Melanin-based colour polymorphism signals aggressive personality in nest and territory defence in the tawny owl (Strix aluco)

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_F43143D18826
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Melanin-based colour polymorphism signals aggressive personality in nest and territory defence in the tawny owl (Strix aluco)
Périodique
Behavioral Ecology and Sociobiology
Auteur(s)
Da Silva A., van den Brink V., Emaresi G., Luzio E., Bize P., Dreiss A.N., Roulin A.
ISSN
0340-5443
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
67
Numéro
7
Pages
1041-1052
Langue
anglais
Résumé
Nest and territory defence are risky and potentially dangerous behaviours. If the resolution of life history trade-offs differs between individuals, the level of defence may also vary among individuals. Because melanin-based colour traits can be associated with life history strategies, differently coloured individuals may display different nest and territory defence strategies. We investigated this issue in the colour polymorphic tawny owl (Strix aluco) for which plumage varies from dark to light reddish melanic. Accordingly, we found that (1) our presence induced a greater response (flying around) from dark-coloured than light-coloured females and (2) dark reddish males suffered lower nest predation rates than light-coloured males. In experimentally enlarged broods, the probability that females reacted after we played back the hoot calls of a stranger male was higher if these females were lighter reddish; the opposite pattern was found in experimentally reduced broods with dark parents being more reactive than light parents. Finally, darker females alarmed more frequently when paired with a light than with a dark male, suggesting that partners adjust their behaviour to each other. We also tested whether colouration is used as a signal by conspecifics to adjust the level of their defensive behaviour. Accordingly, breeding females responded more vigorously to a dark than a light reddish stuffed tawny owl placed beside their nest. We conclude that melanin-based colouration is a signal of alternative nest and territory defence behaviour that depends on ecological factors.
Mots-clé
Nest defence, Colour polymorphism, Personality, Pheomelanin, Predation
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Création de la notice
09/03/2013 20:57
Dernière modification de la notice
20/08/2019 16:21
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