基于昆虫区系的中国东部古北、东洋两界的分界

The boundary of palaearctic and oriental realm in East China based on insect fauna

关于中国东部古北、东洋昆虫区系分界线的争论已持续100多年。以109科20，330种昆虫作为大样本。用数理统计和直接对比的方法证实了，伏牛山．淮河是古北成分和东洋成分比例发生突变的“拐点”，把这裹作为分界绕，和当前的中国动物地理区划及中国昆虫地理区划相同。但东亚成分作为中国昆虫的主体，它的归属至关重要。由于其分布区域主要在西南区、华中区、台湾省、华北区、青藏区以及日本、朝鲜半岛，属于亚热带和温带，因此归属于古北成分较为合理。这样古北、东洋两界的分界线就南移到北纬25°即广东省北部的南岭一带。十分巧合的是这条界践和世界植物区系分区及中国植物区系分区关于两大区的分界织十分相似。考虑到昆虫除极少数类群，如食毛目、虱目、蚤目外，绝大多数昆虫种类和植物有高度生态依存性，因此昆虫和植物两条分界线相似，应该是能够理解和接受的。

A contention about the boundary of the palaearctic and oriental realm in east China were continued for 100-odd years. Regarded 20,330 insects species belong to 109 families as a large sample, the authors proved that Funiu Mt.-Huai River was the in flexion that the ratio of the palaearctic and oriental element sudden change by mathematical statistics methods and direct contrast methods. Taking here as the boundary was the same as the animal region division of China and the insect region division of China at present. However, East Asia element was made up the main body of Chinese insects. A key problem is its belonging to palaearctic or oriental element. Because East Asia element mainly distributed in southwest China, Central China, Taiwan Province, North China, Qingzang Region and Japanese, Korea Peninsula, where belong to subtropical and temperate zone, so, owning it to palaearctic element was reasonable. Thus the boundary of the palaearctic and oriental realm moved south to 25°N that is Nanling Mt., north of Guangdong province. It was an extremely coincidence that the boundary was very similarity to the boundary of the division of two realms about the flora of the world and the flora of China. It should be easy understood and accepted considering that the great majority insects and plants had highly ecological dependence except minority insect groups such as Mallophaga, Anoplura and Siphonaptera.