Seawater carbonate chemistry and skeletal density of hardground-forming high-latitude Crustose Coralline Algae

• Main Authors: Williams, Branwen, Chan, P T W, Westfield, Isaac T, Rasher, D B, Ries, Justin B
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Adak_Island_OA; Alkalinity; total; Aragonite saturation state; Benthos; Bicarbonate ion; standard error; Calcification/Dissolution; Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Clathromorphum compactum; Clathromorphum nereostratum; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Coulometric titration; Density; Event label; EXP; Experiment; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Gulf_of_Maine_OA; Identification; Laboratory experiment; Location; Macroalgae; North Atlantic; North Pacific; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Plantae; Potentiometric; Potentiometric titration; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.935477; https://doi.org/10.1594/PANGAEA.935477

Crustose coralline algae (CCA) function as foundation species by creating marine carbonate hardground habitats. High‐latitude species may be vulnerable to regional warming and acidification. Here, we report the results of an experiment investigating the impacts of CO2‐induced acidification (pCO2 350, 490, 890, 3200 µatm) and temperature (6.5, 8.5, 12.5°C) on the skeletal density of two species of high‐latitude CCA: Clathromorphum compactum (CC) and C. nereostratum (CN). Skeletal density of both species significantly declined with pCO2. In CN, the density of previously deposited skeleton declined in the highest pCO2 treatment. This species was also unable to precipitate new skeleton at 12.5°C, suggesting that CN will be particularly sensitive to future warming and acidification. The decline in skeletal density exhibited by both species under future pCO2 conditions could reduce their skeletal strength, potentially rendering them more vulnerable to disturbance, and impairing their production of critical habitat in high‐latitude systems.