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Comeau, Steeve; Gattuso, Jean-Pierre; Jeffree, Ross; Gazeau, Frédéric (2010): Seawater carbonate chemistry, calcification and respiration duirng experiments with a pteropod Creseis acicula, 2010. Laboratoire d'Océanographie de Villefranche, PANGAEA, https://doi.org/10.1594/PANGAEA.754858

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Abstract:
Among marine calcifiers, shelled pteropods are expected to be particularly sensitive to ocean acidification, generated by the uptake of anthropogenic CO2 by the ocean, and the associated decrease of the seawater saturation state with respect to aragonite (omega aragonite). The few available studies have mostly focused on polar species although pteropods are also important components of temperate and tropical ecosystems. It is also unknown which parameter of the carbonate system controls calcification. Specimens of the temperate Mediterranean species Creseis acicula were maintained under seven different conditions of the carbonate chemistry, obtained by manipulating pH and total alkalinity, with the goal to disentangle the effects of pH and omega aragonite. Respiration, excretion as well as rates of net and gross calcification were not directly affected by a decrease in pH but decreased significantly with a decrease of omega aragonite. The decrease of gross calcification rates is consistent with that reported for polar species. Although the organisms were apparently able to maintain gross calcification rates under slightly undersaturated aragonite conditions, the clear net dissolution signal observed below saturation suggests that they are not able to build a shell in seawater corrosive to aragonite. The decrease in respiration and excretion, and the low O:N molar ratio, could be due to the short time that the organisms were allowed to acclimatize to their new environment.
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 treatComeau, Steeve
2IdentificationIDComeau, Steeve
3SalinitySalComeau, Steeve
4Temperature, waterTemp°CComeau, Steeve
5Temperature, standard deviationT std dev±Comeau, Steeve
6Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
7pHpHComeau, SteevepH meter (Metrohm, 826 pH mobile)Total scale
8pH, standard deviationpH std dev±Comeau, Steeve
9Alkalinity, totalATµmol/kgComeau, SteeveMetrohm Titrando titrator
10Alkalinity, total, standard deviationAT std dev±Comeau, Steeve
11Carbon, inorganic, dissolvedDICµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
12Carbon, inorganic, dissolved, standard deviationDIC std dev±Comeau, Steeve
13Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14Carbon dioxide, partial pressure, standard deviationpCO2 std dev±Comeau, Steeve
15Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Fugacity of carbon dioxide in seawater, standard deviationfCO2 std dev±Comeau, Steeve
17Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Carbon dioxide, standard deviationCO2 std dev±Comeau, Steeve
19Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Bicarbonate ion, standard deviation[HCO3]- std dev±Comeau, Steeve
21Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
22Carbonate ion, standard deviation[CO3]2- std dev±Comeau, Steeve
23Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
24Aragonite saturation state, standard deviationOmega Arg std dev±Comeau, Steeve
25Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
26Calcite saturation state, standard deviationOmega Cal std dev±Comeau, Steeve
27Respiration rate, oxygenResp O2µmol/mg/hComeau, SteeveO2-meter (OXY-4 mini, PreSens)
28Respiration rate, oxygen, standard deviationResp O2 std dev±Comeau, SteeveCalculated
29Ammonium, excretion[NH4]+ excµmol/g/hComeau, SteeveColorimetric technique (Koroleff 1983) and a JenWay 6310 (Staffordshire, UK) flu
30Ammonium, excretion, standard deviation[NH4]+ exc std dev±Comeau, Steeve
31Calcification rate of calcium carbonateCalc rate CaCO3µmol/g/hComeau, SteeveAlkalinity anomaly technique (Smith and Key, 1975)
32Calcification rate, standard deviationCalc rate std dev±Comeau, Steeve
33Calcification rate of calcium carbonateCalc rate CaCO3µmol/g/hComeau, Steeve**45Ca incorporation
34Calcification rate, standard deviationCalc rate std dev±Comeau, Steeve
Size:
392 data points

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