Biogeosciences
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2008
10.5194/bg-5-407-2008
http://www.biogeosciences.net/5/407/2008/
http://www.biogeosciences.net/5/407/2008/bg-5-407-2008.html
http://www.biogeosciences.net/5/407/2008/bg-5-407-2008.pdf
407
419
2008-03-18
Dynamics of dimethylsulphoniopropionate and dimethylsulphide under different CO<sub>2</sub> concentrations during a mesocosm experiment
M. Vogt
m.vogt@uea.ac.uk
M. Steinke
S. Turner
A. Paulino
M. Meyerhöfer
U. Riebesell
C. LeQuéré
P. Liss
Max-Planck-Institut für Biogeochemie, Postfach 100164, 07701 Jena, Germany
Lab. for Global Marine and Atmospheric Chemistry, School of Environ. Sci., Univ. of East Anglia, Norwich NR4 7TJ, UK
Department of Biology, University of Bergen, Box 7800, 5020 Bergen, Norway
British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
IFM-GEOMAR, Dienstgebäude Westufer, Düsternbrooker Weg 20, 24120 Kiel, Germany
now at: Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, CO4 3SQ, UK
The potential impact of seawater acidification on the
concentrations of dimethylsulfide (DMS) and dimethylsulfoniopropionate
(DMSP), and the activity of the enzyme DMSP-lyase was investigated during a pelagic ecosystem
CO<sub>2</sub> enrichment experiment (PeECE III) in spring 2005. Natural
phytoplankton blooms were studied for 24 days under present, double and
triple partial pressures of CO<sub>2</sub> (pCO<sub>2</sub>; pH=8.3, 8.0, 7.8) in
triplicate 25 m<sup>3</sup> enclosures. The results indicate similar DMSP
concentrations and DMSP-lyase activity (DLA) patterns for all treatments. Hence,
DMSP and DLA do not seem to have been affected by the CO<sub>2</sub> treatment. In
contrast, DMS concentrations showed small but statistically significant
differences in the temporal development of the low versus the high
CO<sub>2</sub> treatments. The low pCO<sub>2</sub> enclosures had higher DMS concentrations
during the first 10 days, after which the levels decreased earlier and more
rapidly than in the other treatments. Integrated over the whole study
period, DMS concentrations were not significantly different from those of
the double and triple pCO<sub>2</sub> treatments. Pigment and flow-cytometric data
indicate that phytoplanktonic populations were generally similar between the
treatments, suggesting a certain resilience of the marine ecosystem under
study to the induced pH changes, which is reflected in DMSP and DLA.
However, there were significant differences in bacterial community structure
and the abundance of one group of viruses infecting nanoeukaryotic algae.
The amount of DMS accumulated per
total DMSP or chlorophyll-<i>a</i> differed significantly between the present and
future scenarios, suggesting that the pathways for DMS production or
bacterial DMS consumption were affected by seawater pH. A comparison with
previous work (PeECE II) suggests that DMS concentrations do not respond
consistently to pelagic ecosystem CO<sub>2</sub> enrichment experiments.
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