| Titre : | Population dynamics of Nuthatch (Sitta europaea) in forests of Baden-Wuerttemberg, SW-Germany |
| Auteurs : | Wulf Gatter, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (39(3) Feb., 1998) |
| Article en page(s) : | 209-216 |
| Langues: | Allemand |
| Résumé : | Since the 1950's a large number of nest boxes has been hang up and checked by the Forests Department of Baden-Wurttemberg, In the period of time up to 1996 an increasing number of now approximately 180,000 boxes were checked each autumn. About 460,000 nest records of Nuthatch (Sitta europaea) in nestboxes in Baden-Wurttemberg forests (SW-Germany) were analysed with the aim of establishing whether any change in population status had occurred within that period of time. Numbers in a small area were stable or showed only a small increase from 1930 to after 1950 but increased afterwards. Records of the forest department from 1952 onwards, show beside some strong annual fluctuations which are mainly caused by the amount of beechnuts available a long term population increase, which has now lasted for about 40 years and has shown recent signs of speeding up. The population increase in warmer low-lying areas with a high proportion of deciduous trees is smaller than in cooler submontane and montane areas with more evergreen conifers. This is attributed to the capacity limit having been reached in warm areas. This development was not noted in most sample areas with nest boxes. In order to establish the real extent of population changes in any species, monitoring programmes therefore should equally consider both optimum and suboptimum areas of the species' distribution. The material presented here relates to altitudes of between 100-1200 m a.s.l. |
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