DISTRIBUTION PECULARITIES OF THE SAND (RIPARIA RIPARIA LINNAEUS 1758) MARTIN AND THE PALE SAND (RIPARIA DILUTA SHARPE ET WYATT 1893) MARTIN (PASSERIFORMES, HIRUNDINIDAE) IN THE SYMPATRY ZONE IN THE SOUTH OF CENTRAL SIBERIA

摘要

Relationships between the sand martin, Riparia riparia Linnaeus 1758, and the pale sand martin, Riparia diluta Sharpe et Wyatt 1893, in sympatric conditions in the south of Central Siberia are discussed. New data on the distribution patterns of these two closely related martin species in the study area, the location of breeding colonies, and the nesting in mixed-species colonies are presented. Information on the morphology and habitat preferences of R. riparia and R. diluta, including co-nesting species, is provided. In the sympatry zone in the south of Central Siberia, the pale sand martin is shown to be more abundant, with mixed colonies of R. riparia and R. diluta also being found. Both study species differ significantly in morphometric characters. When looking for the location of a breeding colony, R. riparia and R. diluta show different habitat requirements.