Seawater carbonate chemistry and net photosynthesis, C/N ratio, growth rate, size of Ostreococcus tauri in a laboratory experiment, supplement to: Schaum, Elisa; Rost, Bjoern; Millar, Andrew J; Collins, Sinéad (2012): Variation in plastic responses of a globally distributed picoplankton species to ocean acidification. Nature Climate Change, 3(3), 298-302

• Main Authors: Schaum, Elisa, Rost, Bjoern, Millar, Andrew J, Collins, Sinéad
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2013
• Subjects: Bottles or small containers/Aquaria <20 L; Chlorophyta; Growth/Morphology; Laboratory experiment; Laboratory strains; North Atlantic; Ostreococcus tauri; Pelagos; Phytoplankton; Plantae; Primary production/Photosynthesis; Respiration; Single species; Species; Identification; Treatment; Ecotype; Growth rate; Growth rate, standard error; Net photosynthesis rate, oxygen, per cell; Net photosynthesis rate, oxygen, standard error; Cell size; Cell size, standard error; Carbon, organic, particulate, per cell; Particulate organic nitrogen per cell; Carbon, organic, particulate/Nitrogen, organic, particulate ratio; Respiration rate, oxygen, per cell; Respiration rate, oxygen, standard error; Chlorophyll a per cell; Salinity; Temperature, water; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; pH; pH, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcite saturation state; Potentiometric titration; Calculated using CO2SYS; 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.823378; https://doi.pangaea.de/10.1594/PANGAEA.823378

Phytoplankton are the basis of marine food webs, and affect biogeochemical cycles. As CO2 levels increase, shifts in the frequencies and physiology of ecotypes within phytoplankton groups will affect their nutritional value and biogeochemical function. However, studies so far are based on a few representative genotypes from key species. Here, we measure changes in cellular function and growth rate at atmospheric CO2 concentrations predicted for the year 2100 in 16 ecotypes of the marine picoplankton Ostreococcus. We find that variation in plastic responses among ecotypes is on par with published between-genera variation, so the responses of one or a few ecotypes cannot estimate changes to the physiology or composition of a species under CO2 enrichment. We show that ecotypes best at taking advantage of CO2 enrichment by changing their photosynthesis rates most should increase in relative fitness, and so in frequency in a high-CO2 environment. Finally, information on sampling location, and not phylogenetic relatedness, is a good predictor of ecotypes likely to increase in frequency in this system. : 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). The date of carbonate chemistry calculation by seacarb is 2013-11-28.