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Red zebra cichlid sexing6/7/2023 Stabilised heterozygosis of supergenes mediating certain Y-linked colour patterns in populations of Lebistes reticulatus. Part 2: The sex ratio as a tool for the determination of genotype: a model of autosomal and gonosomal influence. ![]() Sex determination in Sarotherodon ( Tilapia). Kraus International Publications, Munich. The Haplochromine Fishes of the East African Lakes. Niche segregation among Lake Malawi cichlid fishes? Evidence from stable isotope signatures. Pharyngeal biting mechanics in centrarchid and cichlid fishes: insights into a key evolutionary innovation. The Cichlid Fishes of the Great Lakes of Africa. The Genetical Theory of Natural Selection. On the origin of species by sympatric speciation. Interspecific fertile hybrids of haplochromine cichlidae (Teleostei) and their possible importance for speciation. Benjamin/ Cumings, London.Ĭharlesworth, B., 1991. Resource partitioning among rock-dwelling haplochromines (Pices: Cichlidae) from Lake Victoria. Towards a theory of mutual mate choice: lessons from two-sided matching. These results may help to explain different patterns and rates of speciation among groups of cichlids, in particular the explosive diversification of rock-dwelling haplochromine cichlids.īergstrom, C.T. Despite the lack of geographic isolation or ecological differentiation, the new species coexists with the ancestral species either temporarily or indefinitely. The models reveal multiple pathways for rapid sympatric speciation through the origin of novel color morphs with strong assortative mating that incorporate both sex-reversal and suppressor genes. The models explain why sex-reversal genes that change males into females tend to be X-linked and associated with novel colors, using the hypothesis of restricted recombination on the sex chromosomes, as suggested by previous theory on the evolution of recombination. ![]() The models are based on a combination of laboratory experiments and field observations on the ecology, male and female mating behavior, and inheritance of sex-determination and color polymorphisms. Mechanisms of speciation in cichlid fish were investigated by analyzing population genetic models of sexual selection on sex-determining genes associated with color polymorphisms.
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