Studiies on the biodiversity in sand dun lakes distributedin Niigaat and Aomori Prefecture

在日本，来自沙丘周围泉水的沙丘湖泊仅限于新泻县和青森县。由于大量的大型植物，它被估计为高度的生物多样性。但是，最近它们被坚硬的湖岸破坏了，比如混凝土和建筑用的大量沙子的样品。在新泻和青森进行了关于沙丘湖泊的紧急研究，特别侧重于湖泊的生物多样性和富营养化。对65个沙丘湖泊(新泻湖26个，青森湖39个)进行了湖沼学描述和动植物区系研究。共记录到底栖无脊椎动物5门173种，隶属于新泻和久比基斯沙丘湖群的5门，步步山沙丘湖群的8门196种，岛下沙丘湖群的5门135种。报道了日本新泻等10种濒临灭绝的无脊椎动物和北部山的普拉库门藻等12种濒危无脊椎动物的分布。水生植物种类较多，包括新泻盐生植物等43种，步步山盐生水生植物10种，岛下水生植物条斑水母12种。我们的研究结果表明，日本沙丘湖泊生物多样性的保护迫在眉睫。

Distribution of sand dune lakes which were fed from the spring water around sand dunes in Japan is restricted to Niigata and Aomori Prefecture. Its have been estimated to be high biodiversity because of mass amount of macrophytes. But, recently they have damaged by hard lakeshore, such as concrete and sampling of mass sand for architectural use. Urgent studies for sand dune lakes, particularly focused to biodiversity and eutrophication of lakes were conducted in Niigata and Aomori. Limnological description and researches on fauna and flora were conducted in sixty-five sand dune lakes (Niigata: 26, Aomori 39). Many species of benthic invertebrates, 173 taxa belonging to 5 phyla from Niigata and Kubikisand dune lake group, 196 taxa belonging to 8 phyla from Byoubusan sand dune lake group, 135 taxa belonging to 5 phyla from Shimokita sand dune lake group were recorded during study. Distribution of ten endangered species of invertebrates such as Cercion plagiosum from Niigata, 12 species such as Culumenella prashadi from Byoubusan were reported. Many species of aquatic macrophytes, 43 species such as Eulyale ferox including halophytes from Niigata, 10 species such as Caldesia parnasifflria from Byoubusan and 12 species such as Najas yezoensis from Shimokita were also reported. Our results show the protection of biodiversity in sand dune lakes in Japan is urgently needed.