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Fabian Anger, Ulrich Dorka, Nils Anthes, Christoph Dreiser, Marc I. Förschler

Bestandsrückgang und Habitatnutzung bei der Alpenringdrossel Turdus torquatus alpestris im Nordschwarzwald (Baden-Württemberg).

2020

117

38–53

Key words
(von 1994 bis 2006 vergeben)

Bestand, Revierkartierung, Höhenverteilung, Lebensraum, Habitatnutzung, Waldstruktur, Phänologie, Erstankunft, Erstgesang, Jahresmitteltemperatur, Schneetage, Klimawandel, Sturmwurf

Schlagwort_Vogelart
(wissenschaftlich)

Turdus torquatus alpestris, Turdus torquatus torquatus, Turdus merula, Turdus philomelos, Turdus viscivorus

Schlagwort_Vogelart
(deutsch)

Alpenringdrossel, Nordische Ringdrossel, Amsel, Singdrossel, Misteldrossel

Schwarzwald, Baden-Württemberg, Deutschland

deutsch

Abhandlung

Population decline and habitat use of the Alpine Ring Ouzel Turdus torquatus alpestris in the Northern Black Forest (Baden-Württemberg). – As a bird species of the uplands and mountains, the Alpine Ring Ouzel is considered particularly susceptible to potential direct and indirect effects of climate change; it is now considered as critically endangered in Baden-Württemberg. In this context, we investigated changes in the species’ population size and distribution in the northern Black Forest and documented its habitat characteristics compared with other sympatric thrush species. In the 1980s, about 125 territories were counted in a first complete census. In 2017–2018, we found only 36–48 territories, indicating a population decline by about two-thirds. In contrast to the optimal habitats reported in the literature, the remaining territories are primarily located in single-story spruce forests rather than in old, layered and open forests. Habitat analysis based on aerial images showed that Alpine Ring Ouzel territories share habitat characteristics with the Mistle Thrush Turdus viscivorus, while there was less overlap with the more frequent Blackbird T. merula and Song Thrush T. philomelos. Complex influencing factors seem to underlie the documented decline of this rather isolated and marginal breeding population. Particularly plausible causes for the decline may be climate change impacts, such as an earlier snowmelt and an elongated vegetation period, and changes in forest structure due to large-scale storm damage in the year 1999.