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Henjes, Joachim; Assmy, Philipp; Klaas, Christine; Verity, Peter; Smetacek, Victor (2006): Abundance of microzooplankton determined during the EisenEx cruise ANT-XVIII/2 to the South Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.558112, Supplement to: Henjes, J et al. (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

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Abstract:
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.
Project(s):
European Iron Enrichment Experiment in the Southern Ocean (EisenEx)
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
Event(s):
PS58/009-2 (CTD9) * Latitude: -47.821000 * Longitude: 20.750000 * Date/Time: 2000-11-06T23:25:00 * Elevation: -4852.0 m * Location: South Atlantic * Campaign: ANT-XVIII/2 (PS58 EISENEX) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: max gear depth: 269 m; day: T-2
PS58/011-1 * Latitude: -47.878000 * Longitude: 20.948667 * Date/Time: 2000-11-08T20:30:00 * Elevation: -4498.0 m * Location: South Atlantic * Campaign: ANT-XVIII/2 (PS58 EISENEX) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: max gear depth: 502 m; in patch 1; in/out patch: In; day: T0
PS58/012-5 (CTD16) * Latitude: -48.104833 * Longitude: 20.862333 * Date/Time: 2000-11-09T13:01:00 * Elevation: -4570.0 m * Location: South Atlantic * Campaign: ANT-XVIII/2 (PS58 EISENEX) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO) * Comment: max gear depth: 500 m; out patch 1; in/out patch: Out; day: T1
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
38 datasets

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Datasets listed in this publication series

  1. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/009-2. https://doi.org/10.1594/PANGAEA.552469
  2. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/009-2. https://doi.org/10.1594/PANGAEA.552483
  3. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/011-1. https://doi.org/10.1594/PANGAEA.552521
  4. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/011-1. https://doi.org/10.1594/PANGAEA.552542
  5. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/012-5. https://doi.org/10.1594/PANGAEA.552522
  6. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/012-5. https://doi.org/10.1594/PANGAEA.552543
  7. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/014-4. https://doi.org/10.1594/PANGAEA.552523
  8. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/014-4. https://doi.org/10.1594/PANGAEA.552544
  9. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/038-3. https://doi.org/10.1594/PANGAEA.552524
  10. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/038-3. https://doi.org/10.1594/PANGAEA.552545
  11. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/041-2. https://doi.org/10.1594/PANGAEA.552527
  12. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/041-2. https://doi.org/10.1594/PANGAEA.552546
  13. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/042-2. https://doi.org/10.1594/PANGAEA.552528
  14. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/042-2. https://doi.org/10.1594/PANGAEA.552547
  15. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/043-2. https://doi.org/10.1594/PANGAEA.552529
  16. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/043-2. https://doi.org/10.1594/PANGAEA.552548
  17. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/045-2. https://doi.org/10.1594/PANGAEA.552530
  18. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/045-2. https://doi.org/10.1594/PANGAEA.552549
  19. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/046-3. https://doi.org/10.1594/PANGAEA.552531
  20. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/046-3. https://doi.org/10.1594/PANGAEA.552550
  21. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/048-3. https://doi.org/10.1594/PANGAEA.552532
  22. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/048-3. https://doi.org/10.1594/PANGAEA.552551
  23. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/049-3. https://doi.org/10.1594/PANGAEA.552534
  24. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/049-3. https://doi.org/10.1594/PANGAEA.552552
  25. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/061-1. https://doi.org/10.1594/PANGAEA.552535
  26. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/061-1. https://doi.org/10.1594/PANGAEA.552553
  27. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/088-4. https://doi.org/10.1594/PANGAEA.552536
  28. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/088-4. https://doi.org/10.1594/PANGAEA.552554
  29. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/090-4. https://doi.org/10.1594/PANGAEA.552537
  30. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/090-4. https://doi.org/10.1594/PANGAEA.552555
  31. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/091-4. https://doi.org/10.1594/PANGAEA.552538
  32. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/091-4. https://doi.org/10.1594/PANGAEA.552556
  33. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/092-3. https://doi.org/10.1594/PANGAEA.552539
  34. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/092-3. https://doi.org/10.1594/PANGAEA.552557
  35. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/107-5. https://doi.org/10.1594/PANGAEA.552540
  36. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/107-5. https://doi.org/10.1594/PANGAEA.552558
  37. Henjes, J (2006): Microzooplankton abundance measured on water bottle samples at station PS58/108-1. https://doi.org/10.1594/PANGAEA.552541
  38. Henjes, J (2006): Microzooplankton biomass measured on water bottle samples at station PS58/108-1. https://doi.org/10.1594/PANGAEA.552559