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Sugie, Koji; Endo, H; Suzuki, Koji; Nishioka, Jun; Kiyosawa, H; Yoshimura, T (2013): Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.846343, Supplement to: Sugie, K et al. (2013): Synergistic effects of pCO2 and iron availability on nutrient consumption ratio of the Bering Sea phytoplankton community. Biogeosciences, 10(10), 6309-6321, https://doi.org/10.5194/bg-10-6309-2013

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Abstract:
Little is known concerning the effect of CO2 on phytoplankton ecophysiological processes under nutrient and trace element-limited conditions, because most CO2 manipulation experiments have been conducted under elements-replete conditions. To investigate the effects of CO2 and iron availability on phytoplankton ecophysiology, we conducted an experiment in September 2009 using a phytoplankton community in the iron limited, high-nutrient, low-chlorophyll (HNLC) region of the Bering Sea basin . Carbonate chemistry was controlled by the bubbling of the several levels of CO2 concentration (180, 380, 600, and 1000 ppm) controlled air, and two iron conditions were established, one with and one without the addition of inorganic iron. We demonstrated that in the iron-limited control conditions, the specific growth rate and the maximum photochemical quantum efficiency (Fv/Fm) of photosystem (PS) II decreased with increasing CO2 levels, suggesting a further decrease in iron bioavailability under the high-CO2 conditions. In addition, biogenic silica to particulate nitrogen and biogenic silica to particulate organic carbon ratios increased from 2.65 to 3.75 and 0.39 to 0.50, respectively, with an increase in the CO2 level in the iron-limited controls. By contrast, the specific growth rate, Fv/Fm values and elemental compositions in the iron-added treatments did not change in response to the CO2 variations, indicating that the addition of iron canceled out the effect of the modulation of iron bioavailability due to the change in carbonate chemistry. Our results suggest that high-CO2 conditions can alter the biogeochemical cycling of nutrients through decreasing iron bioavailability in the iron-limited HNLC regions in the future.
Keyword(s):
Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (<20 L); Community composition and diversity; Entire community; Laboratory experiment; Micro-nutrients; North Pacific; Open ocean; Pelagos; Primary production/Photosynthesis; Temperate
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.6. https://cran.r-project.org/package=seacarb
Project(s):
Ocean Acidification International Coordination Centre (OA-ICC)
Coverage:
Latitude: 53.083330 * Longitude: -177.000000
Date/Time Start: 2009-09-09T00:00:00 * Date/Time End: 2009-09-30T00:00:00
Event(s):
Bering_Sea_OA * Latitude: 53.083330 * Longitude: -177.000000 * Date/Time Start: 2009-09-09T00:00:00 * Date/Time End: 2009-09-30T00:00:00 * Method/Device: Experiment (EXP)
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2015-05-21.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1TreatmentTreatSugie, Koji
2Day of experimentDOEdaySugie, Kojisampling
3Temperature, waterTemp°CSugie, Koji
4SalinitySalSugie, Koji
5Alkalinity, totalATµmol/kgSugie, KojiPotentiometric titration
6Carbon, inorganic, dissolvedDICµmol/kgSugie, KojiCoulometric titration
7Iron, dissolvedFe dissnmol/lSugie, Koji
8Ammonium[NH4]+µmol/lSugie, Koji
9Nitrate and Nitrite[NO3]- + [NO2]-µmol/lSugie, Koji
10Phosphate[PO4]3-µmol/lSugie, Koji
11SilicateSi(OH)4µmol/lSugie, Koji
12Chlorophyll aChl aµg/lSugie, Kojilarge (>10 µm)
13Chlorophyll aChl aµg/lSugie, Kojismall (<10 µm)
14Carbon, organic, particulatePOCµmol/lSugie, Koji
15Nitrogen, total, particulateTPNµmol/lSugie, Koji
16Biogenic silicabSiO2µmol/lSugie, Koji
17Maximum photochemical quantum yield of photosystem IIFv/FmSugie, Koji
18Maximum photochemical quantum yield of photosystem II, standard deviationFv/Fm std dev±Sugie, Koji
19SpeciesSpeciesSugie, Koji
20PercentagePerc%Sugie, Koji
21Fluorescence intensityFluorescenceSugie, KojiPDMPO
22Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
23pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
24Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
25Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
26Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
27Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
28Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
29Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
30Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
7241 data points

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