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Ragazzola, Federica; Foster, Laura C; Jones, C J; Scott, T B; Fietzke, Jan; Kilburn, M R; Schmidt, Daniela N (2016): Impact of high CO2 on the geochemistry of the coralline algae Lithothamnion glaciale. PANGAEA, https://doi.org/10.1594/PANGAEA.867382, Supplement to: Ragazzola, F et al. (2016): Impact of high CO2 on the geochemistry of the coralline algae Lithothamnion glaciale. Scientific Reports, 6, 20572, https://doi.org/10.1038/srep20572

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Abstract:
Coralline algae are a significant component of the benthic ecosystem. Their ability to withstand physical stresses in high energy environments relies on their skeletal structure which is composed of high Mg-calcite. High Mg-calcite is, however, the most soluble form of calcium carbonate and therefore potentially vulnerable to the change in carbonate chemistry resulting from the absorption of anthropogenic CO2 by the ocean. We examine the geochemistry of the cold water coralline alga Lithothamnion glaciale grown under predicted future (year 2050) high pCO2 (589 matm) using Electron microprobe and NanoSIMS analysis. In the natural and control material, higher Mg calcite forms clear concentric bands around the algal cells. As expected, summer growth has a higher Mg content compared to the winter growth. In contrast, under elevated CO2 no banding of Mg is recognisable and overall Mg concentrations are lower. This reduction in Mg in the carbonate undermines the accuracy of the Mg/Ca ratio as proxy for past temperatures in time intervals with significantly different carbonate chemistry. Fundamentally, the loss of Mg in the calcite may reduce elasticity thereby changing the structural properties, which may affect the ability of L. glaciale to efficiently function as a habitat former in the future ocean.
Keyword(s):
Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria ( 20 L); Coast and continental shelf; Laboratory experiment; Lithothamnion glaciale; Macroalgae; North Atlantic; Plantae; Rhodophyta; Single species; Temperate
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.8. https://cran.r-project.org/package=seacarb
Coverage:
Latitude: 57.010160 * Longitude: 11.583160
Date/Time Start: 2010-06-01T00:00:00 * Date/Time End: 2010-06-30T00:00:00
Minimum Elevation: -20.0 m * Maximum Elevation: -20.0 m
Event(s):
Kattegat_OA * Latitude: 57.010160 * Longitude: 11.583160 * Date/Time Start: 2010-06-01T00:00:00 * Date/Time End: 2010-06-30T00:00:00 * Elevation: -20.0 m * Device: Experiment (EXP)
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 is 2016-10-31.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TypeTypeRagazzola, Federicastudy
2SpeciesSpeciesRagazzola, Federica
3Registration number of speciesReg spec noRagazzola, Federica
4Uniform resource locator/link to referenceURL refRagazzola, FedericaWoRMS Aphia ID
5Sample IDSample IDRagazzola, Federica
6LocationLocationRagazzola, Federicaregions-of-interest
7Magnesium/Calcium ratioMg/CaRagazzola, Federica
8Magnesium/Calcium ratio, standard errorMg/Ca std e±Ragazzola, Federica2SE
9Strontium/Calcium ratioSr/CaRagazzola, Federica
10Strontium/Calcium ratio, standard errorSr/Ca std e±Ragazzola, Federica2SE
11pHpHRagazzola, Federicafree scale
12pH, standard deviationpH std dev±Ragazzola, Federicafree scale
13SalinitySalRagazzola, Federica
14Salinity, standard deviationSal std dev±Ragazzola, Federica
15Temperature, waterTemp°CRagazzola, Federica
16Temperature, water, standard deviationTemp std dev±Ragazzola, Federica
17Alkalinity, totalATµmol/kgRagazzola, FedericaPotentiometric titration
18Alkalinity, total, standard deviationAT std dev±Ragazzola, FedericaPotentiometric titration
19Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
21Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
22Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
23Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
24Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
26Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
27Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
28Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
600 data points

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