This species status report describes the distribution, habitat, biology, population size and trends, limiting factors and threats, existing protection or species designations, significance of the species. The Great Basin Pocket Mouse inhabits the Columbia Plateau, Colorado Plateau, and Great Basin of western North America. In Canada, where it is at its northern limits, it is restricted to the intermontane region of southern British Columbia and inhabits native grassland and shrub?steppe communities in valleys and hillsides up to 1370 m elevation. Loose sandy soil with a shrub cover of antelope-brush and big sagebrush and grasses are the ideal habitat. However, this rodent also survives in habitats disturbed by fire and livestock grazing or habitats dominated by alien plants such as cheatgrass. Three isolated subpopulations occur in Canada: the south Okanagan?Kettle, north Okanagan, and Thompson River valley. These subpopulations have probably been isolated since the mid Holocene. The north Okanagan and Thompson subpopulations are known only from historical museum specimens taken more than 50 years ago; inventories are needed to determine if the Great Basin Pocket Mouse is still extant in these regions. In the south Okanagan, recent research has shown that this species is widespread and abundant, reaching densities of 74 animals per hectare in some habitats. The Great Basin Pocket Mouse is not listed as an Identified Wildlife Species and has no protection under the current British Columbia Provincial Forest Practices Code. Its habitat is protected only in provincial and federal conservation lands. None of the historical records from the north Okanagan and Thompson subpopulations are within the boundaries of existing protected areas; about 12% of the range of the south Okanagan?Kettle subpopulation is protected in provincial and federal conservation lands.
Nagorsen, David. 2004. Status of the Great Basin Pocket Mouse (Perognathus parvus) in British Columbia. Ministry of Environment. Wildlife Working Report. WR 117
Topic: Species Status
Keywords: bc, species status, species conservation
Scientific Name: Perognathus parvus
English Name: Great Basin Pocket Mouse
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