Ponomarenko A. Consortive relationship of birds in oak-forests of steppe Dnieper region as a factor of forest ecosystems sustainability.

OObject is the birds, as consorts of trees in oak-forests of steppe forests of Ukraine. The aim is to study the legitimacies of formation the consortive relationships system of birds, as a structurally functional members of forests biogeocenoses of steppe zone of Ukraine. Methods - methodological approaches to research of the consortive relationships, methodical receptions of research the activity of of birds. The process of forming the system of consortive relationships of birds in the individ-ual consortia of four trees: oak Quercus robur, ash Fraxinus excelsior, lime Tilia cordata, maple Acer campestre was studied. The variability of bird-consorts species of the trees and their daily activity cycle in oak forests with lime and ash in the Samara-river region were revealed. 40 bird species and 11 types of bird-consortia core interaction were found during the year. The relationships are mostly topic and trophic. Phoric relationships of birds have an observable seasonal dynamics. Phabric relationships are mediate and not numerous. With change of the consortium core age from virgin to mature and old generative age the time budget of consortive relationships of birds increases 5-20 times depending on tree species and age. The bird species number also increase from 1-2 to 27. Stabilization of the system of consortive relationships of the birds with the oak, ash, maple and lime occurs at the age condition "g1". Seasonal dynamics of species composition, activity and spatial dis-tribution of the bird-consorts in the trees individual consortia were determined. The consortium of the oak has most diverse functional groups of the birds. Bird's functional composition in consortia is characterized by prevalence of dendrophiles and sig-nificant fluctuations of the ratio of yearlings and seasonal species. Zoophages are dominants amongst trophomorphs. Transformation processes of the system of consortive relationships of the birds in biogeocoenoses with anthropogenic pressure were studied. Sphere - preservation and recovery of populations of miscellaneous kinds of birds, training courses.