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Niehoff, Barbara; Schmithüsen, Tosia; Knüppel, Nadine; Daase, M; Czerny, Jan; Boxhammer, Tim (2013): Mesozooplankton community development at elevated CO2. PANGAEA,, Supplement to: Niehoff, Barbara; Schmithüsen, Holger; Knüppel, Nadine; Daase, M; Czerny, Jan; Boxhammer, Tim (2013): Mesozooplankton community development at elevated CO2 concentrations: results from a mesocosm experiment in an Arctic fjord. Biogeosciences, 10(3), 1391-1406,

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The increasing CO2 concentration in the atmosphere caused by burning fossil fuels leads to increasing pCO2 and decreasing pH in the world ocean. These changes may have severe consequences for marine biota, especially in cold-water ecosystems due to higher solubility of CO2. However, studies on the response of mesozooplankton communities to elevated CO2 are still lacking. In order to test whether abundance and taxonomic composition change with pCO2, we have sampled nine mesocosms, which were deployed in Kongsfjorden, an Arctic fjord at Svalbard, and were adjusted to eight CO2 concentrations, initially ranging from 185 µatm to 1420 µatm. Vertical net hauls were taken weekly over about one month with an Apstein net (55 µm mesh size) in all mesocosms and the surrounding fjord. In addition, sediment trap samples, taken every second day in the mesocosms, were analysed to account for losses due to vertical migration and mortality. The taxonomic analysis revealed that meroplanktonic larvae (Cirripedia, Polychaeta, Bivalvia, Gastropoda, and Decapoda) dominated in the mesocosms while copepods (Calanus spp., Oithona similis, Acartia longiremis and Microsetella norvegica) were found in lower abundances. In the fjord copepods prevailed for most of our study. With time, abundance and taxonomic composition developed similarly in all mesocosms and the pCO2 had no significant effect on the overall community structure. Also, we did not find significant relationships between the pCO2 level and the abundance of single taxa. Changes in heterogeneous communities are, however, difficult to detect, and the exposure to elevated pCO2 was relatively short. We therefore suggest that future mesocosm experiments should be run for longer periods.
Arctic; Biomass/Abundance/Elemental composition; Coast and continental shelf; Entire community; Field experiment; Mesocosm or benthocosm; Pelagos; Polar
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4.
Latitude: 79.005000 * Longitude: 11.669000
Date/Time Start: 2010-06-05T00:00:00 * Date/Time End: 2010-07-07T00:00:00
Kongsfjorden * Latitude: 79.005000 * Longitude: 11.669000 * Location: Kongsfjorden, Spitsbergen, Arctic * Method/Device: Biological sample (BIOS)
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).
Info on data: Data for water column are presented as number of individuals m-3, Data for sediment traps are presented as number of individuals collected in the sediment traps over 48 hrs
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Location typeLoc typeNiehoff, Barbara
2DATE/TIMEDate/TimeNiehoff, BarbaraGeocode
3Experiment dayExp daydayNiehoff, Barbara
4Sample code/labelSample labelNiehoff, Barbara
5Carbon dioxide, partial pressurepCO2µatmNiehoff, Barbarainitial CO2 concentration
6Cirripedia, naupliiCirripedia naup#/m3Niehoff, Barbara
7Cirripedia, cyprisCirripedia cypris#/m3Niehoff, Barbara
8EuphausiidaeEuphausiidae#/m3Niehoff, Barbara
9BivalviaBivalvia#/m3Niehoff, Barbara
10GastropodaGastrop#/m3Niehoff, Barbara
11PolychaetaPolychaeta#/m3Niehoff, Barbara
12CopepodaCopepoda#/m3Niehoff, Barbara
13Calanus spp., c1Calanus spp. c1#/m3Niehoff, Barbara
14Calanus spp., c2Calanus spp. c2#/m3Niehoff, Barbara
15Calanus spp., c3Calanus spp. c3#/m3Niehoff, Barbara
16Calanus spp., c4Calanus spp. c4#/m3Niehoff, Barbara
17Calanus spp., c5Calanus spp. c5#/m3Niehoff, Barbara
18Calanus sp., femaleCalanus sp. f#/m3Niehoff, Barbara
19Oithona similisO. similis#/m3Niehoff, Barbaraall copepodite stages
20Acartia longiremisA. longiremis#/m3Niehoff, Barbaraall copepodite stages
21Microsetella norvegicaM. norvegica#/m3Niehoff, Barbaraall copepodite stages
22SalinitySalNiehoff, Barbara
23Temperature, waterTemp°CNiehoff, Barbara
24Alkalinity, totalATµmol/kgNiehoff, Barbara
25Carbon, inorganic, dissolvedDICµmol/kgNiehoff, Barbara
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)
29Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
30Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_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)
6544 data points

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