Seawater carbonate chemistry and growth, elemental composition,biomass production, respiration and carbon acquisition of diatoms Thalassiosira hyalina and Melosira arctica ...

• Main Authors: Wolf, Klara K E, Rokitta, Sebastian D, Hoppe, Clara Jule Marie, Rost, Björn
• Format: Dataset
• Language: English
• Published: PANGAEA 2022
• Subjects: Arctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Chromista; Growth/Morphology; Laboratory experiment; Light; Melosira arctica; Ochrophyta; Open ocean; Pelagos; Phytoplankton; Polar; Primary production/Photosynthesis; Respiration; Single species; Thalassiosira hyalina; Event label; Type; Species, unique identification; Species, unique identification URI; Species, unique identification Semantic URI; Irradiance; Treatment partial pressure of carbon dioxide; Identification; Maximum light use efficiency; Electron transport rate, relative, maximum velocity; Light saturation point; Electron transport rate, relative; Maximum photochemical quantum yield of photosystem II; Non photochemical quenching; Reopening rate; Antenna size; Connectivity between photosystem II; Photosynthetic efficiency, carbon production; Net photosynthesis rate, oxygen, per chlorophyll a; Respiration rate, oxygen, per chlorophyll a; Net photosynthesis rate, carbon dioxide, per chlorophyll a; Percentage; Photosynthetic quotient; Net photosynthesis rate, oxygen, per particulate organic carbon; Growth rate; Carbon, organic, particulate, per cell; Chlorophyll a per cell; Biogenic silica, per cell; Carbon, organic, particulate, production per cell; Chlorophyll a/particulate organic carbon ratio; Biogenic silica/Carbon, organic, particulate; Carbon/Nitrogen ratio; Ratio; Arctic Ocean; Ocean acidification; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.951402; https://doi.pangaea.de/10.1594/PANGAEA.951402

Sea ice retreat, changing stratification, and ocean acidification are fundamentally changing the light availability and physico-chemical conditions for primary producers in the Arctic Ocean. However, detailed studies on ecophysiological strategies and performance of key species in the pelagic and ice-associated habitat remain scarce. Therefore, we investigated the acclimated responses of the diatoms Thalassiosira hyalina and Melosira arctica toward elevated irradiance and CO2 partial pressures (pCO2). Next to growth, elemental composition, and biomass production, we assessed detailed photophysiological responses through fluorometry and gas-flux measurements, including respiration and carbon acquisition. In the pelagic T. hyalina, growth rates remained high in all treatments and biomass production increased strongly with light. Even under low irradiances cells maintained a high-light acclimated state, allowing them to opportunistically utilize high irradiances by means of a highly plastic photosynthetic ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2022-11-30. ...