Calcification repsonse of m,arione bivalves to changed carbonate chemistry ...

• Main Authors: Thomsen, Jörn, Haynert, Kristin, Wegner, K Mathias, Melzner, Frank
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Biological Impacts of Ocean Acidification BIOACID; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.856883; https://doi.pangaea.de/10.1594/PANGAEA.856883

Bivalve calcification, particularly of the early larval stages, is highly sensitive to the change in ocean carbonate chemistry resulting from atmospheric CO2 uptake. Earlier studies suggested that declining seawater [CO32-] and thereby lowered carbonate saturation affect shell production. However, disturbances of physiological processes such as acid-base regulation by adverse seawater pCO2 and pH can affect calcification in a secondary fashion. In order to determine the exact carbonate system component by which growth and calcification are affected it is necessary to utilize more complex carbonate chemistry manipulations. As single factors, pCO2 had no effects and [HCO3-] and pH had only limited effects on shell growth, while lowered [CO32-] strongly impacted calcification. Dissolved inorganic carbon (CT) limiting conditions led to strong reductions in calcification, despite high [CO32-], indicating that [HCO3-] rather than [CO32-] is the inorganic carbon source utilized for calcification by mytilid mussels. ... : Supplement to: Thomsen, Jörn; Haynert, Kristin; Wegner, K Mathias; Melzner, Frank (2015): Impact of seawater carbonate chemistry on the calcification of marine bivalves. Biogeosciences, 12(14), 4209-4220 ...