Response of two marine bacterial isolates to high CO2 concentration

Teira, Eva, Fernández, Ana, Álvarez-Salgado, Xosé Antón, García-Martín, Enma Elena, Serret, Pablo and Sobrino, Cristina (2012) Response of two marine bacterial isolates to high CO2 concentration. Marine Ecology Progress Series, 453. pp. 27-36. ISSN 0171-8630

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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 CO 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 CO concentration (1000 ppmv) on the biomass and metabolic rates (leucine incorporation, CO 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 pCO did not negatively affect bacterial growth but increased growth efficiency in the case of MED217. The elevated partial pressure of CO (pCO) caused, in both cases, higher rates of CO 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 CO concentrations and ocean acidification.

Item Type: Article
Uncontrolled Keywords: sdg 14 - life below water ,/dk/atira/pure/sustainabledevelopmentgoals/life_below_water
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 09 Jun 2014 21:14
Last Modified: 24 Oct 2022 06:12
DOI: 10.3354/meps09644

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