Abstract
According to current theory young passerine migrants on their first migration are equipped with a genetic programme of duration and direction of migration which enables them to reach their winter quarters independently of adults. The question was investigated whether in birds prevented from gathering migratory experience the genetically determined directional information is expressed only during the first autumn migratory season or whether it is retained as an endogenous directional preference at least throughout the 2nd year of life. One group of Blackcaps Sylvia atricapilla (Linnaeus) each from west and east of the Central European migratory divide was hand-raised, held in captivity for 2 years and its orientation tested in funnel cages during the migration seasons of both years. From mixed pairs of these two parental groups F1-offspring were bred in aviaries, hand-raised and their orientation also tested during the first and second autumn of their lives. In comparison with each other the three groups c...
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