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Hofmann, Laurie C; Bischof, Kai; Baggini, Cecilia; Johnson, Andrew; Koop-Jakobsen, Ketil; Teichberg, Mirta (2015): CO2 and inorganic nutrient enrichment affect the performance of a calcifying green alga and its noncalcifying epiphyte. PANGAEA, https://doi.org/10.1594/PANGAEA.847446, Supplement to: Hofmann, LC et al. (2015): CO2 and inorganic nutrient enrichment affect the performance of a calcifying green alga and its noncalcifying epiphyte. Oecologia, 177(4), 1157-1169, https://doi.org/10.1007/s00442-015-3242-5

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Abstract:
Ocean acidification studies in the past decade have greatly improved our knowledge of how calcifying organisms respond to increased surface ocean CO2 levels. It has become evident that, for many organisms, nutrient availability is an important factor that influences their physiological responses and competitive interactions with other species. Therefore, we tested how simulated ocean acidification and eutrophication (nitrate and phosphate enrichment) interact to affect the physiology and ecology of a calcifying chlorophyte macroalga (Halimeda opuntia (L.) J.V. Lamouroux) and its common noncalcifying epiphyte (Dictyota sp.) in a 4-week fully crossed multifactorial experiment. Inorganic nutrient enrichment (+NP) had a strong influence on all responses measured with the exception of net calcification. Elevated CO2 alone significantly decreased electron transport rates of the photosynthetic apparatus and resulted in phosphorus limitation in both species, but had no effect on oxygen production or respiration. The combination of CO2 and +NP significantly increased electron transport rates in both species. While +NP alone stimulated H. opuntia growth rates, Dictyota growth was significantly stimulated by nutrient enrichment only at elevated CO2, which led to the highest biomass ratios of Dictyota to Halimeda. Our results suggest that inorganic nutrient enrichment alone stimulates several aspects of H. opuntia physiology, but nutrient enrichment at a CO2 concentration predicted for the end of the century benefits Dictyota sp. and hinders its calcifying basibiont H. opuntia.
Keyword(s):
Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria ( 20 L); Calcification/Dissolution; Chlorophyta; Coast and continental shelf; Dictyota sp.; Growth/Morphology; Halimeda opuntia; Laboratory experiment; Macroalgae; Macro-nutrients; North Atlantic; Plantae; Primary production/Photosynthesis; Respiration; Single species; Tropical
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.6. https://cran.r-project.org/package=seacarb
Coverage:
Latitude: 12.124740 * Longitude: -68.973030
Date/Time Start: 2012-01-01T00:00:00 * Date/Time End: 2012-01-31T00:00:00
Event(s):
Curacao * Latitude: 12.124740 * Longitude: -68.973030 * Date/Time Start: 2012-01-01T00:00:00 * Date/Time End: 2012-01-31T00:00:00 * Device: Experiment (EXP)
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2015-06-01.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TableTabHofmann, Laurie C
2FigureFigHofmann, Laurie C
3SpeciesSpeciesHofmann, Laurie C
4Sample IDSample IDHofmann, Laurie C
5ChangeChange%Hofmann, Laurie Ccoverage
6IdentificationIDHofmann, Laurie C
7TreatmentTreatHofmann, Laurie Ctwo CO2 levels (380, and 1200 µatm CO2) and two inorganic nutrient levels (nitrate and phosphate enriched: 50 µM [NO3]2-, 5 µM [PO4]3- or unenriched: 1.4 µM [NO3]2-, 0.09 µM [PO4]3-)
8Carbon, organic, particulatePOC%Hofmann, Laurie C
9Nitrogen, total particulateTPN%Hofmann, Laurie C
10Calcium carbonateCaCO3%Hofmann, Laurie C
11Carbon, organic, particulate/Nitrogen, particulate ratioPOC/PNHofmann, Laurie Cmolar
12PhosphatesPhosphates%Hofmann, Laurie C
13Nitrogen/Phosphorus ratioN/PHofmann, Laurie Cmolar
14Net photosynthesis rate, oxygenPN O2µmol/g/hHofmann, Laurie C
15CommentCommentHofmann, Laurie Cnet photosynthesis rate
16Respiration rate, oxygenResp O2µmol/g/hHofmann, Laurie C
17CommentCommentHofmann, Laurie Crespiration rate
18Incubation durationInc durweeksHofmann, Laurie C
19Calcification rateCalc ratemg/dayHofmann, Laurie C
20Growth rateµ%/dayHofmann, Laurie C
21IrradianceEµmol/m2/sHofmann, Laurie C
22Maximum photochemical quantum yield of photosystem IIFv/FmHofmann, Laurie C
23Electron transport rate, relativerETRµmol e/m2/sHofmann, Laurie C
24PercentagePerc%Hofmann, Laurie Cbiomass
25SalinitySalHofmann, Laurie C
26Temperature, waterTemp°CHofmann, Laurie C
27Temperature, water, standard deviationTemp std dev±Hofmann, Laurie C
28pHpHHofmann, Laurie CPotentiometrictotal scale
29pH, standard deviationpH std dev±Hofmann, Laurie CPotentiometrictotal scale
30Alkalinity, totalATµmol/kgHofmann, Laurie CPotentiometric titration
31Alkalinity, total, standard deviationAT std dev±Hofmann, Laurie CPotentiometric titration
32Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHofmann, Laurie CCalculated using seacarb
33Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Hofmann, Laurie CCalculated using seacarb
34Carbon, inorganic, dissolvedDICµmol/kgHofmann, Laurie CCalculated using seacarb
35Carbon, inorganic, dissolved, standard deviationDIC std dev±Hofmann, Laurie CCalculated using seacarb
36Bicarbonate ion[HCO3]-µmol/kgHofmann, Laurie CCalculated using seacarb
37Bicarbonate ion, standard deviation[HCO3]- std dev±Hofmann, Laurie CCalculated using seacarb
38Carbonate ion[CO3]2-µmol/kgHofmann, Laurie CCalculated using seacarb
39Carbonate ion, standard deviation[CO3]2- std dev±Hofmann, Laurie CCalculated using seacarb
40Aragonite saturation stateOmega ArgHofmann, Laurie CCalculated using seacarb
41Aragonite saturation state, standard deviationOmega Arg std dev±Hofmann, Laurie CCalculated using seacarb
42Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
43Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
44Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
45Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
46Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
47Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
48Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
49Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
50Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
23003 data points

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