Thirty years of hybridization between toads along the Agua Fria River in Arizona: I. Evidence from morphology and mtDNA

Brian Sullivan, Jessica Wooten, Terry D. Schwaner, Keith O. Sullivan, Mizuki Takahashi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The Arizona Toad (Bufo " = Anaxyrus" microscaphus) occupied the entire Agua Fria River drainage in central Arizona until relatively recently. By the 1980s, a close relative, Woodhouse's Toad (Bufo woodhousii), colonized the lower reaches of the Agua Fria and replaced B. microscaphus at some sites. We tested the hypothesis that habitat disturbance drives replacement of B. microscaphus by B. Woodhousii, via hybridization, by examining shifts in the distribution of these toads following the expansion of the Waddell Dam on the lower Agua Fria River in the early 1990s. As of 2010, the high elevation headwaters of the Agua Fria River were still occupied by B. microscaphus, the lower reaches near the confluence with the Gila River were occupied by B. Woodhousii, and along the middle reaches, hybridization between these two anurans occurred at the same three sites as documented in the early 1990s. Contrary to expectations, evidence of hybridization along middle reaches of the river is largely unchanged: B. microscaphus has not been replaced by B. Woodhousii at any additional sites nor is there any evidence of introgression of woodhousii mtDNA into putatively "puremicroscaphus populations upstream of hybrid sites.

Original languageEnglish (US)
Pages (from-to)150-156
Number of pages7
JournalJournal of Herpetology
Volume49
Issue number1
DOIs
StatePublished - Mar 1 2015

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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