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Allozyme genetic distances and evolutionary relationships in species of akodontine rodents (Cricetidae: Sigmodontinae)
- APFELBAUM, LILIANA I., REIG, OSVALDO A.
- Biological journal of the Linnean Society 1989 v.38 no.3 pp. 257-280
- Miocene epoch, Oligoryzomys longicaudatus, allozymes, fossils, genetic distance, genetic variation, loci, monophyly, rodents
- Allozyme genetic distances were estimated for ten species of akodontine rodents, as compared with the Oryzomyini Oligoryzomys longicaudatus, which was used as an outgroup to assess plesiomorphic character-states. Twenty-six loci were analysed. Distribution patterns of allele frequencies were determined by both phenetic (UPGMA) and cladistic (PAUP') techniques. Allozyme analysis confirmed monophyly for the Akodontini, and among them, the distinctiveness of the genus Oxymycterus. Genetic divergence among the eight species of Akodon was small compared to most known species of rodents. Phenrtic and phylogenetic analysis between Bolonys obscurus and species of Akodon was m agreement with previous chromosomal work but in disagreement with the indications of morphology. The general lack of allozymic differentiation among members of the Akodontini suggests that in this group molecular divergence is unrelated to speciation. Molecular clock estimation calibrated by fossils showed that generic divergence within Akodontini started at least in the late Miocene and that divergence of Akodintini from Orizomyini occurred within the Miocene.