Seawater carbonate chemistry, growth rate and processes during experiments with Coccolithus pelagicus and Calcidiscus leptoporus, 2006 ...

• Main Authors: Langer, Gerald, Geisen, Markus, Baumann, Karl-Heinz, Kläs, Jessica, Riebesell, Ulf, Thoms, Silke, Young, Jeremy
• Format: Dataset
• Language: English
• Published: PANGAEA 2006
• Subjects: Bottles or small containers/Aquaria <20 L; Calcidiscus leptoporus; Calcification/Dissolution; Chromista; Coccolithus pelagicus; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species; South Atlantic; Species; Experimental treatment; Temperature, water; Radiation, photosynthetically active; LightDark cycle; pH; Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide; Bicarbonate ion; Carbonate ion; Partial pressure of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Carbon, organic, particulate, per cell; Carbon, inorganic, particulate, per cell; Carbon organic/inorganic ratio; Growth rate; Coccoliths, sphere size; Coccoliths; Experiment; Calculated using CO2SYS; Titration potentiometric; Element analyser CNS, Carlo Erba NA1500; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.721107; https://doi.pangaea.de/10.1594/PANGAEA.721107

Uptake of half of the fossil fuel CO2 into the ocean causes gradual seawater acidification. This has been shown to slow down calcification of major calcifying groups, such as corals, foraminifera, and coccolithophores. Here we show that two of the most productive marine calcifying species, the coccolithophores Coccolithus pelagicus and Calcidiscus leptoporus, do not follow the CO2-related calcification response previously found. In batch culture experiments, particulate inorganic carbon (PIC) of C. leptoporus changes with increasing CO2 concentration in a nonlinear relationship. A PIC optimum curve is obtained, with a maximum value at present-day surface ocean pCO2 levels (?360 ppm CO2). With particulate organic carbon (POC) remaining constant over the range of CO2 concentrations, the PIC/POC ratio also shows an optimum curve. In the C. pelagicus cultures, neither PIC nor POC changes significantly over the CO2 range tested, yielding a stable PIC/POC ratio. Since growth rate in both species did not change ... : Supplement to: Langer, Gerald; Geisen, Markus; Baumann, Karl-Heinz; Kläs, Jessica; Riebesell, Ulf; Thoms, Silke; Young, Jeremy (2006): Species-specific responses of calcifying algae to changing seawater carbonate chemistry. Geochemistry, Geophysics, Geosystems, 7, Q09006 ...