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Li, Yahe; Gao, Kunshan; Villafañe, Virginia E; Helbling, E Walter (2012): Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.823078, Supplement to: Li, Y et al. (2012): Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum. Biogeosciences, 9(10), 3931-3942, https://doi.org/10.5194/bg-9-3931-2012

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Abstract:
Increasing atmospheric CO2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO2 concentrations (390 and 1000 µatm) for more than 20 generations. Compared to the ambient CO2 level (390 µatm), growth at the elevated CO2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased pCO2 and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 °C, the elevated CO2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation.
Keyword(s):
Bottles or small containers/Aquaria (<20 L); Chromista; Laboratory experiment; Laboratory strains; Light; North Pacific; Ochrophyta; Pelagos; Phaeodactylum tricornutum; Primary production/Photosynthesis; Single species; Temperature
Further details:
Lavigne, Héloïse; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4 [webpage]. https://cran.r-project.org/package=seacarb
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). The date of carbonate chemistry calculation by seacarb is 2013-11-15.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SpeciesSpeciesLi, Yahe
2IdentificationIDLi, Yahe
3Temperature, waterTemp°CLi, Yahe
4TreatmentTreatLi, YahePAB=PAR+UVA+UVB, PA=PAR+UVA, P=PAR (400-700 nm), UVA (315-400 nm), UVB (280-315 nm), UVR (280-400 nm); HC=high pCO2, LC=low pCO2
5Time in minutesTimeminLi, Yaheexposure time
6Effective quantum yieldYLi, Yahe
7Damage ratek1/minLi, Yahe
8Damage rate, standard deviationk std dev±Li, Yahe
9Repair rater1/minLi, Yahe
10Repair rate, standard deviationr std dev±Li, Yahe
11Non photochemical quenchingNPQLi, Yahe
12Non photochemical quenching, standard deviationNPQ std dev±Li, Yahe
13Damage/repair ratiok/rLi, Yahe
14Damage/repair ratio, standard deviationk/r standard deviation±Li, Yahe
15Time in minutesTimeminLi, Yaherecovery time
16Net photosynthesis rate, per cellPN/cellpg/#/hLi, Yahe
17Net photosynthesis rate, standard deviationPN std dev±Li, Yahe
18Ultraviolet radiation-induced inhibition of photosynthesisUVR-induced inhibition of PN%Li, Yahe
19Ultraviolet radiation-induced inhibition of photosynthesis, standard deviationUVR-induced inhibition of PN std dev±Li, Yahe
20Temperature, waterTemp°CLi, Yahe
21SalinitySalLi, Yahe
22Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmLi, Yahe
23pHpHLi, YahePotentiometricNBS scale
24pH, standard deviationpH std dev±Li, YahePotentiometricNBS scale
25Carbon, inorganic, dissolvedDICµmol/kgLi, YaheCalculated using CO2SYS
26Carbon, inorganic, dissolved, standard deviationDIC std dev±Li, YaheCalculated using CO2SYS
27Bicarbonate ion[HCO3]-µmol/kgLi, YaheCalculated using CO2SYS
28Bicarbonate ion, standard deviation[HCO3]- std dev±Li, YaheCalculated using CO2SYS
29Carbonate ion[CO3]2-µmol/kgLi, YaheCalculated using CO2SYS
30Carbonate ion, standard deviation[CO3]2- std dev±Li, YaheCalculated using CO2SYS
31Carbon dioxideCO2µmol/kgLi, YaheCalculated using CO2SYS
32Alkalinity, totalATµmol/kgLi, YaheCalculated using CO2SYS
33Alkalinity, total, standard deviationAT std dev±Li, YaheCalculated using CO2SYS
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)
38Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
39Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
40Carbon, inorganic, dissolvedDICµmol/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)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
41489 data points

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