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Hybridization between the southwestern toad (Bufo microscaphus) and Woodhouse's toad (B. woodhousii) along the Agua Fria and Hassayampa rivers in central Arizona was investigated over a 3-yr period. Variation in allozymes and the pulse rate of male release calls was compared with morphological variation in these taxa and their hybrids. At two sites on the Agua Fria drainage, data on release calls, but not morphology, were concordant with allozyme evidence of hybridization. At a third site on the Agua Fria, morphological data, but not release calls, corroborated electrophoretic evidence of hybridization. Along the Hassayampa River, all lines of evidence indicated that there has not yet been any hybridization in an...
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These data are the result of two years of pond-breeding amphibian visual encounter surveys conducted across a range of pond types (from highly ephemeral to permanent hydrology) in Mount Rainier, North Cascades, and Olympic National Parks. The R code includes well-annotated code for reorganizing and sub-setting the master data, which should make it much easier to work with than the raw spreadsheet. Associated hydrologic data may be of use for other research applications. Recognize that this amphibian dataset is tied to (1) hydrologic projections developed using the Variable Infiltration Capacity model, which provides historical reconstructions of hydroperiod for most of 20th century and future hydrologic projections...
The Anaxyrus boreas species group currently comprises four species in western North America including the broadly distributed A. boreas, and three localized species, Anaxyrus nelsoni, Anaxyrus exsul and Anaxyrus canorus. Phylogenetic analyses of the mtDNA 12S rDNA, cytochrome oxidase I, control region, and restriction sites data, identified three major haplotype clades. The Northwest clade (NW) includes both subspecies of A. boreas and divergent minor clades in the middle Rocky Mountains, coastal, and central regions of the west and Pacific Northwest. The Southwest (SW) clade includes A. exsul, A. nelsoni, and minor clades in southern California. Anaxyrus canorus, previously identified as paraphyletic, has populations...


    map background search result map search result map Amphibian Occupancy in Ponds in Olympic, Mount Rainier, and North Cascades National Parks: amphibian presence, site, and survey attributes, 2012-2013 Amphibian Occupancy in Ponds in Olympic, Mount Rainier, and North Cascades National Parks: amphibian presence, site, and survey attributes, 2012-2013