Digest: Habitat and predation drive color evolution and diversification in Darters

Divergent selection on coloration and patterning can drive diversification among closely related species. In a recent study, Schroth-Sanchez et al. (2026) used Darter fish to identify specific habitat variables that influence color evolution. They found that smaller, rocky streams with fewer predators and high light environments contribute to greater rates of diversification and brighter, bolder patterns. This work suggests that certain habitats may foster greater diversification and speciation through an interplay of ecological and sexual selection.