Home – Home – Jornals – Contemporary Problems of Ecology 2019 number 3

In 2013 and 2014 from May to July the bird individual nesting home ranges were regularly mapped along the permanent census route (3.15 km) in the dark-coniferous taiga on the southern slope of the Baikal lake bed. Based on the mapping results, for each bird species the nesting densities and average sizes of the bird individual nesting home range are estimated. Raster maps of spatial allocation (MSA) at the scale of the raster grid of 50 ´ 50 m are obtained for each species. The degree of spatial conservatism (DSC) for each local population is inferred from the pairwise comparisons of the specific MSAs obtained at the same area (31.5 hectares) in different years with the use of the Gamma rank correlation method. Dependence of the population habitat area on DSC was demonstrated earlier [Cherenkov, 2017]. The more habitat area is found, the less dependent the individual spatial allocation within a population is observed in the different years. Based on the specific habitat areas, average sizes of the individual nesting home range and nesting densities estimated, the maximum possible nesting density and habitat saturation are calculated for each species. The population status is inferred from the degree of habitat saturation. The significant DSC estimates ( p < 0.05) are obtained for nine species, their habitat areas and saturation are found. It is shown that habitat saturation in non-migratory birds is twice higher that in migratory ones 54-58 % versus 26 %, ( F = 9.1; p < 0.01). In the two species, the Orange-flanked Bush-robin Tarsiger cyanurus Pallas, 1773 and Taiga Flycatcher Ficedula ( parva ) albicilla Pallas, 1811, the habitat saturation is less than 20 % that indicates the presumably troubled status of their populations.