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Figure 3


Fig. 3. Feather microstructure, Fourier power spectra and predicted reflectance spectra of a blue Steller's Jay feather (A,D,G), an amelanotic Steller's jay feather (B,E,H) and a white chicken feather (C,F,I). (A–C) TEM micrographs of barbs (scale bars, 1 µm) with insets in A and b showing close-ups of spongy layer (scale bars, 500 nm). (D–F) Two-dimensional Fourier power spectrum of TEM of colour-producing structures in these feathers. The length and direction, respectively, of a vector from the origin to each value in the power spectrum indicates its spatial frequency and direction. The colour indicates the magnitude of each value in the power spectrum (scale on right). (G–I) Predicted reflectance spectra based on these Fourier analyses and the known refractive indices of keratin (1.54) and air (1.0) (for details, see Prum and Torres, 2003). c, cortex; sl, spongy layer; m, melanin granules; v, vacuoles.





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