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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Life expectancy and causes of death of relocated Capercaillies Tetrao urogallus in Thuringia
Auteurs :	Christoph Unger, Auteur ; Siegfried Klaus, Auteur
Type de document :	Article
Dans :	Ornithologischer Anzeiger (48(1) JUL 2009)
Article en page(s) :	50-55
Résumé :	Life expectancy and causes of death of relocated Capercaillies Tetrao urogallus in ThuringiaAs compensation for damage to capercaillie Tetrao urogallus habitat in Thuringia, eastern Germany, through the construction of two new reservoirs, an electric power company was required to improve habitat in the area surrounding the dam and to implement a translocation experiment to supplement a small remnant population of capercaillies. Capercaillies were caught in autumn near Jaroslawl and Kostroma, 400-600 km NE of Moscow, central Russia. The birds were released after two weeks of quarantine in pens located within receptor habitats. 145 birds were released between 1999 and 2003. The sex ratio (males/females) was 1.2. The distribution of age classes of males resembled natural conditions: 38% were older than 2.5 years. The mean survival time of 33 marked birds was 286 days, ten times higher than captive-reared birds released in Thuringia. Survival of wild capercaillies (median 100 days, mean 286 days) was calculated from 33 birds, including 25 equipped with transmitters and of 8 other ringed individuals.Survival of captive-reared birds (median 17 days, mean 25 days) was obtained from 33 birds equipped with transmitters. The survival functions in Fig. 1 demonstrates: wild birds had about tenfold higher mean survival than captive-reared birds in the same release area and habitat in Thuringia. 15 wild males (75% of all losses, n=36) and 9 wild females (60%) were killed by red fox Vulpes vulpes and/or pine marten Martes martes. 3 males (15%) and 5 females (33%) were killed by goshawk Accipiter gentilis. The remaining losses were due to collisions with deer-fences (2 males, 1 female) and unknown causes. Reproduction by released birds was observed in 8 cases.

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