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Trimborn, Scarlett; Thoms, Silke; Brenneis, Tina; Heiden, Jasmin; Beszteri, Sara; Bischof, Kai (2017): Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica. PANGAEA, https://doi.org/10.1594/PANGAEA.874781, Supplement to: Trimborn, S et al. (2017): Two Southern Ocean diatoms are more sensitive to ocean acidification and changes in irradiance than the prymnesiophyte Phaeocystis antarctica. Physiologia Plantarum, https://doi.org/10.1111/ppl.12539

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Abstract:
To better understand the impact of ocean acidification (OA) and changes in light availability on Southern Ocean phytoplankton physiology, we investigated the effects of pCO2 (380 and 800 µatm) in combination with low and high irradiance (20 or 50 and 200 µmol photons/m2/s) on growth, particulate organic carbon (POC) fixation and photophysiology in the three ecologically relevant species Chaetoceros debilis, Fragilariopsis kerguelensis and Phaeocystis antarctica. Irrespective of the light scenario, neither growth nor POC per cell was stimulated by OA in any of the tested species and the two diatoms even displayed negative responses in growth (e.g. C. debilis) or POC content (e.g. F. kerguelensis) under OA in conjunction with high light. For both diatoms, also maximum quantum yields of PSII (Fv/Fm) were decreased under these conditions, indicating lowered photochemical efficiencies. To counteract the negative effects by OA and high light, the two diatoms showed diverging photoacclimation strategies. While cellular chlorophyll a and fucoxanthin contents were enhanced in C. debilis to potentially maximize light absorption, F. kerguelensis exhibited reduced chlorophyll a per cell, increased disconnection of antennae from photosystem II reaction centers and strongly lowered absolute electron transport rates (ETR). The decline in ETRs in F. kerguelensis might be explained in terms of different species-specific strategies for tuning the available flux of adenosine triphosphate and nicotinamide adenine dinucleotide phosphate. Overall, our results revealed that P. antarctica was more tolerant to OA and changes in irradiance than the two diatoms, which may have important implications for biogeochemical cycling.
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1. https://cran.r-project.org/package=seacarb
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 by seacarb is 2017-04-21.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TypeTypeTrimborn, Scarlettstudy
2SpeciesSpeciesTrimborn, Scarlett
3Registration number of speciesReg spec noTrimborn, Scarlett
4Uniform resource locator/link to referenceURL refTrimborn, ScarlettWoRMS Aphia ID
5TreatmentTreatTrimborn, Scarlettlight level
6Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmTrimborn, Scarletttreatment
7Growth rateµ1/dayTrimborn, Scarlett
8Growth rate, standard deviationµ std dev±Trimborn, Scarlett
9Carbon, organic, particulate, per cellPOCpg/#Trimborn, Scarlett
10Carbon, organic, particulate, standard deviationPOC std dev±Trimborn, Scarlett
11Carbon/Nitrogen ratioC/NTrimborn, Scarlett
12Carbon/Nitrogen ratio, standard deviationC/N std dev±Trimborn, Scarlett
13Maximum photochemical quantum yield of photosystem IIFv/FmTrimborn, Scarlett
14Maximum photochemical quantum yield of photosystem II, standard deviationFv/Fm std dev±Trimborn, Scarlett
15YieldYield%Trimborn, Scarlettyield recovery after short-term light stress (% of initial)
16Yield, standard deviationY std dev±Trimborn, Scarlettyield recovery after short-term light stress (% of initial)
17IrradianceEµmol/m2/sTrimborn, Scarlett
18Electron transport rateETRµmol e/m2/sTrimborn, Scarlett
19Electron transport rate, standard deviationETR std dev±Trimborn, Scarlett
20Non photochemical quenchingNPQTrimborn, Scarlett
21Non photochemical quenching, standard deviationNPQ std dev±Trimborn, Scarlett
22Temperature, waterTemp°CTrimborn, Scarlett
23SalinitySalTrimborn, Scarlett
24Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmTrimborn, Scarlett
25Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Trimborn, Scarlett
26Carbon dioxideCO2µmol/kgTrimborn, Scarlett
27Carbon dioxide, standard deviationCO2 std dev±Trimborn, Scarlett
28Carbon, inorganic, dissolvedDICµmol/kgTrimborn, Scarlett
29Carbon, inorganic, dissolved, standard deviationDIC std dev±Trimborn, Scarlett
30Alkalinity, totalATµmol/kgTrimborn, Scarlett
31Alkalinity, total, standard deviationAT std dev±Trimborn, Scarlett
32pHpHTrimborn, ScarlettNBS scale
33pH, standard deviationpH std dev±Trimborn, ScarlettNBS scale
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)
37Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
38Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_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)
41Carbon, inorganic, dissolvedDICµmol/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)
Size:
7396 data points

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