La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Video analysis as a method for examining feeding biology of the Eurasian Eagle Owl Bubo bubo
Auteurs :	Jesper Stern Nielsen, Auteur ; Joachim Westergaard Lassen, Auteur ; Trine Bork Larsen, Auteur ; Helene Overgard, Auteur ; Iben Hove Sorensen, Auteur ; Klaus Dichmann, Auteur ; Peter Sunde, Auteur
Type de document :	Article
Dans :	Dansk Ornitologisk Forenings Tidsskrift (109(4) 2015)
Article en page(s) :	161-166
Résumé :	Live streaming from bird nests has become increasingly popular for educational purposes, but may also hold a research potential by enabling direct observations of food provisioning and social interactions, We used video recordings from an Eagle Owl nest to investigate diet composition and prey delivery patterns as a function of date, time of day and weather. A total of 72 deliveries were observed with 41 prey items (57%) being identified to species and 18 (25%) to a higher taxonomic group. Birds accounted for 22 individuals (37%) and mammals for 37 individuals (63%). We found a significant positive correlation between biomass delivered per time unit and chick age, whereas the number of prey deliveries per time unit decreased with chick age, but increased with wind strength. We conclude that live-streams can provide much information on the feeding biology of owls and serve as an alternative to pellet analysis in studies of diet composition.

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...