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Tarling, Geraint A; Peck, Victoria L; Ward, Peter; Ensor, N S; Achterberg, Eric Pieter; Tynan, Eithne; Poulton, Alex J; Mitchell, E; Zubkov, Mikhail V (2016): Effects of acute ocean acidification on spatially-diverse polar pelagic foodwebs:Insights from on-deck microcosms. PANGAEA,, Supplement to: Tarling, GA et al. (2016): Effects of acute ocean acidification on spatially-diverse polar pelagic foodwebs: Insights from on-deck microcosms. Deep Sea Research Part II: Topical Studies in Oceanography, 127, 75-92,

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The polar oceans are experiencing some of the largest levels of ocean acidification (OA) resulting from the uptake of anthropogenic carbon dioxide (CO2). Our understanding of the impacts this is having on polar marine communities is mainly derived from studies of single species in laboratory conditions, while the consequences for food web interactions remain largely unknown. This study carried out experimental manipulations of natural pelagic communities at different high latitude sites in both the northern (Nordic Seas) and southern hemispheres (Scotia and Weddell Seas). The aim of this study was to identify more generic responses and greater experimental reproducibility through implementing a series of short term (4 day), multilevel (3 treatment) carbonate chemistry manipulation experiments on unfiltered natural surface ocean communities, including grazing copepods. The experiments were successfully executed at six different sites, covering a diverse range of environmental conditions and differing plankton community compositions. The study identified the interaction between copepods and dinoflagellate cell abundance to be significantly altered by elevated levels of dissolved CO2 (pCO2), with dinoflagellates decreasing relative to ambient conditions across all six experiments. A similar pattern was not observed in any other major phytoplankton group. The patterns indicate that copepods show a stronger preference for dinoflagellates when in elevated pCO2 conditions, demonstrating that changes in food quality and altered grazing selectivity may be a major consequence of ocean acidification. The study also found that transparent exopolymeric particles (TEP) generally increased when pCO2 levels were elevated, but the response was dependent on the exact set of environmental conditions. Bacteria and nannoplankton showed a neutral response to elevated pCO2 and there was no significant relationship between changes in bacterial or nannoplankton abundance and that of TEP concentrations. Overall, the study illustrated that, although some similar responses exist, these contrasting high latitude surface ocean communities are likely to show different responses to the onset of elevated pCO2.
Antarctic; Arctic; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria ( 20 L); Coast and continental shelf; Community composition and diversity; Entire community; Laboratory experiment; Open ocean; Pelagos; Polar; Temperate
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise; Orr, James C; Gentili, Bernard; Proye, Aurélien; Soetaert, Karline; Rae, James (2016): seacarb: seawater carbonate chemistry with R. R package version 3.1.
Median Latitude: 28.806167 * Median Longitude: -4.513710 * South-bound Latitude: -58.087010 * West-bound Longitude: -36.623030 * North-bound Latitude: 78.280630 * East-bound Longitude: 26.002730
Date/Time Start: 2012-06-03T00:00:00 * Date/Time End: 2013-02-01T00:00:00
E01_271 * Latitude: 56.266640 * Longitude: 2.633190 * Date/Time: 2012-06-03T00:00:00 * Method/Device: Experiment (EXP)
E03_271 * Latitude: 76.175240 * Longitude: 2.549530 * Date/Time: 2012-06-13T00:00:00 * Method/Device: Experiment (EXP)
E03_274 * Latitude: -52.689300 * Longitude: -36.623030 * Date/Time: 2013-01-05T00:00:00 * Method/Device: Experiment (EXP)
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2016-11-30.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventTarling, Geraint A
2TypeTypeTarling, Geraint Astudy
3Station labelStationTarling, Geraint A
4TreatmentTreatTarling, Geraint A
5Time in hoursTimehTarling, Geraint A
6Carbon massCmgTarling, Geraint A
7Carbon mass, standard deviationC±Tarling, Geraint A
8Hydrogen contentHµgTarling, Geraint A
9Hydrogen, standard deviationH std dev±Tarling, Geraint A
10Nitrogen massNmgTarling, Geraint A
11Nitrogen, standard deviationN std dev±Tarling, Geraint A
12Carbon/Nitrogen ratioC/NTarling, Geraint A
13Carbon/Nitrogen ratio, standard deviationC/N std dev±Tarling, Geraint A
14Bottle numberBottleTarling, Geraint A
15TreatmentTreatTarling, Geraint Azooplankton introduced
16Temperature, waterTemp°CTarling, Geraint A
17SalinitySalTarling, Geraint A
18Nitrate and Nitrite[NO3]- + [NO2]-µmol/lTarling, Geraint A
19SilicateSi(OH)4µmol/lTarling, Geraint A
20Phosphate[PO4]3-µmol/lTarling, Geraint A
21Alkalinity, totalATµmol/kgTarling, Geraint A
22Carbon, inorganic, dissolvedDICµmol/kgTarling, Geraint A
23Ammonium[NH4]+µmol/lTarling, Geraint A
24Transparent exopolymer particles as Gum Xanthan equivalents per volumeTEPµg Xeq/lTarling, Geraint A
25DiatomsDiatoms#/lTarling, Geraint Atotal
26DinoflagellatesDinofl#/mlTarling, Geraint Atotal
27CiliatesCiliates#/lTarling, Geraint Atotal
28FlagellatesFlag#/lTarling, Geraint Atotal
29Nanoflagellates, heterotrophicHNF#/mlTarling, Geraint A
30Nanoflagellates, phototrophicPNF#/mlTarling, Geraint Avery Large size (possibly Phaeocystis)
31Nanoflagellates, phototrophicPNF#/mlTarling, Geraint ACocolithophores
32Nanoflagellates, phototrophicPNF#/mlTarling, Geraint Asmall size cells
33Nanoflagellates, phototrophicPNF#/mlTarling, Geraint Amedium size cells
34Nanoflagellates, phototrophicPNF#/mlTarling, Geraint Alarge size cells
35Nanoflagellates, phototrophicPNF#/mlTarling, Geraint Atotal
36BacteriaBact#/mlTarling, Geraint Atotal
37Bacteria, low DNA fluorescenceBact LDNA#/mlTarling, Geraint A
38Bacteria, high DNA fluorescenceBact HDNA#/mlTarling, Geraint A
39NanoflagellatesNanofl#/lTarling, Geraint Atotal
40Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
41pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
42Carbon dioxideCO2µmol/kgYang, 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)
44Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
45Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
46Carbonate ion[CO3]2-µmol/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)
4975 data points

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