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Bi, Rong; Ismar, Stefanie M; Sommer, Ulrich; Zhao, Meixun (2017): Seawater carbonate chemistry, N/C and P/C biomass ratios, Polyunsaturated fatty acids of Rhodomonas sp. and Phaeodactylum tricornutum. PANGAEA, https://doi.org/10.1594/PANGAEA.883475, Supplement to: Bi, R et al. (2017): Environmental dependence of the correlations between stoichiometric and fatty acid-based indicators of phytoplankton nutritional quality. Limnology and Oceanography, 62(1), 334-347, https://doi.org/10.1002/lno.10429

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Abstract:
Marine phytoplankton is simultaneously affected by multiple environmental drivers. To-date integrative assessments of multiple combined effects are rare on the relationship between elemental stoichiometry and biochemicals in marine phytoplankton. We investigated responses of stoichiometric (N:C and P:C ratios) and fatty acid-based (polyunsaturated fatty acid, PUFA) indicators of nutritional quality to three N:P supply ratios (10:1, 24:1, and 63:1 mol/mol), three temperatures (12, 18, and 24°C) and two pCO2 levels (560 and 2400 µatm) in the marine phytoplankters Rhodomonas sp. and Phaeodactylum tricornutum. Overall, warming and nutrient deficiency showed dramatic effects, but increased pCO2 had modest effects on the two indicators of nutritional quality. Specifically, warming showed strong positive effects on N:C and P:C ratios in Rhodomonas sp. but negative effects on PUFAs in both species. The low N- and low P-media led to low contents of both nutrients but high contents of PUFAs in the biomass of Rhodomonas sp., while the response of P. tricornutum was more complex: N:C ratios were lowest at the intermediate N:P supply but P:C ratios responded negatively to P deficiency and positively to N deficiency. Large variations in the two indicators of nutritional quality can be attributed to species-specific physiological optima and interactions between the three manipulated variables. Our results suggest that stoichiometric and FA-based indicators of nutritional quality may change differentially in response to warming and nutrient deficiency in marine phytoplankton, highlighting the relevance of simultaneous considerations of the two indicators of nutritional quality, when assessing food web dynamics under future ocean scenarios.
Keyword(s):
Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria ( 20 L); Chromista; Laboratory experiment; Laboratory strains; Macro-nutrients; Not applicable; Ochrophyta; Pelagos; Phaeodactylum tricornutum; Phytoplankton; Rhodomonas sp.; Single species
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 2017-11-23.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TypeTypeZhao, Meixunstudy
2SpeciesSpeciesZhao, Meixun
3Registration number of speciesReg spec noZhao, Meixun
4Uniform resource locator/link to referenceURL refZhao, MeixunWoRMS Aphia ID
5Nitrogen/Phosphorus ratioN/PZhao, Meixunsupply ratio
6Temperature, waterTemp°CZhao, Meixuntreatment
7Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmZhao, Meixuntreatment
8Nitrogen cellular quotaQNµg/mgZhao, Meixun
9Polyunsaturated fatty acidsPUFAµg/mgZhao, Meixun
10RatioRatioZhao, Meixunparticulate organic nitrogen/PUFAs
11RatioRatioZhao, Meixunparticulate organic phosphorus/PUFAs
12Nitrogen/Carbon ratioN/CZhao, Meixunbiomass ratio
13Nitrogen/Carbon ratio, standard deviationN/C std dev±Zhao, Meixunbiomass ratio
14Phosphorus/Carbon ratioP/CZhao, Meixunbiomass ratio
15Phosphorus/Carbon ratio, standard deviationP/C std dev±Zhao, Meixunbiomass ratio
16Polyunsaturated fatty acidsPUFAµg/mgZhao, Meixunaverage
17Polyunsaturated fatty acids, standard deviationPUFA std dev±Zhao, Meixun
18SalinitySalZhao, Meixun
19Salinity, standard deviationSal std dev±Zhao, Meixun
20Carbon, inorganic, dissolvedDICµmol/kgZhao, Meixun
21Carbon, inorganic, dissolved, standard deviationDIC std dev±Zhao, Meixun
22Alkalinity, totalATµmol/kgZhao, Meixun
23Alkalinity, total, standard deviationAT std dev±Zhao, Meixun
24Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmZhao, Meixun
25Carbon dioxide, partial pressure, standard deviationpCO2 std dev±Zhao, Meixun
26Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
27pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
28Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
29Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
30Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
31Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
32Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
33Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
34Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
4633 data points

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