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Kestenholz, M., F. Korner-Nievergelt, E. Baader, L. Fischer, P. Korner-Nievergelt & W. Schaffner

Phänologie und Wetterabhängigkeit des Herbstzuges der Ringeltaube Columba palumbus auf der Ulmethöchi im Jura: Massenzugtage nach Zugstaulagen.

2009

106

193–207

Key words
(von 1994 bis 2006 vergeben)

Durchzug, Wegzug, Durchzugszahlen, Phänologie, Zugverhalten, Truppgrösse, Wetter, Wind

Schlagwort_Vogelart
(wissenschaftlich)

Columba palumbus

Schlagwort_Vogelart
(deutsch)

Ringeltaube

Schweiz, Basel-Landschaft, Ulmethöchi, Deutschland, Randecker Maar, Schweden, Falsterbo

deutsch

Abhandlung

Autumn migration of Common Wood Pigeon Columba palumbus in the Jura mountains in relation to weather: high variation in daily migratory intensity. – We present the diurnal and seasonal pattern of Common Wood Pigeon Columba palumbus autumn passage at Ulmethöchi, a pass (973 m a.s.l.) in the Jura mountains 20 km to the south of Basel. Data of 21 years (1987–2007) of systematic counts, mainly between 22 September and 5 November, were used. The bulk of pigeons passed during the first three weeks of October, as observed at other European field stations (e.g. southern Sweden and southern Germany). A characteristic of the pigeon passage was the very large fluctuation between days. Even in the middle of the main passage period, days without a single Wood Pigeon occurred quite regularly, while on peak days more than 10000 individuals were counted. In 6 of the 21 years, more than half of the year total was observed on just one or two days. Totals also fluctuated heavily between years. Potentially, low year totals were a result of bad observation conditions (fog) on peak days, or, alternatively, certain weather conditions may have prompted many pigeons to follow a different (regional or local) route instead of crossing the pass. Averaged across the years, we observed a peak of pigeon passage around midday, contrary to the stations at Falsterbo (southern Sweden) and Randecker Maar (southern Germany), where a peak in the morning was registered. Strong wind had a negative influence on the number of migrating Wood Pigeons, independent of the wind direction. Strong migration was mainly observed on days with good weather following days with bad weather, suggesting "Zugstau" (the interruption of migration due to bad weather, leading to local concentrations of migrants and high numbers of migrants once the weather clears up). The more pigeons were migrating, the larger the flocks were. In addition to this mass effect, larger flocks seemed to be somewhat more frequent with higher temperatures.