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Main Authors: Teira, Eva, Fernández, A, Alvarez-Salgado, Xose Anton, García-Martín, Enma Elena, Serret, Pablo, Sobrino, Cristina
Format: Dataset Open Access
Language:en
Published: PANGAEA 2012
Subjects:
Abundance, standard error; Abundance per volume; Alkalinity, total; Alkalinity, total, standard error; Aragonite saturation state; Bacteria; Bacteria, growth efficiency; Bacteria, growth efficiency, standard error; Bicarbonate ion; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Calcite saturation state; Calculated; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon fixation rate; Carbon fixation rate, standard deviation; Cytophaga sp.; Fluorescence, dissolved organic matter; Fluorescence, dissolved organic matter, standard error; Fluorescence, particulate organic matter; Fluorescence, particulate organic matter, standard error; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Heterotrophic prokaryotes; Laboratory experiment; Laboratory strains; Leucine incorporation rate; Leucine incorporation rate, standard error; Mediterranean Sea; 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, standard error; pH, total scale; Potentiometric; Respiration; Respiration rate, carbon dioxide; Respiration rate, carbon dioxide, standard error; Salinity; Salinity, standard error; Single species; Species; Strain; Temperature, water; Temperature, water, standard error; Treatment
Online Access:https://doi.org/10.1594/PANGAEA.831372
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Table of Contents:
  • Experimental results related to the effects of ocean acidification on planktonic marine microbes are still rather inconsistent and occasionally contradictory. Moreover, laboratory or field experiments that address the effects of changes in CO2 concentrations on heterotrophic microbes are very scarce, despite the major role of these organisms in the marine carbon cycle. We tested the direct effect of an elevated CO2 concentration (1000 ppmv) on the biomass and metabolic rates (leucine incorporation, CO2 fixation and respiration) of 2 isolates belonging to 2 relevant marine bacterial families, Rhodobacteraceae (strain MED165) and Flavobacteriaceae (strain MED217). Our results demonstrate that, contrary to some expectations, high pCO2 did not negatively affect bacterial growth but increased growth efficiency in the case of MED217. The elevated partial pressure of CO2 (pCO2) caused, in both cases, higher rates of CO2 fixation in the dissolved fraction and, in the case of MED217, lower respiration rates. Both responses would tend to increase the pH of seawater acting as a negative feedback between elevated atmospheric CO2 concentrations and ocean acidification.

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