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Johnson, Vivienne R; Russell, Bayden D; Fabricius, Katharina Elisabeth; Brownlee, Colin; Hall-Spencer, Jason M (2012): Seawater carbonate chemistry and calcium carbonate of Padina spp., photosynthesis of Padina pavonica in nature CO2 gradients experiment. doi:10.1594/PANGAEA.823111, Supplement to: Johnson, VR et al. (2012): Temperate and tropical brown macroalgae thrive, despite decalcification, along natural CO2 gradients. Global Change Biology, 18(9), 2792-2803, doi:10.1111/j.1365-2486.2012.02716.x

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Abstract:
Predicting the impacts of ocean acidification on coastal ecosystems requires an understanding of the effects on macroalgae and their grazers, as these underpin the ecology of rocky shores. Whilst calcified coralline algae (Rhodophyta) appear to be especially vulnerable to ocean acidification, there is a lack of information concerning calcified brown algae (Phaeophyta), which are not obligate calcifiers but are still important producers of calcium carbonate and organic matter in shallow coastal waters. Here, we compare ecological shifts in subtidal rocky shore systems along CO2 gradients created by volcanic seeps in the Mediterranean and Papua New Guinea, focussing on abundant macroalgae and grazing sea urchins. In both the temperate and tropical systems the abundances of grazing sea urchins declined dramatically along CO2 gradients. Temperate and tropical species of the calcifying macroalgal genus Padina (Dictyoaceae, Phaeophyta) showed reductions in CaCO3 content with CO2 enrichment. In contrast to other studies of calcified macroalgae, however, we observed an increase in the abundance of Padina spp. in acidified conditions. Reduced sea urchin grazing pressure and significant increases in photosynthetic rates may explain the unexpected success of decalcified Padina spp. at elevated levels of CO2. This is the first study to provide a comparison of ecological changes along CO2 gradients between temperate and tropical rocky shores. The similarities we found in the responses of Padina spp. and sea urchin abundance at several vent systems increases confidence in predictions of the ecological impacts of ocean acidification over a large geographical range.
Further details:
Lavigne, Héloise; Gattuso, Jean-Pierre (2011): seacarb: seawater carbonate chemistry with R. R package version 2.4. https://cran.r-project.org/package=seacarb
Coverage:
Median Latitude: 14.333335 * Median Longitude: 82.891665 * South-bound Latitude: -9.750000 * West-bound Longitude: 14.950000 * North-bound Latitude: 38.416670 * East-bound Longitude: 150.833330
Date/Time Start: 2010-09-01T00:00:00 * Date/Time End: 2011-05-31T00:00:00
Event(s):
Aeolian_Island_Vulcano * Latitude: 38.416670 * Longitude: 14.950000 * Date/Time Start: 2010-09-01T00:00:00 * Date/Time End: 2011-05-31T00:00:00 * Device: In situ sampler (ISS)
Papua_New_Guinea * Latitude: -9.750000 * Longitude: 150.833330 * Date/Time Start: 2011-04-01T00:00:00 * Date/Time End: 2011-04-30T00:00:00 * Device: In situ sampler (ISS)
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). The date of carbonate chemistry calculation by seacarb is 2013-11-20.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event labelEvent
2IdentificationIDJohnson, Vivienne R
3SpeciesSpeciesJohnson, Vivienne R
4ReplicateReplicateJohnson, Vivienne R
5Station labelStationJohnson, Vivienne R
6CoverageCov%Johnson, Vivienne R
7Calcium carbonateCaCO3%Johnson, Vivienne R
8Maximum photochemical quantum yield of photosystem IIFv/FmJohnson, Vivienne R
9Maximal electron transport rate, relativerETR maxµmol e/m2/sJohnson, Vivienne R
10Electron transport rate, relativerETRµmol e/m2/sJohnson, Vivienne Rat supersaturating irradiance
11Electron transport rate, relativerETRµmol e/m2/sJohnson, Vivienne Rat subsaturating irradiance
12Chlorophyll aChl aµg/gJohnson, Vivienne R
13Chlorophyll c per cellChl cpg/#Johnson, Vivienne R
14LengthlµmJohnson, Vivienne R
15WidthwµmJohnson, Vivienne R
16AbundanceAbundJohnson, Vivienne Rnumber of crustals per 5um*5um area
17pHpHJohnson, Vivienne RPotentiometricNBS scale, median value
18Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmJohnson, Vivienne RCalculated using CO2SYSmedian value
19Alkalinity, totalATµmol/kgJohnson, Vivienne RPotentiometric titration
20Alkalinity, total, standard deviationAT std dev±Johnson, Vivienne R
21Carbon, inorganic, dissolvedDICµmol/kgJohnson, Vivienne RCalculated using CO2SYSmedian value
22Carbonate ion[CO3]2-µmol/kgJohnson, Vivienne RCalculated using CO2SYSmedian value
23Bicarbonate ion[HCO3]-µmol/kgJohnson, Vivienne RCalculated using CO2SYSmedian value
24Calcite saturation stateOmega CalJohnson, Vivienne RCalculated using CO2SYSmedian value
25Aragonite saturation stateOmega ArgJohnson, Vivienne RCalculated using CO2SYSmedian value
26Temperature, waterTemp°CJohnson, Vivienne R
27SalinitySalJohnson, Vivienne R
28Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
29pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
30Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
31Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
32Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
33Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
34Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
35Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
36Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
37Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
28736 data points

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