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Dupont, Sam; Moya, Aurélie; Bailly, Xavier (2012): Seawater carbonate chemistry, growth rate and hatching processes of Symsagittifera roscoffensis during experiments, 2012. PANGAEA, https://doi.org/10.1594/PANGAEA.774445, Supplement to: Dupont, S et al. (2012): Stable photosymbiotic relationship under CO2-induced acidification in the acoel worm Symsagittifera roscoffensis. PLoS ONE, 7(1), e29568, https://doi.org/10.1371/journal.pone.0029568

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Abstract:
As a consequence of anthropogenic CO2 emissions, oceans are becoming more acidic, a phenomenon known as ocean acidification. Many marine species predicted to be sensitive to this stressor are photosymbiotic, including corals and foraminifera. However, the direct impact of ocean acidification on the relationship between the photosynthetic and nonphotosynthetic organism remains unclear and is complicated by other physiological processes known to be sensitive to ocean acidification (e.g. calcification and feeding). We have studied the impact of extreme pH decrease/pCO2 increase on the complete life cycle of the photosymbiotic, non-calcifying and pure autotrophic acoel worm, Symsagittifera roscoffensis. Our results show that this species is resistant to high pCO2 with no negative or even positive effects on fitness (survival, growth, fertility) and/or photosymbiotic relationship till pCO2 up to 54 K µatm. Some sub-lethal bleaching is only observed at pCO2 up to 270 K µatm when seawater is saturated by CO2. This indicates that photosymbiosis can be resistant to high pCO2. If such a finding would be confirmed in other photosymbiotic species, we could then hypothesize that negative impact of high pCO2 observed on other photosymbiotic species such as corals and foraminifera could occur through indirect impacts at other levels (calcification, feeding).
Keyword(s):
Animalia; Benthic animals; Benthos; Bottles or small containers/Aquaria ( 20 L); Coast and continental shelf; Growth/Morphology; Laboratory experiment; North Atlantic; Reproduction; Single species; Symsagittifera roscoffensis; Temperate; Xenacoelomorpha
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).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Experimental treatmentExp treatDupont, Sam
2SalinitySalDupont, Sam
3Temperature, waterTemp°CDupont, Sam
4pHpHDupont, SampH meter (Metrohm, 826 pH mobile)Total scale
5Alkalinity, totalATµmol/kgDupont, SamMeasured
6Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmDupont, SamCalculated using SWCO2 (Hunter, 2007)
7Growth rateµmm/dayDupont, SamCalculated
8Symsagittifera roscoffensis, hatching timeS. roscoffensis hatching timedayDupont, Sam
9Symsagittifera roscoffensis, size at hatchingS. roscoffensis sizeµmDupont, Sam
10Symsagittifera roscoffensis, cocoon per femaleS. roscoffensis cocoons#Dupont, Sam
11Symsagittifera roscoffensis, cocoon per female per dayS. roscoffensis cocoons#/dayDupont, Sam
12Symsagittifera roscoffensis, eggs per femaleS. roscoffensis eggs#/dayDupont, Sam
13Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
15Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
16Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
17Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
18Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
19Carbon, inorganic, dissolvedDICµmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
20Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
21Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
Size:
252 data points

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