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Hofmann, Laurie C (2012): Experiment: Competition between calcifying and noncalcifying temperate marine macroalgae under elevated CO2 levels. PANGAEA,, Supplement to: Hofmann, Laurie C; Straub, Susanne M; Bischof, Kai (2012): Competition between calcifying and noncalcifying temperate marine macroalgae under elevated CO2 levels. Marine Ecology Progress Series, 464, 89-105,

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Since pre-industrial times, uptake of anthropogenic CO2 by surface ocean waters has caused a documented change of 0.1 pH units. Calcifying organisms are sensitive to elevated CO2 concentrations due to their calcium carbonate skeletons. In temperate rocky intertidal environments, calcifying and noncalcifying macroalgae make up diverse benthic photoautotrophic communities. These communities may change as calcifiers and noncalcifiers respond differently to rising CO2 concentrations. In order to test this hypothesis, we conducted an 86 d mesocosm experiment to investigate the physiological and competitive responses of calcifying and noncalcifying temperate marine macroalgae to 385, 665, and 1486 µatm CO2. We focused on comparing 2 abundant red algae in the Northeast Atlantic: Corallina officinalis (calcifying) and Chondrus crispus (noncalcifying). We found an interactive effect of CO2 concentration and exposure time on growth rates of C. officinalis, and total protein and carbohydrate concentrations in both species. Photosynthetic rates did not show a strong response. Calcification in C. officinalis showed a parabolic response, while skeletal inorganic carbon decreased with increasing CO2. Community structure changed, as Chondrus crispus cover increased in all treatments, while C. officinalis cover decreased in both elevated-CO2 treatments. Photochemical parameters of other species are also presented. Our results suggest that CO2 will alter the competitive strengths of calcifying and noncalcifying temperate benthic macroalgae, resulting in different community structures, unless these species are able to adapt at a rate similar to or faster than the current rate of increasing sea-surface CO2 concentrations.
Benthos; Chondrus crispus; Coast and continental shelf; Community composition and diversity; Containers and aquaria (20-1000 L or < 1 m**2); Corallina officinalis; Derbesia marina; Dumontia incrassata; Entire community; Fucus vesiculosus; Growth/Morphology; Laboratory experiment; North Atlantic; Petalonia sp.; Polysiphonia fucoides; Primary production/Photosynthesis; Respiration; Rocky-shore community; Sargassum muticum; Spongomorpha; Temperate; Ulva Compress; Ulva linza
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4.
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 2014-02-11.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1SpeciesSpeciesHofmann, Laurie C
2TreatmentTreatHofmann, Laurie C
3Sample IDSample IDHofmann, Laurie C
4Incubation durationInc durdaysHofmann, Laurie C
5Light saturationEkµmol/m2/sHofmann, Laurie C
6Maximal electron transport rate, relativerETR maxHofmann, Laurie C
7Electron transport rate efficiencyalphaHofmann, Laurie C
8Maximum photochemical quantum yield of photosystem IIFv/FmHofmann, Laurie C
9IrradianceEµmol/m2/sHofmann, Laurie C
10YieldYield%Hofmann, Laurie C
11Electron transport rate, relativerETRµmol e/m2/sHofmann, Laurie C
12GroupGroupHofmann, Laurie C
13CoverageCov%Hofmann, Laurie C
14Simpson index of diversitySimpson IHofmann, Laurie C
15Shannon Diversity IndexH'Hofmann, Laurie C
16Gross oxygen evolution, per chlorophyll aO2 ev/Chlµmol/mg/hHofmann, Laurie C
17Growth rateµ%/dayHofmann, Laurie C
18Carbohydrates, solube, in tissueCHO solmg/gHofmann, Laurie C
19Carbohydrates, insolube, in tissueCHO insolmg/gHofmann, Laurie C
20Proteins, in tissuePTRmg/gHofmann, Laurie C
21Carbohydrates, totalCHO totµg/gHofmann, Laurie C
22Proteins/Carbohydrate ratioPTR/CHOHofmann, Laurie C
23Carbohydrates, insolube/Carbohydrates, solube ratioCHO insol/CHO solHofmann, Laurie C
24Carbohydrates, solubeCHO sol%Hofmann, Laurie C
25Carbohydrates, insolubeCHO insol%Hofmann, Laurie C
26ProteinProtein%Hofmann, Laurie C
27PhycoerythrinPhycoerythµg/gHofmann, Laurie C
28PhycocyaninPhycocµg/gHofmann, Laurie C
29Chlorophyll aChl aµg/gHofmann, Laurie C
30Chlorophyll bChl bµg/gHofmann, Laurie C
31Respiration rate, oxygenResp O2µmol/mg/hHofmann, Laurie C
32Respiration rate, oxygenResp O2µmol/mg/hHofmann, Laurie CLight Adapted
33SalinitySalHofmann, Laurie C
34Temperature, waterTemp°CHofmann, Laurie C
35Alkalinity, totalATµmol/kgHofmann, Laurie C
36pHpHHofmann, Laurie CNBS scale
37PhosphatePHSPHTµmol/kgHofmann, Laurie C
38SilicateSILCATµmol/kgHofmann, Laurie C
39Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
40pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
41Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
42Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
43Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
44Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
45Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
46Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
47Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
48Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
63689 data points

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