Home – Home – Jornals – Contemporary Problems of Ecology 2025 number 2

The ecological and geographical differentiation and dynamics of the autumn migration of passerine birds of the Putorana Plateau are analyzed. In 1988-2004 on an area of 150000 km², 8 points were surveyed in the western and central parts of the region. The route accounting method was used. The passerine fauna of Putorana during the autumn migration period includes 42 species. Birds fly along a narrow coastal-edge strip along the banks of large rivers or lakes in the southern, southwestern or western directions. There are species distributed everywhere ( n = 16; 38 %), locally ( n = 9; 22 %), and locally ( n = 17; 40 %). Bird population density is 239-643, on average ( n = 8) - 440 individuals/km². The population density of passerines during autumn migration is maximum in the south of Putorana, less in the middle part of the region, and minimal in the north of the plateau. At multi-day observation points on the days of the most intense flight, the population density was 420-796, with an average ( n = 2) of 608 individuals/km². Passerines fly at 8.00-12.00. For most species, the average duration of the entire autumn migration is 20-26 days, the main one is 7-12 days. The vast majority of individuals of almost all migratory species are united in monospecific and polyspecific flocks. The configuration of the autumn flight is a combination of four waves with four well-defined maximums. The most powerful surges of migration activity are associated with a decrease in air temperature and the absence of precipitation. The bulk of individuals of different species of the same genus usually migrate on different days. Synchronization of waves of maximum passage is rare in related species. The population is dominated numerically by the Arctic Warbler, the Common Redpoll, and the Little Bunting.