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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. 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 * 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 * 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 * Device: CTD/Rosette (CTD-RO) * Comment: max gear depth: 500 m; out patch 1; in/out patch: Out; day: T1
Size:
38 datasets

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Datasets listed in this Collection

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