Publication Date:
2024-03-15
Description:
The Arctic population of the kelp Saccharina latissima differs from the Helgoland population in its sensitivity to changing temperature and CO2 levels. The Arctic population does more likely benefit from the upcoming environmental scenario than its Atlantic counterpart. The previous research demonstrated that warming and ocean acidification (OA) affect the biochemical composition of Arctic (Spitsbergen; SP) and cold-temperate (Helgoland; HL) Saccharina latissima differently, suggesting ecotypic differentiation. This study analyses the responses to different partial pressures of CO2 (380, 800, and 1500 µatm pCO2) and temperature levels (SP population: 4, 10 °C; HL population: 10, 17 °C) on the photophysiology (O2 production, pigment composition, D1-protein content) and carbon assimilation [Rubisco content, carbon concentrating mechanisms (CCMs), growth rate] of both ecotypes. Elevated temperatures stimulated O2 production in both populations, and also led to an increase in pigment content and a deactivation of CCMs, as indicated by 13C isotopic discrimination of algal biomass (εp) in the HL population, which was not observed in SP thalli. In general, pCO2 effects were less pronounced than temperature effects. High pCO2 deactivated CCMs in both populations and produced a decrease in the Rubisco content of HL thalli, while it was unaltered in SP population. As a result, the growth rate of the Arctic ecotype increased at elevated pCO2 and higher temperatures and it remained unchanged in the HL population. Ecotypic differentiation was revealed by a significantly higher O2 production rate and an increase in Chl a, Rubisco, and D1 protein content in SP thalli, but a lower growth rate, in comparison to the HL population. We conclude that both populations differ in their sensitivity to changing temperatures and OA and that the Arctic population is more likely to benefit from the upcoming environmental scenario than its Atlantic counterpart.
Keywords:
Alkalinity, total; Alkalinity, total, standard deviation; Antheraxanthin; Antheraxanthin, standard deviation; Antheraxanthin/chlorophyll a ratio; Antheraxanthin/chlorophyll a ratio, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Arctic; Benthos; beta-Carotene; beta-Carotene, standard deviation; Beta-Carotene/chlorophyll a ratio; Beta-Carotene/chlorophyll a ratio, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Calculated using seacarb after Orr et al. (2018); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per unit dry mass; Chlorophyll c; Chlorophyll c, standard deviation; Chlorophyll c2/chlorophyll a ratio; Chlorophyll c2/chlorophyll a ratio, standard deviation; Chromista; Coast and continental shelf; D1 protein, relative intensity; D1 protein, relative intensity, standard deviation; De-epoxidation state; De-epoxidation state, standard deviation; Effective quantum yield; Effective quantum yield, standard deviation; Fucoxanthin; Fucoxanthin, standard deviation; Fucoxanthin/chlorophyll a ratio; Fucoxanthin/chlorophyll a ratio, standard devitation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Fugacity of carbon dioxide in seawater, standard deviation; Growth, relative, standard deviation; Growth/Morphology; Growth rate; Isotopic fractionation, during photosynthis; Isotopic fractionation, during photosynthis, standard deviation; Laboratory experiment; Macroalgae; Net photosynthesis rate; Net photosynthesis rate, oxygen; Net photosynthesis rate, oxygen, per chlorophyll a; Net photosynthesis rate, standard deviation; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Ochrophyta; Other studied parameter or process; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; pH, standard deviation; Phlorotannins; Phlorotannins, standard deviation; Pigments, accessory; Pigments, accessory, standard deviation; Pigments, accessory/chlorophyll a ratio; Pigments, accessory/chlorophyll a ratio, standard deviation; Pigments, violaxanthin-xanthophyll-cycle/chlorophyll a ratio; Pigments, violaxanthin-xanthophyll-cycle/chlorophyll a ratio, standard deviation; Polar; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Proteins, total; Proteins, total, standard deviation; Rubisco, per dry mass; Rubisco, per protein; Rubisco content per dry mass, standard deviation; Rubisco content per protein, standard deviation; Saccharina latissima; Salinity; Salinity, standard deviation; Single species; Site; Species; Temperate; Temperature; Temperature, water; Temperature, water, standard deviation; Treatment: partial pressure of carbon dioxide; Treatment: temperature; Type of study; Violaxanthin; Violaxanthin, standard deviation; Violaxanthin/chlorophyll a ratio; Violaxanthin/chlorophyll a ratio, standard deviation; Violaxanthin-xanthophyll-cycle pigments; Violaxanthin-xanthophyll-cycle pigments, standard deviation; Zeaxanthin; Zeaxanthin, standard deviation; Zeaxanthin/chlorophyll a ratio; Zeaxanthin/chlorophyll a ratio, standard deviation
Type:
Dataset
Format:
text/tab-separated-values, 1152 data points
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