Canyon Wren (Catherpes mexicanus) Conservation Status Review
Review Date = 12/22/2011
ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment249,529 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)
CommentRocky cliffs or rock outcrops have remained stable (+/- 25%) since European arrival.
ScoreU/E - Unknown, but believed to be stable with population, range, area occupied, and/or number or condition of occurrences unchanged or remaining within ±10% fluctuation
CommentBBS data for Montana is nonexistent and it is poor for surrounding states. For Northern Rockies BBS data is of low quality and insignificant, but shows a +0.6% increase per year or 6% increase per decade.
ScoreG - Slightly threatened. Threats, while recognizable, are of low severity, or affecting only a small portion of the population or area.
CommentLocalized habitat loss from quarries and localized disturbance from rock climbers are the only threats we were able to identify. However, we believe these are fairly insignificant impacts.
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.
CommentRock climbing and quarrying are ephemeral activities that the species could recover from quickly.
ScopeLow - 5-20% of total population or area affected
CommentRock climbing and quarrying occur on a fairly small portion of rock outcrops and canyons used by Canyon Wrens.
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).
CommentNot Intrinsically Vulnerable. Species matures quickly, reproduces frequently, and/or has a high fecundity such that populations recover quickly (< 5 years or 2 generations) from decreases in abundance. Species has good dispersal capabilities such that extirpated populations generally become reestablished through natural recolonization.
ScoreB - Narrow. Specialist. Specific habitat(s) or other abiotic and/or biotic factors (see above) are used or required by the Element, but these key requirements are common and within the generalized range of the species within the area of interest.
CommentNarrow Specialist. Species uses cliffs, steep-sided canyons, rocky outcrops, and boulder piles, usually in arid regions.
Raw Conservation Status Score
3.5 + 0.0 (geographic distribution) + 0.0 (environmental specificity) + 0.0 (short-term trend) + 0.75 (threats)