Seawater carbonate chemistry and calcification physiology data in coral reef taxa, supplement to: Comeau, Steeve; Cornwall, Christopher Edward; De Carlo, Eric Heinen; Krieger, E; McCulloch, Malcolm T (2018): Similar controls on calcification under ocean acidification across unrelated coral reef taxa. Global Change Biology

• Main Authors: Comeau, Steeve, Cornwall, Christopher Edward, De Carlo, Eric Heinen, Krieger, E, McCulloch, Malcolm T
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2018
• Subjects: Acropora yongei; Animalia; Benthic animals; Benthos; Calcification/Dissolution; Cnidaria; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Indian Ocean; Laboratory experiment; Macroalgae; Plantae; Pocillopora damicornis; Rhodophyta; Single species; Sporolithon durum; Temperate; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Calcification rate of calcium carbonate; Calcifying fluid, dissolved inorganic carbon; Calcifying fluid, pH; Ratio; Calcifying fluid, aragonite saturation state; Boron/Calcium ratio; Full width at half maximum; Salinity; pH; pH, standard error; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard error; Alkalinity, total; Alkalinity, total, standard error; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide water at sea surface temperature wet air, standard error; Temperature, water; Temperature, water, standard error; Aragonite saturation state; Aragonite saturation state, standard error; Calcite saturation state; Calcite saturation state, standard error; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Potentiometric; Calculated using seacarb; Potentiometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Cornwall; Heinen; Indian; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.892655; https://doi.pangaea.de/10.1594/PANGAEA.892655

Ocean acidification (OA) is a major threat to marine ecosystems, particularly coral reefs which are heavily reliant on calcareous species. OA decreases seawater pH and calcium carbonate saturation state (Omega), and increases the concentration of dissolved inorganic carbon (DIC). Intense scientific effort has attempted to determine the mechanisms via which ocean acidification (OA) influences calcification, led by early hypotheses that calcium carbonate saturation state (Omega) is the main driver. We grew corals and coralline algae for 8 to 21 weeks, under treatments where the seawater parameters Omega, pH and DIC were manipulated to examine their differential effects on calcification rates and calcifying fluid chemistry (Omega cf, pHcf, and DICcf). Here, using long duration experiments, we provide geochemical evidence that differing physiological controls on carbonate chemistry at the site of calcification, rather than seawater Omega, are the main determinants of calcification. We found that changes in seawater pH and DIC rather than Omega had the greatest effects on calcification and calcifying fluid chemistry, though the effects of seawater carbonate chemistry were limited. Our results demonstrate the capacity of organisms from taxa with vastly different calcification mechanisms to regulate their internal chemistry under extreme chemical conditions. These findings provide an explanation for the resilience of some species to OA, while also demonstrating how changes in seawater DIC and pH under OA influence calcification of key coral reef taxa. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) 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 2018-07-26.