Features of the Annual Cycle of the Life and Ecology of the Arctic Warbler (<Emphasis Type="Italic">Philloscopus borealis</Emphasis> Blas.) from Northwestern Siberia in Comparison with the Willow Warbler (<Emphasis Type="Italic">P. trochilus</Emphasis> L.)

This paper considers the features of the ecology and annual cycle of the arctic warbler in the northern part of Western Siberia, which migrates to wintering places to the southeast in Indo-China, in comparison with the ecology of the willow warbler, which migrates to the southwest to Africa. The influence of the length of the migratory path and the ecological conditions of flight on the nesting ecology of the arctic warbler and the possibilities of advancement of the species to the tundra area of the Yamal Peninsula is analyzed.