Latitudinal temperature characteristics of the 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.