Data Description

Citation:
Comeau, Steeve; Jeffree, Ross; Teyssié, Jean-Louis; Gattuso, Jean-Pierre (2009): Seawater carbonate chemistry and biological processes during experiments with Limacina helicina, 2009. doi:10.1594/PANGAEA.744720,
In: EPOCA Arctic experiment 2009 team (2009): EPOCA 2009 Svalbard benthic experiment. doi:10.1594/PANGAEA.745083
Abstract:
Thecosome pteropods (pelagic mollusks) can play a key role in the food web of various marine ecosystems. They are a food source for zooplankton or higher predators such as fishes, whales and birds that is particularly important in high latitude areas. Since they harbor a highly soluble aragonitic shell, they could be very sensitive to ocean acidification driven by the increase of anthropogenic CO2 emissions. The effect of changes in the seawater chemistry was investigated on Limacina helicina, a key species of Arctic pelagic ecosystems. Individuals were kept in the laboratory under controlled pCO2 levels of 280, 380, 550, 760 and 1020 µatm and at control (0°C) and elevated (4°C) temperatures. The respiration rate was unaffected by pCO2 at control temperature, but significantly increased as a function of the pCO2 level at elevated temperature. pCO2 had no effect on the gut clearance rate at either temperature. Precipitation of CaCO3, measured as the incorporation of 45Ca, significantly declined as a function of pCO2 at both temperatures. The decrease in calcium carbonate precipitation was highly correlated to the aragonite saturation state. Even though this study demonstrates that pteropods are able to precipitate calcium carbonate at low aragonite saturation state, the results support the current concern for the future of Arctic pteropods, as the production of their shell appears to be very sensitive to decreased pH. A decline of pteropod populations would likely cause dramatic changes to various pelagic ecosystems.
Related to:
Comeau, Steeve; Jeffree, Ross; Teyssié, Jean-Louis; Gattuso, Jean-Pierre (2010): Response of the Arctic pteropod Limacina helicina to projected future environmental conditions. PLoS ONE, 5(6), e11362, doi:10.1371/journal.pone.0011362 *
Project(s):
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
1Identification *IDComeau, Steeve *
2Salinity *SalComeau, Steeve *
3Temperature, water *Temp°CComeau, Steeve *
4Experimental treatment *Exp trtmComeau, Steeve *CT- control temperature, HT- high temperature
5Species *SpeciesComeau, Steeve *
6pH *pHComeau, Steeve *pH meter (Metrohm, 826 pH mobile) *Total scale
7Alkalinity, total *ATµmol/kgComeau, Steeve *Alkalinity, Gran titration (Gran, 1950) *
8Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
9Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
10Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
11Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
12Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
13Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
14Total carbon *TCµmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
15Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
16Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
17Gut clearance coefficient *k#/hComeau, Steeve *Spectro-fluorometry using a Turner-Designs Fluorometer; after Lorenzen, 1967 *
18Respiration rate, oxygen *Resp O2µmol/mg/hComeau, Steeve *Titration, Winkler *
19Respiration rate, oxygen, standard deviation *Resp O2 std dev±Comeau, Steeve *Calculated *
20Calcium carbonate passive adsorption *CaCO3 adsµmol/g/hComeau, Steeve *
21Calcium carbonate passive adsorption, standard deviation *CaCO3 ads std dev±Comeau, Steeve *
22Calcium carbonate precipitated *CaCO3 precµmol/g/hComeau, Steeve *
23Calcium carbonate precipitated, standard deviation *CaCO3 prec std dev±Comeau, Steeve *
License:
Size:
390 data points

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