Publication
Title
Mutual ornamentation, age, and reproductive performance in the European starling
Author
Abstract
Ornamental traits expressed in both sexes are widespread among birds. Many studies have indicated that male ornaments develop through sexual selection. Female ornaments may be correlated effects of selection on males or have signaling functions in their own right. In the facultatively polygynous starling Sturnus vulgaris, both sexes possess iridescent throat feathers, which are actively displayed during courtship by males. This paper investigates the reproductive correlates of throat feather ornaments in both sexes. Bird-perceived hue and components of feather length covaried strongly, and a summary variable (the first principal component [PC1]) was extracted using Principal component analysis. Sex and age-related differences were found for PC1. Positive assortative mating was found with respect to age and PC1. However, the relative influences of ornamentation and age on breeding variables were hard to separate, so effects may be related to other age-related variables. This provides a cautionary note for studies of ornamentation where age is unknown. However, we argue that throat feathers in starlings may signal age and age-related quality measures in both sexes. Older females with higher PC1 scores bred earlier and laid larger clutches with higher hatching success; older males with higher PC1 scores had higher chances of becoming polygynous and attracting high reproductive quality females. PC1 showed no relationship with parental care in either sex. Direct reproductive benefits for males and indirect genetic benefits for either sex may drive mate choice based on these age-related characters. However, only experimental manipulation can determine whether ornamentation signals quality variation within age classes.
Language
English
Source (journal)
Behavioral ecology / International Society for Behavioral Ecology. - New York, NY
Publication
New York, NY : 2005
ISSN
1045-2249
Volume/pages
16:4(2005), p. 805-817
ISI
000229856900018
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 02.09.2009
Last edited 09.09.2017
To cite this reference