@ARTICLE{TreeBASE2Ref25999, author = {Craig A. Steele and Andrew Storfer}, title = {Phylogeographic incongruence of codistributed amphibian species based on small differences in geographic distribution.}, year = {2007}, keywords = {AU test; Bayesian hypothesis testing; Biogeography; Columbia River; Comparative phylogeography; Dicamptodon; PaciWc Northwest parametric bootstrap; Plethodon; SH test}, doi = {10.1016/j.ympev.2006.10.010}, url = {http://}, pmid = {}, journal = {Molecular Phylogenetics and Evolution}, volume = {43}, number = {}, pages = {468--479}, abstract = {Codistributed species may display either congruent phylogeographic patterns, indicating similar responses to a series of shared climatic and geologic events, or discordant patterns, indicating independent responses. This study compares the phylogeographic patterns of two similarly distributed salamander species within the PaciWc Northwest of the United States: Cope?s giant salamander (Dicamptodon copei) and Van Dyke?s salamander (Plethodon vandykei). Previous studies of P. vandykei support two reciprocally monophyletic lineages corresponding to coastal populations, located from the Olympic Mountains to the mouth of the Columbia River, and inland populations within the Cascade Mountains. We hypothesized that D. copei would have a congruent phylogeographic pattern to P. vandykei due to similarity in distribution and dependence upon similar stream and stream-side habitats. We test this hypothesis by estimating the phylog- eny of D. copei using ?1800 bp of mitochondrial DNA and comparing it to that of P. vandykei. Sympatric populations of D. copei and of P. vandykei display an identical phylogeographic pattern, suggesting similar responses within their shared distribution. Populations of D. copei occurring outside the range of P. vandykei displayed high levels of genetic divergence from those sympatric to P. vandykei. Overall, phylogeographic patterns between the two species were ultimately incongruent due to the high divergence of these allopatric populations. These results provide an example of codistributed species displaying overall incongruent phylogeographic patterns while simultaneously displaying congruent patterns within portions of their shared geographic distribution. This pattern demonstrates that a simple dichotomy of congruent and incongruent phylogeographic patterns of codistributed species may be too simplistic and that more complex intermedi- ate patterns can result even from minor diVerences in species? ranges.} }

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