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Main Authors: Samperio-Ramos, Guillermo, Santana-Casiano, Juana Magdalena, González-Dávila, Melchor, Ferreira, Sonia, Coimbra, Manuel A
Format: Dataset Open Access
Language:en
Published: PANGAEA 2017
Subjects:
Alkalinity, total; Alkalinity, total, standard error; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chromista; Dissolved organic carbon extracellular release rate, standard error; Dissolved organic carbon extracellular release rate per cell; Dissolved uronic acids extracellular release rate, standard error; Dissolved uronic acids extracellular release rate per cell; Emiliania huxleyi; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard error; Haptophyta; Laboratory experiment; Laboratory strains; Not applicable; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard error; Pelagos; pH, total scale; Phenolic compounds extracellular release rate, standard error; Phenolic compounds extracellular release rate per cell; Phytoplankton; Registration number of species; Salinity; Single species; Species; Stage; Temperature, water; Total dissolved combined carbohydrates extracellular release rate, standard error; Total dissolved combined carbohydrates extracellular release rate per cell; Type; Uniform resource locator/link to reference
Online Access:https://doi.org/10.1594/PANGAEA.891195
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Table of Contents:
  • The variability in the extracellular release of organic ligands by Emiliania huxleyi under four different pCO2 scenarios (225, 350, 600 and 900 μatm), was determined. Growth in the batch cultures was promoted by enriching them only with major nutrients and low iron concentrations. No chelating agents were added to control metal speciation. During the initial (IP), exponential (EP) and steady (SP) phases, extracellular release rates, normalized per cell and day, of dissolved organic carbon (DOCER), phenolic compounds (PhCER), dissolved combined carbohydrates (DCCHOER) and dissolved uronic acids (DUAER) in the exudates were determined. The growth rate decreased in the highest CO2 treatment during the IP (＜48 h), but later increased when the exposure was longer (more than 6 days). DOCER did not increase significantly with high pCO2. Although no relationship was observed between DCCHOER and the CO2 conditions, DCCHO was a substantial fraction of the freshly released organic material, accounting for 18% to 37%, in EP, and 14% to 23%, in SP, of the DOC produced. Growth of E. huxleyi induced a strong response in the PhCER and DUAER. While in EP, PhCER were no detected, the DUAER remained almost constant for all CO2 treatments. Increases in the extracellular release of these organic ligands during SP were most pronounced under high pCO2 conditions. Our results imply that, during the final growth stage of E. huxleyi, elevated CO2 conditions will increase its excretion of acid polysaccharides and phenolic compounds, which may affect the biogeochemical behavior of metals in seawater.

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