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Matthew B. Toomey Michael W. Butler Melissa G. Meadows Lisa A. Taylor H. Bobby Fokidis Kevin J. McGraw 《Behavioral ecology and sociobiology》2010,64(6):1047-1055
The glossy sheen of healthy hair is an ideal of human beauty; however, glossiness has never been quantified in the context
of non-human animal signaling. Glossiness, the specular reflectance characteristic of polished surfaces, has the potential
to act as a signal of quality because it depends upon material integrity and cleanliness. Here, we undertook two studies of
glossiness in avian plumage to determine (a) the repeatability of a recently developed measure of glossiness, (b) the relationship
between glossiness and conventional measures of coloration, and (c) how glossiness is associated with quality signaling. Using
museum specimens of three North American bird species with glossy plumage (red-winged blackbird, Agelaius phoeniceus; great-tailed grackle, Quiscalus mexicanus; Chihuahuan raven, Corvus cryptoleucus), we found that the glossiness measure was highly repeatable for all species and was significantly correlated with plumage
coloration (e.g., chroma, brightness) in male great-tailed grackles. We then used wild-caught grackles to examine sexual dimorphism
in plumage glossiness and its correlation to a potentially sexually selected trait in this species, male tail length. We found
that males were significantly glossier than females and that male, but not female, glossiness correlated positively with tail
length. This study provides a repeatable method to measure glossiness and highlights its potential as a signal of individual
quality in animals. 相似文献