Molecular Biology and Evolution, Vol 8, 85-103, Copyright © 1991 by Society for Molecular Biology and Evolution
MF Smith and JL Patton
A 401-bp fragment of the mitochondrial cytochrome b gene was sequenced from
polymerase chain reaction-amplified products for 20 natural populations
representing 12 species of South American akodontine rodents (Muridae).
Variation among these taxa increased with their hierarchical position, from
comparisons within local populations to those among different genera. Two
individuals from the same local population differed by less than 1%
sequence divergence. Sequence divergence among geographic samples within a
species was 0.25%-8%, while that among species was 3%-21%. Comparisons of
the akodontine sequences with that for the house mouse show 21%-25%
sequence difference. A parsimony-based phylogenetic analysis of the data
supports the placement of the taxon Microxus within Akodon (sensu stricto),
of Bolomys just outside the Akodon cluster, and of Chroeomys as a separate
genus quite distinct from the other members of this group. This
phylogenetic hypothesis is identical to that determined from
electrophoretic data but is quite divergent from the present taxonomy of
the group.
ORIGINAL ARTICLE
Variation in mitochondrial cytochrome b sequence in natural populations of South American akodontine rodents (Muridae: Sigmodontinae)
Museum of Vertebrate Zoology, University of California, Berkeley 94720.
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