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Data Publisher for Earth & Environmental Science

Hoppe, Clara Jule Marie; Hassler, Christel S; Payne, Christopher D; Tortell, Philippe Daniel; Rost, Bjoern; Trimborn, Scarlett (2014): Iron limitation modulates ocean acidification effects on southern ocean phytoplankton communities. PANGAEA, https://doi.org/10.1594/PANGAEA.836013, Supplement to: Hoppe, CJM et al. (2013): Iron limitation modulates ocean acidification effects in Southern Ocean phytoplankton communities. PLoS ONE, 8(11), e79890, https://doi.org/10.1371/journal.pone.0079890

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Abstract:
The potential interactive effects of iron (Fe) limitation and Ocean Acidification in the Southern Ocean (SO) are largely unknown. Here we present results of a long-term incubation experiment investigating the combined effects of CO2 and Fe availability on natural phytoplankton assemblages from the Weddell Sea, Antarctica. Active Chl a fluorescence measurements revealed that we successfully cultured phytoplankton under both Fe-depleted and Fe-enriched conditions. Fe treatments had significant effects on photosynthetic efficiency (Fv/Fm; 0.3 for Fe-depleted and 0.5 for Fe-enriched conditions), non-photochemical quenching (NPQ), and relative electron transport rates (rETR). pCO2 treatments significantly affected NPQ and rETR, but had no effect on Fv/Fm. Under Fe limitation, increased pCO2 had no influence on C fixation whereas under Fe enrichment, primary production increased with increasing pCO2 levels. These CO2-dependent changes in productivity under Fe-enriched conditions were accompanied by a pronounced taxonomic shift from weakly to heavily silicified diatoms (i.e. from Pseudo-nitzschia sp. to Fragilariopsis sp.). Under Fe-depleted conditions, this functional shift was absent and thinly silicified species dominated all pCO2 treatments (Pseudo-nitzschia sp. and Synedropsis sp. for low and high pCO2, respectively). Our results suggest that Ocean Acidification could increase primary productivity and the abundance of heavily silicified, fast sinking diatoms in Fe-enriched areas, both potentially leading to a stimulation of the biological pump. Over much of the SO, however, Fe limitation could restrict this possible CO2 fertilization effect.
Keyword(s):
Antarctic; Bottles or small containers/Aquaria (<20 L); Community composition and diversity; Entire community; Laboratory experiment; Micro-nutrients; Open ocean; Pelagos; Polar; Primary production/Photosynthesis
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0. https://cran.r-project.org/package=seacarb
Coverage:
Latitude: -70.000000 * Longitude: -38.000000
Event(s):
Weddell_Sea * Latitude: -70.000000 * Longitude: -38.000000
Comment:
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 2014-09-16.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1TableTabHoppe, Clara Jule Marie
2FigureFigHoppe, Clara Jule Marie
3DateDateHoppe, Clara Jule Marie
4Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHoppe, Clara Jule Marietreatment
5TreatmentTreatHoppe, Clara Jule MarieFe
6IdentificationIDHoppe, Clara Jule Mariebottle
7Photosynthetic efficiency (deltaF/Fm)deltaF/FmHoppe, Clara Jule Marie1h dark acclimated; dimensionless
8Net primary production of carbon per particulate organic carbonNPP C/POCnmol/µmol/hHoppe, Clara Jule Marie
9Chlorophyll a/particulate organic carbon ratioChl a/POCHoppe, Clara Jule Marie
10Photosynthetic efficiency (deltaF/Fm)deltaF/FmHoppe, Clara Jule Marie
11Effective absorbance cross-section of photosystem IIsigma PSIIA2/quantaHoppe, Clara Jule Marie
12Non photochemical quenchingNPQHoppe, Clara Jule Marie
13Electron transport rate, relativerETRµmol e/m2/sHoppe, Clara Jule Marie
14SpeciesSpeciesHoppe, Clara Jule Marie
15PercentagePerc%Hoppe, Clara Jule Marieof total cell count
16Percentage, standard deviationPerc std dev±Hoppe, Clara Jule Marie
17Iron, dissolvedFe dissµmol/kgHoppe, Clara Jule Marie
18Iron, dissolved, standard deviationFe diss std dev±Hoppe, Clara Jule Marie
19SalinitySalHoppe, Clara Jule Marie
20Temperature, waterTemp°CHoppe, Clara Jule Marie
21PhosphatePHSPHTµmol/kgHoppe, Clara Jule Marie
22SilicateSILCATµmol/kgHoppe, Clara Jule Marie
23Carbon, inorganic, dissolvedDICµmol/kgHoppe, Clara Jule MarieCoulometric titration
24Carbon, inorganic, dissolved, standard deviationDIC std dev±Hoppe, Clara Jule MarieCoulometric titration
25Alkalinity, totalATµmol/kgHoppe, Clara Jule MariePotentiometric titration
26Alkalinity, total, standard deviationAT std dev±Hoppe, Clara Jule MariePotentiometric titration
27pHpHHoppe, Clara Jule MariePotentiometrictotal scale
28pH, standard deviationpH std dev±Hoppe, Clara Jule MariePotentiometrictotal scale
29Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHoppe, Clara Jule MariePotentiometric titration
30Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Hoppe, Clara Jule MariePotentiometric titration
31Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
32Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
33Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
34Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
35Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
36Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
37Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
38Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
39Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
7300 data points

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