Molecular Biology and Evolution, Vol 10, 619-634, Copyright © 1993 by Society for Molecular Biology and Evolution
AT Beckenbach, YW Wei and H Liu
We compare the sequences for the mitochondrial cytochrome oxidase II gene
of 13 species of the Drosophila obscura group. The survey includes six
members of the D. affinis subgroup, four of the D. pseudoobscura subgroup,
and three of the D. obscura subgroup. In all species, the gene is 688
nucleotides in length, encoding a protein of 229 amino acids plus the first
position T of the stop codon. The sequences show the typical
high-transition bias for closely related species, but that bias is
essentially eliminated for species pairs of > 5% sequence divergence.
The phylogenetic relationships in the species group are inferred using both
neighbor-joining and maximum parsimony. The two procedures give comparable
results, showing that the D. affinis and D. pseudoobscura subgroups are
monophyletic groupings that appear to have closer affinities to one another
than either has to the D. obscura subgroup. We use transversion distances
to estimate times of divergence, on the basis of three different estimates
of the time of separation of the D. obscura species group from the D.
melanogaster group. If that event occurred 35 Mya, then we can estimate the
origin of the nearctic forms at approximately 22 Mya and the separation of
the D. affinis and D. pseudoobscura subgroups at approximately 17 Mya.
ORIGINAL ARTICLE
Relationships in the Drosophila obscura species group, inferred from mitochondrial cytochrome oxidase II sequences
Institute of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, British Columbia, Canada.
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