Phylogenetic relationships of the western North American cyprinid genus Richardsonius, with an overview of phylogeographic structure

Diversification of many North American taxa, including freshwater fishes, has been heavily influenced by the effects of complex geological and climatic events throughout the Cenozoic that have significantly altered the landscape. Here, we employ an array of phylogenetic analyses using a multiple gen...

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Bibliographic Details
Published in:Molecular phylogenetics and evolution 2010-04, Vol.55 (1), p.259-273
Main Authors: Houston, Derek D., Shiozawa, Dennis K., Riddle, Brett R.
Format: Article
Language:English
Subjects:
Animals
Arrays
Bayes Theorem
Biogeography
Calibration
Cell Nucleus - genetics
Clinostomus
Cyprinidae
Cyprinidae - classification
Cyprinidae - genetics
Divergence
DNA, Mitochondrial - genetics
Drainage history
Estimates
Evolution
Evolution, Molecular
Fish
Fossils
Geography
Geology
Iotichthys
Lahontan redside shiner
Landscapes
Models, Genetic
North America
Phylogeny
Redside shiner
Sequence Alignment
Sequence Analysis, DNA
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Summary:Diversification of many North American taxa, including freshwater fishes, has been heavily influenced by the effects of complex geological and climatic events throughout the Cenozoic that have significantly altered the landscape. Here, we employ an array of phylogenetic analyses using a multiple gene tree approach to address several questions regarding the phylogenetic relationships of the North American cyprinid genus Richardsonius and two other closely related genera, Clinostomus and Iotichthys. We also use divergence time estimates generated using fossil calibrations to qualitatively assess the phylogeographic implications of evolution within the group. Mitochondrial and nuclear DNA sequences show a sister relationship between Iotichthys and Richardsonius, with Clinostomus being sister to an Iotichthys–Richardsonius clade, hence the currently recognized sister relationship between Clinostomus and Richardsonius is not supported. These genera appear to be monophyletic lineages, and sister species within genera appear to be reciprocally monophyletic. The two species within the genus Richardsonius both exhibit phylogeographic structure that is worthy of further investigation. Divergence time estimates between genera and species are Miocene or Pliocene in age, and divergence between phylogroups within species occurred in the late Pliocene to Pleistocene. These splits coincide with documented geological and climatic events.
ISSN:1055-7903
1095-9513
DOI:10.1016/j.ympev.2009.10.017