Figure 1 (IMAGE)

Ben-Gurion University of the Negev

Figure 1

Caption

Highly saturated thorax colors in blue-tailed damselflies. (A) The male blue-tailed damselfly (Ischnura elegans). Photo credit: Ian Kirk. (B) Juvenile thoraxes during the development (i–iv). Right; tail region. (C) Reflectance spectra from the thoraxes and tail also exhibiting an intensifying shoulder peak at 430 nm. The black arrow indicates the color progression over ontogeny. (D) The spectra in (C) plotted on a CIE chromaticity diagram. w; white point of standard illuminant D65 corresponding to average daylight (saturation increases with distance from the white point). Dotted triangle; the sRGB color space, dashed rectangle; enlarged region of interest in (E). (E) Reflectance spectra collected from ~100 damselflies, converted to chromaticity coordinates and plotted on a CIE chromaticity diagram, exhibiting a gradual color change from green to blue.

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Reproduced with permission from Proceedings of the National Academy of Sciences (PNAS)

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