colour pattern, Tropheus, environmental fluctuations, genetic admixture, Cichlidae, Carotenoid coloration, hybrid speciation, mate choice, Lake Tanganyika, climate change, DNA, Mitochondrial - metabolism, Fish Proteins - metabolism, Zambia, Phylogeny, Cichlids - genetics, Pigmentation, Genetic Variation, Fish Proteins - genetics, Phenotype, Animals, DNA, Mit...