Seawater carbonate chemistry and coral calcification media pH ...

• Main Authors: Allison, Nicola, Cole, Catherine, Hintz, Chris, Hintz, Ken, Rae, James, Finch, Adrian A
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Acid-base regulation; Animalia; Benthic animals; Benthos; Cnidaria; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Laboratory experiment; Porites sp.; Single species; South Pacific; Temperature; Tropical; Type; Species; Experiment duration; Treatment temperature; Treatment partial pressure of carbon dioxide; Temperature, water; Temperature, water, standard deviation; Salinity; Salinity, standard deviation; pH; Calcium; Calcium, standard deviation; Magnesium; Magnesium, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Aragonite saturation state; Boron; Boron, standard deviation; δ11B; δ11B, standard deviation; Ammonium; Ammonium, standard deviation; Phosphate; Phosphate, standard deviation; Silicate; Silicate, standard deviation; Nitrate and Nitrite; Nitrate and Nitrite, standard deviation; Calcifying fluid, pH; Calcifying fluid, pH, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide water at sea surface temperature wet air; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.939992; https://doi.pangaea.de/10.1594/PANGAEA.939992

Ocean acidification typically reduces the calcification rates of massive Porites spp. corals, but increasing seawater temperatures (below the stress and bleaching threshold) can offset this effect. Here, we use delta 11B to reconstruct the pH of the calcification media (pHECM) used to precipitate the skeleton in poritid corals cultured over a range of seawater pCO2 and at 25 °C and 28 °C. Increasing temperature had no significant effect on pHECM at high pCO2 although corals increased their calcification rates. pHECM was reduced at 28 °C compared to 25 °C at low seawater pCO2, although calcification rates remained constant. Increasing calcification rates could reflect the positive influence of temperature on aragonite precipitation rate, an increase in calcification media saturation state or a change in the concentration/behaviour of the skeletal organic matrix. The two temperatures utilized in this study were within the seasonal range at the coral collection site and do not represent a heat stress scenario. ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) 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 2022-1-12. ...