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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The May diet of Capercaillie (Tetrao urogallus) in an extensively logged area of NW Russia
Auteurs :	Vladimir Borchtchevski, Auteur
Type de document :	Article
Dans :	Ornis Fennica (86(1) 2009)
Article en page(s) :	18-29
Langues:	Anglais
Résumé :	The May crop contents of Capercaillie (Tetrao urogallus) from a highly disturbed (logged) area of NW Russia are documented for the first time. Plants of the tree-shrub layer and bog plants of the field layer together formed the main part of the diets of both cocks (75% of fresh weight) and hens (58%). Fragments of pine (Pinus sylvestris) and bilberry (Vaccinium myrtillus) were more abundant in crops of cocks, whereas hens consumed more young herbaceous shoots and track-side plants. Hens also garnered spruce seeds (Picea spp.) from tracks. Track-side food items formed up to a third of the diet of hens. These included shoots of clover (Trifolium spp.) and especially flower buds of coltsfoot (Tussilago farfara). Complete elimination of some forest tracks, as a management technique for Capercaillie, could result in a loss of food sources important to hens in most of their Eastern-European range. The closure of tracks from people and vehicles, and their conversion to habitat where spring-blooming plants for hens abundantly grow, seems a more viable conservation option. Even in a highly disturbed area, plants of the native taiga biotopes composed almost all the diet of cocks (ca. 97%). Compared to the cocks, the feeding strategy of hens was more opportunistic; hence, their spring diet may be less vulnerable to logging perturbations.

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