Temporal stability in hybridization between Bufo microscaphus and Bufo woodhousii (Anura: Bufonidae): behavior and morphology

I analyzed temporal variation in hybridization between the southwestern toad (Bufo microscaphus) and Woodhouse's toad (Bufo woodhousii) along the Virgin River in southwestern Utah and northwestern Arizona. Bufo woodhousii is largely restricted to the floodplain of the Virgin River from southern Nevada to the vicinity of St. George, Utah. By contrast, B. microscaphus is confined primarily to the tributaries of the Virgin River, only occupying the Virgin River proper exclusive of B. woodhousii along its upper reaches east of La Verkin Creek. As in all other zones of sympatry for these bufonids, behavior and morphology provide clear evidence of hybridization at a number of sites along the Virgin River. Analysis of...

Categories: Publication; Types: Citation, Journal Citation; Tags: Bufo microscaphus, Bufo woodhousii, Journal of Evolutionary Biology, Virgin River, call variation, All tags... hybridization, hyrbid zone, Fewer tags