四川峨眉山寄蝇的垂直分布研究(双翅目:寄蝇科)

对峨眉山寄蝇科的研究表明:寄蝇种类在数量和区系成分两个方面都表现出明显的垂直地带性.寄蝇的垂直分布与其水平分布相适应.寄蝇与其寄主昆虫在垂直分布方面也存在密切的关系.

VERTICAL DISTRIBUTION OF THE FAMILY TACHINIDAE(DIPTERA)IN MOUNT EMEI

In this paper,we list 80 species of Tachinidae flies belonging to 40 genera from Mount Emei.According to the vertical distribution of Tachinidae flies,the mountain may be divided into four vertical zones:1.low-hill zone(500-1100m),2.mid-hill zone(1100-1900m),3.high-hill zone(1900-2800m),4.hill-top zone(2800-3100).Of the total number of species of Tachinidae flies of Mt.Emei,the low-hill zone occupies 60%,the mid-hill zone56.25%,the high-hill zone 30%,the hill-top zone only 8.75%.In the low-hill zone,species of Oriental affinity occupy43.75% of the total number of Tachinidae flies recorded for this zone,while species of Palaearctic affinity occupy only10.42%.The higher the altitude of Mount Emei is,the less the species of Oriental affinity and the more the species ofPalaearctic affinity are.In the hill-top zone,the condition is exactly the reverse.The species distributed in Palaearctic realmoccupy 42.87% of the total number of Tachinidae flies in this zone,while species of Oriental realm occupy only 14.26%.There is some correlation between the vertical distribution and the horizontal distribution of Tachinidae flies,as well as somecorrelation between Tachinidae flies and their hosts in vertical and horizontal distribution.