La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	The Pygmy Owl Glaucidium passerinum in the Swiss Jura mountains. (2016)
Auteurs :	Pierre Henrioux, Auteur ; Jean-Daniel Henrioux, Auteur ; Pierre Walder, Auteur ; Fabienne Henrioux, Auteur
Type de document :	Article
Dans :	Alauda (84(4) 2016)
Article en page(s) :	253-266
Résumé :	The Pygmy Owl Glaucidium passerinum has been surveyed in the Swiss Jura Mountains for 20 years. We recorded 208 cavity trees, of which 50 were occupied by the owl. A total of 106 nests were found where we collected datas about the breeding biology. One to 10 pairs were regularly nesting with no increasing trend over the years. This is contrary to the increased number of fledglings that we observed and which seems to be the result of a greater average clutch size. We have ringed 260 chicks and 36 females. From the letters, 16 have been controlled half part at the same place, half part at a distance of less than 1100 m from the first capturing point.The effect of habitat variables on nest site selection was explored by comparing 50 occupied cavities with 158 non-occupied ones. The Pygmy Owl seems to prefer the healthy trees or those in a declining health condition. The owl also selects cavities with small entrance holes in firs. The surrounding of all cavity trees is typical of that of old forests. Our analyses allow us to suggest some management tools in order to protect the habitat of this owl.

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