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Becquevort, Sylvie (1997): Biomass of nanoprotozooplankton in the Atlantic sector of the Southern Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.736976, Supplement to: Becquevort, S (1997): Nanoprotozooplankton in the Atlantic sector of the Southern Ocean during early spring: biomass and feeding activities. Deep Sea Research Part II: Topical Studies in Oceanography, 44(1-2), 355-373, https://doi.org/10.1016/S0967-0645(96)00076-8

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Abstract:
The dynamic of early spring nanoprotozoa was investigated in three characteristic water masses of the Southern Ocean: the Marginal Ice Zone, the intermediate waters of the Antarctic Circumpolar Current and the Polar Frontal Zone. Biomass and feeding activities of nanoprotozoa were measured, as well as the biomass of their potential prey-bacteria and phototrophic flagellates-on the 6°W meridian in the Southern Ocean along three repetitive transects between 47 and 60° South from October to November 1992. On average, nanoprotozooplankton biomass accounted for 77% of the combined biomass of bacteria and phototrophic flagellates, and was dominated by dinoflagellates and flagellates smaller than 5 µm. As a general trend, low protozoan biomass of 2 mg C/m**3 was typical of the ice covered area, while significantly higher biomasses culminating at 15 mg C/m**3 were recorded at the Polar Front. Biomasses of bacteria and total phytoplankton were distributed accordingly, with larger values at the Polar Front. Phototrophic flagellates did not show any geographical trend. No seasonal trend could be identified in the Marginal Ice Zone and in the intermediate waters of the Antarctic Circumpolar Current. On the other hand, at the Polar Front region a three-fold increase was observed within a 2-month period for nanoprotozooplankton biomass. Such a biomass increase was also detected for bacterioplankton and total phytoplankton biomass.
Half-saturation constants and maximum specific ingestion of nanoprotozoan taxons feeding on bacteria and phototrophic flagellates were determined using the technique of fluorescent labelled bacteria (FLB) and algae (FLA) over a large range of prey concentrations. Maximum ingestion rates ranged between 0.002 and 0.015/h for bactivorous nanoprotozoa and heterotrophic flagellates larger than 5 µm feeding on phototrophic flagellates. The markedly high maximum ingestion rates of 0.4/h characterising nanophytoplankton ingestion by dinoflagellates evidenced the strong ability of dinoflagellates for feeding on nanophytoplankton.
Daily ingestion rates were calculated from nanoprotozoan grazing parameters and carbon biomass of prey and predators. This indicated that nanoprotozoa ingestion of daily bacterioplankton and phytoplankton production in early spring ranged from 32 to 40%.
Coverage:
Median Latitude: -58.460417 * Median Longitude: 62.502083 * South-bound Latitude: -66.683333 * West-bound Longitude: 61.833333 * North-bound Latitude: -49.000000 * East-bound Longitude: 70.333333
Date/Time Start: 1994-02-10T00:00:00 * Date/Time End: 1994-03-08T00:00:00
Event(s):
ANTARES-II_A01 * Latitude: -52.000000 * Longitude: 62.000000 * Date/Time: 1994-02-10T00:00:00 * Campaign: MD78 (ANTARES-II) * Basis: Marion Dufresne (1972) * Method/Device: Oceanography (OCE)
ANTARES-II_A04 * Latitude: -63.000000 * Longitude: 70.333333 * Date/Time: 1994-02-18T00:00:00 * Campaign: MD78 (ANTARES-II) * Basis: Marion Dufresne (1972) * Method/Device: Oceanography (OCE)
ANTARES-II_A05 * Latitude: -66.683333 * Longitude: 61.866667 * Date/Time: 1994-02-23T00:00:00 * Campaign: MD78 (ANTARES-II) * Basis: Marion Dufresne (1972) * Method/Device: Oceanography (OCE)
Size:
16 datasets

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Datasets listed in this publication series

  1. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A01. https://doi.org/10.1594/PANGAEA.136595
  2. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A04. https://doi.org/10.1594/PANGAEA.136597
  3. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A05. https://doi.org/10.1594/PANGAEA.136598
  4. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A06. https://doi.org/10.1594/PANGAEA.136599
  5. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A07. https://doi.org/10.1594/PANGAEA.136600
  6. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A08. https://doi.org/10.1594/PANGAEA.136601
  7. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A09. https://doi.org/10.1594/PANGAEA.136602
  8. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A10. https://doi.org/10.1594/PANGAEA.136603
  9. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A11. https://doi.org/10.1594/PANGAEA.136604
  10. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A12. https://doi.org/10.1594/PANGAEA.136605
  11. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A13. https://doi.org/10.1594/PANGAEA.136606
  12. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A14. https://doi.org/10.1594/PANGAEA.136607
  13. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A15. https://doi.org/10.1594/PANGAEA.136608
  14. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A16. https://doi.org/10.1594/PANGAEA.136609
  15. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A17. https://doi.org/10.1594/PANGAEA.136610
  16. Becquevort, S (1997): Nano- and microprotozoa biomass and ingestion rates at station ANTARES-II_A18. https://doi.org/10.1594/PANGAEA.136611