Journal Article

Breeding rate is associated with pheomelanism in male and with eumelanism in female barn owls

Alexandre Roulin and Res Altwegg

in Behavioral Ecology

Published on behalf of International Society for Behavioral Ecology

Volume 18, issue 3, pages 563-570
Published in print May 2007 | ISSN: 1045-2249
Published online March 2007 | e-ISSN: 1465-7279 | DOI: http://dx.doi.org/10.1093/beheco/arm015
Breeding rate is associated with pheomelanism in male and with eumelanism in female barn owls

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Melanin-based coloration exists in 2 types: black eumelanism and reddish-brown pheomelanism, which both have a strong heritable component. To test whether these 2 types of melanism are associated with alternative adaptations, we carried out a correlative study over 8 years and an experiment in a Swiss population of barn owls, Tyto alba. This species varies in coloration from reddish-brown to white and from lightly to heavily marked with black spots. Based on the fact that plumage coloration and spottiness are male- and female-specific secondary sexual characters, respectively, we examined whether the probability of breeding is associated with the degree of pheomelanism in males and of eumelanism in females. In males, recruited nestlings were significantly less reddish-brown than their nonrecruited nest mates. In females, individuals displaying larger black spots started to breed at a younger age and had a higher survival, and females with experimentally reduced plumage spottiness bred less often than control females. Therefore, in the barn owl, the degree of male pheomelanism is associated with the probability of being recruited in the local population, whereas the degree of female eumelanism correlates with age at sexual maturity, survival probability, and also the probability of skipping reproduction.

Keywords: color polymorphism; female ornament; melanin; sexual maturity; survival; Tyto alba

Journal Article.  6663 words.  Illustrated.

Subjects: Evolutionary Biology ; Ecology and Conservation ; Zoology and Animal Sciences

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