Undertaken conservation measures improving the population status of Eastern Imperial Eagle (Aquila heliaca) in Bulgaria Dimitar Demerdzhiev, Stoycho Stoychev, Svetoslav Spasov, Dobromir Dobrev and Nikolay Terziev
•Occupied territories and breeding pairs 28 different breeding territories were occupied the population increased by 20%,24 p. in 2013 Number of territories occupied by pairs Number of pairs start incubating 30
pairs
25 20 15 10 5 0 2008
2009
2010
2011 years
2012
2013
Age structure of the Imperial Eagle population
0.18
0.08
BS
5.00 1.18
0.92
1.44
0.89
1.47
0.04
0.21
0.09
FS
5.00 1.68
1.49
1.88
1.54
1.90
0.03
0.16
0.07
Stand
0.03
ev.
1.19
ce
0.74
mum
1.26
Maxi
0.81
00% mum
5.00 1.03
The breeding success increased by 16.8% compared to the previous study period (20002009)
ard
Std.D
Varian
0 % +95,0 Mini
95,00 dence
-Confi
Confi
P
Variable
Valid
N Mean
dence
•Brood size, productivity, breeding success, fledgling success, success rate
The broods with 2 chicks increased
Annual replacement of breeders increased over the years
Mortality
Eggs
Chicks
Infertlity
6; 32%
Desturbance
1; 5%
Storm
1; 5%
3; 11%
Nest robbing
5; 26%
2; 8%
Unknown factors
6; 32%
6; 23%
Starvation
5; 19%
Kainism
2; 8%
Dropping from the nest
6; 23%
Predation
2; 8%
Mortality of juvenile and immature n= 15
•Nest guarding 31 breeding attempts were guarded The guarding of nests increased by more than 35 % the breeding success of the “risky” pairs
Build and install artificial nests
36 artificial nests Imperial Eagle - 3 newly formed pairs; Long-legged Buzzard - 7 nests; Common Buzzard - 1 nest; Hobby - 1 nest; Black Stork - 2 nests.
Restore Imperial Eagle nesting habitat
A total of 5430 poplars planted in an area of 132 ha
Winter supplementary feeding
for 14 Imperial Eagle pairs
Summer supplementary feeding for twenty-two breeding pairs
Insulate electricity poles 561 electric poles in the territories of 7 Imperial Eagle pairs
Land purchase ďƒź15 ha of riparian habitats ďƒź60 ha of foraging habitats
Satellite tagging
23 birds in Bulgaria, 2 birds in the European part of Turkey
Establishing a new agri-environmental scheme
Education and PR
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