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IBIS
卷 145, 期 1, 页码 106-112出版社
BRITISH ORNITHOLOGISTS UNION
DOI: 10.1046/j.1474-919X.2003.00128.x
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Nocturnal migration of Reed Warblers Acrocephalus scirpaceus was studied by trapping with 'high nets' on the Courish Spit (Eastern Baltic) during spring 1998-2000. In spring, Reed Warblers left the stopover site between 45 and 240 min after sunset (median 84 min), although 85% of birds took off between 45 and 120 min after sunset. Birds did not arrive until the fifth hour after sunset; 67% of birds ended their nocturnal flights in the penultimate hour before sunrise, i.e. at dawn. At the moment of migratory departure, the average Reed Warbler body mass was 12.79 +/- 0.66 g (n = 60). Average body mass of birds ending migratory flight was 11.69 +/- 0.67 g (n = 18). The difference was highly significant. However, more than half of the birds completed migratory flights with a considerable fuel load, and some even had energy stores sufficient for a migratory flight on the next night. The spring migratory strategy of Reed Warblers over Central and Northern Europe probably includes a succession of short migratory flights (4-6 h) during several subsequent nights with 1-day stopovers.
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