1. bookVolume 8 (2014): Issue 2014 (January 2014)
    Proceedings from VII. International Conference on the Conservation of the Eastern Imperial Eagle, Bratislava, Slovakia, 2013
Journal Details
License
Format
Journal
eISSN
2644-5247
ISSN
1337-3463
First Published
09 Nov 2012
Publication timeframe
1 time per year
Languages
English
access type Open Access

Conservation measures undertaken to improve the population status of eastern imperial eagle (Aquila heliaca) in Bulgaria

Published Online: 26 Mar 2014
Volume & Issue: Volume 8 (2014) - Issue 2014 (January 2014) - Proceedings from VII. International Conference on the Conservation of the Eastern Imperial Eagle, Bratislava, Slovakia, 2013
Page range: 27 - 39
Journal Details
License
Format
Journal
eISSN
2644-5247
ISSN
1337-3463
First Published
09 Nov 2012
Publication timeframe
1 time per year
Languages
English
Abstract

This study presents the results of conservation measures undertaken and their impact on the eastern imperial eagle population in Bulgaria. The species is distributed in the south-eastern part of the country, as there is only one known pair in central Bulgaria. During the period 2009-201 3, 28 different breeding territories were occupied. The population increased by 20%, as the number of pairs that occupied breeding territories increased from 20 in 2009 to 24 in 201 3. In general, the mean values of the breeding parameters of the eastern imperial eagle population for the period 2009-201 3 were as follows: productivity (P) 1 .03±0.1 8; breeding success (BS) 1 .1 8±0.21 ; and fledgling success (FS) 1 .68±0.1 6. The annual survival rate of breeders varied from 0.795 to 0.932. The most important factor causing the mortality of immature eagles was electrocution. Shooting and poisoning have become important mortality factors, too. Guarded pairs had a higher mean breeding success (1 .32±0.88) than non-guarded pairs (1 .06±0.91 ). As a whole, 39% of all artificial nests installed in the period 2009-201 3 were occupied by birds of different species. During the period 2008-201 3, a total of 23 juvenile eastern imperial eagles were tagged with satellite/GPS transmitters. In addition, 608 hazardous electric poles in the territories of seven pairs were insulated. Supplementary feed was provided for 1 4 pairs once a week during the autumn-winter seasons (October - March). A total of 483 supplementary feedings took place, 450 ofwhich also included monitoring in order to record the effectiveness of this activity.

Keywords

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