The mountain beaver is listed as Lower Risk/Near Threatened as a species. However, two of its seven subspecies (A. r. phaea and A. r. nigra) are listed as Vulnerable by IUCN, in part because of habitat loss and also because these are small isolated populations in California disjunct from the principal range of the species. The U. S. Fish and Wildlife Service lists A. r. nigra as Endangered. Elsewhere, the mountain beaver is secure, but local extirpations can occur. From a jurisdictional perspective in Canada, A. r. rufa could be considered threatened because it has been lost from most of its range in British Columbia due to urbanization and agriculture. However, from a broader geographic perspective, this could be regarded as little more than an emargination of its range in the Pacific Northwest.
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