Latitudinal Temperature Characteristics of Arrival, Nesting, and Departure of Passerine Birds (Passeriformes, Aves) in the North of Western Siberia

Temperature indicators of the presence of passerine birds in the near-Ob forested tundra and tundra of Yamal Peninsula are considered, with special reference to latitudinal variability. When moving from the forested tundra to the Arctic tundra, a significant decrease in average arrival temperatures and a temperature decrease at the beginning of oviposition are observed, with no temperature effect revealed on the timing of departure. Climate warming in the north of Western Siberia causes a shift in the timing of the beginning of arrival and the beginning of reproduction to earlier dates and a shift in the boundaries of habitats.