We also confirmed that the pilose crayfishes are morphologically distinct relative to each other, with P. gambelii represents a monophyletic lineage of extremely low genetic diversity distributed primarily in the upper Snake River watershed and adjacent Bonneville Basin. connectens represents a diverse polytomy of multiple lineages distributed in the middle Snake River watershed and adjacent Harney Basin, whereas P.
#Pearsons history and geography tests westward expansion series#
Next, we made a series of morphological measurements on crayfish specimens, which we analyzed as morphological ratios in a principal component analysis. We sequenced the mitochondrial cytochrome c oxidase subunit I gene of these crayfish specimens and then built Bayesian and maximum likelihood phylogenetic trees on these sequence data. We conducted our analyses on voucher specimens recently collected from across the presumed native ranges of both pilose crayfish species. gambelii occur relative to each other as well as morphological analyses that sought to help nonspecialists reliably identify these species in the field. We report results of molecular analyses that sought to clarify where P. The Snake River pilose crayfish Pacifastacus connectens and pilose crayfish Pacifastacus gambelii are sister species endemic to western North America that require increased conservation attention due to apparent range declines. Layers depicting the Cordilleran ice sheet (light gray) and Glacial Lake Missoula and its fl ood waters (both dark gray) were generously provided by Hiroo Imaki (NOAA) from Waples et al. Summary of geologic history in the Paci fi c Northwest region of North America, with an emphasis on: ( a ) the Puget Lobe of the Cordilleran ice sheet ( b ) the Okanagan Lobe ( c ) the Purcell Lobe ( d ) the Brooks Peninsula on Vancouver Island, a hypothesized coastal glacial refugium ( e ) Glacial Lake Missoula ( f ) fl ooded extent from Glacial Lake Missoula ( g ) faunal exchange via stream capture between the Chehalis glacial refugium and Puget Sound trough caused by glacial meltwater ( h ) stream capture between the Okanagan River (tributary to Columbia River glacial refugium) and Thompson River (Fraser River tributary) ( i ) stream capture between the Willamette River (Columbia tributary) and coastal Siuslaw River ( j ) stream capture between the Willamette River and Umpqua River ( k ) faunal exchange between Bonneville closed basin and upper Snake River ( l ) faunal exchange via stream capture between the Harney Basin and Malheur River (Snake River tributary) ( m ) hypothesized stream capture between the Harney Basin and John Day River (Columbia River tributary) ( n ) stream capture of Snake River into Columbia River ( o ) possible past route of Snake River through Humboldt Basin to Sacramento River of California ( p ) possible ‘ fi shhook’ extension of Snake River to Klamath River ( q ) possible past connectivity of Goose Lake Basin to Pit River (Sacramento River tributary) ( r ) possible past connectivity of Goose Lake Basin to Klamath River ( s ) possible past connectivity of Goose Lake Basin to Harney Basin ( t ) location of Shoshone Falls ( u ) location of Celilo Falls.
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