Photophysiological responses of Southern Ocean phytoplankton to changes in CO2 concentrations: Short-term versus acclimation effects ...

• Main Authors: Trimborn, Scarlett, Thoms, Silke, Petrou, Katherina, Kranz, Sven A, Rost, Björn
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Antarctic; Bottles or small containers/Aquaria <20 L; Chaetoceros debilis; Chromista; Fragilariopsis kerguelensis; Haptophyta; Laboratory experiment; Laboratory strains; Ochrophyta; Pelagos; Phaeocystis antarctica; Phytoplankton; Primary production/Photosynthesis; Pseudo-nitzschia subcurvata; Respiration; Single species; Figure; Species; Partial pressure of carbon dioxide water at sea surface temperature wet air; Treatment; Carbon dioxide; Irradiance; Effective absorbance cross-section of photosystem II; Non photochemical quenching; Electron transport rate, relative; Effective quantum yield; Re-oxidation time of the Qa acceptor; Re-oxidation time of the Qa acceptor, standard deviation; Connectivity between photosystem II; Connectivity between photosystem II, standard deviation; Table; Gross oxygen evolution, per chlorophyll a; Gross oxygen evolution, standard deviation; Net oxygen evolution, per chlorophyll a; Net oxygen evolution, per chlorophyll a, standard deviation; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Partial pressure of carbon dioxide, standard deviation; Carbon dioxide, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; pH, NBS scale; pH, standard deviation; Temperature, water; Salinity; Carbonate system computation flag; pH, total scale; Fugacity of carbon dioxide water at sea surface temperature wet air; Southern Ocean; Antarc*; Antarctica; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.833713; https://doi.pangaea.de/10.1594/PANGAEA.833713

The present study examines how different pCO2 acclimations affect the CO2- and light-dependence of photophysiological processes and O2 fluxes in four Southern Ocean (SO) key phytoplankton species. We grew Chaetoceros debilis (Cleve), Pseudo-nitzschia subcurvata (Hasle), Fragilariopsis kerguelensis (O'Meara) and Phaeocystis antarctica (Karsten) under low (160 µatm) and high (1000 ?atm) pCO2. The CO2- and light-dependence of fluorescence parameters of photosystem II (PSII) were determined by means of a fluorescence induction relaxation system (FIRe). In all tested species, nonphotochemical quenching (NPQ) is the primary photoprotection strategy in response to short-term exposure to high light or low CO2 concentrations. In C. debilis and P. subcurvata, PSII connectivity (p) and functional absorption cross-sections of PSII in ambient light (sigma PSII') also contributed to photoprotection while changes in re-oxidation times of Qa acceptor (tQa) were more significant in F. kerguelensis. The latter was also the ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 is 2014-07-01. ...