Data Description

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Citation:
Thomsen, J; Melzner, F (2010): Seawater carbonate chemistry and biological processes of Mytilus edulis during experiments, 2010. doi:10.1594/PANGAEA.756663,
Supplement to: Thomsen, Jörn; Melzner, Frank (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
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.
Project(s):
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 treatment *Exp trtmThomsen, Jörn *
2Identification *IDThomsen, Jörn *
3Salinity *SalThomsen, Jörn *WTW 315i salinometer and WTW TETRACON 325 probe *
4Salinity, standard deviation *Sal std dev±Thomsen, Jörn *
5Temperature, water *Temp°CThomsen, Jörn *WTW 315i salinometer and WTW TETRACON 325 probe *
6Temperature, standard deviation *T std dev±Thomsen, Jörn *
7pH *pHThomsen, Jörn *WTW 315i salinometer and WTW TETRACON 325 probe *NBS scale
8pH, standard deviation *pH std dev±Thomsen, Jörn *
9Alkalinity, total *ATµmol/kgThomsen, Jörn *Titration, VINDTA system *
10Alkalinity, total, standard deviation *AT std dev±Thomsen, Jörn *
11Carbon, inorganic, dissolved *DICµmol/kgThomsen, Jörn *SOMMA autoanalyzer *
12Carbon, inorganic, dissolved, standard deviation *DIC std dev±Thomsen, Jörn *
13Aragonite saturation state *Omega ArgThomsen, Jörn *Calculated using CO2SYS *
14Aragonite saturation state, standard deviation *Omega Arg std dev±Thomsen, Jörn *
15Calcite saturation state *Omega CalThomsen, Jörn *Calculated using CO2SYS *
16Calcite saturation state, standard deviation *Omega Cal std dev±Thomsen, Jörn *
17Respiration rate, oxygen *Resp O2µmol/mg/hThomsen, Jörn *Intermittent-flow system *
18Ammonium, excretion *[NH4]+ excµmol/g/hThomsen, Jörn *Calculated, see reference(s) *during respiration trial
19Nitrogen/Oxygen ratio *N/OThomsen, Jörn *Calculated, see reference(s) *
20Ammonium, excretion *[NH4]+ excµmol/g/hThomsen, Jörn *Calculated, see reference(s) *during incubation
21Mytilus edulis, weight, dry *M. edulis DWmgThomsen, Jörn *Measured *
22Mytilus edulis, length shell *M. edulis L shellmmThomsen, Jörn *Measured *
23Mytilus edulis, weight, shell *M. edulis W shellmgThomsen, Jörn *Measured *
24Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
25pH *pHNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *Total scale
26Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
27Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
28Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
29Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
30Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
31Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
32Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
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498 data points

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