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Walter Christen

Zum saisonalen und nachbrutzeitlichen Auftreten des Mittelspechts Leiopicus medius im Grossraum Solothurn.

2020

117

220–227

Key words
(von 1994 bis 2006 vergeben)

Rufaktivität, Balz, Verhalten, Brutzeit, Reviere, Bestand, Fluktuation, Umherstreifer, Phänologie

Schlagwort_Vogelart
(wissenschaftlich)

Leiopicus medius

Schlagwort_Vogelart
(deutsch)

Mittelspecht

Aareebene, Jura, Solothurn, Bern, Schweiz

deutsch

Abhandlung

On the post-breeding and seasonal presence of the Middle Spotted Woodpecker Leiopicus medius in the Solothurn area. – The Middle Spotted Woodpecker returned as a regular breeding bird in the Solothurn area (525 km2, cantons of Solothurn and Bern) since 2007, after it was absent for about 20 years. Due to the species-specific habitat requirements, many breeding sites or territories are isolated from each other. I recorded occasional observations of Middle Spotted Woodpeckers, mostly of calling individuals, throughout the year from 2007 to 2019. The seasonal numbers of observations had a first peak in March. Around mid-June the first Middle Spotted Woodpeckers appeared outside the known breeding sites. The maximum numbers of observations and of occupied kilometre squares was in July. During this month, roaming Middle Spotted Woodpeckers can often be found in rather untypical habitats. For this reason, July observations do not necessarily indicate breeding, especially at the edge of the breeding area, and would probably lead to an overestimation of the breeding population. Numbers of post-breeding observations between July and October fluctuate strongly from year to year and were highest in 2015. Reasons for the annual fluctuations of observations are probably a fluctuating breeding population and a varying breeding success influenced by weather conditions. It is possible that in years with good breeding success, Middle Spotted Woodpeckers from the Northern Jura in the cantons of Solothurn and Basel-Landschaft migrate to the Swiss Central Plateau after the breeding season and are thus observed in the study area.