Seasonal Phenomena of the Annual Cycle in Whitethroat (Sylvia communis) in the South of West Siberia
V. M. Chernyshov
Keywords: whitethroat, migration, laying dates, clutch suze, egg size variability, reproduction efficiency, moult
Pages: 139-148
Abstract
Features of whitethroat migration, nesting and moult in the Baraba forest-steppe (south of West Siberia) were studied on the basis of perennial data. The parameters of reproduction as the basis of adaptation of this species to habitation conditions were considered in detail. The variability of reproductive indices of whitethroat inhabiting the south of West Siberia is relatively low and comparable with the available literature data for other parts of the habitat. Deficit of the time of residence in nesting region, which is due to the large distance from wintering area and climatic conditions, is compensated mainly due to a decrease in the completeness of postnuptial moult and its superposition with the beginning of autumn migration.
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