Schuck, M., G. Pasinelli, W. Müller, R. Spaar, A. Aebischer, A. Barbalat, A. Bassin, J. Bühlmann, D. Horisberger, P. Knaus, T. Lüthi, N. Martinez, M. Müller, B. Mulhauser, H. R. Pauli, C. Thiel-Egenter, M. Weggler & R. Ayé
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Entwicklung von Bestand und Verbreitung des Mittelspechts Dendrocopos medius in der Schweiz.
(von 1994 bis 2006 vergeben)
Bestandsentwicklung, Bestandsgrösse, Trend, Verbreitung, Brutgebiet, Eichenwald, Schutzmassnahmen, Artenförderung
Trends of population size and distribution of the Middle Spotted Woodpecker Dendrocopos medius in Switzerland. The Middle Spotted Woodpecker Dendrocops medius is one of 50 priority species of the conservation program «Swiss species recovery program for birds». In 2008, an action plan was published defining the goals, strategies and measures to ensure the survival of the species in Switzerland. The Swiss population was estimated 479 to 618 territories at that time. Since then, surveys were carried out in every canton with breeding populations. Here we give an overview of the current population size and distribution summarizing published and unpublished data. We estimate the current population at 1696 to 2042 territories. The estimate is more than three times larger than in 2008. In Geneva, Neuchâtel, Thurgau and Zurich the study was repeated in identical areas and with identical methods. The population in Geneva is now several times larger than during the last study, probably influenced by the growing population in neighbouring France. In the canton of Thurgau, the population increased by a third; in Zurich, the population roughly doubled since the last survey. Only in the canton of Neuchâtel the population seems to have been stable. Assuming the observed population increase also occurred in other parts of the country, we estimate that the whole Swiss population increased by factor 2 to 2.5 since 2000. The distribution has not changed drastically, locally the population density increased and new records were made at the southern border of the Middle Spotted Woodpecker’s range in Switzerland.
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