Calcareous green alga Halimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2015
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| _version_ | 1867170057887416320 |
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| author | Vogel, Nikolas Fabricius, Katharina Elisabeth Strahl, Julia Noonan, Sam Wild, Christian Uthicke, Sven |
| author_facet | Vogel, Nikolas Fabricius, Katharina Elisabeth Strahl, Julia Noonan, Sam Wild, Christian Uthicke, Sven |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | We investigated ecological, physiological, and skeletal characteristics of the calcifying green alga Halimeda grown at CO2 seeps (pHtotal ~ 7.8) and compared them to those at control reefs with ambient CO2 conditions (pHtotal ~ 8.1). Six species of Halimeda were recorded at both the high CO2 and control sites. For the two most abundant species Halimeda digitata and Halimeda opuntia we determined in situ light and dark oxygen fluxes and calcification rates, carbon contents and stable isotope signatures. In both species, rates of calcification in the light increased at the high CO2 site compared to controls (131% and 41%, respectively). In the dark, calcification was not affected by elevated CO2 in H. digitata, whereas it was reduced by 167% in H. opuntia, suggesting nocturnal decalcification. Calculated net calcification of both species was similar between seep and control sites, i.e., the observed increased calcification in light compensated for reduced dark calcification. However, inorganic carbon content increased (22%) in H. digitata and decreased (-8%) in H. opuntia at the seep site compared to controls. Significantly, lighter carbon isotope signatures of H. digitata and H. opuntia phylloids at high CO2 (1.01 per mil [parts per thousand] and 1.94 per mil, respectively) indicate increased photosynthetic uptake of CO2 over HCO3- potentially reducing dissolved inorganic carbon limitation at the seep site. Moreover, H. digitata and H. opuntia specimens transplanted for 14 d from the control to the seep site exhibited similar delta13C signatures as specimens grown there. These results suggest that the Halimeda spp. investigated can acclimatize and will likely still be capable to grow and calcify in inline image conditions exceeding most pessimistic future CO2 projections. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_846875 |
| institution | PANGAEA |
| language | en |
| publishDate | 2015 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Calcareous green alga Halimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps Vogel, Nikolas Fabricius, Katharina Elisabeth Strahl, Julia Noonan, Sam Wild, Christian Uthicke, Sven Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, inorganic, total; Carbon, organic, total; Carbon, organic total/Carbon, inorganic total; Carbon, total; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyta; CO2 vent; Coast and continental shelf; EXP; Experiment; Field experiment; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Halimeda digitata; Halimeda opuntia; Light; Macroalgae; Net photosynthesis rate, oxygen; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Papua_New_Guinea_OA; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Plantae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; Site; South Pacific; Species; Temperature, water; Temperature, water, standard deviation; Treatment; Tropical; δ13C We investigated ecological, physiological, and skeletal characteristics of the calcifying green alga Halimeda grown at CO2 seeps (pHtotal ~ 7.8) and compared them to those at control reefs with ambient CO2 conditions (pHtotal ~ 8.1). Six species of Halimeda were recorded at both the high CO2 and control sites. For the two most abundant species Halimeda digitata and Halimeda opuntia we determined in situ light and dark oxygen fluxes and calcification rates, carbon contents and stable isotope signatures. In both species, rates of calcification in the light increased at the high CO2 site compared to controls (131% and 41%, respectively). In the dark, calcification was not affected by elevated CO2 in H. digitata, whereas it was reduced by 167% in H. opuntia, suggesting nocturnal decalcification. Calculated net calcification of both species was similar between seep and control sites, i.e., the observed increased calcification in light compensated for reduced dark calcification. However, inorganic carbon content increased (22%) in H. digitata and decreased (-8%) in H. opuntia at the seep site compared to controls. Significantly, lighter carbon isotope signatures of H. digitata and H. opuntia phylloids at high CO2 (1.01 per mil [parts per thousand] and 1.94 per mil, respectively) indicate increased photosynthetic uptake of CO2 over HCO3- potentially reducing dissolved inorganic carbon limitation at the seep site. Moreover, H. digitata and H. opuntia specimens transplanted for 14 d from the control to the seep site exhibited similar delta13C signatures as specimens grown there. These results suggest that the Halimeda spp. investigated can acclimatize and will likely still be capable to grow and calcify in inline image conditions exceeding most pessimistic future CO2 projections. |
| title | Calcareous green alga Halimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps |
| topic | Alkalinity, total; Alkalinity, total, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Benthos; Bicarbonate ion; Bicarbonate ion, standard deviation; Biomass/Abundance/Elemental composition; Calcification/Dissolution; Calcification rate of calcium carbonate; Calcite saturation state; Calcite saturation state, standard deviation; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbon, inorganic, total; Carbon, organic, total; Carbon, organic total/Carbon, inorganic total; Carbon, total; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chlorophyta; CO2 vent; Coast and continental shelf; EXP; Experiment; Field experiment; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gross photosynthesis rate, oxygen; Halimeda digitata; Halimeda opuntia; Light; Macroalgae; Net photosynthesis rate, oxygen; OA-ICC; Ocean acidification; Ocean Acidification International Coordination Centre; Papua_New_Guinea_OA; Partial pressure of carbon dioxide, standard deviation; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH, NBS scale; pH, standard deviation; pH, total scale; Plantae; Potentiometric; Potentiometric titration; Primary production/Photosynthesis; Respiration; Respiration rate, oxygen; Salinity; Single species; Site; South Pacific; Species; Temperature, water; Temperature, water, standard deviation; Treatment; Tropical; δ13C |
| url | https://doi.org/10.1594/PANGAEA.846875 |