Grazing rate of microzooplankton measured experimentally in the North Atlantic during the Maria S. Merian cruise MSM26, spring 2013 ...

• Main Authors: Hänselmann, Kristin, Walter, Bettina
• Format: Dataset
• Language: English
• Published: PANGAEA 2013
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; DEPTH, water; Duration; Dilution; Copepoda; Light intensity; Temperature, water; Experiment; Chlorophyll a; Growth rate; CTD/Rosette; MSM26; Maria S. Merian; Basin Scale Analysis, Synthesis and Integration EURO-BASIN; Christoffersen; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.819256; https://doi.pangaea.de/10.1594/PANGAEA.819256

The microzooplankton grazing dilution experiments were conducted at stations 126, 127, 131 and 133-137, following Landry & Hassett (1982). Seawater samples (whole seawater – WSW) were taken via Niskin bottles mounted on to a CTD Rosette out of the chlorophyll maximum at each station. Four different dilution levels were prepared with WSW and GF/F filtered seawater – 100% WSW, 75% WSW, 50% WSW and 25% WSW. The diluted WSW was filled in 2.4 L polycarbonate bottles (two replicates for every dilution level). Three subsamples (250 - 500 mL depending on in situ chlorophyll) of the 100% WSW were filtered on to GF/F filters (25 mm diameter) and chlorophyll was extracted in 5 mL 96% ethanol for 12-24 hours. Afterwards it was measured fluorometrically before and after the addition of HCl with a Turner fluorometer according to Jespersen and Christoffersen (1987) on board of the ship. In addition, one 250 mL subsample of the 100% WSW was fixed in 2% Lugol (final concentration), to determine the microzooplankton ...