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Thomsen, Jörn; Melzner, Frank (2010): Seawater carbonate chemistry and biological processes of Mytilus edulis during experiments, 2010. doi:10.1594/PANGAEA.756663,
Supplement to: Thomsen, J; Melzner, F (2010): Moderate seawater acidification does not elicit long-term metabolic depression in the blue mussel Mytilus edulis. Marine Biology, 157(2), 2667-2676, doi:10.1007/s00227-010-1527-0

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Abstract:
Marine organisms are exposed to increasingly acidic oceans, as a result of equilibration of surface ocean water with rising atmospheric CO2 concentrations. In this study, we examined the physiological response of Mytilus edulis from the Baltic Sea, grown for 2 months at 4 seawater pCO2 levels (39, 113, 243 and 405 Pa/385, 1,120, 2,400 and 4,000 µatm). Shell and somatic growth, calcification, oxygen consumption and excretion rates were measured in order to test the hypothesis whether exposure to elevated seawater pCO2 is causally related to metabolic depression. During the experimental period, mussel shell mass and shell-free dry mass (SFDM) increased at least by a factor of two and three, respectively. However, shell length and shell mass growth decreased linearly with increasing pCO2 by 6-20 and 10-34%, while SFDM growth was not significantly affected by hypercapnia. We observed a parabolic change in routine metabolic rates with increasing pCO2 and the highest rates (+60%) at 243 Pa. excretion rose linearly with increasing pCO2. Decreased O:N ratios at the highest seawater pCO2 indicate enhanced protein metabolism which may contribute to intracellular pH regulation. We suggest that reduced shell growth under severe acidification is not caused by (global) metabolic depression but is potentially due to synergistic effects of increased cellular energy demand and nitrogen loss.
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Experimental treatmentExp trtmThomsen, Jörn
2IdentificationIDThomsen, Jörn
3SalinitySalThomsen, JörnWTW 315i salinometer and WTW TETRACON 325 probe
4Salinity, standard deviationSal std dev±Thomsen, Jörn
5Temperature, waterTemp°CThomsen, JörnWTW 315i salinometer and WTW TETRACON 325 probe
6Temperature, standard deviationT std dev±Thomsen, Jörn
7pHpHThomsen, JörnWTW 315i salinometer and WTW TETRACON 325 probeNBS scale
8pH, standard deviationpH std dev±Thomsen, Jörn
9Alkalinity, totalATµmol/kgThomsen, JörnTitration, VINDTA system
10Alkalinity, total, standard deviationAT std dev±Thomsen, Jörn
11Carbon, inorganic, dissolvedDICµmol/kgThomsen, JörnSOMMA autoanalyzer
12Carbon, inorganic, dissolved, standard deviationDIC std dev±Thomsen, Jörn
13Aragonite saturation stateOmega ArgThomsen, JörnCalculated using CO2SYS
14Aragonite saturation state, standard deviationOmega Arg std dev±Thomsen, Jörn
15Calcite saturation stateOmega CalThomsen, JörnCalculated using CO2SYS
16Calcite saturation state, standard deviationOmega Cal std dev±Thomsen, Jörn
17Respiration rate, oxygenResp O2µmol/mg/hThomsen, JörnIntermittent-flow system
18Ammonium, excretion[NH4]+ excµmol/g/hThomsen, JörnCalculated, see reference(s)during respiration trial
19Nitrogen/Oxygen ratioN/OThomsen, JörnCalculated, see reference(s)
20Ammonium, excretion[NH4]+ excµmol/g/hThomsen, JörnCalculated, see reference(s)during incubation
21Mytilus edulis, weight, dryM. edulis DWmgThomsen, JörnMeasured
22Mytilus edulis, length shellM. edulis L shellmmThomsen, JörnMeasured
23Mytilus edulis, weight, shellM. edulis W shellmgThomsen, JörnMeasured
24Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
25pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
26Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
27Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
28Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
29Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
30Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
31Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
32Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
498 data points

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