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Trimborn, Scarlett (2019): Acidification and irradiance effect on the photo-physiological fitness, growth and carbon production of the Antarctic cryptophyte Geminigera cryophila. PANGAEA,, Supplement to: Trimborn, Scarlett; Thoms, Silke; Karitter, Pascal; Bischof, Kai (2019): Ocean acidification and high irradiance stimulate growth of the Antarctic cryptophyte Geminigera cryophila. Biogeosciences, 16, 2997–3008,

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Ecophysiological studies on Antarctic cryptophytes to assess whether climatic changes such as ocean acidification and enhanced stratification affect their growth in Antarctic coastal waters in the future are lacking so far. This is the first study that investigates the combined effects of the increasing availability of pCO2 (400 and 1000 μatm) and irradiance (20, 200 and 500 μmol photons m-2 s-1) on growth, elemental composition and photo-physiology of the Antarctic cryptophyte Geminigera cryophila. Under ambient pCO2, this species was characterized by a pronounced sensitivity to increasing irradiance with complete growth inhibition at the highest light intensity. Interestingly, when grown under high pCO2 this negative light effect vanished, and it reached the highest rates of growth and particulate organic carbon production at the highest irradiance compared to the other tested experimental conditions. Our results for G. cryophila reveal beneficial effects of ocean acidification in conjunction with enhanced irradiance on growth and photosynthesis. Hence, cryptophytes such as G. cryophila may be potential winners of climate change, potentially thriving better in more stratified and acidic coastal waters and contributing in higher abundance to future phytoplankton assemblages of coastal Antarctic waters.
cryptophytes; irradiance; Ocean acidification; Southern Ocean
#999: not grown
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1TypeTypeTrimborn, Scarlett
2SpeciesSpeciesTrimborn, Scarlett
3Registration number of speciesReg spec noTrimborn, Scarlett
4Uniform resource locator/link to referenceURL refTrimborn, ScarlettWoRMS Aphia ID
5Treatment: light intensityT:Ioµmol/m2/sTrimborn, ScarlettIrradiance
6Treatment: partial pressure of carbon dioxideTreat pCO2µatmTrimborn, ScarlettPartial pressure of carbon dioxide (water) at sea surface temperature (wet air)
7Phytoplankton growth ratePhytopl µ1/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, Scarlettpg C/cell
11Production of particulate organic carbon per cellPOC prodpg/#/dayTrimborn, Scarlett
12Particulate organic carbon, production, standard deviationPOC prod std dev±Trimborn, Scarlettpg C/cell/day
13Nitrogen, organic, particulate, per cellPONpg/#Trimborn, Scarlett
14Nitrogen, organic, particulate, per cell, standard deviationPON std dev±Trimborn, Scarlett
15Production of particulate organic nitrogenPON prodpg/#/dayTrimborn, Scarlett
16Particulate organic nitrogen production, standard deviationPON prod std dev±Trimborn, Scarlettpg N/cell/day
17Carbon/Nitrogen ratioC/Nmol/molTrimborn, Scarlett
18Carbon/Nitrogen ratio, standard deviationC/N std dev±Trimborn, Scarlett
19Maximum photochemical quantum yield of photosystem IIFv/FmTrimborn, Scarlett
20Maximum photochemical quantum yield of photosystem II, standard deviationFv/Fm std dev±Trimborn, Scarlett
21RecoveryRecovery%Trimborn, ScarlettFv/Fm recovery [% of initial]
22Standard deviationStd dev±Trimborn, ScarlettFv/Fm recovery [% of initial] std dev
23Functional photosystem II reaction centersRCIIzmol/cellTrimborn, Scarlett
24Functional photosystem II reaction centers, standard deviationRCII std dev±Trimborn, Scarlett
25Connectivity between photosystem IIpTrimborn, Scarlett
26Connectivity between photosystem II, standard deviationp std dev±Trimborn, Scarlett
27Functional absorption cross sections of photosystem II reaction centersSigma PSIInm2Trimborn, Scarlett
28Functional absorption cross sections of photosystem II reaction centers, standard deviationSigma PSII std dev±Trimborn, Scarlett
29Re-oxidation time of the Qa acceptortQaµsTrimborn, Scarlett
30Re-oxidation time of the Qa acceptor, standard deviationtQa std dev±Trimborn, Scarlett
31IrradianceEµmol/m2/sTrimborn, Scarlett
32Electron transport rate, absoluteaETRe/PSII/sTrimborn, Scarlett
33Electron transport rate, absolute, standard deviationaETR std dev±Trimborn, Scarlett
34Non photochemical quenchingNPQTrimborn, Scarlett
35Non photochemical quenching, standard deviationNPQ std dev±Trimborn, Scarlett
640 data points

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