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  4. Sex- and melanism-specific variations in the oxidative status of adult tawny owls in response to manipulated reproductive effort.
 
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Titre

Sex- and melanism-specific variations in the oxidative status of adult tawny owls in response to manipulated reproductive effort.

Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Journal of Experimental Biology  
Auteur(s)
Emaresi, G.
Auteure/Auteur
Henry, I.
Auteure/Auteur
Gonzalez, E.
Auteure/Auteur
Roulin, A.
Auteure/Auteur
Bize, P.
Auteure/Auteur
Liens vers les personnes
Roulin, Alexandre  
Bize, Pierre  
Liens vers les unités
Dép. d'écologie et d'évolution  
Groupe Roulin  
ISSN
1477-9145
Statut éditorial
Publié
Date de publication
2016-01
Volume
219
Numéro
Pt 1
Première page
73
Dernière page/numéro d’article
79
Peer-reviewed
Oui
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
Oxidative stress, determined by the balance between the production of damaging reactive oxygen species (ROS) and antioxidant defences, is hypothesized to play an important role in shaping the cost of reproduction and life history trade-offs. To test this hypothesis, we manipulated reproductive effort in 94 breeding pairs of tawny owls (Strix aluco) to investigate the sex- and melanism-specific effects on markers of oxidative stress in red blood cells (RBCs). This colour polymorphic bird species shows sex-specific division of labour and melanism-specific history strategies. Brood sizes at hatching were experimentally enlarged or reduced to increase or decrease reproductive effort, respectively. We obtained an integrative measure of the oxidative balance by measuring ROS production by RBCs, intracellular antioxidant glutathione levels and membrane resistance to ROS. We found that light melanic males (the sex undertaking offspring food provisioning) produced more ROS than darker conspecifics, but only when rearing an enlarged brood. In both sexes, light melanic individuals had also a larger pool of intracellular antioxidant glutathione than darker owls under relaxed reproductive conditions (i.e. reduced brood), but not when investing substantial effort in current reproduction (enlarged brood). Finally, resistance to oxidative stress was differently affected by the brood size manipulation experiment in males and females independently of their plumage coloration. Altogether, our results support the hypothesis that reproductive effort can alter the oxidative balance in a sex- and colour-specific way. This further emphasizes the close link between melanin-based coloration and life history strategies.
Sujets

Animals

Antioxidants/metaboli...

Clutch Size

Erythrocytes/chemistr...

Feathers/physiology

Female

Glutathione/metabolis...

Male

Melanins/chemistry

Oxidative Stress

Pigmentation/physiolo...

Reactive Oxygen Speci...

Reproduction

Sex Factors

Strigiformes/physiolo...

PID Serval
serval:BIB_2A5747C57185
DOI
10.1242/jeb.128959
PMID
26567343
Permalien
https://iris.unil.ch/handle/iris/42117
Open Access
Oui
Date de création
2015-10-28T07:08:02.843Z
Date de création dans IRIS
2025-05-20T14:04:40Z
Fichier(s)
En cours de chargement...
Vignette d'image
Nom

73.full.pdf

Version du manuscrit

published

Taille

317.09 KB

Format

Adobe PDF

PID Serval

serval:BIB_2A5747C57185.P001

URN

urn:nbn:ch:serval-BIB_2A5747C571851

Somme de contrôle

(MD5):f13af74309c7cad93feeca717a2f607d

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