Completeness of the Seasonal Molting of Passerine Birds (Aves, Passeriformes) in North-Western Siberia
V. N. RYZHANOVSKIY
Institute of Plant and Animal Ecology of the Ural Division of RAS, 620144, Ekaterinburg, 8 Marta str., 202
Keywords: Субарктика, Западная Сибирь, воробьиные птицы, полнота, линька, Subarctic, Western Siberia, passerines, completeness, moult
Abstract
The changeability of seasonal molting completeness of the passerine birds of tundra and forest-tundra of Western Siberia is examined. There are all known variants of passerine molting in North Eurasia - from the complete postjuvenile molting at the places of birth from eggs to its absence and complete postjuvenile molting at the places of wintering or on the ways of migration, from the complete preconnubium molting at the places of wintering to its absence, from complete post-nuptial moult on the breeding grounds to complete molt on the wintering grounds or migration paths. The factors affecting the completeness of moult - features of the development of the subarctic, the length of the migratory route of the photoperiodic conditions during molting are discussed. The greatest influence on the completeness is exerted by the duration of daylight.
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