La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Parental feeding and synchrony of behaviour of fledged White Storks Ciconia ciconia outside their nest
Auteurs :	Michael Fangrath, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (128(2) 2007)
Article en page(s) :	93-98
Résumé :	in a study of the behaviour of 13 pairs of White Stork and their fledged young (n = 31) all birds could be identified individually by colour and code rings, radio transmitters and plumage characteristics. Outside the nest young storks showed a similar behaviour as on the eyrie. Begging in a circle proved to be the most advantageous behaviour in order to increase the chance of being fed. It was observed that the young are only fed by their own parents. Outside the nest the young birds begged mostly towards, their own parents, so that closed family units were maintained. Kleptoparasitism by alien young birds was not recognized. Whenever the young storks attempted to beg individually from their fellow siblings (asynchrony of behaviour), they rarely succeeded in their efforts. The individual probability of being fed by the parents increased with the number of begging siblings (simultaneously), while the food portion per young bird decreased likewise. Therefore, single young birds could not profit from not having fellow siblings, but were fed less frequently. This might be the result of a parent-offspring conflict.

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