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pro vyhledávání: '"N. V. Kudryavtsev"'
Publikováno v:
Russian Journal of Ecology. 41:256-263
The gyrfalcon in the Yamal Peninsula nests mostly on trees. The average brood size in this species decreased from 3.1 nestlings per active nest (n = 28) between 1973 and 1989 to 2.2 (n = 22) between 1998 and 2008. This decrease is probably explained