Пространственно-типологическая Структура И Организация Населения Птиц Тоболо-Иртышской Лесостепи И Степи Западной Сибири И Северного Казахстана Во Второй Половине Лета.

According to the results of bird counts carried out in 138 habitats over 12 years, a 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 in the period from 1982 till 2002. The hierarchical classification contains six 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, of wetlands; and the third, of forest, forest-field, and steppe habitats. The classification taxa characteristics contain information on the three most numerous bird species (leaders in abundance), their share in the community, population density, and the background species wealth. Based on the assessment of the similarity coincidence degree for the of bird communities and environmental factors, a hierarchy of the impact of the main anthropogenic and natural factors, determining the bird population formation, has been established.