Forest biogeocenosis is a necessary environment for the normal existence of many species of wild animals, including birds. Recently, however, a gradual decrease in their numbers is observed in most forest areas of the Forest-Steppe zone. This indicator is one of the most important criteria for estimation of the general condition of this or that ecosystem. In this regard, specialists-zoologists, ornithologists, etc. pay great attention to the study of this issue (Koval' N.F. 1982). Currently, there is a quite extensive and often conflicting material regarding the number of birds. The most fundamental is the book by D. Lack, “The number of animals and its regulation in nature” (1957), which shows the influence of the food supply, the number of nesting places, “shelters”, and enemies on the reproductive ability, survival and general dynamics of the number of many bird species. Determining the breeding intensity of specific species populations of bird, we proposed to use the so-called productivity coefficient, which allows us to compare both the degree of biomass stability over the breeding period during a number of years and its geographical differences. The total number of birds on nesting can be different in various parts of the range under the influence of environmental conditions. The number of birds nesting on the ground and in the underwood has recently decreased significantly due to the large recreational burden of forest cenoses. Consideration of the dynamics of the number of daytime predatory birds and owls is of special attention. Their numbers have recently stabilized, although it continues to decline in some regions according to the available literary data. Ornithologists consider this mainly as a consequence of environmental pollution, killing of birds by humans, destruction of their habitats. The number of animal populations, for example, can vary significantly during the year or on average over the years. It is determined by the breeding rate and mortality of individuals. The breeding rate of birds is directly dependent on the size of egg laying, the success of eggs brooding and the percentage of flying out of viable young animals, which in total determines the success of breeding.


  • The number of birds in a particular biogeocenosis is quite stable under certain conditions during the breeding season

  • Impoverished state of recreational forests by birds occurs mainly due to the species nesting in the underwood, undergrowth, and on the ground (Koval' N.F. 1981)

  • There are various data regarding the dynamics of the number of predatory birds in the central European part

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The number of birds in a particular biogeocenosis is quite stable under certain conditions during the breeding season. It can change only with a radical change in environmental conditions. The total number of birds in broad-leaved forests of a certain region increases by 2.68 times on average under intensive breeding. The number of young couples can be very significant. The greatest species diversity of birds is noted, as a rule, in forests characterized by great floristic diversity. According to A.S. Malchevsky (1959), these include light broad-leaved forests with a predominance of oak, where at least 50% of the birds are cavity nesting birds, or mature broad-leaved and young forests at secondary serai stages. Great species diversity and bird numbers are observed near forest edges

Materials and Methods

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