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) |
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| Institution: | 1. Manipal Centre for Natural Sciences, Manipal University, Manipal 576104, India;2. Department of Civil Engineering, Manipal Institute of Technology, Manipal University, Manipal 576104, India;3. Indo-French Cell for Water Sciences, IISc-IRD Joint International Laboratory, Indian Institute of Science, Bangalore 560012, India;4. Géosciences Environnement Toulouse (Université de Toulouse, CNRS, IRD), Toulouse, France;1. Department of Imaging and Applied Physics, Curtin University, GPO Box U 1987, Perth 6845, Western Australia, Australia;2. Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark;3. Environmental Measurement and Analysis Center, National Institute of Environmental Research, Environmental Research Complex, Kyungseo-dong, Seo-gu, Incheon 404-170, Republic of Korea;4. Department of Ocean Sciences, Inha University, 100 Inha-ro, Nam-gu, Incheon 402-751, Republic of Korea;5. Key Laboratory of Coast and Island development of Ministry of Education, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China;6. Department of the Environment, Australian Antarctic Division, Channel Highway, Kingston 7050, Tasmania, Australia;7. Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Private Bag 80, Hobart 7001, Tasmania, Australia |
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| 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. |
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