Fig. 2: Plumage reflectance spectra measured in male purple-crowned fairy-wrens and represented in their visual space. | Heredity

Fig. 2: Plumage reflectance spectra measured in male purple-crowned fairy-wrens and represented in their visual space.

From: Variability, heritability and condition-dependence of the multidimensional male colour phenotype in a passerine bird

Fig. 2

Shown are examples of reflectance spectrum measured in a male in breeding plumage for (a) the purple crown, black cheek and blue tail colouration, and (b) the buff-white throat and brown back colouration. Chromatic variability of each patch (except the black cheek) computed in the avian visual space is represented for (c) the purple crown and blue tail colouration, and (d) the buff-white throat (in yellow) and brown back colouration. PCs explaining ≥95% of chromatic variation for each colour are depicted, in red for PC1 axes and in green for PC2 axes; PC1 axes are very similar for the buff-white and brown colouration and therefore indistinguishable in (d). The X-axis represents stimulation of the VS cone relative to the S cone, higher values of the Y-axis represents higher stimulation of the M cone relative to VS and S cones, while the Z-axis represents higher relative stimulation of the L cone compared with the other three (units = jnd).

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