Seawater carbonate chemistry and calcification rate during experiments with coral Stylophora pistillata, 2003

• Main Authors: Reynaud, Stéphanie, Leclercq, Nicolas, Romaine-Lioud, Samantha, Ferrier-Pagès, Christine, Jaubert, Jean, Gattuso, Jean-Pierre
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2003
• Subjects: Animalia; Benthic animals; Benthos; Calcification/Dissolution; Cnidaria; Containers and aquaria 20-1000 L or < 1 m**2; Laboratory experiment; Laboratory strains; Single species; Stylophora pistillata; Temperature; Identification; DATE/TIME; Calcification rate; Carbonate system computation flag; Salinity; Temperature, water; pH; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Alkalinity, total; Aragonite saturation state; Calcite saturation state; Estimated by regressing O2 against time; Calculated using seacarb after Nisumaa et al. 2010; PAR sensor LI-1000, LI-COR Inc.; Estimated; Measured; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.779698; https://doi.pangaea.de/10.1594/PANGAEA.779698

We show here that CO2 partial pressure (pCO2) and temperature significantly interact on coral physiology. The effects of increased pCO2 and temperature on photosynthesis, respiration and calcification rates were investigated in the scleractinian coral Stylophora pistillata. Cuttings were exposed to temperatures of 25°C or 28°C and to pCO2 values of ca. 460 or 760 muatm for 5 weeks. The contents of chlorophyll c2 and protein remained constant throughout the experiment, while the chlorophyll a content was significantly affected by temperature, and was higher under the 'high-temperature-high-pCO2' condition. The cell-specific density was higher at 'high pCO2' than at 'normal pCO2' (1.7 vs. 1.4). The net photosynthesis normalized per unit protein was affected by both temperature and pCO2, whereas respiration was not affected by the treatments. Calcification decreased by 50% when temperature and pCO2 were both elevated. Calcification under normal temperature did not change in response to an increased pCO2. This is not in agreement with numerous published papers that describe a negative relationship between marine calcification and CO2. The confounding effect of temperature has the potential to explain a large portion of the variability of the relationship between calcification and pCO2 reported in the literature, and warrants a re-evaluation of the projected decrease of marine calcification by the year 2100. : 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).