Publication Date:
2024-03-15
Description:
Previous studies have shown that increasing atmospheric CO2 concentrations affect calcification in some planktonic and macroalgal calcifiers due to the changed carbonate chemistry of seawater. However, little is known regarding how calcifying algae respond to solar UV radiation (UVR, UVA+UVB, 280-400 nm). UVR may act synergistically, antagonistically or independently with ocean acidification (high CO2/low pH of seawater) to affect their calcification processes. We cultured the articulated coralline alga Corallina sessilis Yendo at 380 ppmv (low) and 1000 ppmv (high) CO2 levels while exposing the alga to solar radiation treatments with or without UVR. The presence of UVR inhibited the growth, photosynthetic O2evolution and calcification rates by13%, 6% and 3% in the low and by 47%, 20% and 8% in the high CO2 concentrations, respectively, reflecting a synergistic effect of CO2 enrichment with UVR. UVR induced significant decline of pH in the CO2-enriched cultures. The contents of key photosynthetic pigments, chlorophyll a and phycobiliproteins decreased, while UV-absorptivity increased under the highpCO2/low pH condition. Nevertheless, UV-induced inhibition of photosynthesis increased when the ratio of particulate inorganic carbon/particulate organic carbon decreased under the influence of CO2-acidified seawater, suggesting that the calcified layer played a UV-protective role. Both UVA and UVB negatively impacted photosynthesis and calcification, but the inhibition caused by UVB was about 2.5-2.6 times that caused by UVA. The results imply that coralline algae suffer from more damage caused by UVB as they calcify less and less with progressing ocean acidification.
Keywords:
Alkalinity, total; Alkalinity, total, standard deviation; Alkalinity anomaly technique (Smith and Key, 1975); Aragonite saturation state; Benthos; Bicarbonate; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Calcification/Dissolution; Calcification rate, standard deviation; Calcification rate of calcium carbonate; Calcite saturation state; Calcite saturation state, standard deviation; Calculated; Calculated, see reference(s); Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carotenoids; Carotenoids, standard deviation; Chlorophyll a, standard deviation; Chlorophyll a per unit sediment mass; Coast and continental shelf; Corallina sessilis; Corallina sessilis, individual mass change; Corallina sessilis, individual mass change, standard deviation; Date; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Experiment day; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Infrared gas analyzer (CGT-7000); Laboratory experiment; Light; Macroalgae; Measured; Measured using a pH method; Net photosynthesis rate; Net photosynthesis rate, standard deviation; Nitrate; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Particulate inorganic carbon/particulate organic carbon ratio; Particulate inorganic carbon/particulate organic carbon ratio, standard deviation; pH; pH, standard deviation; pH meter (Mettler Toledo, USA); Phosphate; Phycoerythrin; Phycoerythrin, standard deviation; Plantae; Primary production/Photosynthesis; Radiation, photosynthetically active; Radiometer; Rhodophyta; RM; Salinity; see reference(s); Single species; Temperate; Temperature, water; Ultraviolet absorbing compounds; Ultraviolet absorbing compounds, standard deviation; Ultraviolet radiation-induced inhibition of calcification; Ultraviolet radiation-induced inhibition of calcification, standard deviation; Ultraviolet radiation-induced inhibition of photosynthesis; Ultraviolet radiation-induced inhibition of photosynthesis, standard deviation
Type:
Dataset
Format:
text/tab-separated-values, 496 data points
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