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MBE Advance Access originally published online on January 22, 2004
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Mol. Biol. Evol. 21(6):974-983. 2004
DOI: 10.1093/molbev/msh065
© 2004 by the Society for Molecular Biology and Evolution. ISSN: 0737-4038

Four New Avian Mitochondrial Genomes Help Get to Basic Evolutionary Questions in the Late Cretaceous

G. L. (Abby) Harrison*,1, P. A. McLenachan*, M. J. Phillips*, Kerryn E. Slack*,{dagger}, Alan Cooper{ddagger} and David Penny*

* Allan Wilson Center for Molecular Ecology and Evolution, Massey University, Palmerston North, New Zealand
{dagger} Department of Genetics, Cell and Organism Biology, University of Lund, Lund, Sweden
{ddagger} Department of Zoology, Oxford University, Oxford, United Kingdom

E-mail: d.penny{at}massey.ac.nz.

Good phylogenetic trees are required to test hypotheses about evolutionary processes. We report four new avian mitochondrial genomes, which together with an improved method of phylogenetic analysis for vertebrate mt genomes give results for three questions in avian evolution. The new mt genomes are: magpie goose (Anseranas semipalmata), an owl (morepork, Ninox novaeseelandiae); a basal passerine (rifleman, or New Zealand wren, Acanthisitta chloris); and a parrot (kakapo or owl-parrot, Strigops habroptilus). The magpie goose provides an important new calibration point for avian evolution because the well-studied Presbyornis fossils are on the lineage to ducks and geese, after the separation of the magpie goose. We find, as with other animal mitochondrial genomes, that RY-coding is helpful in adjusting for biases between pyrimidines and between purines. When RY-coding is used at third positions of the codon, the root occurs between paleognath and neognath birds (as expected from morphological and nuclear data). In addition, passerines form a relatively old group in Neoaves, and many modern avian lineages diverged during the Cretaceous. Although many aspects of the avian tree are stable, additional taxon sampling is required.

Key Words: avian evolution • mitochondrial genomes • Anseranas (Anseriformes) • morepork (owl, Strigiformes) • kakapo (parrot Psittaciformes) • rifleman (N Z Wren, Passeriformes) • RY-coding


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