Seawater carbonate chemistry and blood acid-base balance and other blood parameters of demersal shark species Haploblepharus edwardsii

• Main Authors: Dziergwa, Jacqueline, Singh, Sarika, Bridges, Christopher R, Kerwath, Sven, Enax, Joachim, Auerswald, Lutz
• Format: Dataset
• Language: English
• Published: PANGAEA 2019
• Subjects: Acid-base regulation; Alkalinity; total; standard deviation; Animalia; Aragonite saturation state; Benthos; Bicarbonate; Bicarbonate ion; Calcite saturation state; Calcium; Calcium ion; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Chlorine; Chordata; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); EXP; Experiment; False_Bay; Fluorine; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.911397; https://doi.org/10.1594/PANGAEA.911397

Global ocean acidification is expected to chronically lower the pH to 7.3 (>2200 µatm seawater pCO2) by the year 2300. Acute hypercapnia already occurs along the South African west and south coasts due to upwelling- and low-oxygen events, with increasing frequency. In the present project we investigated the impact of hypercapnia on the endemic demersal shark species Haploblepharus edwardsii. Specifically, we experimentally analysed acid-base regulation during acute and chronic hypercapnia, the effects of chronic hypercapnia on growth rates and on denticle structure- and composition. While H. edwardsii are physiologically well adapted to acute and chronic hypercapnia, we observed, for the first time, denticle corrosion as a result of chronic exposure. We conclude that denticle corrosion could increase denticle turnover and compromise hydrodynamics and skin protection.