Status history: The species was considered a single unit and designated Special Concern in November 2002.
Occurrence: Yukon, Northwest Territories, British Columbia, Alberta The species remains widespread, but declines are suspected and projected based on known vulnerabilities and threats. Life history characteristics, including infrequent breeding by females, aggregation at communal, traditionally used breeding sites, and migrations to and from breeding sites, make populations vulnerable to habitat degradation and fragmentation. It is relatively intolerant of urban expansion, conversion of habitat for agricultural use, and habitat fragmentation resulting from resource extraction and road networks.
The toads are particularly sensitive to emerging skin disease caused by the amphibian chytrid fungus, which has been linked to global amphibian declines. Reason for designation: This species has suffered population declines and population extirpations in the southern part of its range in British Columbia, as well as in the USA. SloughĬommon name: Western Toad - Non-calling population Western Toad tadpoles on silty substrate of Lindeman Creek delta on Lindeman Lake, northwestern B.C. Black band near the shoreline is composed of 1000s of tadpoles. Mass-breeding site of the Western Toad in the Thompson-Nicola area, B.C. Mass breeding site of Western Toads in flooded shallows of Tutshi River Delta, Tutshi River, northwestern B.C. Canadian distribution of the Western Toad and Mexican range based on a map compiled by International Union for Conservation of Nature (IUCN) Map prepared by Rob Gau, Northwest Territories Department of Environment and Natural Resources U.S. Western Toad eggs (left) and tadpoles (right) from Thompson-Nicola area, B.C. Adult male Anaxyrus boreas from northwestern British Columbia. Acknowledgements and authorities contacted.Extent of occurrence and area of occupancy.Population spatial structure and variability.Wildlife species description and significance.Technical summary – non-calling population.Committee on the Status of Endangered Wildlife in Canada (COSEWIC) assessment summary.
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