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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Breeding biology of Hazel Grouse Bonasa bonasia in the Southeastern French Alps (second part) (2011)
Auteurs :	Marc Montadert, Auteur ; P Léonard, Auteur
Type de document :	Article
Dans :	Alauda (79(1) Janvier, 2011)
Article en page(s) :	89-99
Résumé :	Breeding biology of 29 radio-tracked Hazel Grouse hens was investigated from 1999 to 2008 in the south-eastern part of French Alps. Spring home range of females up to incubation sized from 7.6 to 31.1 ha (50% activity range covered 2.5-9.4 ha, Kernel method). First clutches were 7.3 (range: 6-9) eggs and second clutches were 3.7 (range: 3-4) eggs in average. Hatching period extended from 23 May to 4 July, the median date for first clutches was 4 June and that for second clutches was 25 June. Nesting success was estimated by the Mark software capture-recapture method. Breeding success from the beginning of laying to hatching was 0.34 for all nests (first and second clutches together) and 0.46 during the incubation period. Nest loss was mainly, if not entirely, due to predation, probably by carnivores. 15% of the hens did not initiate a clutch but this rate was probably biased by undetected early destroyed clutches. If these hens were taken into account, breeding success was 0.28. Nest loss was not influenced by hen's age, nest visibility, distance to roads and laying date. Breeding success was significantly higher in the first study years (0.55 in 1999-02) than subsequently (0.22 in 2004-08). Reproduction traits (clutch size, nesting success) of this population appeared relatively low when compared to other studies on Hazel Grouse. Results are discussed in relation to the adaptive value of clutch size and to the role of environmental factors on breeding success.

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