Harry van Oort

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Carotenoids produce many of the red, orange and yellow signal traits of birds, and individuals must trade off utilizing carotenoids for physiological processes versus ornamentation. Proximate mechanisms regulating this trade-off are poorly understood, despite their importance for expression of color signals. Corticosterone (CORT) may play a significant(More)
1. Conditional handicap models of sexual selection predict that ornamentation should be positively associated with an individual's ability to withstand challenges to their health. 2. We assessed whether levels of carotenoid ornamentation were related to the probability of adult male Common Redpolls, Carduelis flammea , dying in a salmonellosis epidemic by(More)
  • H. Oort
  • 2005
Die beiderseits im Petrosum verborgenen h~u~igen Labyrinthe, aus Sacculus, Utriculus mig Bogengangen und Ductus cochlearis bestehend, sind mit~els feiner Bindegewebsbalken an der inneren Wand einer knSchernen Kapsel befestigt, welche in ihrer Gestaltung die Form des hautigen Labyrinthes wiederholt. Diese aus sehr kompakter Knochensubstanz bestehende(More)
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