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Within-species variation is a key for north temperate fish communities that are species-poor but rich in intra-specific variation as a result of repeated glaciations over the last two million years. In BC, complex patterns of glacial coverage and freshwater refugia have resulted in major phylogenetic subdivisions in many of its native species. Phylogentic divergence was documented in the rainbow trout, Oncorhynchus mykiss, using mitochondrial DNA (mtDNA) to address questions regarding its biogeographical history and conservation. A restriction fragment length ploymorphism (RFLP) analysis was conducted of mtDNA including populations throughout BC as well as from Alaska, Kamchatka, the northwestern U.S. and Alberta. Two distinct mtDNA lineages were revealed which overlap extensively in their geographical range. These data are combined with previous data on glacial history and molecular variation to generate a comprehensive hypothesis on the origins of rainbow trout populations in BC. These data suggest that the
McCusker, Megan R., Parkinson, Eric A.; Taylor, Eric B.. 2000. Phylogenetic Conservation Units for Rainbow Trout in British Columbia. Fisheries Management Report. FMR112
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