The assessment that an introduced species coming up out of the non-marine mollusks influence islands ecosystem by gene pollution

在鹿儿岛北方的琉球群岛（大住诸岛、土加罗诸岛、奄美诸岛）和鹿儿岛大陆，研究了非海洋软体动物的引进种和特有种。(1)I调查了某海岛特有陆生蜗牛的分布情况和栖息现状。特别是调查了引进物种的影响情况。本研究选择了淡水产品特有的双壳类双壳纲肺螺目的前鳃亚纲陆生螺、淡水螺、淡水螺、布氏螺、布氏螺科。对一种特有种的生境现状调查和一种引进种的影响情况进行了研究。（2）阐明了部分引种陆生蜗牛对当地特有种的影响，并对其生态影响进行了评价。在北琉球群岛，从国内引进种多的情况比从国外引进种多的情况更明显。（3）利用RAPD技术对四种特有种和一种引进种的DNA进行了分析。其中一部分成果做了专利申请。专利名称为“利用软体动物的体液/粘性液体提取物的活生殖细胞的核酸和解析方法”。(4)In一些特有物种，在该国的生活史，成为一个引进物种在外国领土进行了说明。在日本特有种中，有几种brakishuwater蜗牛威胁着外国领土上的引进物种或当地特有的生态系统。因此，在日本原产地的栖息地，阐明了这些蜗牛物种的基本习性。

In the Ryukyu chain of islands northern part of Kagoshima (Osumi-shoto Islands, Tokara islands, Amami-shoto Islands) and the Kagoshima mainland, I studied introduced and endemic species of non-marine mollusks.(1)I investigated the distribution situation of a peculiar land snail of an island and the habitation present situation. In particular it was investigated the influence situation of an introduced species. In this study, a land snail of Subclass Prosobranchia, flesh water snail, brakishwataer snail, Bradibaenidae of Pulmonata, an endemic species of Bivalvia of a fresh water product were selected. Habitation present situation investigation of an endemic species and the influence situation of an introduced species were studied.(2)The influence that land snail of some introduced species gave endemic species was elucidated, and it was evaluated the influences of ecosystem. In north Ryukyu islands, a thing with many introduced specieses introduced from the country was elucidated than an introduced species introduced from a foreign territory.(3)Four kinds of endemic specieses, DNA of one kind of introduced species were analyzed by RAPD method. One part of result did patent application. The patent name is "a nucleic acid and a resolution method of a live germ cell to use bodily fluids / viscous liquid extraction thing of a mollusk".(4)In some endemic species, the life cycle in the country of the kind that became an introduced species in a foreign territory was elucidated. In a Japanese endemic species, several kinds brakishuwater snail threatens an introduced species or local peculiar ecosystem in a foreign territory. On this account, in a habitat of the Japanese place of origin, the basics habits of these snail species were elucidated.