TY - JOUR
T1 - Comparing Molecular Evolution in Two Mitochondrial Protein Coding Genes (Cytochromeband ND2) in the Dabbling Ducks (Tribe: Anatini)
AU - Johnson, Kevin P.
AU - Sorenson, Michael D.
N1 - Funding Information:
We thank Mike Lubbock, H. Glynn Young, Marc Woodin, Woody Martin, Murray Williams, Les Christidis, Kevin McCracken, Shannon Hackett, and John Klicka for their assistance in obtaining tissue and feather specimens. Robert Zink, David Mindell, and Robert Fleischer were generous in allowing us to use laboratory space and equipment to conduct the DNA sequencing. We thank S. Lanyon, F. McKinney, K. Omland, J. Weckstein, U. Wittmann, and R. Zink for reviewing earlier versions of the manuscript. David Swofford kindly gave us permission to publish results from a prerelease version of PAUP*. This work was supported financially by a National Science Foundation Doctoral Dissertation Improvement Grant, Frank M. Chapman Memorial Grants, and Dayton and Wilkie Funds for Natural History Grants to K.J.
PY - 1998/8
Y1 - 1998/8
N2 - Rates of sequence evolution were estimated for the cytochromeb(cytb) and NADH dehydrogenase subunit 2 (ND2) genes using a phylogeny of the dabbling ducks (Tribe: Anatini) and outgroups. This speciose group was densely sampled, reducing the impact of undetected homoplasy on rate comparisons. Phylogenies based on sequences of the two gene regions and various weighting schemes differed, but most of the differences involved weakly supported nodes. In addition, partition homogeneity tests show that these differences were not due to statistically significant conflict between the data sets. Cytband ND2 also showed similar rates and types of both nucleotide and amino acid substitutions. For both genes, substitutions between isoleucine and valine and between alanine and threonine were most common; both of these substitution types are the result of A-G transitions at first positions of codons. Rates of sequence evolution varied substantially and significantly among nucleotide positions, and even within a given codon position (first, second, or third), rates were significantly heterogeneous among sites. Within Anatini, cytband ND2 show similar levels of variation and homoplasy, and are equally useful for reconstructing the species level phylogeny of this group.
AB - Rates of sequence evolution were estimated for the cytochromeb(cytb) and NADH dehydrogenase subunit 2 (ND2) genes using a phylogeny of the dabbling ducks (Tribe: Anatini) and outgroups. This speciose group was densely sampled, reducing the impact of undetected homoplasy on rate comparisons. Phylogenies based on sequences of the two gene regions and various weighting schemes differed, but most of the differences involved weakly supported nodes. In addition, partition homogeneity tests show that these differences were not due to statistically significant conflict between the data sets. Cytband ND2 also showed similar rates and types of both nucleotide and amino acid substitutions. For both genes, substitutions between isoleucine and valine and between alanine and threonine were most common; both of these substitution types are the result of A-G transitions at first positions of codons. Rates of sequence evolution varied substantially and significantly among nucleotide positions, and even within a given codon position (first, second, or third), rates were significantly heterogeneous among sites. Within Anatini, cytband ND2 show similar levels of variation and homoplasy, and are equally useful for reconstructing the species level phylogeny of this group.
KW - Anas
KW - MtDNA coding gene evolution
KW - ND2
KW - cytochromeb
KW - molecular phylogeny
KW - weighting
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U2 - 10.1006/mpev.1997.0481
DO - 10.1006/mpev.1997.0481
M3 - Article
C2 - 9751919
AN - SCOPUS:0032135217
SN - 1055-7903
VL - 10
SP - 82
EP - 94
JO - Molecular Phylogenetics and Evolution
JF - Molecular Phylogenetics and Evolution
IS - 1
ER -