Seawater carbonate chemistry and calcification conditions and calcification rates of Porites astreoides corals

• Main Authors: Wall, Marlene, Fietzke, Jan, Crook, Elizabeth Derse, Paytan, Adina
• Format: Dataset
• Language: English
• Published: PANGAEA 2019
• Subjects: Acid-base regulation; Alkalinity; total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Boron/Calcium ratio; Calcification/Dissolution; Calcifying fluid; carbonate ion; dissolved inorganic carbon; pH; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate system computation flag; Carbon dioxide; Cnidaria; Coast and continental shelf; Field observation; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth; Growth/Morphology; Identification; Logarithmic base dissociation constant; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Porites astreoides; Ratio; Registration number of species; Salinity; Single species; Site; Species; Temperature; water; Tropical; Type; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.914250; https://doi.org/10.1594/PANGAEA.914250

Ocean acidification is expected to negatively impact calcifying organisms, yet we lack understanding of their acclimation potential in the natural environment. Here we measured geochemical proxies (delta 11B and B/Ca) in Porites astreoides corals that have been growing for their entire life under low aragonite saturation (Omega sw: 0.77–1.85). This allowed us to assess the ability of these corals to manipulate the chemical conditions at the site of calcification (Omega cf), and hence their potential to acclimate to changing Omegasw. We show that lifelong exposure to low Omega sw did not enable the corals to acclimate and reach similar Omega cf as corals grown under ambient conditions. The lower Omega cf at the site of calcification can explain a large proportion of the decreasing P. astreoides calcification rates at low Omega sw. The naturally elevated seawater dissolved inorganic carbon concentration at this study site shed light on how different carbonate chemistry parameters affect calcification conditions in corals.