期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 50, 期 3, 页码 514-525出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2008.11.002
关键词
Data combinability; Empirical Bayes; Growth hormone intron; Historical hybridization; Mitochondrial DNA; Phylogenetic conflict; S7 ribosomal protein gene
资金
- A.M. Snyder in the Museum of Southwestern Biology (MSB)
- Division of Fishes
- University of New Mexico
- National Science Foundation [DEB-0133233]
- MSB Division of Genomic Resources
- New Mexico State [1896, 3015]
- [TE001623-0]
- [TE038055-0]
Hybognathus is a putatively monophyletic group of North American minnows containing seven extant species. Although much is known about the taxonomy, biology, and life history of Hybognathus species, their phylogenetic relations with each other remain unclear. We address this problem with partial sequences of mitochondrial cytochrome-b, 16S rRNA, and ND4 mtDNA genes and nuclear growth hormone (GH) and S7 introns from representatives of all Hybognathus species and four outgroup taxa. Phylogenetic analyses of these data corroborated previous studies on the monophyly of seven recognized species of Hybognathus, and indicated weak support for monophyly of the genus. Topological tests, however, revealed significant (all P < 0.001) conflict among molecular data sets. Ad hoc removal of taxa, from topologies and subsequent testing indicated that incongruence was localized to two specific ingroup taxa (H. hayi and H. regius) and suggested that the conflict is a function of underlying processes that have generated the observed phylogenetic patterns. Hybridization (ancestral), which is commonplace in cyprinids, may best explain topological disagreements among datasets; however, retention of ancestral polymorphism and natural selection remain as alternative hypotheses. Our results highlight methodological and topological problems associated with estimating interspecific phylogenies from multiple genes. (C) 2009 Published by Elsevier Inc.
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