La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Selection of winter roosts in the Great Tit Parus major: influence of microclimate
Auteurs :	Marek Velky, Auteur ; Peter Kaňuch, Auteur ; Anton Krištín, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (151(1) JAN 2010)
Article en page(s) :	147-153
Langues:	Anglais
Résumé :	The success in energy saving in roosting Great Tits (Parus major) is potentially influenced by roost microclimatic characteristics. We tried to learn about the pattern in cavity microclimate influence on night roosting of birds, under natural weather conditions. An experimental aviary offered two artificial tree-roosts with different microclimatic conditions which varied according to the outdoor conditions (mainly due to solar radiation) and microclimate retention capability of roosts. Birds actively explored roosts before the final choice of sleeping site. Two hours prior to sunset, there were significant differences between the roosts (n = 11 adult males tested, each six nights). Selected roosts had higher average temperature (Wilcoxon matched pairs test, P = 0.017) and temperature at the time of sunset (P = 0.028). Simultaneously, inside temperature decreased slowly (P = 0.047). During the night, when birds slept in one of the roosts, the average temperature was higher (P

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