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Presented at the NABS Annual meeting, Pittsburgh, Pennsylvania, 2002
in Population Distribution: Studies of Dispersal, Behavior, and Genetics I
THE INTERBASIN DISPERSAL OF CUTTHROAT TROUT - COMPARING PHYLOGENETIC RELATIONSHIPS AND GEOLOGICAL HISTORY.
D.K. Shiozawa1,2 and R.P. Evans1. 1Department of Zoology, Brigham Young University, Provo, Utah 84602, 2Monte L. Bean Life Science Museum, Brigham Young University, Provo, UT 84602
The dispersal of fishes in western North America has been tied to various known geological events (stream captures). For instance the Bluehead sucker (Catostomidae), of the Colorado River system, is known to have gained access to the Bonneville Basin through at least three separate stream capture events associated with the upper Green River and Bear River of southwestern Wyoming. The transfer of the Bear River into the Bonneville Basin in the late Pleistocene has also been projected as the route of entrance of cutthroat trout into the Bonneville Basin. However phylogenetic interrelationships of cutthroat trout, as developed by restriction site mapping of mitochondrial DNA, indicates that late Pleistocene dynamics are insufficient to describe the relationships among the subspecies. Not only are some of the classically assumed derived taxa actually basal to the evolution of the cutthroat trout, but some reticulation events have also occurred, indicating multiple invasions into some of the basins.
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