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Article
U. Marxmeier, Auteur ; H. Duttmann, AuteurIn the beginning of the 90s the breeding population of the Great Crested Grebe on the hypertrophic shallow Lake Dimmer decreased from almost 400 pairs to about 40-120 pairs. We addressed the question of whether this decrease was due to changes i[...]
Article
H. Duttmann, Auteur ; S. Dieleman, Auteur ; T. G. G. Groothuis, AuteurDans Ardea (87(1) 1999)We investigated effects of testosterone treatment on timing and rate of moult of wing-feathers in male Shelducks Tadorno tadorna, and whether this treatment influences the timing of moult in untreated females. Three experimental treatments were [...]
