Influence of Introgression and Geological Processes on Phylogenetic Relationships of Western North American Mountain Suckers (Pantosteus, Catostomidae)

Peter UNMACK, Thomas Dowling, Nina Laitinen, Carol Secor, Richard Mayden, Dennis Shiozawa, Gerald Smith

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Abstract

Intense geological activity caused major topographic changes in Western North America over the past 15 million years. Major rivers here are composites of different ancient rivers, resulting in isolation and mixing episodes between river basins over time. This history influenced the diversification of most of the aquatic fauna. The genus Pantosteus is one of several clades centered in this tectonically active region. The eight recognized Pantosteus species are widespread and common across southwestern Canada, western USA and into northern Mexico. They are typically found in medium gradient, middle-elevation reaches of rivers over rocky substrates. This study (1) compares molecular data with morphological and paleontological data for proposed species of Pantosteus, (2) tests hypotheses of their monophyly, (3) uses these data for phylogenetic inferences of sister-group relationships, and (4) estimates timing of divergence events of identified lineages. Using 8055 base pairs from mitochondrial DNA protein coding genes, Pantosteus and Catostomus are reciprocally monophyletic, in contrast with morphological data. The only exception to a monophyletic Pantosteus is P. columbianus whose mtDNA is closely aligned with C. tahoensis because of introgression. Within Pantosteus, several species have deep genetic divergences among allopatric sister lineages, several of which are diagnosed and elevated to species, bringing the total diversity in the group to 11 species. Conflicting molecular and morphological data may be resolved when patterns of divergence are shown to be correlated with sympatry and evidence of introgression.
Original languageEnglish
Pages (from-to)1-17
Number of pages17
JournalPLoS One
Volume9
Issue number3
DOIs
Publication statusPublished - 2014
Externally publishedYes

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Geological Phenomena
Catostomidae
Cypriniformes
Rivers
introgression
rivers
phylogeny
mitochondrial DNA
Mitochondrial DNA
Catostomus
Sympatry
sympatry
monophyly
Mitochondrial Proteins
North America
Mexico
fauna
Base Pairing
Canada
Catchments

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UNMACK, Peter ; Dowling, Thomas ; Laitinen, Nina ; Secor, Carol ; Mayden, Richard ; Shiozawa, Dennis ; Smith, Gerald. / Influence of Introgression and Geological Processes on Phylogenetic Relationships of Western North American Mountain Suckers (Pantosteus, Catostomidae). In: PLoS One. 2014 ; Vol. 9, No. 3. pp. 1-17.
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Influence of Introgression and Geological Processes on Phylogenetic Relationships of Western North American Mountain Suckers (Pantosteus, Catostomidae). / UNMACK, Peter; Dowling, Thomas; Laitinen, Nina; Secor, Carol; Mayden, Richard; Shiozawa, Dennis; Smith, Gerald.

In: PLoS One, Vol. 9, No. 3, 2014, p. 1-17.

Research output: Contribution to journalArticle

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