HYDROLOGICAL CONDITIONS AND WATER RESERVOIRS GEOMORPHOLOGY AS ECOLOGICAL FACTOR OF WATERBIRDS HABITAT IN MOUNTAIN SUBARCTIC
The dependence of waterbirds breeding period and nests distribution on the water level dynamics was analyzed for the mountain subarctic water reservoirs. Hydrological conditions in the early spring limit the period of waterbirds migration and their numerosity. It is also defines the geography of their migration paths in the mountainous region. Summer floods have negative effect on the breeding success of waterbirds. In Subarctic region waterbirds radiation depends on geomorphological characteristics of mountain lakes basins. In the areas with freezing influence of large continental mountain water reservoirs there is breaking of altitudinal pattern of birds communities forming.