Temperature modulates coccolithophorid sensitivity of growth, photosynthesis and calcification to increasing seawater pCO2 ...

• Main Authors: Sett, Scarlett, Bach, Lennart Thomas, Schulz, Kai Georg, Koch-Klavsen, Signe, Lebrato, Mario, Riebesell, Ulf
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Bottles or small containers/Aquaria <20 L; Calcification/Dissolution; Chromista; Emiliania huxleyi; Gephyrocapsa oceanica; Growth/Morphology; Haptophyta; Laboratory experiment; Laboratory strains; North Atlantic; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species; Temperature; Species; Temperature, water; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Alkalinity, total; Carbon, inorganic, dissolved; pH; Calcite saturation state; Growth rate; Particulate organic carbon production per cell; Particulate inorganic carbon production per cell; Particulate inorganic carbon/particulate organic carbon ratio; Salinity; Carbonate system computation flag; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calculated using CO2SYS; Potentiometric titration; Calculated; 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.835214; https://doi.pangaea.de/10.1594/PANGAEA.835214

Increasing atmospheric CO2 concentrations are expected to impact pelagic ecosystem functioning in the near future by driving ocean warming and acidification. While numerous studies have investigated impacts of rising temperature and seawater acidification on planktonic organisms separately, little is presently known on their combined effects. To test for possible synergistic effects we exposed two coccolithophore species, Emiliania huxleyi and Gephyrocapsa oceanica, to a CO2 gradient ranging from ~0.5-250 µmol/kg (i.e. ~20-6000 µatm pCO2) at three different temperatures (i.e. 10, 15, 20°C for E. huxleyi and 15, 20, 25°C for G. oceanica). Both species showed CO2-dependent optimum-curve responses for growth, photosynthesis and calcification rates at all temperatures. Increased temperature generally enhanced growth and production rates and modified sensitivities of metabolic processes to increasing CO2. CO2 optimum concentrations for growth, calcification, and organic carbon fixation rates were only marginally ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 is 2014-08-26. ...