Towards to spring migration of birds in the southern part of Bureinsky uplands

In the work, the author considers a general course of spring migration of 57 bird species in the southern part of the Bureinsky uplands. Migration lasts since the end of March until the end of May. The migration maximum intensity is observed in the fourth pentad of May. At the beginning of migration, there fly the species belonging to the Siberian ornitofauna complex. In the last decade of May, species of the Chinese ornitocomplex start prevailing. As the Bureinsky uplands represent an ecological obstacle to birds in cold springs, (this only refers to the birds finding their forage on the earth or water surface) - in such years, early migrants have to fly across the plains adjacent to the uplands. The nesting population of migratory birds forms by the end of May. Their average quantity at the beginning of a nesting period makes 1306 b/km2. The Chinese ornitocomplex makes a basis of all nesting migratory birds. Among the nesting species, there dominate the Brown Flycatcher, Chestnut-flanked White-eye, and the Siberian Blue Robin.