Montana Field Guide

Population Size

Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

CommentEstimated. Population data are needed.

Range Extent

Score2 - Regional or State Endemic or Small Montana Range: Generally restricted to an area <100,000 sq. miles (equivalent to 2/3 the size of Montana or less) or Montana contributes 50% or more of the species’ range or populations OR limited to 2-3 Sub-basins in Montana.

Area of Occupancy

Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

CommentSurveys for additional occurrences are needed.

Environmental Specificity

Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).

Trends

Score1-3 - Declining: Species is likely declining though the magnitude of declines is uncertain. Declines may be based upon range extent and/or occupied area in the recent past (approximately 30 years).

CommentTrends are unknown. However, the taxa's habitat has been used for agricultural and ranching purposes, as such, it seems likely that some loss of habitat has occurred.

Threats

Score1-2 - Medium to High.

CommentInformation on potential threats for known locations have not been collected. Invasive species and land-use practices are potential threats within the species' habitat.

Intrinsic Vulnerability

Score0-1 - Low to Moderate Vulnerability.

Raw Conservation Status Score

Score 9 to 13 total points scored out of a possible 19.