| Titre : | Nightingales Luscinia megarhynchos, Thrush Nightingales L. luscinia and their hybrids in the area of Frankfurt (Oder) - further results of long-term investigations using bird ringing. |
| Auteurs : | Joachim Becker, Auteur |
| Type de document : | Article |
| Dans : | Vogelwarte (45(1) FEB 2007) |
| Article en page(s) : | 15-26 |
| Langues: | Allemand |
| Résumé : | Within the scope of a bird ringing program, abundance and constitution of broods of mixed pairs and backcrosses between Nightingales Luscinia megarhynchos and Trush Nightingales Luscinia luscinia were studied in the area of their joint occurrence Frankfurt (Oder) between 1990 and 2005. 2,389 Nightingales, 482 Thrush Nightingales, and 207 Hybrids (ever approx. 50% nestlings) were marked. A high fidelity to the breeding place was denoted. Birds were examined up to 10 years at the same place. Generation orders of some of them are illustrated and 4 offsprings of ring-known pairs of mixed parents are described. 40 broods of mixed pairs, 31 backcrosses and polygyny in Nightingale, Thrush Nightingale and one hybrid were documented. The proportion of species-pure broods (83.7%), broods of mixed pairs (9.2%) and backcrosses (7.1%) remained relatively constant in the period of examination. A displacement of one by the other species or increasing hybridisation rate of both species was not observed. All hybrids have been males being partly able to reproduce. A F1-hybrid-female could not be noticed. Almost all Nightingales sung normal species'songs. More than 50% of the Thrush Nightingales imitated the Nightingale male song in a more or less good way. The kind of singing of the males of both species appears to be of minor importance with respect to finding a female for breeding. They do not hamper hybridisation. However, the species status is clearly justified despite of their close relationship. |
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