Figure 3

Effects of tail and greater covert colour on male arrival dates. Relationships between A) Tail chroma values and residual arrival date (controlling for age and year) for male yellow warblers in Revelstoke. B) Greater covert chroma values and residual arrival date (age, year and tail chroma) for Revelstoke. C) Tail hue values and residual arrival date (age, year and age*year interaction) for males in Inuvik and D) Greater covert hue values and residual arrival (age, year, age*year interaction and tail hue) for Inuvik. Lines of best fit included when significant (p > 0.05).