西藏东南部边缘地区昆虫多样性的特点

根据西藏东南部边缘地区:墨脱、察隅和米林三县的204科昆虫,分别统计了这三个地区昆虫属和种的数量,其中墨脱昆虫922属、1433种,大大超过西藏已知昆虫的1/3,察隅319属、446种,米林119属、152种;列出了每个地区的珍奇昆虫和特有物种;总结了这些地区物种多样性的种种特点。首先,这些地区昆虫区系的主要组成属于亚热带、热带的区系性质,它们的起源和演化与东洋区的昆虫区系密切相关;第二,这些地区的生态环境复杂,昆虫种类非常丰富,物种的分化十分活跃;第三,这三个地区的特有物种都十分富庶,作为县级行政单位,这种现象在其它地区是非常少见的;第四,这里还保存了众多的古老类群和珍稀物种。

Characteristics of insect diversity in marginal regions of Southeast Tibet,China

According to the total 204 families of the insect fauna in Motuo,Chayu and Milin which locate in the marginal zone of Southeast Tibet,the authors count respectively the number of genera and species in the three counties.The result shows that there are total 922 genera and 1433 species in Motuo,319 genera and 446 species in Chayu and 119 genera and 152 species in Milin.The rare species and the endemic species are listed respectively and the general characters of the insect diversity are discussed.The general characters could be as follows. Firstly,the tropical and subtropical species hold the main part of insect fauna.Secondly,the insect fauna of the marginal regions is abundant and strange because the geomorphology and vegetation of the regions are very complicated.Thirdly,the Himalayan endemic species occupy an important place in the insect fauna of the marginal regions.Lastly,there are a large number of the primitive and rare species which are preserved in valleys.