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Godinot, Claire; Houlbrèque, Fanny; Grover, Renaud; Ferrier-Pagès, Christine (2011): Seawater carbonate chemistry, nutrient uptake and biological processes of coral Stylophora pistillata during experiments, 2011. PANGAEA, https://doi.org/10.1594/PANGAEA.771571, Supplement to: Godinot, C et al. (2011): Coral uptake of inorganic phosphorus and nitrogen negatively affected by simultaneous changes in temperature and pH. PLoS ONE, 6(9), e25024, https://doi.org/10.1371/journal.pone.0025024

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Abstract:
The effects of ocean acidification and elevated seawater temperature on coral calcification and photosynthesis have been extensively investigated over the last two decades, whereas they are still unknown on nutrient uptake, despite their importance for coral energetics. We therefore studied the separate and combined impacts of increases in temperature and pCO2 on phosphate, ammonium, and nitrate uptake rates by the scleractinian coral S. pistillata. Three experiments were performed, during 10 days i) at three pHT conditions (8.1, 7.8, and 7.5) and normal temperature (26°C), ii) at three temperature conditions (26°, 29°C, and 33°C) and normal pHT(8.1), and iii) at three pHT conditions (8.1, 7.8, and 7.5) and elevated temperature (33°C). After 10 days of incubation, corals had not bleached, as protein, chlorophyll, and zooxanthellae contents were the same in all treatments. However, photosynthetic rates significantly decreased at 33°C, and were further reduced for the pHT 7.5. The photosynthetic efficiency of PSII was only decreased by elevated temperature. Nutrient uptake rates were not affected by a change in pH alone. Conversely, elevated temperature (33°C) alone induced an increase in phosphate uptake but a severe decrease in nitrate and ammonium uptake rates, even leading to a release of nitrogen into seawater. Combination of high temperature (33°C) and low pHT(7.5) resulted in a significant decrease in phosphate and nitrate uptake rates compared to control corals (26°C, pHT = 8.1). These results indicate that both inorganic nitrogen and phosphorus metabolism may be negatively affected by the cumulative effects of ocean warming and acidification.
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
1SalinitySalGodinot, Claire
2Temperature, waterTemp°CGodinot, Claire
3pHpHGodinot, ClairepH meter (Metrohm, 826 pH mobile)Total scale
4Alkalinity, totalATµmol/kgGodinot, ClaireAlkalinity, Gran titration (Gran, 1950)
5Alkalinity, total, standard deviationAT std dev±Godinot, Claire
6Radiation, photosynthetically activePARµmol/m2/sGodinot, Claire
7Light:Dark cycleL:Dhh:hhGodinot, Claire
8Electron transport rate of photosystem IIETR PSIIGodinot, Clairepulseamplitude-modulated chlorophyll fluorometry (diving PAM, Waltz, Germany)
9Oxygen flux per chlorophyll aO2 fluxµmol/mg/hGodinot, Claire
10Stylophora pistillata, zooxanthellate cell densityS. pistillata zoox#/cm2Godinot, Clairesee reference(s)
11Stylophora pistillata, chlorophyll contentS. pistillata chlµg/cm2Godinot, Clairesee reference(s)
12Stylophora pistillata, protein contentS. pistillata proteinmg protein/cm2Godinot, Clairesee reference(s)
13Maximum photochemical quantum yield of photosystem IIFv/FmGodinot, Claire
14Nutrient uptake rate per chlorophyllNutrient uptµmol/mg/hGodinot, ClaireSpectrophotometryPO4
15Nutrient uptake rate per chlorophyllNutrient uptµmol/mg/hGodinot, ClaireSpectrofluorometryNH4
16Nutrient uptake rate per chlorophyllNutrient uptµmol/mg/hGodinot, ClaireAutoanalyzerNO3
17Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
21Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
22Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
23Carbon, inorganic, dissolvedDICµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
24Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
25Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
10336 data points

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