SEASONAL DYNAMICS OF USING HABITAT OF THE YENISEY FLOODPLAIN BY PASSERINE BIRDS IN THE MIDDLE TAIGA ZONE

The seasonal dynamics of passerine birds in habitats of the Yenisey River floodplain (the middle taiga zone) and probable ecological and adaptive factors responsible for it were studied. From early May till mid-September (2008-2009), 62 species of passerines in a 50-ha model plot, which included all the common floodplain habitats, were counted. The comparison of the seasonal spatial and temporal distribution of the species allowed one to distinguish 10 types of the dynamics. These types differed in the duration of staying of the species in the nest area, the presence of nomadic movements, and the intensity of seasonal changes in biotopes. The following most important adaptive causes determining the seasonal strategies of the species were revealed: the nest habitat specialization, migration distances, and the composition of food ration. The seasonal changes in the composition of the population and habitat preferences of ecologically plastic species corresponded to the availability of food resources in the main landscapes of the study region.