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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Longwing (Heliconius) butterflies combine a restricted set of pigmentary and structural coloration mechanisms

Fig. 4

Spectral tuning in H. doris. The blue areas of the dorsal hindwings of the blue morph of H. d. doris (see Fig. 1d) are green in this specimen of H. d. viridis (inset; scale bar: 1 cm). The solid lines line show the reflectance spectra for the various morphs, while the dotted lines show the reflectance spectra measured after extraction of the pigment using acidified methanol (see Methods and Additional file 1: Fig. S2)

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