Abstract
The blackfly distribution patterns along the meridional profile for the Ob-Irtysh River basin area have been analyzed with the use of long-term quantitative data. Ninety-six species of nine genera, comprising approximately 60% of the fauna in Siberia and the Far East, are recorded. The spatial pattern formation in the blackfly zonal structures is revealed. There are significant differences between blackfly populations in highland and lowland landscapes. In the highlands, the communities confined to different altitudinal belts are formed. In the lowland of the basin, three community zonal types—steppe, taiga–forest, and tundra—are identified. Significant climatic factors affecting the heterogeneity of the blackflies in the Ob-Irtysh River basin have been estimated.
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