Journal
JOURNAL OF EVOLUTIONARY BIOLOGY
Volume 20, Issue 1, Pages 45-53Publisher
WILEY
DOI: 10.1111/j.1420-9101.2006.01228.x
Keywords
Castle-Wright estimator; cichlid fish; male colour genes; sexual selection; speciation
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The genetic basis of traits involved in reproductive isolation is a key parameter in models of sympatric speciation by sexual selection, a potential mechanism driving the explosive radiation of East African cichlids. Analysis of hybrid crosses between two sympatric Lake Malawi cichlid species, representing the extremes of the extant colour distribution, generated Castle-Wright estimates of four to seven loci controlling colour differences. Segregation patterns deviated from a purely additive model with a significant contribution from dominance, and possibly also epistasis. Evidence was found for a strong influence of autosomal loci. As departures from simple additive variation could effect the operation of models of sympatric speciation, dominance and epistasis should not be neglected.
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