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Matthias Griesser

30-jähriges Monitoring und Artenförderung des Eisvogels Alcedo atthis an der zürcherischen Thur.

2022

119

246–256

Key words
(von 1994 bis 2006 vergeben)

Bestandsüberwachung, Siedlungsdichte, Revier, Bruterfolg, Brutverluste, Brutplatz, Hochwasser, Störungen, Prädation, Revitalisierung, Fördermassnahmen

Schlagwort_Vogelart
(wissenschaftlich)

Alcedo atthis

Schlagwort_Vogelart
(deutsch)

Eisvogel

Schweiz, Zürich, Thur, Rhein, Andelfingen

deutsch

Abhandlung

30 years of monitoring of Common Kingfisher Alcedo atthis and species-specific conservation measures at the Zurich stretch of the river Thur. – Due to the regulation of the river Thur in the 19th century, the erosion banks as breeding sites for the Kingfisher disappeared. Up to the 1980s, there were few breeding pairs of Kingfishers at the Zurich stretch of the Thur. In the early 1990s, a systematic monitoring was started for the 17 lowest kilometres of the river to survey the effects of species-specific conservation measures. Steep banks were reinstalled by hand or excavator, thus increasing potential breeding sites. At the same time, the official watercourse maintenance began to tolerate flood-related ruptures. As a result, a small local breeding population of Kingfishers emerged. Since 2008, the river’s last four kilometres before confluence with the Rhine were revitalized in the framework of the project «Flood protection and meadow landscape of the Thur estuary». The vast arising erosion banks have been quickly colonised by the Kingfisher. From 2013, the population in the conservation area increased considerably and reached eight breeding pairs in 2020. With 1.3 breeding pairs per kilometre, the maximum possible breeding density at the Thur has probably been reached.