Environmental Controls on the Geochemistry of a Short-Lived Bivalve in Southeastern Australian Estuaries

  • Briony K. ChamberlayneEmail author
  • Jonathan J. Tyler
  • Bronwyn M. Gillanders


Geochemical signals in bivalve carbonate hold the potential to record environmental change over timescales from months to centuries; however, not all bivalves provide reliable proxy records, and modern studies are essential to calibrate these relationships prior to use in palaeo-environmental reconstruction. In this study, 19 shells of the estuarine bivalve Arthritica helmsi, from 14 sites in Southeastern Australia, were obtained from museum collections and analysed for trace elemental (Sr/Ca, Mg/Ca, Sr/Li and Ba/Ca) and stable isotopic ratios (18O/16O and 13C/12C). Mean Sr/Ca and Mg/Ca exhibited significant negative correlations to temperature (R2 = 0.49, p = 0.001; R2 = 0.25, p = 0.02) in agreement with previously published models for trace element partitioning into inorganic aragonite. In addition, the within-shell range of Sr/Ca and Mg/Ca, as measured by laser ablation ICP-MS, correlated to the temperature range (R2 = 0.22, p = 0.03; R2 = 0.46, p = 0.002, respectively). Sr/Li ratios were also negatively correlated to temperature (R2 = 0.34, p = 0.008); however, a significant difference in the model coefficients with previous studies indicates this proxy should be applied with caution. Both oxygen and carbon isotope values exhibited large differences between shells from terrestrial, estuarine and marine waters, suggesting that these stable isotopes hold a potential to record large environmental changes such as sea-level changes or freshening/salinisation in estuarine environments. This study presents the first geochemical study of Arthritica helmsi, highlighting its potential as an environmental tracer.


Arthritica helmsi Trace elements Stable isotopes Laser ablation ICP-MS Museum specimens 



The authors would like to acknowledge Kirrily Moore from the Tasmanian Museum and Art Gallery, Chris Rowley from Museum Victoria and Mandy Reid from The Australian Museum for providing samples for this study. Sarah Gilbert, Mark Rollog, Ben Wade, Tony Hall and Ken Neubauer are thanked for their assistance with trace elemental analyses, stable isotope analyses, electron microprobe analyses, XRD analysis and SEM imaging, respectively.

Funding Information

This research was supported by a grant from the Sir Mark Mitchell Foundation, South Australia.

Supplementary material

12237_2019_662_MOESM1_ESM.docx (2.8 mb)
ESM 1 (DOCX 2889 kb)


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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  1. 1.Department of Earth Sciences and Sprigg Geobiology CentreThe University of AdelaideAdelaideAustralia
  2. 2.Southern Seas Ecology Laboratories and the Environment Institute, School of Biological SciencesThe University of AdelaideAdelaideAustralia

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