Fig. 3

Colour change in homogeneous greenish‐brown (GB) and pink (P) individuals when exposed to a algal and b artificial substrates of brown and pink-red coloration for five days. Data from different aquaria, in each combination of ‘morph’ and ‘substrate colour’, were pooled. Final shrimp colour (hue) was defined as the ratio between reflectance in the red and green colour channels. Higher hue values correspond to reddish tones. Mean values are denoted by solid black lines and different letters indicate significant statistical differences between groups (p < 0.05)