Articles | Volume 14, issue 16
Biogeosciences, 14, 3831–3849, 2017
https://doi.org/10.5194/bg-14-3831-2017

Special issue: Effects of rising CO2 on a Baltic Sea plankton...

Biogeosciences, 14, 3831–3849, 2017
https://doi.org/10.5194/bg-14-3831-2017
Research article
29 Aug 2017
Research article | 29 Aug 2017

Alterations in microbial community composition with increasing fCO2: a mesocosm study in the eastern Baltic Sea

Katharine J. Crawfurd et al.

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Aberle, N., Schulz, K. G., Stuhr, A., Malzahn, A. M., Ludwig, A., and Riebesell, U.: High tolerance of microzooplankton to ocean acidification in an Arctic coastal plankton community, Biogeosciences, 10, 1471–1481, https://doi.org/10.5194/bg-10-1471-2013, 2013.
Barcelos e Ramos, J., Biswas, H., Schulz, K. G., LaRoche, J., and Riebesell, U.: Effect of rising atmospheric carbon dioxide on the marine nitrogen fixer Trichodesmium, Global Biogeochem. Cy., 21, GB2028, https://doi.org/10.1029/2006GB002898, 2007.
Baudoux, A. C., Noordeloos, A. A. M., Veldhuis, M. J. W., and Brussaard, C. P. D.: Virally induced mortality of Phaeocystis globosa during two spring blooms in temperate coastal waters, Aquat. Microb. Ecol., 44, 207–217, https://doi.org/10.3354/ame044207, 2006.
Bermúdez, R., Winder, M., Stuhr, A., Almén, A.-K., Engström-Öst, J., and Riebesell, U.: Effect of ocean acidification on the structure and fatty acid composition of a natural plankton community in the Baltic Sea, Biogeosciences, 13, 6625–6635, https://doi.org/10.5194/bg-13-6625-2016, 2016.
Brussaard, C. P. D.: Optimization of Procedures for Counting Viruses by Flow Cytometry, Appl. Environ. Microb., 70, 1506–1513, https://doi.org/10.1128/AEM.70.3.1506-1513.2004, 2004.
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Short summary
Carbon dioxide (CO2) is increasing in the atmosphere and oceans. To simulate future conditions we manipulated CO2 concentrations of natural Baltic seawater in 55 m3 bags in situ. We saw increased growth rates and abundances of the smallest-sized eukaryotic phytoplankton and reduced abundances of other phytoplankton with increased CO2. Viral and bacterial abundances were also affected. This would lead to more carbon recycling in the surface water and affect marine food webs and the carbon cycle.
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