Investigating the environmental interpretation of oxygen and carbon isotope data from whole and fragmented bivalve shells

Lacey, J.H. and Leng, M.J. and Peckover, E.N. and Dean, J.R. and Wilke, T. and Francke, A. and Zhang, X. and Masi, A. and Wagner, B. (2018) Investigating the environmental interpretation of oxygen and carbon isotope data from whole and fragmented bivalve shells. Quaternary Science Reviews, 194 . pp. 55-61. ISSN 0277-3791

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Sclerochronological data from whole bivalve shells have been used extensively to derive palaeoenvironmental information. However, little is known about the relevance of shell fragments more commonly preserved in the sediment record. Here, we investigate the oxygen and carbon isotope composition of Dreissena carinata fragments from a core recovered from Lake Dojran (FYRO Macedonia/Greece) to identify their relevance and efficacy as a proxy in palaeoenvironmental studies. We use a modern Dreissena shell to calibrate the relationship between the bivalve and its contemporary environment, which suggests their isotope composition is primarily a function of temperature and water balance. The range of fragment isotope data from the core overlaps with that of unbroken fossil shells, suggesting the fragments broadly record lakewater conditions across the time of deposition. A comparison of the isotope composition of shell fragments and endogenic carbonate shows an offset between the two sets of data, which is likely due to temperature differences between surface and bottom waters, the timing of carbonate precipitation, and productivity-controlled stratification of the dissolved inorganic carbon pool. Shell fragment isotope data seem to reflect the signal of environmental change recorded in other proxy data from the same core and may potentially be used (like endogenic carbonate) to provide information on past changes in lake level.

Item Type: Article
Keywords: Holocene; Palaeoclimate; Stable isotopes; Bivalvia; Dreissena carinata; Shell fragments; Lake sediment; Lake Dojran
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Biosciences
Identification Number:
Depositing User: Eprints, Support
Date Deposited: 06 Jul 2018 13:19
Last Modified: 04 May 2020 19:48

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