| Titre : | Alder forests as hitherto neglected breeding habitat of the Middle Spotted Woodpecker Dendrocopos medius |
| Auteurs : | Steffen Weiss, Auteur |
| Type de document : | Article |
| Dans : | Vogelwelt (Die) (124(4) 2003) |
| Article en page(s) : | 177-192 |
| Résumé : | In a contiguous alder forest tract of 1,000 ha in the 'Oberspreewald' (Spreewald Biosphere Reserve) in Brandenburg, NE Germany, a survey of Middle Spotted Woodpecker was carried out by use of a tape lure. A total of 42 territories was mapped, 39 of which could be assigned to pairs, the remaining 3 to single territorial males. On the level of the whole forest tract, the territory centres of the pairs were overlaid with a detailed terrestrial habitat map by means of a geographical information system (GIS). The results show that areas without trees of more than 21 cm breast height diameter (BHD) were avoided by the woodpeckers. Forest tracts with standing dead trees (snags) of more than 35 cm BHD were clearly preferred. With the exception of only two territories, all territories and the 5 nesting cavities found were located in stands with strong-dimensioned dead wood. In at least 14 territories oaks were completely absent. No preference for oaks, which occur scarcely in the alder forests, could be observed. On the level of territories, the home range of a breeding pair in the period when they were feeding young was investigated by use of radio transmitters. The results allow a verification of the GIS habitat analysis. The radio tagging results were complemented by observation of the breeding cavity, where 4 young fledged. The home range of the male comprised 9.4 ha, the home range of the female 5.6 ha. Alder trees thicker than 22-25 cm BHD were preferred for foraging. In addition, the occurrence of some very thick trees and standing dead wood are of particular importance not only for foraging but also the construction of the nesting cavity. |
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