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—Data on the distribution, numbers, and breeding biology of the Gyrfalcon (Falco rusticolus) were collected in the tundra and forest-tundra of European Russia, the Polar Ural mountains, and Yamal Peninsula from 1982 to 2009 (excluding 2003). Extensive coverage of the region and systematic monitoring of the species breeding at the interface of lowland and mountain tundra, as well as forest-tundra, allowed me to define the most crucial factors contributing to population persistence. Among those were 1) high numbers of prey, most importantly Willow Ptarmigan (Lagopus lagopus), especially at the beginning of the breeding season, 2) the presence of other bird species providing ready-made nests, and 3) the availability of suitable nesting substrate (rock cliffs, trees, or their anthropogenic analogues). Received 17 March 2011, accepted 26 April 2011. MOROZOV, V. V. 2011. Ecological basis for the distribution and breeding of Gyrfalcons in the tundra of European Russia and preconditions for spreading to new grounds. Pages 229–238 in R. T. Watson, T. J. Cade, M. Fuller, G. Hunt, and E. Potapov (Eds.). Gyrfalcons and Ptarmigan in a Changing World, Volume II. The Peregrine Fund, Boise, Idaho, USA. DOI 10.4080/gpcw.2011.0222

Ecological Basis for the Distribution and Breeding of Gyrfalcons in the Tundra of European Russia and Preconditions for Spreading to New Grounds.