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A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies

Kingston, A.W.; Gröcke, D.R.; Burchell, M.

A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies Thumbnail


Authors

A.W. Kingston

M. Burchell



Abstract

Stable-isotope ratios of two modern Saxidomus gigantea specimens from Namu, British Columbia, are presented to show intraspecimen and interspecimen isotopic variation. Isotopic profiles (δ 13Cshell, δ 18Oshell) were generated along the axis of maximum growth. The profiles show that analogous seasonal variation is recorded in δ 18Oshell; however, significant variability is recorded in δ 13Cshell. We suggest this is caused by differences in metabolic activity between individuals. Intrashell variability along a growth horizon shows good reproducibility in δ 13Cshell but significant variability in δ 18Oshell, especially at the sinistral margin. A multiaxial growth analysis generated several profiles from a single valve. Similar seasonal variations are recorded in δ 18Oshell along all axes. δ 13Cshell show significantly less covariation, possibly related to internal metabolic activity. This study highlights that δ 18Oshell profiles generated from any portion of the shell can be used to evaluate seasonal fluctuations and may be excellent to evaluate types and rates of shell growth.

Citation

Kingston, A., Gröcke, D., & Burchell, M. (2008). A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies. Geochemistry, Geophysics, Geosystems, 9(1), Article Q01007. https://doi.org/10.1029/2007gc001807

Journal Article Type Article
Acceptance Date Nov 27, 2007
Online Publication Date Jan 29, 2008
Publication Date Jan 29, 2008
Deposit Date Jun 4, 2010
Publicly Available Date Mar 29, 2024
Journal Geochemistry, Geophysics, Geosystems
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
Article Number Q01007
DOI https://doi.org/10.1029/2007gc001807

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Copyright Statement
© 2008 American Geophysical Union. Kingston, A. W. and Gröcke, D. R. and Burchell, M. (2008) A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: implications for sclerochronology studies., Geochemistry, Geophysics, Geosystems, 9, Q01007, doi:10.1029/2007GC001807.
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