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Barkley, Hannah C; Cohen, Anne L; Golbuu, Yimnang; Starczak, V R; DeCarlo, Thomas M; Shamberger, K E F (2015): Changes in coral reef communities across a natural gradient in seawater pH. PANGAEA, https://doi.org/10.1594/PANGAEA.849300, Supplement to: Barkley, HC et al. (2015): Changes in coral reef communities across a natural gradient in seawater pH. Science Advances, 1(5), e1500328-e1500328, https://doi.org/10.1126/sciadv.1500328

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Abstract:
Ocean acidification threatens the survival of coral reef ecosystems worldwide. The negative effects of ocean acidification observed in many laboratory experiments have been seen in studies of naturally low-pH reefs, with little evidence to date for adaptation. Recently, we reported initial data suggesting that low-pH coral communities of the Palau Rock Islands appear healthy despite the extreme conditions in which they live. Here, we build on that observation with a comprehensive statistical analysis of benthic communities across Palau's natural acidification gradient. Our analysis revealed a shift in coral community composition but no impact of acidification on coral richness, coralline algae abundance, macroalgae cover, coral calcification, or skeletal density. However, coral bioerosion increased 11-fold as pH decreased from the barrier reefs to the Rock Island bays. Indeed, a comparison of the naturally low-pH coral reef systems studied so far revealed increased bioerosion to be the only consistent feature among them, as responses varied across other indices of ecosystem health. Our results imply that whereas community responses may vary, escalation of coral reef bioerosion and acceleration of a shift from net accreting to net eroding reef structures will likely be a global signature of ocean acidification.
Keyword(s):
Benthos; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Coast and continental shelf; Community composition and diversity; Entire community; Field observation; Rocky-shore community; South Pacific; Tropical
Related to:
Cohen, Anne L; Karnauskas, Kristopher (2015): Dataset: coral skeletal growth. Biological and Chemical Oceanography Data Management Office, http://www.bco-dmo.org/dataset/561046
Cohen, Anne L; Karnauskas, Kristopher; McCorkle, Daniel C; Tarrant, Ann M; de Putron, Samantha J (2015): Dataset: coral diversity and richness. Biological and Chemical Oceanography Data Management Office, http://www.bco-dmo.org/dataset/520476
Cohen, Anne L; Karnauskas, Kristopher; McCorkle, Daniel C; Tarrant, Ann M; de Putron, Samantha J (2015): Dataset: Palau carbonate chemistry. Biological and Chemical Oceanography Data Management Office, http://www.bco-dmo.org/dataset/489014
Further details:
Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloise (2015): seacarb: seawater carbonate chemistry with R. R package version 3.0.8. https://cran.r-project.org/package=seacarb
Coverage:
Median Latitude: 7.338125 * Median Longitude: 134.462750 * South-bound Latitude: 7.160000 * West-bound Longitude: 134.352000 * North-bound Latitude: 7.544000 * East-bound Longitude: 134.557000
Date/Time Start: 2011-09-19T00:00:00 * Date/Time End: 2013-11-15T00:00:00
Event(s):
Palau * Latitude: 7.338000 * Longitude: 134.463000 * Date/Time Start: 2011-09-19T00:00:00 * Date/Time End: 2013-11-15T00:00:00 * Device: Experiment (EXP)
Comment:
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2015) 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 2015-09-09.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1SiteSiteBarkley, Hannah C
2LATITUDELatitudeBarkley, Hannah CGeocode
3LONGITUDELongitudeBarkley, Hannah CGeocode
4Aragonite saturation stateOmega ArgBarkley, Hannah C
5Aragonite saturation state, standard errorOmega Arg std e±Barkley, Hannah C
6Corals, coverCorals cov%Barkley, Hannah C
7Corals, cover, standard errorCorals cov std e±Barkley, Hannah C
8Species richnessSBarkley, Hannah Ccoral genera
9Species richness, standard errorS std e±Barkley, Hannah Ccoral genera
10DiversityH(S)Barkley, Hannah Ccoral genera
11Diversity, standard errorH(S) std e±Barkley, Hannah Ccoral genera
12Evenness of speciesEBarkley, Hannah Ccoral genera
13Evenness of species, standard errorE std e±Barkley, Hannah Ccoral genera
14CoverageCov%Barkley, Hannah CPorites coral
15Coverage, standard errorCov std e±Barkley, Hannah CPorites coral
16CoverageCov%Barkley, Hannah Cacropora coral
17Coverage, standard errorCov std e±Barkley, Hannah Cacropora coral
18CoverageCov%Barkley, Hannah Cmacroalgae
19Coverage, standard errorCov std e±Barkley, Hannah Cmacroalgae
20CoverageCov%Barkley, Hannah CCrustose coralline algae (CCA)
21Coverage, standard errorCov std e±Barkley, Hannah CCrustose coralline algae (CCA)
22Extension rateExtensionmm/aBarkley, Hannah CPorites
23Extension rate, standard errorExtension std e±Barkley, Hannah CPorites
24DensityDensityg/cm3Barkley, Hannah CPorites
25Density, standard errorDensity std e±Barkley, Hannah CPorites
26Calcification rate of calcium carbonateCalc rate CaCO3g/cm2/aBarkley, Hannah CPorites
27Calcification rate, standard errorCalc rate std e±Barkley, Hannah CPorites
28Extension rateExtensionmm/aBarkley, Hannah CFavia
29Extension rate, standard errorExtension std e±Barkley, Hannah CFavia
30DensityDensityg/cm3Barkley, Hannah CFavia
31Density, standard errorDensity std e±Barkley, Hannah CFavia
32Calcification rate of calcium carbonateCalc rate CaCO3g/cm2/aBarkley, Hannah CFavia
33Calcification rate, standard errorCalc rate std e±Barkley, Hannah CFavia
34PercentagePerc%Barkley, Hannah Caverage Porites percent volume bioeroded.
35Percentage, standard errorPerc std e±Barkley, Hannah Caverage Porites percent volume bioeroded.
36Temperature, waterTemp°CBarkley, Hannah C
37Temperature, water, standard errorT std e±Barkley, Hannah C
38SalinitySalBarkley, Hannah C
39Salinity, standard errorSal std e±Barkley, Hannah C
40Nitrate and Nitrite[NO3]- + [NO2]-µmol/lBarkley, Hannah C
41Nitrate and Nitrite, standard error[NO3]- + [NO2]- std e±Barkley, Hannah C
42Ammonium[NH4]+µmol/lBarkley, Hannah C
43Ammonium, standard error[NH4]+ std e±Barkley, Hannah C
44Phosphate[PO4]3-µmol/lBarkley, Hannah C
45Phosphate, standard errorPO4 std e±Barkley, Hannah C
46Alkalinity, totalATµmol/kgBarkley, Hannah CPotentiometric titration
47Alkalinity, total, standard errorAT std e±Barkley, Hannah CPotentiometric titration
48Carbon, inorganic, dissolvedDICµmol/kgBarkley, Hannah CCoulometric titration
49Carbon, inorganic, dissolved, standard errorDIC std e±Barkley, Hannah CCoulometric titration
50Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmBarkley, Hannah CCalculated using CO2SYS
51Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard errorpCO2water_SST_wet std e±Barkley, Hannah CCalculated using CO2SYS
52Carbonate ion[CO3]2-µmol/kgBarkley, Hannah CCalculated using CO2SYS
53Carbonate ion, standard error[CO3]2- std e±Barkley, Hannah CCalculated using CO2SYS
54pHpHBarkley, Hannah CCalculated using CO2SYStotal scale
55pH, standard errorpH std e±Barkley, Hannah CCalculated using CO2SYStotal scale
56Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
57pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
58Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
59Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
60Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
61Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
62Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
63Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
64Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
Size:
728 data points

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