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Apostolaki, Eugenia; Vizzini, Salvatrice; Hendriks, Iris; Olsen, Ylva (2014): Seagrass ecosystem response to long-term high CO2 in a Mediterranean volcanic vent. PANGAEA,, Supplement to: Apostolaki, E et al. (2014): Seagrass ecosystem response to long-term high CO2 in a Mediterranean volcanic vent. Marine Environmental Research, 99, 9-15,

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We examined the long-term effect of naturally acidified water on a Cymodocea nodosa meadow growing at a shallow volcanic CO2 vent in Vulcano Island (Italy). Seagrass and adjacent unvegetated habitats growing at a low pH station (pH = 7.65 ± 0.02) were compared with corresponding habitats at a control station (pH = 8.01 ± 0.01). Density and biomass showed a clear decreasing trend at the low pH station and the below- to above-ground biomass ratio was more than 10 times lower compared to the control. C content and delta 13C of leaves and epiphytes were significantly lower at the low pH station. Photosynthetic activity of C. nodosa was stimulated by low pH as seen by the significant increase in Chla content of leaves, maximum electron transport rate and compensation irradiance. Seagrass community metabolism was intense at the low pH station, with significantly higher net community production, respiration and gross primary production than the control community, whereas metabolism of the unvegetated community did not differ between stations. Productivity was promoted by the low pH, but this was not translated into biomass, probably due to nutrient limitation, grazing or poor environmental conditions. The results indicate that seagrass response in naturally acidified conditions is dependable upon species and geochemical characteristics of the site and highlight the need for a better understanding of complex interactions in these environments.
Benthos; Biomass/Abundance/Elemental composition; CO2 vent; Coast and continental shelf; Cymodocea nodosa; Entire community; Field observation; Mediterranean Sea; Primary production/Photosynthesis; Respiration; Soft-bottom community; Temperate
Further details:
Lavigne, Héloise; Epitalon, Jean-Marie; Gattuso, Jean-Pierre (2014): seacarb: seawater carbonate chemistry with R. R package version 3.0.
In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) 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 2014-07-07.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1SpeciesSpeciesApostolaki, Eugenia
2GroupGroupApostolaki, Eugenia
3TreatmentTreatApostolaki, Eugenia
4Shoot densityShoot den#/m2Apostolaki, Eugenia
5Shoot density, standard errorShoot den std e±Apostolaki, Eugenia
6BiomassBiomg/m2Apostolaki, Eugeniaabove ground
7Biomass, standard errorBiom std e±Apostolaki, Eugeniaabove ground
8BiomassBiomg/m2Apostolaki, Eugeniabelow ground
9Biomass, standard errorBiom std e±Apostolaki, Eugeniabelow ground
10CarbonC%Apostolaki, Eugeniaper dry weight
11Carbon, standard errorC std e±Apostolaki, Eugeniaper dry weight
12δ13Cδ13C‰ PDBApostolaki, Eugenia
13δ13C, standard errorδ13C std e±Apostolaki, Eugenia
14Chlorophyll aChl aµg/gApostolaki, Eugenia
15Chlorophyll a, standard errorChl a std e±Apostolaki, Eugenia
16Epiphytes loadEpiphytes loadg/gApostolaki, Eugeniaper dry weight leaf
17Epiphytes load, standard errorEpiphytes load std e±Apostolaki, Eugeniaper dry weight leaf
18Calcium carbonateCaCO3%Apostolaki, Eugeniaper dry weight
19Calcium carbonate, standard errorCaCO3 std e±Apostolaki, Eugeniaper dry weight
20Maximum photochemical quantum yield of photosystem IIFv/FmApostolaki, Eugenia
21Maximum photochemical quantum yield of photosystem II, standard errorFv/Fm std e±Apostolaki, Eugenia
22Electron transport rateETRµmol e/m2/sApostolaki, Eugeniamax
23Electron transport rate, standard errorETR std e±Apostolaki, Eugeniamax
24Light saturation pointIkApostolaki, Eugenia
25Light saturation point, standard errorIk std e±Apostolaki, Eugenia
26Photosynthetic quantum efficiencyalphaApostolaki, Eugenia
27Photosynthetic quantum efficiency, standard erroralpha std e±Apostolaki, Eugenia
28IrradianceEµmol/m2/sApostolaki, Eugeniaoptimum
29Irradiance, standard errorE std e±Apostolaki, Eugeniaoptimum
30Net community production of carbonNCP Cmmol/m2/dayApostolaki, Eugenia
31Net community production of carbon, standard errorNCP std e±Apostolaki, Eugenia
32Respiration rate, carbonResp Cmmol/m2/dayApostolaki, Eugenia
33Respiration rate, carbon, standard errorResp C std e±Apostolaki, Eugenia
34Gross primary production of carbonGPP Cmmol/m2/dayApostolaki, Eugenia
35Gross primary production of carbon, standard errorGPP C std e±Apostolaki, Eugenia
36IlluminanceE vlxApostolaki, Eugenia
37Illuminance, standard errorE v std e±Apostolaki, Eugenia
38SalinitySalApostolaki, Eugenia
39Temperature, waterTemp°CApostolaki, Eugenia
40Temperature, water, standard errorT std e±Apostolaki, Eugenia
41pHpHApostolaki, EugeniaPotentiometric
42pH, standard errorpH std e±Apostolaki, EugeniaPotentiometric
43OxygenO2µmol/lApostolaki, Eugenia
44Oxygen, standard errorO2 std e±Apostolaki, Eugenia
45Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmApostolaki, Eugenia
46Partial pressure of carbon dioxide (water) at sea surface temperature (wet air), standard errorpCO2water_SST_wet std e±Apostolaki, Eugenia
47Carbon, inorganic, dissolvedDICµmol/kgApostolaki, Eugenia
48Carbon, inorganic, dissolved, standard errorDIC std e±Apostolaki, Eugenia
49Alkalinity, totalATµmol/kgApostolaki, EugeniaPotentiometric titration
50Alkalinity, total, standard errorAT std e±Apostolaki, EugeniaPotentiometric titration
51Carbonate system computation flagCSC flagYang, YanCalculated using seacarb after Nisumaa et al. (2010)
52pHpHYang, YanCalculated using seacarb after Nisumaa et al. (2010)total scale
53Carbon dioxideCO2µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
54Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
55Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmYang, YanCalculated using seacarb after Nisumaa et al. (2010)
56Bicarbonate ion[HCO3]-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
57Carbonate ion[CO3]2-µmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
58Carbon, inorganic, dissolvedDICµmol/kgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
59Aragonite saturation stateOmega ArgYang, YanCalculated using seacarb after Nisumaa et al. (2010)
60Calcite saturation stateOmega CalYang, YanCalculated using seacarb after Nisumaa et al. (2010)
300 data points

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