Specific pathways for the incorporation of dissolved barium and molybdenum into the bivalve shell: An isotopic tracer approach in the juvenile Great Scallop (Pecten maximus)

Hélène Tabouret 1, * Sébastien Pomerleau 2 Aurélie Jolivet 3 Christophe Pécheyran 1 Ricardo Riso 3 Julien Thébault 3 Laurent Chauvaud 3 David Amouroux 1
* Corresponding author
1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 Departement de Biologie, Chimie et Géographie
3 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
Abstract : Dissolved barium and molybdenum incorporation in the calcite shell was investigated in the Great Scallop Pecten maximus. Sixty six individuals were exposed for 16 days to two successive dissolved Ba and Mo concentrations accurately differentiated by two different isotopic enrichments (97Mo, 95Mo; 135Ba, 137Ba). Soft tissue and shell isotopic composition were determined respectively by quantitative ICP-MS (Inductively Coupled Plasma Mass Spectrometer) and laser ablation - ICP-MS. Results from Ba enrichment indicate the direct incorporation of dissolved Ba into the shell in proportion to the levels in the water in which they grew with a 6-8 day delay. The low spike contributions and the low partition coefficient (DMo = 0.0049 ± 0.0013), show that neither the soft tissue nor the shell were significantly sensitive to Mo enrichment. These results eliminate direct Mo shell enrichment by the dissolved phase, and favour a trophic uptake that will be investigated using the successive isotopic enrichment approach developed in this study.
Keywords : Pecten maximus Molybdenum Femtosecond laser ablation Scallop shell Barium Isotopes Tracers Biogeochemical cycle
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Journal articles
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https://hal.univ-brest.fr/hal-00721522
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Submitted on : Friday, July 27, 2012 - 4:39:54 PM
Last modification on : Wednesday, August 14, 2019 - 2:02:01 PM

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Hélène Tabouret, Sébastien Pomerleau, Aurélie Jolivet, Christophe Pécheyran, Ricardo Riso, et al.. Specific pathways for the incorporation of dissolved barium and molybdenum into the bivalve shell: An isotopic tracer approach in the juvenile Great Scallop (Pecten maximus). Marine Environmental Research, Elsevier, 2012, 78, pp.15-25. ⟨10.1016/j.marenvres.2012.03.006⟩. ⟨hal-00721522⟩

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