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Response of two marine bacterial isolates to high CO2 concentration

AuthorsTeira, Eva; Fernández, Ana; Álvarez-Salgado, Xosé Antón ; García-Martín, Enma Elena; Serret, Pablo; Sobrino, Cristina
KeywordsBacterial metabolism
Ocean acidification
Issue Date2012
PublisherInter Research
CitationMarine Ecology Progress Series 453: 27-36 (2012)
AbstractExperimental 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.
Description10 páginas, 3 figuras
Publisher version (URL)http://dx.doi.org/10.3354/meps09644
Appears in Collections:(IIM) Artículos
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