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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. 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.

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

Item Type:Article
Full text:PDF - Published Version (1058Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1029/2007GC001807
Publisher 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, 10.1029/2007GC001807. To view the published open abstract, go to http://dx.doi.org and enter the DOI
Record Created:04 Jun 2010 16:50
Last Modified:11 Aug 2010 15:25

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