Publication Date:
2024-03-15
Description:
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. Increasing seawater temperatures may promote calcification in some corals in the future but are unlikely to benefit the majority of corals, which are already living close to their maximum thermal tolerance limits.
Keywords:
Acid-base regulation; Alkalinity, total; Alkalinity, total, standard deviation; Ammonium; Ammonium, standard deviation; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Boron; Boron, standard deviation; Calcifying fluid, pH; Calcifying fluid, pH, standard deviation; Calcite saturation state; Calcium; Calcium, standard deviation; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cnidaria; Coast and continental shelf; Containers and aquaria (20-1000 L or 〈 1 m**2); Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Magnesium; Magnesium, standard deviation; Nitrate and Nitrite; Nitrate and Nitrite, standard deviation; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Phosphate; Phosphate, standard deviation; Porites sp.; Salinity; Salinity, standard deviation; Silicate; Silicate, standard deviation; Single species; South Pacific; Species; Temperature; Temperature, water; Temperature, water, standard deviation; Treatment: partial pressure of carbon dioxide; Treatment: temperature; Tropical; Type; δ11B; δ11B, standard deviation
Type:
Dataset
Format:
text/tab-separated-values, 423 data points
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