOUND LONGITUDE: 21.168667 * DATE/TIME START: 2000-11-06T23:25:00 * DATE/TIME END: 2000-11-29T15:33:00 |
long_lat |
ENVELOPE(20.647333,21.168667,-47.668167,-48.593000) |
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_source |
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, https://doi.org/10.1016/j.dsr.2006.12.004 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.558112 https://doi.org/10.1594/PANGAEA.558112 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.558112 https://doi.org/10.1016/j.dsr.2006.12.004 |
_version_ |
1766163203553755136 |