Publikationsdatum:
2024-03-15
Beschreibung:
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.
Schlagwort(e):
Alaria esculenta; Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Arctic; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, total; Carbon, total, standard deviation; Carbon/Nitrogen ratio; Carbon/Nitrogen ratio, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Carbon fixation rate; Carbon fixation rate, standard deviation; Chromista; Coast and continental shelf; Desmarestia aculeata; Dissolved organic carbon release rate; Dissolved organic carbon release rate, standard deviation; Electron transport rate; Electron transport rate, standard deviation; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Gross photosynthesis rate, standard deviation; Growth rate; Growth rate, standard deviation; Initial slope of rapid light curve; Initial slope of rapid light curve, standard deviation; Irradiance; Irradiance, standard deviation; KongsfjordenOA; Laboratory experiment; Light saturation; Light saturation, standard deviation; Macroalgae; Maximum photochemical quantum yield of photosystem II; Maximum photochemical quantum yield of photosystem II, standard deviation; Net photosynthesis rate, oxygen; Net photosynthesis rate, standard deviation; Nitrogen, standard deviation; Nitrogen, total; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate organic carbon release rate; Particulate organic carbon release rate, standard deviation; Percentage; pH; pH, standard deviation; Photosynthetic quotient; Photosynthetic quotient, standard deviation; Polar; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Ratio; Ratio, standard deviation; Respiration; Respiration rate, oxygen; Respiration rate, oxygen, standard deviation; Salinity; Salinity, standard deviation; Single species; Species; Temperature, water; Temperature, water, standard deviation; Treatment; δ13C; δ13C, standard deviation
Materialart:
Dataset
Format:
text/tab-separated-values, 292 data points
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