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- Title
Exceptionally Low Proportion of Adult Pairs and Male-Skewed Adult Sex Ratio in a Declining Population of the Golden Eagle Aquila chrysaetos (L., 1758) (Accipitriformes: Accipitridae).
- Authors
Angelov, Ivaylo D.
- Abstract
Generally, golden eagles have a favourable conservation status but they are threatened in some parts of their range. A nationwide breeding survey of the golden eagles in Bulgaria found that the species is in a decline. Contrary to the last estimation for 212 pairs, only 93 territories were found occupied while 81 were vacant. Only half of the pairs were in adult plumage and the other half had at least one of the members in non-adult plumage. The adult sex ratio was biased towards males (1.31 males per female), with the male older in 26 out of 33 territories, where the birds differed in their age classes. The obtained results could be explained by a very high unnatural mortality of territorial birds.
- Subjects
BULGARIA; GOLDEN eagle; FALCONIFORMES; SEX ratio; ADULTS; DEMOGRAPHIC change; ANIMAL offspring sex ratio; FEATHERS
- Publication
Acta Zoologica Bulgarica, 2024, Vol 76, Issue 2, p241
- ISSN
0324-0770
- Publication type
Article