IFREMER Laboratoire des Ressources Halieutiques d'Aquitaine, UFR côte Basque, 1 Allée du Parc Montaury, 64600 Anglet, France.
Mar Environ Res. 2010 Jul;70(1):35-45. doi: 10.1016/j.marenvres.2010.02.006. Epub 2010 Mar 1.
Sr:Ca and Ba:Ca ratios in water from the Adour estuary show a clear relationship with the salinity of the surrounding water for salinities <20, while ratios are almost constant above this level of salinity. A positive relationship was observed for the Sr:Ca ratio, whereas it was inverse for the Ba:Ca ratio. These two elemental ratios were measured in the otoliths of the European eels (Anguilla anguilla L.) using femtosecond laser ablation linked to an ICP-MS (fs-LA-ICP-MS). There was a direct relationship between the elemental ratios recorded in eel otoliths and those found in water from fresh and marine areas, suggesting that Sr:Ca and Ba:Ca ratios in eel otoliths can be used as markers of habitat in this estuary. Continuous profiling allowed the determination of three behaviour patterns in terms of habitat: freshwater, estuary and migratory individuals. Finally, the above results support the simultaneous use of both ratios for a better understanding of the migratory contingents and also as a relevant method to avoid a misidentification of environmental migratory history due to the presence of vaterite crystal in the otolith matrix.
阿杜尔河口水中的锶钙比和钡钙比与周围水的盐度有明显的关系，<20 时，比值几乎保持不变；而在这个盐度水平以上，比值则呈正相关。锶钙比呈正相关，而钡钙比则呈负相关。这两种元素比值是通过飞秒激光烧蚀结合电感耦合等离子体质谱（fs-LA-ICP-MS）在欧洲鳗鱼（Anguilla anguilla L.）的耳石中测量的。鳗鱼耳石中记录的元素比值与淡水和海洋地区水中发现的元素比值之间存在直接关系，表明鳗鱼耳石中的锶钙比和钡钙比可以作为该河口栖息地的标志。连续剖析可以确定三种行为模式，即淡水、河口和洄游个体。最后，上述结果支持同时使用这两种比值，以更好地了解洄游群体，并作为一种相关方法，避免由于耳石基质中存在文石晶体而导致对环境洄游史的错误识别。
