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Great Basin Spadefoots (Spea intermontana) were first detected during auditory surveys in the south Cariboo in 2006, and again, in auditory surveys conducted in 2007. In 2008, we conducted additional auditory surveys primarily to further document the distribution of Great Basin Spadefoots in the Cariboo Region of British Columbia. Calls of Western Toads (Bufo boreas), Wood Frogs (Rana sylvatica), Pacific Chorus Frogs (Pseudacris regilla) and Columbia Spotted Frogs (Rana luteiventris) were also recorded when detected. Surveys were conducted from the shoreline of ponds and were a minimum of 15 minutes in duration. Two hundred and fifty-five auditory surveys were conducted at 361 different sites between April 12 and June 24, 2008. One hundred and twenty of the 361 sites contained 1 or more target amphibians. Spadefoots were detected at 54 sites (15.0%), Western Toads at 16 (4.4%), Wood Frogs at 43 (11.9%), and Pacific Chorus Frogs at 7 sites (1.9%). Spadefoots were detected calling from May 5 to June 16, 2008. Spadefoots were detected at 12 sites where Western Toads and/or Wood Frogs were also detected. We did not detect Columbia Spotted Frogs at any sites surveyed. However, because the calls of Columbia Spotted Frogs are low-pitched, with little carrying power, not detected does not necessarily mean not present. Likewise, although amphibians were not detected at 241 sites, not detected does not necessarily equate to no amphibians present. Thirteen spadefoot Wildlife Habitat Areas (WHAs) were proposed to conserve spadefoot breeding habitat.
Kline, J, Packham, R.. 2009. Great Basin Spadefoot (Spea intermontana) Auditory Surveys in the Cariboo Region of British Columbia, 2008. Ministry of Environment
English Name: Great Basin Spadefoot, Wood Frog, Western Toad, Columbia Spotted Frog, Pacific Treefrog
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