Seawater carbonate chemistry and Globigerinoides sacculifer biological processes during experiments, 2010

• Main Authors: Lombard, F, da Rocha, R E, Bijma, Jelle, Gattuso, Jean-Pierre
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: Alkalinity; Gran titration (Gran; 1950); total; standard deviation; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Coast and continental shelf; Counting; Date; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; Experimental treatment; Experiment day; Foraminifera; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Globigerinoides sacculifer; size average; weight; Growth/Morphology; Heterotrophic prokaryotes; Laboratory experiment; Light; Measured; North Atlantic; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Orbulina universa; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Pacific; Ocean acidification; Planktonic foraminifera
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.744887; https://doi.org/10.1594/PANGAEA.744887

The effect of carbonate ion concentration ([CO3]) on calcification rates estimated from shell size and weight was investigated in the planktonic foraminifera Orbulina universa and Globigerinoides sacculifer. Experiments on G. sacculifer were conducted under two irradiance levels (35 and 335 µmol photons m-2 s-1). Calcification was ca. 30% lower under low light than under high light, irrespective of the [CO3]. Both O. universa and G. sacculifer exhibited reduced final shell weight and calcification rate under low [CO3]. For the [CO3] expected at the end of the century, the calcification rates of these two species are projected to be 6 to 13% lower than the present conditions, while the final shell weights are reduced by 20 to 27% for O. universa and by 4 to 6% for G. sacculifer. These results indicate that ocean acidification would impact on calcite production by foraminifera and may decrease the calcite flux contribution from these organisms.