Increased CO2 modifies the carbon balance and the photosynthetic yield of two common Arctic brown seaweeds: Desmarestia aculeata and Alaria esculenta, supplement to: Iñiguez, Concepcion; Carmona, Raquel; Lorenzo, M Rosario; Niell, F Xavier; Wiencke, Christian; Gordillo, Francisco J L (2016): Increased CO2 modifies the carbon balance and the photosynthetic yield of two common Arctic brown seaweeds: Desmarestia aculeata and Alaria esculenta. Polar Biology, 39(11), 1979-1991

• Main Authors: Iñiguez, Concepcion, Carmona, Raquel, Lorenzo, M Rosario, Niell, F Xavier, Wiencke, Christian, Gordillo, Francisco J L
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2015
• Subjects: Alaria esculenta; Arctic; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Chromista; Coast and continental shelf; Desmarestia aculeata; Laboratory experiment; Macroalgae; Ochrophyta; Polar; Primary production/Photosynthesis; Respiration; Single species; Species; Treatment; Growth rate; Growth rate, standard deviation; Net photosynthesis rate, oxygen; Net photosynthesis rate, standard deviation; Gross photosynthesis rate, oxygen; Gross photosynthesis rate, standard deviation; Carbon fixation rate; Carbon fixation rate, standard deviation; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Dissolved organic carbon release rate; Dissolved organic carbon release rate, standard deviation; Particulate organic carbon release rate; Particulate organic carbon release rate, standard deviation; Percentage; Photosynthetic quotient; Photosynthetic quotient, standard deviation; Electron transport rate; Electron transport rate, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Light saturation; Light saturation, standard deviation; Irradiance; Irradiance, standard deviation; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Carbon, total; Carbon, total, standard deviation; Nitrogen, total; Nitrogen, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; δ13C; δ13C, standard deviation; Ratio; Ratio, standard deviation; Temperature, water; Temperature, water, standard deviation; Salinity; Salinity, standard deviation; pH; pH, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Carbon dioxide; Carbon dioxide, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcite saturation state; Experiment; Potentiometric; Calculated using CO2calc; Potentiometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Svalbard; Rosario; Carmona; Wiencke; Kongsfjord*; Kongsfjorden; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.849401; https://doi.pangaea.de/10.1594/PANGAEA.849401

Ocean acidification affects with special intensity Arctic ecosystems, being marine photosynthetic organisms a primary target, although the consequences of this process in the carbon fluxes of Arctic algae are still unknown. The alteration of the cellular carbon balance due to physiological acclimation to an increased CO2 concentration (1300 ppm) in the common Arctic brown seaweeds Desmarestia aculeata and Alaria esculenta from Kongsfjorden (Svalbard) was analysed. Growth rate of D. aculeata was negatively affected by CO2 enrichment, while A. esculenta was positively affected, as a result of a different reorganization of the cellular carbon budget in both species. Desmarestia aculeata showed increased respiration, enhanced accumulation of storage biomolecules and elevated release of dissolved organic carbon, whereas A. esculenta showed decreased respiration and lower accumulation of storage biomolecules. Gross photosynthesis (measured both as O2 evolution and 14C fixation) was not affected in any of them, suggesting that photosynthesis was already saturated at normal CO2 conditions and did not participate in the acclimation response. However, electron transport rate changed in both species in opposite directions, indicating different energy requirements between treatments and species specificity. High CO2 levels also affected the N-metabolism, and 13C isotopic discrimination values from algal tissue pointed to a deactivation of carbon concentrating mechanisms. Since increased CO2 has the potential to modify physiological mechanisms in different ways in the species studied, it is expected that this may lead to changes in the Arctic seaweed community, which may propagate to the rest of the food web. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2015-09-15.