Study on symbiotic systems with Nothofugus species in southern hemisphere

本研究对南半球的一些食草性昆虫与其寄主植物--假山毛榉属昆虫的亲缘关系进行了研究。本研究结果如下：1）在象甲中，利用假山甲的种类也可能独立起源于大洋洲和南美洲。（2）鳞翅目中与假法甲属关系密切的种类在大洋洲和南美洲均为同属，表明这两种蛾类曾发生过洲际迁徙。

In this study, I examined phylogoenetic relations of some herbivorous insects and its host plants, genus Nothofagus species, which distribute in the Southern Hemisphere. The results of this study are as follows ; 1) In weevils, the species using Nothofagus could be originated independently in Oceania and South America, also. In addition, diversity of both groups were high in Oceania than in South America, 2) In Lepidoptera, closely related species of Nothofagus are used species belongs to same genus in both Oceania and South America, and it is suggested that intercontinental migration had occurred in those moths.