Phytoplankton species determination and counts determined from the community sampled at station West and East (PS97) before and after exposure to different Fe and Mn availabilities ...

• Main Authors: Balaguer, Jenna, Koch, Florian, Hassler, Christel S, Trimborn, Scarlett
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: co-limitation; Phytoplankton composition; Southern Ocean; trace elements; Event label; Experiment; Experimental treatment; Incubation duration; Chaetoceros sp.; Fragilariopsis sp.; Pseudo-nitzschia sp.; Phaeocystis antarctica; Membrane pump; Light microscopy Utermöhl 1958; PS97; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarctic; Arctic; Drake Passage; Antarc*; Antarctica; Phytoplankton; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.935864; https://doi.pangaea.de/10.1594/PANGAEA.935864

Two Fe-Mn bottle amendment experiments with two natural phytoplankton communities were performed during Polarstern expedition PS97 in 2016 in the Drake Passage. At two locations, sea water was pumped (using trace metals clean techniques) from 25m depth and used to fill polycarbonate bottles after having passed through a cleaned 200 μm mesh (removing large grazers). The Control treatment was the sampled seawater without any trace metals addition while the other three treatments were enriched with either FeCl3 alone (0.5 nM; +Fe treatment) or MnCl2 alone (1 nM; +Mn treatment) or both trace metals together (+FeMn treatment). All treatments were done in triplicate 2,5L PC bottles. All incubation bottles were maintained at 30 μmol photons m-2 s-1 under a 16:8 (light:dark) hour cycle at 1 ̊C. To determine the effects of the different treatments on the microplankton composition for the two Fe-Mn enrichment experiments, unfiltered seawater was collected at the start and the end of both experiments for later analysis ...