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).
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).
复制标题
DOI：
10.1016/j.marenvres.2012.03.006
复制
发表时间：
2012-07
影响因子：
3.3
通讯作者：
H. Tabouret;Sébastien Pomerleau;A. Jolivet;C. Pécheyran;R. Riso;J. Thébault;L. Chauvaud;D. Amouroux
中科院分区：
文献类型：
--
作者：
H. Tabouret;Sébastien Pomerleau;A. Jolivet;C. Pécheyran;R. Riso;J. Thébault;L. Chauvaud;D. Amouroux
研究了大扇贝方解石壳中溶解钡和钼的掺入情况。66个个体连续暴露于两种溶解的Ba和Mo浓度下16天，这两种浓度由两种不同的同位素浓度（97Mo,95Mo;135Ba,137Ba）精确区分。分别用电感耦合等离子体质谱仪（ICP-MS）和激光烧蚀- ICP-MS定量测定软组织和壳体的同位素组成。Ba富集的结果表明，溶解的Ba直接掺入壳中，与它们生长的水中的含量成比例，并延迟6-8天。低峰值贡献和低分配系数（DMo= 0.0049±0.0013）表明，软组织和外壳对Mo富集均不敏感。这些结果消除了溶解相直接富集钼壳，有利于营养吸收，将使用本研究中开发的连续同位素富集方法进行研究。
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.