Home – Home – Jornals – Contemporary Problems of Ecology 2025 number 5

The ecological and geographical differentiation and dynamics of the spring migration of passerine birds of the Putorana Plateau are analyzed. In 1988-2007, 8 points were surveyed on an area of 250 000 km². The route census method was used. There are 58 species in the fauna of the spring migration period. Birds fly along the coastal-edge strip along rivers or lakes in the northern, western, and eastern directions. The bird population density is 179-332, on average (n = 4) - 231 individuals/km². Significant amplitude of daily abundance indicators of species, asynchrony between phenological phenomena in different species and in individuals of the same species are characteristic. The time interval during which the first individuals usually appear is 4-12 days for different species, 6-9 days for most species, and 8 days on average. Early migrants, such as the horned lark, white wagtail, and brown thrush, usually appear on May 25 - June 4, May 22 - June 1, and May 27-June 2, respectively. Late migrants, such as the sand martin, funnel, common chiffchaff, and arctic warbler, usually appear on June 7-16, June 7-16, June 5-11, and June 10-18, respectively. For most species, the average duration of the entire spring migration is 9-12 days, and the main migration is 4-6 days. The configuration of the spring migration course is a combination of 2-3 waves of varying power, but always with one distinct maximum. Significant bursts of migratory activity of birds occur on days with the lowest air temperature and precipitation in the form of snow or rain. The comparative nature of the spring migration of closely related species in different seasons varies from complete synchronization of the waves of maximum migration to their absolute discrepancy.