De terugmeldingen van Bonte Vliegenvangers Ficedula hypoleuca geringd in het Deelerwoud in de periode 1970-1993

The principal study area, het Deelerwoud, is situated in the south of the Veluwe and is mainly covered with coniferous woods intersected with birches on poor sandy soil. The area is classified on the Sovon atlas as 33-53 and 33- 43, insects of areas of 5x5 km. Two hundred nest boxes were provided to an area of 1225 ha. Each year most breeding females were trapped during incubation. Males were not trapped. The following results were obtained: 1. The number of nests increased from 25 to 89 from 1972-93 and the number of ringed nestlings increased from about 100 to 462 during the same period (table 1). 2. From the ringed nestlings 1.1 to 9.3% were retrapped in the Deelerwoud and other areas (table 1) 3. The average age was 2.1 and the sd. 0.7 (table 1). The oldest bird was 7 year old and most nestlings were retrapped after 1-2 years (table 2). 4. Survival rate tor birds banded as nestling was 78% after the first yeat: 5. Dispersion: 55% of the pulli nested in later years in their birth place, while 45% (table 2) moved to other areas at distances varying from 10-100 km (figures 1 and 2). 6. From the females 90% nested in subsequent years in the same area, whereas only 10% nested in later years at distances varying from 10 to 70 km (figures 1 and 2). 7. Distances between Deelerwoud and the areas were birds were retrapped were not more than 10 km, such as De Hoge Veluwe, Noord-Ginkel and Loenermark. Only a few birds were retrapped at a distance of 90-100 km (figure 1). 8. In Deelerwoud birds were also captured which were ringed elsewhere. In most cases the distances between those areas and Deelerwoud were also not more than 10 km (figuur 2). 9. Birds ringed in Deelerwoud were not retrapped north of the line Zeewolde (Flevoland). Meppel, Lingen (Germany). This is not due to a lack of nest boxes and observators in the three northern provinces. 10. It has been concluded that females Pied Flycatchers did not disperse further from Deelerwoud than 100 km in 23 years in northern direction.