Visual Background Choice and Light Environment Affect Male Guppy Visual Contrast.

The chromatic differences between guppies and backgrounds (ΔS) are all highly significant ( p < 0.00001) for both light environments ( FS and OC , Table 3 and Figure S12 ), with ΔS >>1 ( Table 3 and Figure S11 ), indicating strong chromatic contrast between guppies and both spacelight and substrates.

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