Endemic species and their speciations on the Tokara Islands : studies of the ancestors'invasions and geographic isolation mechanisms among the island populations.

1)关于托卡拉群岛及其邻近地区特有的杜鹃花属杜鹃(杜鹃花科)，采集了该群岛不同地区的活体标本(978株)。这些样品是在鹿儿岛大学的一个实验园里培养出来的，用于形态分析。对天然居群和栽培居群的叶片形态进行了比较。在形态分析中，每个样品的叶形通过光学扫描系统(EPSON GT 6500)转换成计算机图像数据(PICT数据)。在Macintosh Quadra 840AV计算机系统上对PICT数据中的几个叶形性状进行了测量和分析。2)在Experim…种植了2 0 0份刺绣球和罗汉果树标本。鹿儿岛大学更具东方气息的花园。3)在本研究的田野工作中，对前胡的木本植物进行了研究。在托卡拉群岛发现了通常为草本的伞形科和新变型的Viola植物(Viola科)，在花序中显示了一些花。从该群岛采集了约970份日本疫霉和约200份Viola sp.的标本，它们的形态分析正在进行中。4)通过本研究的野外工作，托卡拉细辛的活体标本。Tokara岛特有的Aristolochiaceae)及其邻近岛屿的近亲：Amami-Ohshima、Tokunoshima、Kuroshima、Yakushima。对这些样品进行了形态分析。5)菊花的核型分析。使用计算机图像分析仪(彩色视频Macintosh系统)对托卡拉群岛进行了(菊科)图像分析。这些植物在叶背面的毛密度上与粗毛石杉相似，但与其他地区的粗毛石杉的染色体数目相同(2n=72：八倍体)。在不久的将来，这一分析可能会揭示一个有趣的结果。较少

1) With regard to Rhododendron eriocarpum Nakai (Ericaceae) endemic to the Tokara Islands and its neighboring area, living samples (978 strains) were obtained from various areas of the Islands. The samples were cultivated at an experimental garden of Kagoshima University for the morphological analyzes. A comparison mainly in leaf morphology was made between the natural and the cultivated population samples. In the morphological analyzes, the leaf shape of each samples was transformed into computer picture data (PICT data) by an optical scan system (EPSON GT 6500). Several characters of leaf shape were measured and analyzed in the PICT data on a computer system (Macintosh Quadra 840AV). As a result, the morphological variations of R.eriocarpum were revealed, and the data obtained show the progress of the species in ecological differentiation among natural populations.2) About 200 samples of Hydrangea kawagoeana Koidz.and H.grosseserrata Engler (Saxifragaceae) were planted at the experim … More ental garden of Kagoshima University. The morphological analyzes of these species are carried out now.3) On the field works of this research, the woody plants of Peucedanum japonicum Thund. (Umbelliferae) that is generally herbaceous, and new form of Viola plants (Violaceae) showed some flowers in an inflorescence were found from the Tokara Islands. About 970 samples of P.japonicum and about 200 samples of Viola sp.were collected from the Islands, and their morphological analyzes are now in progress. It is considered that these new forms are now differentiated on the Tokara Islands.4) By the field works of this research, the living samples of Asarum tokarense Hatusima (=Heterotropa yakusimensis var. glabra ; Aristolochiaceae) endemic to the Tokara Islands, and its relatives of neighboring islands : Amami-ohshima, Tokunoshima, Kuroshima, Yakushima, were collected. These samples are now subject to the analyzes of their speciations.5) A karyotype analysis of Dendranthema ornatum Kitam. (Compositae) of the Tokara Islands was carried out by the computer image analyzer (Color-Video Macintosh System). The plants are similar to D.crassum Kitam.in hair density on abaxial surface of a leaf, but show the same chromosome number (2n=72 : octaploid) with D.ornatum of other areas. An interesting result may be revealed by this analysis in the near future. Less