(Tables 2) The bPSi:POC ratio of the total diatom community, and abundance of full, empty, and broken diatom cells compared to heavily silicified diatoms during the EIFEX experiment ...

• Main Authors: Hoffmann, Linn, Peeken, Ilka, Lochte, Karin, Assmy, Philipp, Veldhuis, Marcel J W
• Format: Dataset
• Language: English
• Published: PANGAEA 2006
• Subjects: DEPTH, water; Day of experiment; Biogenic particulate silica/Carbon, organic, particulate; Diatoms; Ratio; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; Phytoplankton; Sea ice; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.848095; https://doi.pangaea.de/10.1594/PANGAEA.848095

During the European Iron Fertilisation Experiment (EIFEX), performed in the Southern Ocean, we investigated the reactions of different phytoplankton size classes to iron fertilization, applying measurements of size fractionated pigments, particulate organic matter, microscopy, and flow cytometry. Chlorophyll a (Chl a) concentrations at 20-m depth increased more than fivefold following fertilization through day 26, while concentrations of particulate organic carbon (POC), nitrogen (PON), and phosphorus (POP) roughly doubled through day 29. Concentrations of Chl a and particulate organic matter decreased toward the end of the experiment, indicating the demise of the iron-induced phytoplankton bloom. Despite a decrease in total diatom biomass at the end of the experiment, biogenic particulate silicate (bPSi) concentrations increased steadily due to a relative increase of heavily silicified diatoms. Although diatoms >10 µm were the main beneficiaries of iron fertilization, the growth of small diatoms (2-8 mm) ... : Please note: Thalassiothrix antarctica, Fragilariopsis kerguelensis, F. obliquecostata/ritscheri, Thalassiosira lentiginosa, Thalassionema nitzschioides, and Thalassiosira gracilis are here referred to as heavily silicified diatoms.Experiment was conducted at 49.3°S and 2.2°E during ANT-XXI/3 (2004-01-21 to 2004-03-25) ...