Incongruent gene trees, complex evolutionary processes, and the phylogeny of a group of North American minnows ( Hybognathus Agassiz 1855)

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 seq...

Full description

Saved in:
Bibliographic Details
Published in:Molecular phylogenetics and evolution 2009-03, Vol.50 (3), p.514-525
Main Authors: Moyer, G.R., Remington, R.K., Turner, T.F.
Format: Article
Language:English
Subjects:
Animals
Cell Nucleus - genetics
Cyprinidae - classification
Cyprinidae - genetics
Data combinability
DNA, Mitochondrial - genetics
Empirical Bayes
Evolution, Molecular
Genetics, Population
Growth hormone intron
Historical hybridization
Introns
Likelihood Functions
Mitochondrial DNA
North America
Phylogenetic conflict
Phylogeny
S7 ribosomal protein gene
Sequence Analysis, DNA
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2008.11.002