A large metabolic carbon contribution to the δC record in marine aragonitic bivalve shells

A large metabolic carbon contribution to the δ13C record in marine aragonitic bivalve shells

Geochemistry of Marine Bivalve Shells: the potential for paleoenvironmental reconstruction

1 General Introduction 3 1. Bivalves as environmental proxies: An introduction. 5 2. Materials and Methods: Procedures, equipment, precision and accuracy. 31 3. Validation of LA-ICP-MS results with micromilling and SN-HR-ICP-MS. 59 4. Stable carbon and oxygen isotopes in an aragonitic bivalve (Saxidomus giganteus): assessing the reproducibility and reliability for environmental reconstruction. ...

δC in Mytilus edulis shells: relation to salinity, DIC, phytoplankton and metabolism

Bivalve shells can potentially record the carbon isotopic signature of the dissolved inorganic carbon (δCDIC) in estuarine waters, thereby providing information about past estuarine biogeochemical cycles. However, the fluid from which these animals calcify is a ‘pool’ of metabolic CO2 and external dissolved inorganic carbon (DIC). The incorporation of respired C depleted carbon into the skeleto...

A large metabolic carbon contribution to the dC record in marine aragonitic bivalve shells

It is well known that the incorporation of isotopically light metabolic carbon (CM) significantly affects the stable carbon isotope (dC) signal recorded in biogenic carbonates. This can obscure the record of dC of seawater dissolved inorganic carbon (dCDIC) potentially archived in the shell carbonate. To assess the CM contribution to Mercenaria mercenaria shells collected in North Carolina, USA...

Synchronous barium peaks in high-resolution profiles of calcite and aragonite marine bivalve shells

Barium/Calcium profiles of bivalve shells are characterized by flat background signals periodically interrupted with sharp peaks, with the background signals correlated with water Ba/Ca. To test if the peaks are an environmental signal related to productivity, we analyzed high resolution Ba/Ca profiles in bivalve shells that grew adjacent to one another. Two aragonitic Saxidomus giganteus show ...