The gyrfalcon, <Emphasis Type="Italic">Falco rusticolus</Emphasis>, in the Yamal Peninsula: Dynamics of brood size and nest size over the years 1973–2008 |
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Authors: | S A Mechnikova M S Romanov V N Kalyakin N V Kudryavtsev |
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Institution: | 1.Moscow City Pedagogical University,Moscow,Russia;2.Institute of Mathematical Problems of Biology,Russian Academy of Sciences, Pushchino State University,Pushchino, Moscow oblast,Russia;3.Moscow,Russia |
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Abstract: | 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 by switching to the habit of using mostly smaller nests
(built by the rough-legged buzzard, raven, or hooded crow) instead of large nests built by the white-tailed eagle. The survival
rate of gyrfalcon nestlings in smaller nests is considerably lower: the average brood size is only 1.6 (n = 12), compared to 2.5 (n = 20) in medium-sized and 3.0 (n = 34) in large nests. The possible role of increase in snow cover density caused by climate warming in making large nests
less accessible to the gyrfalcon is discussed. |
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