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Genetic differentiation and evolutionary relationships were surveyed on 12 species of the Old and seven species of the New World Emberizidae by allozyme electrophoresis of 20 loci. Genetic variability of the Emberizidae is similar to those of the other Passeriformes. The degree of genetic differentiation in the family were large among species of the genus Emberiza of the Old World, and also among genera of the New World Emberizidae. Evolutionary relationships of the Emberizidae based on these genetic distances differed considerably from those of previous publications on some points: (1) Emberiza tristrami, E. elegans, E. bruniceps and E. schoeniclus were genetically much diverged from the other Emberiza as a species of the same genus. (2) Some genetic distances between Emberiza were larger than distances between subfamilies of the New World Emberizidae. (3) Species of the Cardinarinae examined genetically, belonged to the Emberizinae of the New World. Genetic data did not support the current classification that the Old World buntings arose from the New World forms by recent colonization. Discussion was made on the evolution of the Old and New World Emberizidae from the genetic view point.

Genetic Divergence and Evolutionary Relationships of the Old and New World Emberizidae