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Brading, Patrick; Warner, Mark E; Davey, Philip; Smith, David J; Achterberg, Eric Pieter; Suggett, David J (2011): Seawater carbonate chemistry and growth rate during experiments with phylotypes of Symbiodinium (Dinophyceae), 2011. PANGAEA,, Supplement to: Brading, P et al. (2011): Differential effects of ocean acidification on growth and photosynthesis among phylotypes of Symbiodinium (Dinophyceae). Limnology and Oceanography, 56(3), 927-938,

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We investigated the effect of elevated partial pressure of CO2 (pCO2) on the photosynthesis and growth of four phylotypes (ITS2 types A1, A13, A2, and B1) from the genus Symbiodinium, a diverse dinoflagellate group that is important, both free-living and in symbiosis, for the viability of cnidarians and is thus a potentially important model dinoflagellate group. The response of Symbiodinium to an elevated pCO2 was phylotype-specific. Phylotypes A1 and B1 were largely unaffected by a doubling in pCO2 in contrast, the growth rate of A13 and the photosynthetic capacity of A2 both increased by ~ 60%. In no case was there an effect of ocean acidification (OA) upon respiration (dark- or light-dependent) for any of the phylotypes examined. Our observations suggest that OA might preferentially select among free-living populations of Symbiodinium, with implications for future symbioses that rely on algal acquisition from the environment (i.e., horizontal transmission). Furthermore, the carbon environment within the host could differentially affect the physiology of different Symbiodinium phylotypes. The range of responses we observed also highlights that the choice of species is an important consideration in OA research and that further investigation across phylogenetic diversity, for both the direction of effect and the underlying mechanism(s) involved, is warranted.
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).
#NameShort NameUnitPrincipal InvestigatorMethodComment
1IdentificationIDBrading, Patrick
2Experimental treatmentExp treatBrading, Patrick
3SalinitySalBrading, Patrick
4Temperature, waterTemp°CBrading, Patrick
5Radiation, photosynthetically activePARµmol/m2/sBrading, Patrick
6pHpHBrading, PatrickRoss Ultra pH electrode (model 8103BNUWP, Thermo Fisher Scientific)Total scale
7Alkalinity, totalATµmol/kgBrading, PatrickCalculated using CO2SYS
8Alkalinity, total, standard errorAT std e±Brading, Patrick
9Carbon, inorganic, dissolvedDICµmol/kgBrading, PatrickTOC analyzer (Shimadzu)
10Carbon, inorganic, dissolved, standard errorDIC std e±Brading, Patrick
11Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmBrading, PatrickCalculated using CO2SYS
12Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard errorpCO2water_SST_wet std e±Brading, Patrick
13Bicarbonate ion[HCO3]-µmol/kgBrading, PatrickCalculated using CO2SYS
14Bicarbonate ion, standard error[HCO3]- std e±Brading, Patrick
15Carbonate ion[CO3]2-µmol/kgBrading, PatrickCalculated using CO2SYS
16Carbonate ion, standard error[CO3]2- std e±Brading, Patrick
17Carbon dioxideCO2µmol/kgBrading, PatrickCalculated using CO2SYS
18Carbon dioxide, standard errorCO2 std e±Brading, Patrick
19Calcite saturation stateOmega CalBrading, PatrickCalculated using CO2SYS
20Calcite saturation state, standard deviationOmega Cal std dev±Brading, Patrick
21Aragonite saturation stateOmega ArgBrading, PatrickCalculated using CO2SYS
22Aragonite saturation state, standard deviationOmega Arg std dev±Brading, Patrick
23Maximum potential capacity of photosynthesis, oxygen production, per cellPmax O2fmol/#/hBrading, Patrick
24Photosynthetic efficiency per cell, oxygen productionalpha(fmol/#/h)/(µmol photons)Brading, Patrick
25Light saturationEkµmol/m2/sBrading, Patrick
26Carbon/Chlorophyll a ratioC/Chl aBrading, Patrick[g/g]
27Growth rateµ#/dayBrading, PatrickCalculated
28Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
29Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
30Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
31Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
32Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
33Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
34Alkalinity, totalATµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
35Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
36Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
5700 data points

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