Atemasova T. Avifauna as a structural component of biogeocenosis at Northern-East of Ukraine.

The object is the nesting birds of representatives of the class Aves. The aim is to study the ecological and faunal characteristics avifauna at Northern-East of Ukraine as a structural element of common biogeocenoses. The methods are multiple mapping; dot records; route records; Finnish line transects. The results of nesting birds populations structure investigations at the typical biogeocenosis of North-East of Ukraine are presented. The composition of indication faunistic cores for all biogeocenosis bird populations described. The vulnerable of communities are estimates. A causal of rarity species was analyzed; it caused by native (biogeography, ecology and climatic) and anthropogenic reasons. An ornis representativeness of native reserve system analyzed. Application spheres are the project of nature reserves and training courses.