Carotenoid-based breast plumage colour, body condition and clutch size in red fodies (Foudia madagascariensis)

  • Laura K Estep Department of Biological Sciences, 331 Funchess Hall, Auburn University, Alabama 36849, USA; Current address: Department of Epidemiology and Public Health, Yale School of Medicine, 60 College Street, PO Box 208034, New Haven, CT 06520–8034, Connecticut,
  • Matthew D Shawkey Department of Biological Sciences, 331 Funchess Hall, Auburn University, Alabama 36849, USA; Current address: Department of Environmental Science, Policy and Management, 137 Mulford Hall #3114, University of California, Berkeley, CA 94720-3114, USA
  • Geoffrey E Hill Department of Biological Sciences, 331 Funchess Hall, Auburn University, Alabama 36849, USA

Abstract

Carotenoid-based feather colouration is a classic example of a condition-dependent ornamental trait. In some species of birds, red, orange and yellow feather colouration reflects male quality and advertises the carotenoid concentration of feathers. Such colouration is an important aspect of mate selection by females. The red fody (Foudia madagascariensis) is a highly sexually dimorphic species of the family Ploceidae, in which males exhibit extensive carotenoid-based plumage. We investigated associations between body condition, clutch size, first egg date and carotenoid-based red plumage colour of male red fodies. Breast plumage brightness was positively associated with male body condition, suggesting that this component of colour is condition-dependent. Brighter-red males did not breed earlier but were mated to females that laid larger clutches compared to females mated to duller-coloured males. These data suggest that red colour in red fodies has the potential to function as an honest signal of male quality.

Ostrich 2006, 77(3&4): 164–169
Published
2006-11-24
Section
Articles

Journal Identifiers


eISSN: 1727-947X
print ISSN: 0030-6525