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Christen, W. & E. Reist

Unterschiedliche Stärke des Frühjahrs- und Herbstzuges von Rohrweihe Circus aeruginosus und Fischadler Pandion haliaetus an zwei Beobachtungsplätzen im Schweizer Mittelland.

2009

106

181–192

Key words
(von 1994 bis 2006 vergeben)

Schweiz, Bern, Solothurn, Aareebene, Häusernmoos

Schlagwort_Vogelart
(wissenschaftlich)

Circus aeruginosus, Pandion haliaetus

Schlagwort_Vogelart
(deutsch)

Rohrweihe, Fischadler

Durchzug, Frühlingszug, Herbstzug, Zugverhalten, Zugweg, Phänologie, Wind

deutsch

Abhandlung

Differences in the intensity of spring and autumn migration of Western Marsh Harrier Circus aeruginosus and Osprey Pandion haliaetus at two observation sites on the Swiss Plateau. – Migration intensity of Western Marsh Harrier and Osprey on the Swiss Plateau varies, depending on topography. On the Aare plain at the southern foot of the Jura mountains near Solothurn spring migration of both species is more intensive than autumn migration. At Häusernmoos in the Emmental region, situated more closely to the Alps at the northwestern edge of the Napf hills, however, migration in autumn is more intensive than in spring. From 1984 to 2007 88 % of migrating Western Marsh Harriers and 87 % of Ospreys were observed in the Aare plain in spring, at Häusernmoos 73 % of Western Marsh Harriers and 84 % of Ospreys in autumn. The differences between these two sites situated only 20 km apart can be explained by topographical features and the main direction of migration. Additionally, migration intensity at the two sites is influenced by the prevailing wind.