Seawater carbonate chemistry and shell microstructure, mechanical properties of an edible estuarine oyster, supplement to: Meng, Yuan; Guo, Zhenbin; Yao, Haimin; Yeung, Kelvin W K; Thiyagarajan, Vengatesen (2019): Calcium carbonate unit realignment under acidification: A potential compensatory mechanism in an edible estuarine oyster. Marine Pollution Bulletin, 139, 141-149

• Main Authors: Meng, Yuan, Guo, Zhenbin, Yao, Haimin, Yeung, Kelvin W K, Thiyagarajan, Vengatesen
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2019
• Subjects: Animalia; Benthic animals; Benthos; Bottles or small containers/Aquaria <20 L; Brackish waters; Growth/Morphology; Laboratory experiment; Magallana hongkongensis; Mollusca; North Pacific; Other studied parameter or process; Single species; Tropical; Type; Species; Registration number of species; Uniform resource locator/link to reference; Treatment; Area porosity; Stiffness; Hardness; Density; Volume; pH; pH, standard deviation; Temperature, water; Temperature, water, standard deviation; Salinity; Salinity, standard deviation; Alkalinity, total; Alkalinity, total, standard deviation; Partial pressure of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Calcite saturation state; Calcite saturation state, standard deviation; Aragonite saturation state; Aragonite saturation state, standard deviation; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbon, inorganic, dissolved; Experiment; Potentiometric; Potentiometric titration; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.908459; https://doi.pangaea.de/10.1594/PANGAEA.908459

Ocean acidification (OA) is well-known for impairing marine calcification; however, the end response of several essential species to this perturbation remains unknown. Decreased pH and saturation levels (Omega) of minerals under OA is projected to alter shell crystallography and thus to reduce shell mechanical properties. This study examined this hypothesis using a commercially important estuarine oyster Magallana hongkongensis. Although shell damage occurred on the outmost prismatic layer and the undying myostracum at decreased pH 7.6 and 7.3, the major foliated layer was relatively unharmed. Oysters maintained their shell hardness and stiffness through altered crystal unit orientation under pH 7.6 conditions. However, under the undersaturated conditions (Omega Cal ~ 0.8) at pH 7.3, the realigned crystal units in foliated layer ultimately resulted in less stiff shells which indicated although estuarine oysters are mechanically resistant to unfavorable calcification conditions, extremely low pH condition is still a threat to this essential species. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) 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 2019-11-08.