Seawater carbonate chemistry and corrosion and results of the mechanical tests of cidaroid (Eucidaris tribuloides) and a euechinoid (Tripneustes ventricosus) in laboratory experiment, supplement to: Dery, Aurélie; Collard, Marie; Dubois, Philippe (2017): Ocean Acidification Reduces Spine Mechanical Strength in Euechinoid but Not in Cidaroid Sea Urchins. Environmental Science & Technology, 51(7), 3640-3648

• Main Authors: Dery, Aurélie, Collard, Marie, Dubois, Philippe
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2017
• Subjects: Animalia; Benthic animals; Benthos; Calcification/Dissolution; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Echinodermata; Eucidaris tribuloides; Growth/Morphology; Laboratory experiment; North Atlantic; Single species; Tripneustes ventricosus; Tropical; Type; Species; Registration number of species; Uniform resource locator/link to reference; Experiment duration; Treatment; Force; Force, standard deviation; Young's modulus; Youngs modulus, standard deviation; Second moment of area; Second moment of area, standard deviation; Corrosion; Corrosion, standard deviation; Temperature, water; Alkalinity, total; Carbon, inorganic, dissolved; Salinity; Carbonate system computation flag; pH; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Collard; DuBois; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.875706; https://doi.pangaea.de/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. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2016) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2017-05-24.