Establishment of ecosystem monitoring method using a stable isotope ratios of eggshells of birds flying to the brackish lake

在本研究中，碳酸盐蛋壳的碳同位素氧的测量，即使由于质谱仪的老化而没有得到可靠的测量，在一种粉末状的碳酸盐蛋壳留待将来的状态下也被保存了下来。但是，我们建议对样品处理方法进行改进。壳的结构和厚度有不同种类的特征。在这个特征中可以识别出一些物种。用CNS元素分析仪测定总有机碳、总氮、总硫含量，并用蛋壳碳酸盐粉末进行同位素分析。此外，我们根据这些值计算了TOC/TN比值。此外，对部分元素进行了XRF元素分析。主要元素为Na、Mg和Ca，这些都是不同物种的差异，但综合所有因素可以观察到物种的差异。因此，也有可能从这些分析中鉴定蛋壳的种类，哪些种类可以在一定程度上通过取样片段来鉴定。这将是一个值得开拓的可能性，作为一个监测工具，将继续进一步研究。

In this study, the measurement of carbon isotope oxygen of eggshell carbonate, even if it has not been obtained reliable measurement due to the aging of the mass spectrometer, in a state powdered eggshell carbonate for leave to future has been saved. However, we have proposed to on the method of sample processing. Structure and thickness of the shell is characterized by species were observed. Some species can be identified in this character. Total organic carbon, total nitrogen, total sulfur content were measured in the CNS elemental analyzer using the powder of eggshell carbonate for isotope analysis. In addition, we calculated the TOC/TN ratio from these values. In addition, the XRF elemental analysis was measured about some element. That are valid in the major element, the element was Na, Mg and Ca. These tool are differences by species, but, species differences were observed by combining all factor. Therefore, it is also possible to identify the species of eggshell from these analyzes, which species can be identified to some extent by sampling only fragments. This will be worth that opens up the possibility of as a monitoring tool, will continue to research further.