Table 1.
Summary of principal components analyses of adult eastern bluebird plumage color and associated correlates of specific color variables. Positive and negative symbols indicate direction of associations, the zero symbol indicates no relationship.
| Brightness | Chroma | Hue | Agec | Conditiond,e | Description | |
|---|---|---|---|---|---|---|
| Male | ||||||
| aRump (PC1) | + | + | − | + | + | Bright, more UV chroma, left-shifted hues |
| aTail (PC1) | + | − | + | − | Bright, less UV chroma, right-shifted hues | |
| bBreast (PC1) | + | − | + | Bright, less red chroma | ||
| Female | ||||||
| aRump (PC1) | + | + | − | + | Bright, more UV chroma, left-shifted hues | |
| aTail (PC1) | + | − | More UV chroma, left-shifted hues | |||
| aTail (PC2) | + | Bright | ||||
| bBreast (PC1) | + | − | ⊘ | Bright, less red chroma |
a
Structural plumage colouration
b
Melanin plumage colouration
c
Siefferman et al. 2005
d
Siefferman and Hill 2005d
e
Siefferman and Hill 2005b