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Frieder, Christina A; Gonzalez, Jennifer P; Levin, Lisa A (2014): Uranium in larval shells as a barometer of molluscan ocean acidification exposure. PANGAEA,, Supplement to: Frieder, CA et al. (2014): Uranium in Larval Shells as a barometer of Molluscan Ocean Acidification Exposure. Environmental Science & Technology, 48(11), 6401-6408,

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As the ocean undergoes acidification, marine organisms will become increasingly exposed to reduced pH, yet variability in many coastal settings complicates our ability to accurately estimate pH exposure for those organisms that are difficult to track. Here we present shell-based geochemical proxies that reflect pH exposure from laboratory and field settings in larvae of the mussels Mytilus californianus and M. galloprovincialis. Laboratory-based proxies were generated from shells precipitated at pH 7.51 to 8.04. U/Ca, Sr/Ca, and multielemental signatures represented as principal components varied with pH for both species. Of these, U/Ca was the best predictor of pH and did not vary with larval size, with semidiurnal pH fluctuations, or with oxygen concentration. Field applications of U/Ca were tested with mussel larvae reared in situ at both known and unknown pH conditions. Larval shells precipitated in a region of greater upwelling had higher U/Ca, and these U/Ca values corresponded well with the laboratory-derived U/Ca-pH proxy. Retention of the larval shell after settlement in molluscs allows use of this geochemical proxy to assess ocean acidification effects on marine populations.
Original version:
Levin, Lisa A (2014): Dataset: Mussel shell trace element ratios. Biological and Chemical Oceanography Data Management Office,
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0.
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 2014-10-17.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1SpeciesSpeciesFrieder, Christina A
2TreatmentTreatFrieder, Christina A
3Sample IDSample IDFrieder, Christina A
4ReplicateReplicateFrieder, Christina A
5Magnesium/Calcium ratioMg/Cammol/molFrieder, Christina A
6Copper/Calcium ratioCu/Caµmol/molFrieder, Christina A
7Zinc/Calcium ratioZn/Caµmol/molFrieder, Christina A
8Strontium/Calcium ratioSr/Cammol/molFrieder, Christina A
9Barium/Calcium ratioBa/Caµmol/molFrieder, Christina A
10Lead/Calcium ratioPb/Canmol/molFrieder, Christina A
11Uranium/Calcium ratioU/Caµmol/molFrieder, Christina A
12pHpHFrieder, Christina ASpectrophotometrictotal scale
13OxygenOXYGENµmol/kgFrieder, Christina A
14Temperature, waterTemp°CFrieder, Christina A
15SalinitySalFrieder, Christina A
16Alkalinity, totalATµmol/kgFrieder, Christina APotentiometric titration
17Carbonate ion[CO3]2-µmol/kgFrieder, Christina ACalculated using CO2SYS
18Uranium/Calcium ratioU/Caµmol/molFrieder, Christina Aseawater
19Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
20Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
21Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, 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)
23Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
24Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
26Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
27Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
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