Distribution, abundance, breeding parameters, threats and prey preferences of the eastern imperial eagle (Aquila heliaca) in European Turkey

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During the period 2008-201 3, 32 different breeding territories were occupied by eastern imperial eagles (EIEs). These territories were mainly distributed in two regions: the Dervent Heights/Yıldız Mts. and the area to the north of the Marmara sea coast. The nearest neighbour distance established was 4.2 km. The mean distance between pairs was 1 0.44±2.95 km. The mean value of breeding success for the period 2008-201 3, including 1 07 cases of incubation, was 1 .01±0.1 0. The mean breeding success of birds in the Marmara region (1 .05±0.78) was higher than that in the Dervent Heights/Yıldız Mts. (0.91±0.84). The present study on the diet of the EIE was based on the remains of 582 prey items of at least 70 taxa. Mammals were the most common group (46.5%), followed by birds (32.4%) and reptiles (20.3%). The white-breasted hedgehog (Erinaceus roumanicus) was the most common prey, followed by two tortoises - Hermann's tortoise (Eurotestudo hermanni) and the Greek tortoise (Testudo graeca) - which together accounted for a total of 1 4.4% of the prey caught. The prey species particularly represented in the food spectrum of the studied pairs were: the yellow-legged gull (Larus michahellis), the European souslik (Spermophilus citellus), the chicken (Gallus gallus f. domestica) and the white stork (Ciconia ciconia). These species together accounted for 67.8% of the prey caught. There was a statistically significant difference (Z=2.52, p=0.01 ) in the food preferences of the EIEs in the two studied regions.

Andersen DE 2007: Survey techniques, 89-1 00. In: Bird DM & Bildstein KM (eds): Raptor research and management techniques. Hancock House Publishers, Surrey, Canada & Blain, WA, USA, 464.

Aulagnier S, Haffner R, Mitchell-Jones A, Moutou F & Zima J 2009: Mammals of Europe, North Africa and the Middle East. A&C Black Publishers Ltd., Paris, 272.

Beshkov V & Nanev K 2002: Zemnovodni i vlechugi v Balgariya [Amphibians and reptiles in Bulgaria]. Pensoft publishing house. Sofia, 1 20. [In Bulgarian]

Bibby C, Jones M & Marsden S 1 999: Expedition field techniques. Bird surveys. Royal Geographical Society, London, 1 37.

Boev Z 1 986: Sravnitelno-morfologichni prouchvaniya na chaplite (sem. Ardeidae - Aves) ot Balgariya [Comparative morphological studies on herons (fam. Ardeidae - Aves) from Bulgaria]. PhD thesis. University, Sofia, 1 93. [In Bulgarian]

Böhme W 1 993: Äskulapnatter (E. longisima Laurenti 1 768), 331-372. In: Böhme W (ed), Handbuch der Reptilien und Amphibien Europas. Aula Verlag, Weisbaden, 479.

Chavko J, Danko Š, Obuch J & Mihók J 2007: The food of the imperial eagle (Aquila heliaca) in Slovakia. Slovak Raptor Journal 1 : 1-1 8. DOI: 1 0.2478/v1 0262-01 2-0001 -y.

Demerdzhiev D 2011 : Iztochniyat tsarski orel (Aquila heliaca heliaca Savigny, 1 809) (Accipitridae - Aves) v Balgariya - razprostranenie, biologiya, ekologiya, chislenost i merki za opazvane [Eastern imperial eagle (Aquila heliaca heliaca Savigny, 1 809) (Accipitridae - Aves) in Bulgaria - distribution, biology, ecology, numbers, and conservation measures]. Synopsis of the PhD. thesis. BASNMNH, Sofia, 39. [In Bulgarian] Demerdzhiev D, Horváth M, Kovács A, Stoychev S & Karyakin I 2011 .: Status and population trend of the eastern imperial eagle (Aquila heliaca) in Europe in the period 2000-201 0. Acta zoologica Bulgarica Supplementum 3: 5-1 4.

Demerdzhiev D, Gradev G, Stoychev S, Ivanov I, Petrov T & Marin S 201 1 b: Increase of the population of the eastern imperial eagle (Aquila heliaca) in Bulgaria. Acta zoologica Bulgarica Supplementum 3: 41 -54.

Demerdzhiev D, Stoychev S, Terziev N & Angelov I 2011 c: Status of the eastern imperial eagle (Aquila heliaca) in the European part of Turkey. Acta zoologica Bulgarica Supplementum 3: 87-93.

Demerdzhiev D, Stoychev S, Dobrev D, Spasov S & Terziev N 2014: Undertaken conservation measures improving the population status of eastern imperial eagle (Aquila heliaca) in Bulgaria. Slovak Raptor Journal 8(1 ): 27-39. DOI: 10.2478/srj-2014-0007.

Dunning J (ed) 2008: Handbook of avian body masses. CRC Press, Taylor & Francis Group, 655.

Forsman D 2005: Eastern imperial eagle plumages. Alula 4: 1 47-1 52.

Gursan M & Bilgin C 2002: The status of the imperial eagle (Aquila heliaca) in Turkey. Aquila 1 07-1 08: 1 87-1 92.

Horal D 2011 : Eastern imperial eagle Aquila heliaca in the Czech Republic. Acta Zoologica Bulgarica Supplementum 3: 55-59.

Horváth M, Szitta T, Firmanszky G, Solti B, Kovács A & Moskat C 201 0: Spatial variation in prey composition and its possible effect on reproductive success in an expanding eastern imperial eagle (Aquila heliaca) population. Acta Zoologica Academiae Scientiarum Hungaricae 56(2): 1 87-200.

Isfendiyaroglu S 201 2: Türk Trakya’da Dogu sah kartal (Aquila heliaca Savigny, 1 809) üzerinde arastırmalar [Investigations on eastern imperial eagle (Aquila heliaca Savigny, 1 809) in Turkish Thrace]. Master thesis. Istanbul University Institute of Sciences, Istanbul. [In Turkish]

Katzner T, Bragin E, Knick S & Smith A 2005: Relationship between demographics and diet specificity of eastern imperial eagle Aquila heliaca in Kazakhstan. Ibis 1 47: 576-586. DOI: 1 0.1111 /j.1 474-91 9X.2005.00443.x.

Kirwan G, Boyla K, Castell P, Demirci B, Ozen M, Welch H & Marlow T 2008: The birds of Turkey. The distribution, taxonomy and breeding of Turkish birds. Christopher Helm, London, 51 2.

Kunstmüller I 2000: The food ecology and the diet composition of eagle owl (Bubo bubo) at the breeding sites in the Bohemian-Moravian highlands, Czech Republic. Crex 1 6: 50-59.

Mayer H & Aksoy H 1 986: Waelder der Türkei. Gustav Fischer, Stuttgart, 275.

Natcheva R, Coskun M & Çayır A 2008: Contribution to the bryophyte flora of European Turkey. Phytologia Balcanica 1 4(3): 335-341 .

Petrov P. 1 964: Variabiolnost v tegloto na zaeka (Lepus europaeus, Pall.) v Balgariya [Variability in the weight of common hare (Lepus europaeus, Pall.) in Bulgaria] . Forestry science 1 (4): 73-81 . [In Bulgarian]

Shapiro S, Wilk M & Chen H 1 968: A comparative study of various tests of normality. Journal of the American Statistical Association 63: 1 343-1 372. DOI: 1 0.1 080/01 621 459.1 968.1 0480932.

Simeonov S, Michev T & Nankinov D 1 990: Fauna na Balgariya. T 20, Aves, 1 [Fauna of Bulgaria. T 20, Aves, 1 ]. BAS, Sofia, 350. [In Bulgarian]

Simeonov S & Petrov T 1980: Prouchvane varhu hranata na krastatiya orel (Aquila heliaca Savigny), obiknoveniya mishelov (Buteo buteo L.) i gashtatiya mishelov (Buteo lagopus Brünnich) v Balgariya [Study on food spectrum of imperial eagle (Aquila heliaca Savigny), common buzzard (Buteo buteo L.) and rough-legged buzzard (Buteo lagopus Brünnich) in Bulgaria]. Ecology 7: 22-30. [In Bulgarian]

StatSoft 2004: STATISTICA (data analysis software system), version 7. www.statsoft.com.

Warncke K 1 966: Erganzungen zu meinen vogelkundlichen Beobachtungen in der Turkei. Vogelwelt 87: 1 88-1 89.

Warncke K 1 968: Nachwinterliche Beobachtungen an turkischen Brutvogeln. Vogelwelt 2: 89-1 02.

Wichmann G 2011 : The situation of the eastern imperial eagle Aquila heliaca in Austria. Acta Zoologica Bulgarica Supplementum 3: 37-40.

Wirth H 1 996: Breeding record of the imperial eagle, Aquila heliaca, in Turkey. Zoology in the Middle East 1 2: 47-52. DOI:1 0.1 080/093971 40.1 996.-1 0637687.

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