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Eichner, Meri; Rost, Bjoern; Kranz, Sven A (2014): Diversity of ocean acidification effects on marine N2 fixers. PANGAEA,, Supplement to: Eichner, M et al. (2014): Diversity of ocean acidification effects on marine N2 fixers. Journal of Experimental Marine Biology and Ecology, 457, 199-207,

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Considering the important role of N2 fixation for primary productivity and CO2 sequestration, it is crucial to assess the response of diazotrophs to ocean acidification. Previous studies on the genus Trichodesmium suggested a strong sensitivity towards ocean acidification. In view of the large functional diversity in N2 fixers, the objective of this study was to improve our knowledge of the CO2 responses of other diazotrophs. To this end, the single-celled Cyanothece sp. and two heterocystous species, Nodularia spumigena and the symbiotic Calothrix rhizosoleniae, were acclimated to two pCO2 levels (380 vs. 980 µatm). Growth rates, cellular composition (carbon, nitrogen and chlorophyll a) as well as carbon and N2 fixation rates (14C incorporation, acetylene reduction) were measured and compared to literature data on different N2 fixers. The three species investigated in this study responded differently to elevated pCO2, showing enhanced, decreased as well as unaltered growth and production rates. For instance, Cyanothece increased production rates with pCO2, which is in line with the general view that N2 fixers benefit from ocean acidification. Due to lowered growth and production of Nodularia, nitrogen input to the Baltic Sea might decrease in the future. In Calothrix, no significant changes in growth or production could be observed, even though N2 fixation was stimulated under elevated pCO2. Reviewing literature data confirmed a large variability in CO2 sensitivity across diazotrophs. The contrasting response patterns in our and previous studies were discussed with regard to the carbonate chemistry in the respective natural habitats, the mode of N2 fixation as well as differences in cellular energy limitation between the species. The group-specific CO2 sensitivities will impact differently on future biogeochemical cycles of open-ocean environments and systems like the Baltic Sea and should therefore be considered in models estimating climate feedback effects.
Bacteria; Bottles or small containers/Aquaria (<20 L); Calothrix rhizosoleniae; Cyanobacteria; Cyanothece sp.; Growth/Morphology; Laboratory experiment; Laboratory strains; Nodularia spumigena; Not applicable; Other metabolic rates; Pelagos; Phytoplankton; Primary production/Photosynthesis; Single species
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 2014-07-30.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SpeciesSpeciesEichner, Meri
2TreatmentTreatEichner, Meri
3SalinitySalEichner, Meri
4Temperature, waterTemp°CEichner, Meri
5IrradianceEµmol/m2/sEichner, Meri
6pHpHEichner, MeriPotentiometricNBS scale
7pH, standard deviationpH std dev±Eichner, MeriPotentiometricNBS scale
8Alkalinity, totalATµmol/kgEichner, MeriPotentiometric titration
9Alkalinity, total, standard deviationAT std dev±Eichner, MeriPotentiometric titration
10Carbon, inorganic, dissolvedDICµmol/kgEichner, MeriCoulometric titration
11Carbon, inorganic, dissolved, standard deviationDIC std dev±Eichner, MeriCoulometric titration
12Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmEichner, MeriCalculated using CO2SYS
13Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Eichner, MeriCalculated using CO2SYS
14Growth rateµ1/dayEichner, Meri
15Growth rate, standard deviationµ std dev±Eichner, Meri
16Particulate organic carbon production, per chlorophyll aPOC prod/Chl aµmol/µg/dayEichner, Meri
17Particulate organic carbon, production, standard deviationPOC prod std dev±Eichner, Meriper Chl a
18Particulate organic nitrogen production, per chlorophyll aPON prod/Chl aµmol/µg/dayEichner, Meri
19Particulate organic nitrogen production, standard deviationPON prod std dev±Eichner, Meriper Chl a
20Carbon fixation rate, per chlorophyll aC fix/Chl aµmol/µg/dayEichner, Meri
21Carbon fixation rate, per chlorophyll a, standard deviationC fix/Chl a std dev±Eichner, Meri
22Ethene production, per chlorophyll aC2H4 prod/Chl aµmol/µg/dayEichner, Meri
23Ethene production standard deviationC2H4 prod std dev±Eichner, Meriper Chl a
24Carbon, organic, particulate/Nitrogen, organic, particulate ratioPOC/PONEichner, Meri
25Carbon, organic, particulate/Nitrogen, organic, particulate ratio, standard deviationPOC/PON std dev±Eichner, Meri
26Ethene production per cellC2H4 prodpmol/#/dayEichner, Meri
27Ethene production standard deviationC2H4 prod std dev±Eichner, Meriper cell
28Chlorophyll a per cellChl apg/#Eichner, Meri
29Chlorophyll a, standard deviationChl a std dev±Eichner, Meri
30Particulate organic carbon content per cellPOC contpmol/#Eichner, Meri
31Particulate organic carbon content per cell, standard deviationPOC cont std dev±Eichner, Meri
32Particulate organic nitrogen per cellPON cellpmol/#Eichner, Meri
33Particulate organic nitrogen per cell, standard deviationPON cell std dev±Eichner, Meri
34Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
35pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
36Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
37Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
38Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
39Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
40Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
41Alkalinity, totalATµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
42Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
43Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
241 data points

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