ALTITUDIAL DISTRIBUTION AND SEASONAL CYCLES OF DROSOPHILID FLIES AT MT. SORANUMA IN NORTHERN JAPAN

Abstract

Altitudinal distribution and seasonal cycles of drosophilid flies were studied at Mt.Soranuma near Sapporo City, northern Japan. Most species were more abundant at lower altitudes, and some species occurred at every altitudes. Only one species was collected mostly at high altitudes. A greater part of high altitude populations of these species was considered to be formed by immigrants from low a1titudes.