La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	2015 was an exceptional year for the Tawny Owl Strix aluco in Burgundy (2017)
Auteurs :	H Baudvin, Auteur ; R Hezard, Auteur ; D Joliet, Auteur ; G Olivier, Auteur
Type de document :	Article
Dans :	Alauda (85(1) janvier 1, 2017)
Article en page(s) :	109-117
Résumé :	393 nestlings were ringed in 2015 showing the best breeding success since the beginning of the study in 1980 (for comparison 65 young were ringed in 2013 and 240 in 2014). All the 10 forests studied except one contributed to this success (high percentage of occupied nestboxes, high num-bers of captured and controlled adults). In that year, among the 312 studied nestboxes, 196 were occupied by Tawny Owls, 31 by Pine Martens Martes martes, 8 by Squirrel Sciurus vulgaris and 1 by Wild Cat Felix sylvestris with young. 220 adults have been captured, about three quarters of them were already ringed. 6 controlled adults were at least 15 years old. The mean age of the controlled bids were of 6.36 years. 27 individuals ringed as nestlings were controlled for the first time as adults. Since 1980,1373 adults and 5990 young were ringed. 143 started broods gave 2.76 young and the size of 111 successful broods was of 3.55 young. The mean laying date is on 22 February. More than 80 % of preys were woodmice Apodemus sp. and Bank Voles Myodes glareolus. The pop-ulation status did not follow the same trend in the different forests. We now need to study the reasons for this difference.

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