Birds of Indian Subcontinent

Radar and Field Observations of Diurnal Bird Migration in South Sweden, Autumn 1971

Publication Type:Journal Article
Year of Publication:1972
Authors:ALERSTAM, THOMAS, Ulfstrand, S
Journal:Ornis Scandinavica
Date Published:1972
ISBN Number:00305693
Keywords:Columba, Columba palumbus, Columbidae, Fringilla, Fringilla coelebs, Fringillidae, Palumbus, Sweden
Abstract:Two radar stations and five field observers recorded bird migration in S Sweden during autumn 1971. Large echoes chiefly comprised Columba palumbus flocks. A new pattern of anseriform migration across Skåne from E to W was discovered. Echoes, presumably reflecting Fringilla coelebs migration, showed little correlation in time and space with visible migration of the same species. High-flying passerines did not compensate for cross-winds and were unaffected by leading lines, whilst low-flying passerines compensated for crosswinds and were strongly affected by leading lines. The vast majority of all echoes recorded during the whole period passed in a few days with following winds. Visible migration was most intense under head-wind conditions. Reversed movements occurred regularly.
Short Title:Ornis Scandinavica
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