Seawater carbonate chemistry and cadmium uptake of the smooth scallop Flexopecten glaber

• Main Authors: Nardi, Alessandro, Benedetti, Maura, Fattorini, Daniele, Regoli, Francesco
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Alkalinity; total; standard deviation; Animalia; Aragonite saturation state; Benthic animals; Benthos; Bicarbonate ion; Cadmium; 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; Catalase activity; per protein mass; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Experiment duration; Flexopecten glaber; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Glutathione; per unit wet mass; Glutathione reductase; unit per protein mass; Glutathione S-transferase; activity per protein mass; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.887768; https://doi.org/10.1594/PANGAEA.887768

Ocean acidification (OA) may affect sensitivity of marine organisms to metal pollution modulating chemical bioavailability, bioaccumulation and biological responsiveness of several cellular pathways. In this study, the smooth scallop Flexopecten glaber was exposed to various combinations of reduced pH (pH/pCO2 7.4/3000 µatm) and Cd (20 µg/L). The analyses on cadmium uptake were integrated with those of a wide battery of biomarkers including metallothioneins, single antioxidant defenses and total oxyradical scavenging capacity in digestive gland and gills, lysosomal membrane stability and onset of genotoxic damage in haemocytes. Reduced pH slightly increased concentration of Cd in scallop tissues, but no effects were measured in terms of metallothioneins. Induction of some antioxidants by Cd and/or low pH in the digestive gland was not reflected in variations of the total oxyradical scavenging capacity, while the investigated stressors caused a certain inhibition of antioxidants and reduction of the scavenging capacity toward peroxyl radical in the gills. Lysosomal membrane stability and onset of genotoxic damages showed high sensitivity with possible synergistic effects of the investigated factors. The overall results suggest that indirect effects of ocean acidification on metal accumulation and toxicity are tissue-specific and modulate oxidative balance through different mechanisms.