ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment213,835 square kilometers based on Natural Heritage Program range maps that appear on the Montana Field Guide.
Area of Occupancy
ScoreU - Unknown
ScoreE - Relatively Stable (±25% change)
CommentSagebrush covertypes probably drastically reduced since European arrival, but shrubby habitats have probably increased in forested areas as a result of timber harvest. Overall longterm trend may best be categorized as stable to within +/-25%.
ScoreD - Declining. Decline of 10-30% in population, range, area occupied, and/or number or condition of occurrences
CommentBBS data is of moderate credibility with a significant negative trend of -3.7% per year or -32% per decade. BBS data for the Northern Rocky Mountains is of highest credibility and shows a nonsignificant trend of -1.1% per year or 11% decline per decade. Probably best regarded as declining at 10-30% over the short-term.
ScoreF - Widespread, low-severity threat. Threat is of low severity but affects (or would affect) most or a significant portion of the population or area.
CommentHabitat loss from sagebrush removal and fire suppression in conifer forests that reduces shrub regrowth both represent potential threats to the species.
SeverityLow - Low but nontrivial reduction of species population or reversible degradation or reduction of habitat in area affected, with recovery expected in 10-50 years.
CommentAlthough sagebrush covertypes take a long time to recover other shrub species tend to respond relatively quickly to disturbance and the species should be able to respond quickly to this shrub regeneration.
ScopeModerate - 20-60% of total population or area affected
Comment20-60% of the population is likely being impacted by habitat loss or alteration or fire suppression
ImmediacyModerate - Threat is likely to be operational within 2-5 years.
ScoreC - Not Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance; or species has high dispersal capability such that extirpated populations soon become reestablished through natural recolonization (unaided by humans).
ScoreC - Moderate. Generalist. Broad-scale or diverse (general) habitat(s) or other abiotic and/or biotic factors are used or required by the species but some key requirements are scarce in the generalized range of the species within the area of interest.
CommentSpecies uses a variety of shrubby habitats in shrub steppe or disturbed and regenerating forest areas.
Raw Conservation Status Score
3.5 + 0.0 (geographic distribution) + 0.0 (environmental specificity) - 0.25 (short-term trend) + 0.0 (threats) = 3.25
How Scores are Calculated