Seawater carbonate chemistry and acclimatization of a coral-dinoflagellate mutualism at a CO2 vent ...

• Main Authors: Prada, Fiorella, Franzellitti, Silvia, Caroselli, Erik, Cohen, Itay, Marini, Mauro, Campanelli, Alessandra, Sana, Lorenzo, Mancuso, Arianna, Marchini, Chiara, Puglisi, Alessia, Candela, Marco, Mass, Tali, Tassi, F, LaJeunesse, Todd C, Dubinsky, Zvy, Falini, Giuseppe, Goffredo, Stefano
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Balanophyllia europaea; Benthos; Biomass/Abundance/Elemental composition; CO2 vent; Coast and continental shelf; Entire community; Field observation; Mediterranean Sea; Other studied parameter or process; Primary production/Photosynthesis; Rocky-shore community; Temperate; Type; Time point, descriptive; Site; Effective quantum yield; Fluorescence, minimum; Fluorescence, maximum; Symbiont cell density; Chlorophyll a per cell; Chlorophyll a; Category; Nitrogen; δ15N; Carbon; δ13C; Carbon/Nitrogen ratio; pH; Salinity; Temperature, water; Alkalinity, total; Partial pressure of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon dioxide; Carbon, inorganic, dissolved; Calcite saturation state; Aragonite saturation state; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.957190; https://doi.pangaea.de/10.1594/PANGAEA.957190

Ocean acidification caused by shifts in ocean carbonate chemistry resulting from increased atmospheric CO2 concentrations is threatening many calcifying organisms, including corals. Here we assessed autotrophy vs heterotrophy shifts in the Mediterranean zooxanthellate scleractinian coral Balanophyllia europaea acclimatized to low pH/high pCO2 conditions at a CO2 vent off Panarea Island (Italy). Dinoflagellate endosymbiont densities were higher at lowest pH Sites where changes in the distribution of distinct haplotypes of a host-specific symbiont species, Philozoon balanophyllum, were observed. An increase in symbiont C/N ratios was observed at low pH, likely as a result of increased C fixation by higher symbiont cell densities. δ13C values of the symbionts and host tissue reached similar values at the lowest pH Site, suggesting an increased influence of autotrophy with increasing acidification. Host tissue δ15N values of 0‰ strongly suggest that diazotroph N2 fixation is occurring within the coral ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2022) 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 by seacarb is 2023-04-03. ...