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Czerny, Jan; Barcelos e Ramos, Joana; Riebesell, Ulf (2009): Seawater carbonate chemistry and processes during experiments with cyanobacterium Nodularia spumigena, 2009. doi:10.1594/PANGAEA.726862,
Supplement to: Czerny, J et al. (2009): Influence of elevated CO2 concentrations on cell division and nitrogen fixation rates in the bloom-forming cyanobacterium Nodularia spumigena. Biogeosciences, 6(9), 1865-1875, doi:10.5194/bg-6-1865-2009

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Abstract:
The surface ocean absorbs large quantities of the CO2 emitted to the atmosphere from human activities. As this CO2 dissolves in seawater, it reacts to form carbonic acid. While this phenomenon, called ocean acidification, has been found to adversely affect many calcifying organisms, some photosynthetic organisms appear to benefit from increasing [CO2]. Among these is the cyanobacterium Trichodesmium, a predominant diazotroph (nitrogen-fixing) in large parts of the oligotrophic oceans, which responded with increased carbon and nitrogen fixation at elevated pCO2. With the mechanism underlying this CO2 stimulation still unknown, the question arises whether this is a common response of diazotrophic cyanobacteria. In this study we therefore investigate the physiological response of Nodularia spumigena, a heterocystous bloom-forming diazotroph of the Baltic Sea, to CO2-induced changes in seawater carbonate chemistry. N. spumigena reacted to seawater acidification/carbonation with reduced cell division rates and nitrogen fixation rates, accompanied by significant changes in carbon and phosphorus quota and elemental composition of the formed biomass. Possible explanations for the contrasting physiological responses of Nodularia compared to Trichodesmium may be found in the different ecological strategies of non-heterocystous (Trichodesmium) and heterocystous (Nodularia) cyanobacteria.
Event(s):
Czerny_etal_09 * Device: Experiment (EXP)
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 trtmCzerny, Jan
2SalinitySalCzerny, Jan
3Temperature, waterTemp°CCzerny, Jan
4Radiation, photosynthetically activePARµE/m2/sCzerny, Jan
5pHpHCzerny, JanCalculated using CO2SYSFree scale, constants (K1 and K2) by Roy et al. (1993)
6pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
7Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
8Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
9Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
10Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
11Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
12Carbon, inorganic, dissolvedDICµmol/kgCzerny, JanAutomated segmented-flow analyzer (Quaatro)Mean from start to end, constants (K1 and K2) by Roy et al. (1993)
13Alkalinity, totalATµmol/kgCzerny, JanTitration potentiometricConstants (K1 and K2) by Roy et al. (1993)
14Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
15Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Carbon, inorganic, dissolvedDICµmol/kgCzerny, JanAutomated segmented-flow analyzer (Quaatro)Start
17Carbon, inorganic, dissolvedDICµmol/kgCzerny, JanAutomated segmented-flow analyzer (Quaatro)End
18Carbon, inorganic, dissolvedDICµmol/kgCzerny, JanCalculatedConsumption, constants (K1 and K2) by Roy et al. (1993)
19Duration, number of daysDurationdaysCzerny, Jan
20Chlorophyll aChl aµg/lCzerny, JanFluorometryStart
21Chlorophyll aChl aµg/lCzerny, JanFluorometryEnd
22Phosphorus, organic, particulatePOPµmol/lCzerny, JanSpectrophotometer Hitachi U-2000
23Phosphorus, organic, particulatePOPµgCzerny, JanCalculatedIn cell
24Production of particulate organic phosphorus, per cellPOP prodpmol/#/dayCzerny, JanCalculated
25PhosphatePO4µmol/lCzerny, JanCalculatedConsumption during the experiment
26Nitrogen, organic, particulatePONµmol/lCzerny, JanElement analyser CNS, EURO EA
27Nitrogen per cellN cellpmolCzerny, Jan
28Production of particulate organic nitrogenPON prodpg/#/dayCzerny, Jan
29Carbon, organic, particulatePOCµmol/lCzerny, JanEnd
30Carbon per cellC cellpmolCzerny, Jan
31Production of particulate organic carbon per cellPOC prodpg/#/dayCzerny, JanCalculated
32Nodularia spumigenaN. spumigena#/lCzerny, JanCounting from imageStart
33Nodularia spumigenaN. spumigena#/lCzerny, JanCounting from imageEnd
34Cell division rateCell division#/dayCzerny, Jan
35Acetylene reductionC2H2 reductionµmol/l/hCzerny, Jan
36Nitrogen fixation rate, per cellN2 fixfmol/#/hCzerny, JanCalculatedCalculated using a convertion factor of 3
Size:
614 data points

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