Connotea
CiteULike
del.ico.us
BibSonomyAbstract
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,
VOL. 9,
Q01007,
9 PP., 2008
doi:10.1029/2007GC001807 [Citation]
A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies
Department of Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, British Columbia, Canada V6T 1Z4
Department of Earth Sciences, Durham University, Science Laboratories, South Road, Durham DH1 3LE, UK
Department of Anthropology, McMaster University, Hamilton, Ontario, Canada L8S 4L9
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.
Received 30 August 2007; accepted 27 November 2007; published 29 January 2008.
Citation: (2008), A multiaxial growth analysis of stable isotopes in the modern shell of Saxidomus gigantea: Implications for sclerochronology studies, Geochem. Geophys. Geosyst., 9, Q01007, doi:10.1029/2007GC001807.
Cited By