Martinez, N., T. Lüthi, W. Müller, H. R. Pauli, C. Suter, J.-P. Biber, J. Borer, W. Christen, B. Schluep & R. Ayé
(* = Kurzbeitrag)
Der Bestand des Mittelspechts Dendrocopos medius in den Kantonen Basel-Landschaft, Basel-Stadt, Bern und Solothurn.
(von 1994 bis 2006 vergeben)
Verbreitung, Bestand, Bestandsentwicklung, Arealausdehnung, Höhenverbreitung, Lebensraum, Kartierungsmethode, Forstwirtschaft, Waldbewirtschaftung, Artenförderungsprogramm
Schweiz, Basel, Bern, Solothurn
Middle Spotted Woodpecker Dendrocopos medius population in the cantons of Basel-Landschaft, Basel-Stadt, Bern and Solothurn. The Middle Spotted Woodpecker Dendrocopos medius is one of 50 priority species for species recovery programmes in Switzerland and its Red List status is considered as Near Threatened. Nevertheless, knowledge of the exact distribution and accurate population size in several cantons containing strongholds of the species are inadequate or outdated. The poor quality of the data is mainly due to the cryptic life of the Middle Spotted Woodpecker. Thus, it can only be recorded reliably with species-specific survey methods. Population surveys with such methods were previously missing from the cantons of Basel-Landschaft, Basel-Stadt and Solothurn, although these cantons are known to be important distribution centres for the species. For these reasons, a species-specific survey was conducted in 2012 to assess population size and distribution of the Middle Spotted Woodpecker in potential habitats in these cantons. Simultaneously, the same method was applied in adjacent regions of the canton of Bern. Overall, we found 415 territories, and we estimated total population size for the four cantons at 455 to 610 breeding pairs. This corresponds to a fivefold increase compared to older data. The comparison with existing data shows that this difference is partly due to methodological differences between the surveys. However, part of the observed increase is also due to a real population increase and an associated range expansion. Due to the large and increasing population, the Middle Spotted Woodpecker is barely threatened in northwestern Switzerland for the moment. However, since oaks of medium ages classes are rare in many forests because oak regeneration was neglected in the 20th century, specific measures for the Middle Spotted Woodpecker should remain an important component of forest management.
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