The physiological response of two green calcifying algae from the great barrier reef towards high dissolved inorganic and organic carbon (DIC and DOC) availability

• Main Authors: Meyer, Friedrich Wilhelm, Vogel, Nikolas, Teichberg, Mirta, Uthicke, Sven, Wild, Christian, Diaz-Pulido, Guillermo
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2015
• Subjects: Benthos; Bottles or small containers/Aquaria <20 L; Calcification/Dissolution; Chlorophyta; Coast and continental shelf; Halimeda macroloba; Halimeda opuntia; Laboratory experiment; Macroalgae; Other; Other metabolic rates; Plantae; Primary production/Photosynthesis; Respiration; Single species; South Pacific; Tropical; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Calcification rate of calcium carbonate; Replicate; Growth rate; Net photosynthesis rate, oxygen; Respiration rate, oxygen; Gross photosynthesis rate, oxygen; Photosynthesis rate of oxygen; Carbon, inorganic, total; Carbon organic/inorganic ratio; Carbon/Nitrogen ratio; Chlorophyll a; Maximum photochemical quantum yield of photosystem II; Identification; Biological oxygen demand; Nitrite and nitrate, flux; Phosphate, flux; Ammonium, flux; Dissolved organic carbon, flux; Time of day; Carbon, organic, dissolved; pH; pH, standard deviation; Temperature, water; Temperature, water, standard deviation; Salinity; Salinity, standard deviation; Oxygen saturation; Oxygen saturation, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Bicarbonate ion; Bicarbonate ion, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Carbonate ion; Carbon, inorganic, dissolved; Calcite saturation state; Experiment; Potentiometric; Potentiometric titration; Calculated using CO2calc; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.868094; https://doi.pangaea.de/10.1594/PANGAEA.868094

Increasing dissolved inorganic carbon (DIC) concentrations associated with ocean acidification can affect marine calcifiers, but local factors, such as high dissolved organic carbon (DOC) concentrations through sewage and algal blooms, may interact with this global factor. For calcifying green algae of the genus Halimeda, a key tropical carbonate producer that often occurs in coral reefs, no studies on these interactions have been reported. These data are however urgently needed to understand future carbonate production. Thus, we investigated the independent and combined effects of DIC (pCO2 402 µatm/ pHtot 8.0 and 996 µatm/ pHtot 7.7) and DOC (added as glucose in 0 and 294 µmol/L) on growth, calcification and photosynthesis of H. macroloba and H. opuntia from the Great Barrier Reef in an incubation experiment over 16 days. High DIC concentrations significantly reduced dark calcification of H. opuntia by 130 % and led to net dissolution, but did not affect H. macroloba. High DOC concentrations significantly reduced daily oxygen production of H. opuntia and H. macroloba by 78 % and 43 %, respectively, and significantly reduced dark calcification of H. opuntia by 70%. Combined high DIC and DOC did not show any interactive effects for both algae, but revealed additive effects for H. opuntia where the combination of both factors reduced dark calcification by 162 % compared to controls. Such species-specific differences in treatment responses indicate H. opuntia is more susceptible to a combination of high DIC and DOC than H. macroloba. From an ecological perspective, results further suggest a reduction of primary production for Halimeda-dominated benthic reef communities under high DOC concentrations and additional decreases of carbonate accretion under elevated DIC concentrations, where H. opuntia dominates the benthic community. This may reduce biogenic carbonate sedimentation rates and hence the buffering capacity against further ocean acidification. : 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 2016-11-11.