Archive for July, 2011

Monitoring of the White-tailed Eagle population in the Middle Dnieper area

Tuesday, July 19th, 2011 Posted in Monitoring | No Comments »

Monitoring of populations of rare Falconiformes is an important tool to organize protection of these birds. For this purpose we have developed the Monitoring Programme for the Birds of Prey of Ukraine. One of the Programme directions is long-term tracking of the White-tailed Eagle population.

We initiated the monitoring of the White-tailed Eagle population in 1992. That time numbers of this rare raptor in the Dnieper valley just started to restore and a discovery of every nest was a big event. Each year and expedition after expedition the territory of our studies expanded, and the numbers of the White-tailed Eagle also increased. At present, we know approximately 50 breeding sites of the White-tailed Eagle within regions of Chernihiv, Kyiv, Cherkasy, Kirovohrad and Poltava.

Annual monitoring includes occupation control of known breeding sites, search for new pairs, control of breeding success and productivity, organization of protection for breeding sites.
Results of these studies were reflected in a dissertation (PhD thesis) (Gavrilyuk 2002), and in individual publications (Gavrilyuk, Grishchenko, 1999; Gavrilyuk, Grishchenko, 2000; 2008 etc.). Over the 19 years we tracked 111 breeding cases. It is established that the average breeding success is 74%, i.e. approximately ¼ pairs breed successfully. Mostly the reason of unsuccessful breeding is hard to find out, however we know cases when these eagles did not breed chicks because of forestry activity in their breeding period or human disturbance.

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