Distribution of Mudskipper and Living Things in the Tideland Area of the Ariake Sea and Changes of its Environment

1990年至1992年期间进行的研究所得的结果总结如下：分别建立了有限差分法和有限元法模拟有明海水流的数值模型。结果，实现了边界条件随时间变化的海流数值模拟。了解了有明海复杂的水流形态。在野外资料的基础上，明确了浅海附近流动的详细结构。明确了有明海内陆区滩底水体再悬浮的物象特性和机理。建立了用卟啉均解反应测定海水中磷酸盐和天然水中痕量铜（II）的简便、高灵敏度的流动注射分析方法。光散射法测定海水中痕量磷酸盐是分析化学领域中首次提出的方法。阐明了有明海内陆海区海水中氮化合物的空间分布和时间变化，以及磷酸盐和氮化合物的行为与环境因子的关系。明确了有明海内陆滩涂涂鱼保护区和非保护区的线虫区系，讨论了线虫区系与涂涂鱼栖息地的关系。阐明了弹涂鱼的幼虫、幼鱼和刀蛤幼壳的形态、分布及其与滩涂环境因子的关系。此外，还提出了增加弹涂鱼的方法。

The Results obtained by the studies which were carried out over the periods from 1990 to 1992 are summarized as follows:1. The numerical models for the current simulation of the Ariake Sea using the finite difference method and finite element one were developed. As the results, the numerical simulation of the current in the sea where the boundary conditions change with time were enabled. The complex flow patterns in the Ariake Sea were understood.2. The detail structures of flow near the shallow sea bottom were clarified on the basis of the field data. The pheological properties and mechanisms of resuspension of the bottom mad of tideland in the interior parts of the Ariake Sea were made clear.3. The simple and high sensitive methods of flow injection analysis of phosphate in the sea water and specific determination of the trace amounts of copper(II) in the natural waters using the homolysis reaction of porphyrin were developed. The determination of trace amounts of phosphate in the sea water by light scattering were first made in the field of analytical chemistry.4. The spatial distribution and temporal variations of the nitrogen compounds, and the relationship between the behavior of phosphate and nitrogen compounds and the environmental factors in the sea water of tideland area of the interior parts of the Ariake Sea were clarified.5. The nematoda fauna in the protected and unprotected area of mudskipper in the tideland of the interior parts of the Ariake Sea were made clear, and the relationship between nematode fauna and mudskipper's habitat was discussed.The appearance and distribution of mudskipper's larvae and juveniles and young shell of jackknife clam, and the relationship between those and environmental factors of tideland were clarified. In addition, the method for increase of mudskipper were developed.