polychromatism

Polychromatism refers to the presence of different color variations, or morphs, within a single species. This biological phenomenon is driven by evolutionary pressures, where natural selection favors certain color patterns, increasing their chances of survival and reproduction.1

These color variations can arise from pigments (biochromes) produced by the organism or from structural features that interact with light. Pigments like melanins, which produce shades from buff to black, are synthesized from the amino acid tyrosine. Structural colors, on the other hand, result from the physical properties of tissues, such as interference or scattering of light, often creating iridescent or blue hues.2345

Polychromatism can be influenced by genetics, with different alleles determining color traits. It can also be a response to predation, where varied coloration helps prey avoid detection by predators who may focus on a single, more common morph. A well-documented example is industrial melanism in moths, where darker forms became more prevalent in polluted environments.61