Alkaline earth metal and Mn distribution in otoliths of Anguilla spp. glass eels and elvers
Alkaline earth metal and Mn distribution in otoliths of Anguilla spp. glass eels and elvers
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DOI：
10.1046/j.1444-2906.2003.00638.x
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发表时间：
2003-04-01
影响因子：
1.9
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Arai, T;Sato, H;Tsukamoto, K
耳石微化学技术的最新进展揭示了大量关于早期生活史的信息，包括安圭拉属淡水鳗的变态时间和持续时间。为了重建耳石的生活史，许多报道使用耳石Sr: Ca比值结合技术来确定耳石的年龄。我们通过检查完全发育的细头鳗（变态前）和玻璃鳗的耳石微观结构和微化学来验证日本鳗鲡变态的时间。结果显示，耳石增量宽度的显著增加，与Sr: Ca比值的下降一致，预示着变态的开始。1,2然而，这些信息主要是通过Sr和Ca含量分析获得的，对鳗鱼耳石中其他元素的分布知之甚少，甚至是碱土金属，由于相同的2+价，它们在化学反应中与Ca具有相似的性质。这些元素在耳石中的分布可以为研究幼鳗幼体生态学提供有价值的工具，并对元素在耳石中的沉积过程有一定的了解。本文采用x射线强度图分析方法，对热带和温带安圭拉鳗类玻璃鳗和海鳗耳石中Mg、Ca、Sr、Ba和Mn的分布进行了研究，描述了玻璃鳗耳石中元素沉积的成因变化。
Recent progress in otolith microchemistry techniques has revealed considerable information about early life history, including the timing and duration of the metamorphosis of the freshwater eel, genus Anguilla. In an attempt to reconstruct the life history, many reports have used otolith Sr: Ca ratios coupled with techniques to determine the age of otoliths. 1–9 We validated the timing of metamorphosis in Anguilla japonica by examining both the otolith microstructure and microchemistry of fully grown leptocephalus (just before metamorphosis) and glass eel. It was revealed that a marked increase in otolith increment width, coincident with a drop in Sr: Ca ratios, heralded the onset of metamorphosis. 1, 2 However, this information was obtained mainly in Sr and Ca contents analysis and little is known about the distribution of other elements in the eel otolith, even alkaline earth metals, which have similar properties to Ca in chemical reactions due to the same 2+ valence. These elemental distributions in the otolith may constitute a valuable tool to study larva and juvenile eel ecology, and provide some understanding of the process of the elemental deposition in otoliths.In the present study, we examined the Mg, Ca, Sr, Ba and Mn distribution in otoliths of glass eels and elvers of some tropical and temperate Anguilla spp. using X-ray intensity map analysis to describe the ontogenic changes in elemental deposition in eel otolith.