|| 要旨トップ | 目次 |||日本生態学会第62回全国大会 (2015年3月、鹿児島) 講演要旨
一般講演（ポスター発表） PB2-015 (Poster presentation)
Quantitative analyses were made for land snail fauna among the islands located in the Tokara Islands located in the northern part of the Ryukyu Islands and range over approximately 180 km from north to south in sourthern part of Japan . This area has been considered to be the border area between the Palearctic region and the IndoMalaya (Oriental) region form a point of view that is the biogeography of the animal. Faunal boundary between the Palearctic region and the IndoMalaya region wihich is called Watase Line, is pulled between Akuseki-jima and Kodakara-jima in Tokara Islands. We conducted a more detailed faunal survey on the land snail species in this region in 2007 to 2014. Faunal similarities among the islets are shown by Nomura-Simpson’s Coefficients (NSC; Simpson, 1949), and a dendrogram was drawn adopting the group average method. In total, 44 species belonging to 32 genera in 13 families were collected throughout this survey, among which eight species represented first records for particular islands. In land snail fauna, Kuchino-shima formed a group with Nakano-shima, Taira-jima, Suwanose-jima and Akuseki-jima. Kodakara-jima and Takara-jima formed another cluster. A clear faunal boundary was recognized between Akuseki-jima and Kodakara-jima as documented in some other animal groups.