Ecological and geographical analysis of the ornithocomplexes of the Tobol-Irtysh forest-steppe and the steppe of Western Siberia and Northern Kazakhstan in the first half of summer
S. A. SOLOVIEV1, L. G. VARTAPETOV2
1F. M. Dostoevsky Omsk State University, Omsk, Russia
2Institute of Systematics and Ecology of Animals SB RAS, Novosibirsk, Russia
Keywords: birds, ornithocomplexes, cluster an alysis, environmental factors, correlation
Abstract
According to the results of bird counts carried out in 140 habitats over 12 years, in the period from 1982 to 2002 drawn up hierarchical classification and a structural graph of the similarity of ornithocomplexes in the plain southwestern part of Western Siberia and Northern Kazakhstan have been compiled. The hierarchical classification contains 10 types of bird populations. The similarity graph is built at the level of types and is represented by three rows (trends). One row consists of bird complexes of residential and recreational areas, the second from wetlands and the third from forest, forest-field and steppe habitats. The given characteristics of taxa of classifications contain information on the three most numerous bird species (leaders in abundance), their share in the community, population density, and also on the background species richness. Based on the assessment of the degree of coincidence of the similarity of bird communities and environmental factors, a hierarchy of the impact of the main anthropogenic and natural factors determining the formation of the bird population has been established.
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