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Premiers resultats Sur la biologic de reproduction du Vautour moine Aegypius monachus en France


, : Premiers resultats Sur la biologic de reproduction du Vautour moine Aegypius monachus en France. Alauda 75(3): 253-264

Black Vulture Aegypius; monachus has been reintroduced in the Grands Causses, Southern France, between 1992 and 2004. A pair bred for the first time in 1996. The breeding population has gradually increased and 16 pairs were breeding in 2006. This paper describes the main breeding parameters for this reintroduced population. In 2006, a cluster of 11 nests in two loose colonies could be found in in the Jonte Canyon, with the 5 other nests spreading between the Tarn Canyon and Valley, in a 90-km(2) area. Nests are all built on Scots Pine on top of wooded slopes. The average laying hatching and fledging dates were respectively 5(th) March, 1(st) May and 20(th) August. The mean age of first breeding was 4.4 years. The mean breeding success was 0.52 for the period 2000-06 but tended to stabilise and increase as pairs were becoming more experienced. The duration of use of a nest site was positively correlated with fledging success. Failure mostly occurred during incubation and could be linked with weather conditions, human disturbance or sterility but the causes of most failures are unknown. Although, initially made up of young released birds, the, Grand Causses breeding population displays, breeding phenology and ecology similar to that of other natural populations in Europe. While breeders are ageing and gaining experience, we expect an increase in the number of pairs in the area in the coming years.

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