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dc.contributor.authorSilva, Maria Nazareth Ferreira da-
dc.contributor.authorPatton, James L.-
dc.description.abstractPatterns of evolutionary relationships among haplotype clades of sequences of the mitochondrial cytochrome b DNA gene are examined for five genera of arboreal rodents of the Caviomorph family Echimyidae from the Amazon Basin. Data are available for 798 bp of sequence from a total of 24 separate localities in Peru, Venezuela, Bolivia, and Brazil for Mesomys, Isothrix, Makalata, Dactylomys, and Echimys. Sequence divergence, corrected for multiple hits, is extensive, ranging from less than l% for comparisons within populations of over 20% among geographic units within genera. Both the degree of differentiation and the geographic patterning of the variation suggest that more than one species composes the Amazonian distribution of thecurrently recognized Mesomys hispidus, Isothrix bistriata, Makalata didelphoides, and Dactylomys dactylinus. There is general concordance in the geographic range of haplotype clades for each of these taxa, and the overall level of differentiation within them is largely equivalent. These observations suggest that a common vicariant history underlies the respective diversification of each genus. However, estimated times of divergence based on the rate of third position transversion substitutions for the major clades within each genus typically range above 1 million years. Thus, allopatric isolation precipitating divergence must have been considerably earlier than the late Pleistocene forest fragmentation events commonly invoked for Amazonian biota. © 1993 Academic Press.en
dc.relation.ispartofVolume 2, Número 3, Pags. 243-255pt_BR
dc.subjectCytochrome Ben
dc.subjectDna, Mitochondrialen
dc.subjectPrimer Dnaen
dc.subjectComparative Studyen
dc.subjectGenetic Variabilityen
dc.subjectLiver Mitochondrionen
dc.subjectMolecular Geneticsen
dc.subjectNucleotide Sequenceen
dc.subjectSpecies Differenceen
dc.subjectBase Sequenceen
dc.subjectComparative Studyen
dc.subjectCytochrome Ben
dc.subjectDna Primersen
dc.subjectDna, Mitochondrialen
dc.subjectMitochondria, Liveren
dc.subjectMolecular Sequence Dataen
dc.subjectSpecies Specificityen
dc.subjectSupport, Non-u.S. Gov'ten
dc.subjectSupport, U.S. Gov't, Non-p.H.S.en
dc.subjectVariation (genetics)en
dc.titleAmazonian phylogeography: Mtdna sequence variation in arboreal echimyid rodents (caviomorpha)en
dc.publisher.journalMolecular Phylogenetics and Evolutionpt_BR
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