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Thomsen, Jörn; Casties, Isabel; Pansch, Christian; Körtzinger, Arne; Melzner, Frank (2013): Experiment: Food availability outweighs ocean acidification effects in juvenile Mytilus edulis. PANGAEA,, Supplement to: Thomsen, J et al. (2013): Food availability outweighs ocean acidification effects in juvenile Mytilus edulis: laboratory and field experiments. Global Change Biology, 19(4), 1017-1027,

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Ocean acidification is expected to decrease calcification rates of bivalves. Nevertheless in many coastal areas high pCO2 variability is encountered already today. Kiel Fjord (Western Baltic Sea) is a brackish (12-20 g kg-1) and CO2 enriched habitat, but the blue mussel Mytilus edulis dominates the benthic community. In a coupled field and laboratory study we examined the annual pCO2 variability in this habitat and the combined effects of elevated pCO2 and food availability on juvenile M. edulis growth and calcification. In the laboratory experiment, mussel growth and calcification were found to chiefly depend on food supply, with only minor impacts of pCO2 up to 3350 µatm. Kiel Fjord was characterized by strong seasonal pCO2 variability. During summer, maximal pCO2 values of 2500 µatm were observed at the surface and >3000 µatm at the bottom. However, the field growth experiment revealed seven times higher growth and calcification rates of M. edulis at a high pCO2 inner fjord field station (mean pCO2 ca. 1000 µatm) in comparison to a low pCO2 outer fjord station (ca. 600 µatm). In addition, mussels were able to outcompete the barnacle Amphibalanus improvisus at the high pCO2 site. High mussel productivity at the inner fjord site was enabled by higher particulate organic carbon concentrations. Kiel Fjord is highly impacted by eutrophication, which causes bottom water hypoxia and consequently high seawater pCO2. At the same time, elevated nutrient concentrations increase the energy availability for filter feeding organisms such as mussels. Thus M. edulis can dominate over a seemingly more acidification resistant species such as A. improvisus. We conclude that benthic stages of M. edulis tolerate high ambient pCO2 when food supply is abundant and that important habitat characteristics such as species interactions and energy availability need to be considered to predict species vulnerability to ocean acidification.
Acid-base regulation; Animalia; Baltic Sea; Benthic animals; Benthos; Bottles or small containers/Aquaria (<20 L); Calcification/Dissolution; Charophyta; Coast and continental shelf; Field experiment; Growth/Morphology; Laboratory experiment; Mollusca; Mytilus edulis; Other; Single species; Temperate
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4.
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). The date of carbonate chemistry calculation by seacarb is 2014-2-13.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1IdentificationIDThomsen, Jörn
2SpeciesSpeciesThomsen, Jörn
3TreatmentTreatThomsen, Jörn
4ExperimentExpThomsen, Jörn
5LengthlµmThomsen, JörnShell length
6Length, standard deviationl std dev±Thomsen, JörnShell length std dev
7Calcium carbonate, dry weightCaCO3 DWmgThomsen, JörnCaCO3 mass growth
8Calcium carbonate, dry weight, standard deviationCaCO3 DW std dev±Thomsen, JörnCaCO3 mass growth std dev
9MassMassmgThomsen, Jörntotal organic mass growth
10Mass, standard deviationMass std dev±Thomsen, Jörntotal organic mass growth std dev
11Station labelStationThomsen, Jörn
12LocationLocationThomsen, Jörn
13DateDateThomsen, Jörn
14Carbon dioxide, partial pressurepCO2µatmThomsen, Jörn
15Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Thomsen, Jörn
16pHpHThomsen, JörnNBS scale
17MassMassmgThomsen, Jörnmussel CaCO3 per panel
18Mass, standard deviationMass std dev±Thomsen, Jörnmussel CaCO3 per panel std dev
19Shell lengthShell lmmThomsen, Jörn
20MassMassmgThomsen, JörnShell mass
21Carbon, organic, particulatePOCµg/lThomsen, Jörn
22Carbon, organic, particulate, standard deviationPOC std dev±Thomsen, Jörn
23Nitrogen, organic, particulatePONµg/lThomsen, Jörn
24Nitrogen, organic, particulate, standard deviationPON std dev±Thomsen, Jörn
25MassMassmgThomsen, Jörndry mass
26Mass, standard deviationMass std dev±Thomsen, Jörndry mass std dev
27CoverageCov%Thomsen, Jörnmussel coverage
28Coverage, standard deviationCov std dev±Thomsen, Jörnmussel coverage std dev
29CoverageCov%Thomsen, Jörnbarncale coverage
30Coverage, standard deviationCov std dev±Thomsen, Jörnbarncale coverage std dev
31SurvivalSurvival%Thomsen, Jörnbarnacle surviva
32Survival rate, standard deviationSurvival rate std dev±Thomsen, Jörnbarnacle surviva std dev
33Calcium carbonate, massCaCO3gThomsen, Jörnbarnacle CaCO3 (g/plate)
34Calcium carbonate, standard deviationCaCO3 std dev±Thomsen, Jörnbarnacle CaCO3 std dev
35Haemolymph, pHpH (ha)Thomsen, Jörn
36Haemolymph, pH, standard deviationpH (ha) std dev±Thomsen, Jörn
37SalinitySalThomsen, Jörn
38Salinity, standard deviationSal std dev±Thomsen, Jörn
39Temperature, waterTemp°CThomsen, Jörn
40Temperature, standard deviationT std dev±Thomsen, Jörn
41Carbon, inorganic, dissolvedDICµmol/kgThomsen, Jörn
42Carbon, inorganic, dissolved, standard deviationDIC std dev±Thomsen, Jörn
43pHpHThomsen, Jörntotal scale
44pH, standard deviationpH std dev±Thomsen, Jörntotal scale
45Alkalinity, totalATµmol/kgThomsen, Jörn
46Alkalinity, total, standard deviationAT std dev±Thomsen, Jörn
47Calcite saturation stateOmega CalThomsen, Jörn
48Calcite saturation state, standard deviationOmega Cal std dev±Thomsen, Jörn
49Aragonite saturation stateOmega ArgThomsen, Jörn
50Aragonite saturation state, standard deviationOmega Arg std dev±Thomsen, Jörn
51Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
52pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
53Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
54Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
55Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
56Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
57Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
58Alkalinity, totalATµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
59Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
60Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
7211 data points

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