Geochemical and Crystallographic Study of Turbo Torquatus (Mollusca: Gastropoda) From Southwestern Australia

L. M. Roger, A. D. George, J. Shaw, R. D. Hart, M. P. Roberts, T. Becker, N. J. Evans, B. J. Mcdonald

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Abstract

Shells of the marine gastropod Turbo torquatus were sampled from three different locations along the Western Australian coastline, namely Marmion Lagoon (31°S), Rottnest Island (32°S), and Hamelin Bay (34°S). Marmion Lagoon and Rottnest Island have similar sea surface temperature ranges that are ∼1°C warmer than Hamelin Bay, with all sites influenced by the warm southward flowing Leeuwin Current. The shells were characterized using crystallographic, spectroscopic, and geochemical analyses. Shell mineral composition varies between the three sites suggesting the influence of sea surface temperature, oxygen consumption, and/or bedrock composition on shell mineralogy and preferential incorporation and/or elemental discrimination of Mg, P, and S. Furthermore, T. torquatus was found to exert control over the incorporation of most, if not all, the elements measured here, suggesting strong biological regulation. At all levels of testing, the concentrations of Li varied significantly, which indicates that this trace element may not be a suitable environmental proxy. Variation in Sr concentration between sites and between specimens reflects combined environmental and biological controls suggesting that Sr/Ca ratios in T. torquatus cannot be used to estimate sea surface temperature without experimentally accounting for metabolic and growth effects. The mineral composition and microstructure of T. torquatus shells may help identify sea surface temperature variations on geological time scales. These findings support the previously hypothesized involvement of an active selective pathway across the calcifying mantle of T. torquatus for most, if not all, the elements measured here.

Original languageEnglish
Pages (from-to)214-231
JournalGeochemistry, Geophysics, Geosystems
Volume19
Issue number1
DOIs
Publication statusPublished - Jan 2018

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sea surface temperature
shell
lagoons
Minerals
Chemical analysis
minerals
environmental control
lagoon
oxygen consumption
Temperature
Mineralogy
bedrock
Trace Elements
mineralogy
trace elements
geological time
discrimination
mineral
Earth mantle
biological control

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Roger, L. M. ; George, A. D. ; Shaw, J. ; Hart, R. D. ; Roberts, M. P. ; Becker, T. ; Evans, N. J. ; Mcdonald, B. J. / Geochemical and Crystallographic Study of Turbo Torquatus (Mollusca : Gastropoda) From Southwestern Australia. In: Geochemistry, Geophysics, Geosystems. 2018 ; Vol. 19, No. 1. pp. 214-231.
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Geochemical and Crystallographic Study of Turbo Torquatus (Mollusca : Gastropoda) From Southwestern Australia. / Roger, L. M.; George, A. D.; Shaw, J.; Hart, R. D.; Roberts, M. P.; Becker, T.; Evans, N. J.; Mcdonald, B. J.

In: Geochemistry, Geophysics, Geosystems, Vol. 19, No. 1, 01.2018, p. 214-231.

Research output: Contribution to journalArticle

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