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Gieskes, W W C; Kraay, Gijsbert W (1980): Primary productivity and phytoplankton pigment measurements in the North Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.611525, Supplement to: Gieskes, WWC; Kraay, GW (1980): Primary productivity and phytoplankton pigment measurements in the northern North Sea during FLEX `76. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A22, 105-112

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Abstract:
During the culmination of the phytoplankton spring bloom in the Fladen Ground area in April-Mai 1976, gross primary production was between 1500 and 2000 mg particulate C m**-2 day**-1, at a crop density (mainly diatoms of the genus Chaetoceros) of about 1500-3500 mg C m**-2. Estimates of the C:chlorophyll a ratio in living cells were much lower than those reported in the literature, possibly because part of what is measured as "chlorophyll a" by the common fluorometric method is associated with particles that are not reported as cells. Most of the dark 14C fixation during the bloom's climax was due to abiotic processes. Excretion of 14C-labeled carbohydrates did not account for a significant fraction of the total photosynthetic rate. The low crop after the bloom period, in June, corresponded with nutrient depletion of the euphotic zone. The low photosynthetic efficiency in June may have been a gross underestimate.
The presence of relatively high concentrations of chlorophyll derivatives signifies that the algal crop was consumed by heterotrophs, but at a lower rate in April/May than during the June cruise when particularly high molar ratios of phaeophorbide a and phaeophytin a relative to chlorophyll a were found. The high respiratory rate relative to autotrophic production in June manifested itself also in high dark 14C fixation values. The high concentration of phaeophorbide a in the upper 40 m and its scarcity below this depth during the spring bloom climax in April/May implies that copepod grazing at that time took place principally in the euphotic zone. The remarkably high concentration of chlorophyllide a in the surface layer during the bloom period indicates that the part of the crop that was destroyed by the grazers while eating was occasionally as high as the part that was actually ingested.
Coverage:
Median Latitude: 58.935278 * Median Longitude: 0.658735 * South-bound Latitude: 58.850000 * West-bound Longitude: 0.366667 * North-bound Latitude: 59.050000 * East-bound Longitude: 1.000000
Date/Time Start: 1976-04-29T00:00:00 * Date/Time End: 1976-06-19T00:00:00
Event(s):
M41_1aWS * Latitude: 58.941667 * Longitude: 1.000000 * Date/Time: 1976-04-29T00:00:00 * Location: North Sea * Campaign: M41 (FLEX 76 - Fladen Ground Experiment) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
M41_1bWS * Latitude: 58.850000 * Longitude: 0.366667 * Date/Time: 1976-04-29T00:00:00 * Location: North Sea * Campaign: M41 (FLEX 76 - Fladen Ground Experiment) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
M41_1WS * Latitude Start: 58.900000 * Longitude Start: 0.533333 * Latitude End: 58.900000 * Longitude End: 0.583333 * Date/Time: 1976-04-29T00:00:00 * Location: North Sea * Campaign: M41 (FLEX 76 - Fladen Ground Experiment) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Gieskes, WWC; Kraay, GW (1980): Primary productivity in the FLEX box, North Sea (Table 1). https://doi.org/10.1594/PANGAEA.611524
  2. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_1aWS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602265
  3. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_1bWS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602266
  4. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_1WS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602267
  5. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_2WS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602268
  6. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_3WS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602269
  7. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_4WS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602270
  8. Gieskes, WWC; Kraay, GW (1980): Phytoplankton biomass and chlorophyll a concentrations measured on water samples of station M41_7WS in the northern North Sea (Table 3). https://doi.org/10.1594/PANGAEA.602271
  9. Gieskes, WWC; Kraay, GW (1980): Nutrient concentrations measured in the northern North Sea (Table 5). https://doi.org/10.1594/PANGAEA.602272