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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Individual female common cuckoos Cuculus canorus lay constant egg types but egg appearance cannot be used to assign eggs to females
Auteurs :	Arne Moksnes, Auteur ; Eivin Roskaft, Auteur ; Geir Rudolfsen, Auteur ; Sigrun Skjelseth, Auteur ; Bard G. Stokke, Auteur ; Oddmund Kleven, Auteur ; H. Lisle Gibbs, Auteur ; Marcel Honza, Auteur ; Barbara Taborsky, Auteur ; Yvonne Teuschl, Auteur ; Wolfgang Vogl, Auteur ; Michael Taborsky, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (39(2) MAR 2008)
Article en page(s) :	238-241
Langues:	Anglais
Résumé :	Females of the obligate brood parasitic common cuckoo Cuculus canorus are assumed to lay eggs of consistent colour and pattern and egg characteristics have been used to separate between different individuals. We tested the "constant egg-type hypothesis" in blind tests using test persons who grouped cuckoo eggs into "potential clutches" based on similarity in appearance. A correct classification of eggs laid by known (radiotagged) females supported the hypothesis. However, comparisons between maternity based on visual assessments and DNA-based parentage analyses revealed rather poor concordance between the two methods. Our findings indicate that egg characteristics cannot be used to separate between cuckoo females, even if they lay eggs with constant appearance. The reason is probably that there are only small or negligible variations in egg appearance between some females like mothers and daughters or other closely related individuals.

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