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Résumé :
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Drost (1936) categorized the breeding plumage of male Pied Flycatchers (Ficedula hypoleuca) into seven colour types with a variation which ranges continuously from dorsal completely black (type I) to fully brown or greyish brown (type VII). This classification was used in our investigation. The evaluation is based on findings from 1974 to 2003 in a nestbox study plot near Lingen/Emsland (52.27 N, 7.15 E) in western Lower Saxony/Germany. 87% of all registered males (n = 1975) could be associated with the two lightest colour types VII and VI, and only 4% of males were +- dark coloured (type IV or darker). In the dark coloured males usually no resemblance could be found between social father and son with respect to breeding plumage. - During the investigation period no significant change in mean male dorsal coloration was established (1974 to 1988 = type 6,39 on average, 1989 to 2003 = type 6,48, all years = type 6,43). One-year-old males were on average significantly browner than older males (type 6,84 and 6,29 respectively). Males from western Lower Saxony (Lingen population) did not differ with regard to their breeding plumage if compared to males from eastern Lower Saxony (Brunswick population, Winkel et al. 1970).
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