INDIRECT INFLUENCE OF THE NUMBER OF MOUSE-LIKE RODENTS ON THE NUMBER OF GALLIFORMES
Abstract and keywords
Abstract (English):
In the Omsk region, the role of seventeen species of predatory animals on the population dynamics of twenty species of small, mouse-like rodents ranges from negligible for the river otter to significant for the pine marten, Siberian weasel, light polecat, wolverine, red fox and raccoon dog. The variability of the numerical relationships between populations of predatory animals and small mouse-like rodents based on the Pearson correlation coefficients (−0.15==0.15; p<0.05) can manifest through selective elimination leading to a decrease in the number of rodents or through non-selective elimination without changing the overall rodent population or with a decrease in the number of individual species, a limited number of species, or most species of rodents. The most substantial impact of antiphase changes on the population size of wild Galliformes, comprising nine subspecies of seven species is attributed to the population sizes of a limited number of small rodent species: the northern red-backed vole, root vole, water vole, and, to a lesser extent, the narrow-skulled vole and striped field mouse. The population sizes of other rodent species do not play a decisive in these changes. The greatest impact is experienced by the population size of the white-bellied wood grouse, forest black grouse, steppe black grouse, and, to a lesser extent, the Siberian hazel grouse, great willow ptarmigan, grey partridge, and common quail, the population densities of which fluctuates inversely with those of small mouse-like rodents.This study demonstrates the fact of the indirect influence of rodent populations, changing under the influence of various predatory mammals, which vary in their impact, on the populations of wild gallinaceous birds as components of a multifactorial system in an area with different biotopic conditions.

Keywords:
conjugate long-term abundance; predatory animals; rodents; wild gallinaceous birds, Omsk region.
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