Seawater carbonate chemistry and corrosion and results of the mechanical tests of cidaroid (Eucidaris tribuloides) and a euechinoid (Tripneustes ventricosus) in laboratory experiment

• Main Authors: Dery, Aurélie, Collard, Marie, Dubois, Philippe
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Alkalinity; total; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Calcification/Dissolution; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon; inorganic; dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Corrosion; standard deviation; Echinodermata; Eucidaris tribuloides; Experiment duration; Force; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Laboratory experiment; North Atlantic; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Registration number of species; Salinity; Second moment of area; Single species; Species; Temperature; water; Treatment; Tripneustes ventricosus; Tropical; Type; Uniform resource locator/link to reference; Young's modulus; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.875706; https://doi.org/10.1594/PANGAEA.875706

Echinoderms are considered as particularly sensitive to ocean acidification (OA) as their skeleton is made of high-magnesium calcite, one of the most soluble forms of calcium carbonate. Recent studies have investigated effects of OA on the skeleton of "classical" sea urchins (euechinoids) but the impact of etching on skeleton mechanical properties is almost unknown. Furthermore, the integrity of the skeleton of cidaroids has never been assessed although their extracellular fluid is undersaturated with respect to their skeleton and the skeleton of their primary spines is in direct contact with seawater. In this study, we compared the dissolution of test plates and spines as well as the spine mechanical properties (two-points bending tests) in a cidaroid (Eucidaris tribuloides) and a euechinoid (Tripneustes ventricosus) submitted to a 5-weeks acidification experiment (pHT 8.1, 7.7, 7.4). Test plates of both species were not affected by dissolution. Spines of E. tribuloides showed no mechanical effects at pHSW-T 7.4 despite traces of corrosion on secondary spines. On the contrary, spines of the T. ventricosus were significantly etched at both pHSW-T 7.7 and 7.4 and their fracture force reduced by 16 to 35%, respectively. This increased brittleness is probably of little significance with regards to predation protection but has consequences in terms of energy allocation.