Seawater carbonate chemistry, Acropora digitifera growth and skeletal U/Ca ratios during experiments, 2011 ...

• Main Authors: Inoue, Mayuri, Suwa, Ryota, Suzuki, Atsushi, Sakai, Kazuhiko, Kawahata, Hodaka
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Acropora digitifera; Animalia; Benthic animals; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Calcification/Dissolution; Cnidaria; Coast and continental shelf; Growth/Morphology; Laboratory experiment; North Pacific; Single species; Temperate; Experimental treatment; Salinity; Salinity, standard deviation; Temperature, water; Temperature, standard deviation; pH; pH, standard deviation; Alkalinity, total; Carbonate ion; Partial pressure of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcification rate; Acropora digitifera, weight; Acropora digitifera, weight, standard deviation; Replicates; Uranium/Calcium ratio; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbon, inorganic, dissolved; Calcite saturation state; pH meter Metrohm electrodes; Measured; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.773863; https://doi.pangaea.de/10.1594/PANGAEA.773863

The impact of ocean acidification caused by the increasing atmospheric CO2 has been studied in marine calcifiers, including hermatypic corals. However, the effect of elevated pCO2 on the early developmental life-cycle stage of corals has been little studied. In this study, we reared polyps of Acropora digitifera in seawater at pHT 6.55, 7.31, 7.64, 7.77, and 8.03, controlled by CO2 bubbling. We measured the dry weights of polyp skeletons after the 40-d experiment to investigate the relationship between the seawater aragonite saturation state and polyp growth. In addition, we measured skeletal U/Ca ratio to estimate their pH dependence. Skeletal weights of coral polyps increased with the aragonite saturation state and reached an apparent saturation plateau above pH 7.77. U/Ca ratios had a strong inverse relationship with pH and a negligible relationship with skeletal growth rate (polyp weight), suggesting that skeletal U/Ca could be useful for reconstructing paleo-pH. ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) 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). ...