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Waldbusser, George G; Voigt, Erin P; Bergschneider, Heather; Green, Mark A; Newell, Roger I E (2011): Seawater carbonate chemistry and calcification rate of eastern oyster Crassostrea virginica, 2011. PANGAEA, https://doi.org/10.1594/PANGAEA.758181, Supplement to: Waldbusser, GG et al. (2011): Biocalcification in the Eastern Oyster (Crassostrea virginica) in Relation to Long-term Trends in Chesapeake Bay pH. Estuaries and Coasts, 34(2), 221-231, https://doi.org/10.1007/s12237-010-9307-0

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Abstract:
Anthropogenic carbon dioxide (CO2) emissions reduce pH of marine waters due to the absorption of atmospheric CO2 and formation of carbonic acid. Estuarine waters are more susceptible to acidification because they are subject to multiple acid sources and are less buffered than marine waters. Consequently, estuarine shell forming species may experience acidification sooner than marine species although the tolerance of estuarine calcifiers to pH changes is poorly understood. We analyzed 23 years of Chesapeake Bay water quality monitoring data and found that daytime average pH significantly decreased across polyhaline waters although pH has not significantly changed across mesohaline waters. In some tributaries that once supported large oyster populations, pH is increasing. Current average conditions within some tributaries however correspond to values that we found in laboratory studies to reduce oyster biocalcification rates or resulted in net shell dissolution. Calcification rates of juvenile eastern oysters, Crassostrea virginica, were measured in laboratory studies in a three-way factorial design with 3 pH levels, two salinities, and two temperatures. Biocalcification declined significantly with a reduction of ~0.5 pH units and higher temperature and salinity mitigated the decrease in biocalcification.
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 treatWaldbusser, George GSalinity
2Experimental treatmentExp treatWaldbusser, George GTemperature
3Experimental treatmentExp treatWaldbusser, George GpH
4SpeciesSpeciesWaldbusser, George G
5SalinitySalWaldbusser, George G
6Temperature, waterTemp°CWaldbusser, George GOrion Ross conductivity probe
7pHpHWaldbusser, George GOrion Ross conductivity probeNBS scale, H+ ion concentration in µmol/l
8Alkalinity, totalATmmol(eq)/lWaldbusser, George GTwo-point titration (Edmond 1970)
9Aragonite saturation stateOmega ArgWaldbusser, George GCalculated using CO2SYS
10Calcification rate of calcium carbonateCalc rate CaCO3mg/g/dayWaldbusser, George GAlkalinity anomaly technique (Smith and Key, 1975)
11Calcification rate, standard deviationCalc rate std dev±Waldbusser, George G
12pHpHWaldbusser, George GCalculatedNBS scale, H+ ion concentrationin µmol/kg
13Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale, H+ ion concentration in µmol/kg
15Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Carbon, inorganic, dissolvedDICµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
21Alkalinity, totalATµmol/kgWaldbusser, George GCalculated
22Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
23Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
376 data points

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