ScoreU - Unknown
ScoreG - 200,000-2,500,000 km squared (about 80,000-1,000,000 square miles)
Comment380525 square kilometers based on Natural Heritage Program range maps
Area of Occupancy
ScoreG - 2,000-20,000 km squared (500,000-5,000,000 acres)
Comment5908 square kilometers based on GAP predicted model.
ScoreE - Relatively Stable (±25% change)
CommentRiparian deciduous and mixed deciduous forests relatively stable since European arrival.
ScoreE - Stable. Population, range, area occupied, and/or number or condition of occurrences unchanged or remaining within ±10% fluctuation
CommentBreeding Bird Survey (BBS) has moderate credibility in Montana and shows an increase of 0.5% per year since 1980 which is a 5 percent increase over a 10 year time period.
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.
CommentLoss of regeneration of cottonwood forests due to altered hydrology and grazing. Cowbirds.
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.
CommentHabitat would likely recover in 10-50 years if hydrology and grazing impacts reduced
ScopeHigh - > 60% of total population or area affected
CommentA high percentage of deciduous riparian bottomlands are being impacted.
ImmediacyModerate - Threat is likely to be operational within 2-5 years.
CommentOngoing but could accelerate
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).
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.
CommentRiparian deciduous forest specialist