Population Genetic Structure of the Endemic Land Snail Satsuma nux (Pulmonata: Camaenidae) from Taiwan with Preliminary Phylogenetic Study of Its Akin Species

臺灣特有種栗蝸牛族群遺傳結構暨近緣種親緣關係之探討

吳書平(Wu, Shu-Ping) ； 蔡奇立(Tsai, Chi-Li) ； 黃重期(Hwang, Chung-Chi)

《貝類學報》 42期 (2019/01) Pp. 43-58

摘要

The ground inhabitant camaenid land snail Satsuma nux is an endemic species to Taiwan and widely distributed throughout the western region. In this study, we applied partial mtDNA CO 1 gene sequences to survey the genetic structure from eleven localities and sixty-eight individuals were analyzed from these different localities. The population genetic structure was shown to diverge into three subclades with different genetic characteristics and no apparent gene flow in-between. The southern population exhibits the highest genetic diversity; in contrast, the northern population from Hsinchu has a lower genetic variation. Furthermore, the northern population was analyzed and shown to have a considerable genetic distance from the others. Samples akin to S. nux collected from Kaohsiung, Hualien, Taitung and Pingtung were analyzed to give significant genetic variation and placed on a different clade in the phylogenetic tree, thus infer belonged to a different taxa on the species level.

關鍵字

population genetic structure ； endemic land snail ； Camaenidae ； Satsuma nux

並列摘要

栗蝸牛（Satsuma nux）是廣泛分布於臺灣西部地區的地棲性特有種南亞蝸牛。本研究利用粒線體DNA CO1基因序列片段，分析來自11個樣點68隻栗蝸牛個體，探討其族群遺傳結構。結果顯示栗蝸牛分為北、中、南三大遺傳群，各群有其遺傳特色且群間無明顯基因交流。遺傳多樣性以南部群最高，新竹地區的北部群最低且與其他二群遺傳距離最遠。此外，於高雄、屏東、花蓮及台東等地採集之栗蝸牛亞種與外形相似之種類，遺傳與親緣分析皆顯著異於栗蝸牛，應歸屬於不同物種。

並列關鍵字

族群遺傳結構 ； 特有種蝸牛 ； 南亞蝸牛科 ； 栗蝸牛