Whitebark Pine (Pinus albicaulis) Conservation Status Review
Review Date = 06/01/2012
Score0 - Large: Generally >100,000 individuals.
Score0 - Widespread species within Montana (occurs in 5% or more of the state or generally occurring in 6 or more sub-basins.) as well as outside of Montana.
Area of Occupancy
Score0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s).
Score3 - Severe Declines: Species has experienced declines of >50% in population size, range extent and/or occupied area in the recent past (approximately 30 years)
CommentWhitebark Pine has declined significantly due to blister rust and mountain pine beetle attacks. Encroachment by other conifers and disruption of natural fire cycles have also contributed to the declining trends.
Score3 - Very High: >70% of the populations are being negatively impacted or are likely to be negatively impacted in the near future by one or more activities or agents that are expected to result in decreased populations and/or decreasing habitat quality and/or quantity.
CommentWhite Pine Blister Rust is the primary threat to the species' viability.
Score2 - High Vulnerability: Very specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species highly susceptible to extirpation from stochastic events or other adverse impacts to its habitat and very slow to recover.
CommentLong time span to reproductive maturity.
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).
Raw Conservation Status Score
9 total points scored out of a possible 19.