Population estimate of black bears (Ursus americanus) in Crater Lake National Park using non-invasive methods
George TL. 2012. Population estimate of black bears (Ursus americanus) in Crater Lake National Park using non-invasive methods. Arcata, CA
From the Introduction: Several non-invasive methods have recently been developed to estimate population size of uncommon or reclusive species. These approaches provide many advantages over traditional methods of abundance that either do not provide estimates of true population parameters (e.g. uncorrected visual surveys, track counts, scat counts), are expensive and labor intensive (capture-mark-recapture, radiotelemetry, satellite telemetry), or require harvest of a substantial number of individuals (population reconstruction). In order to obtain accurate estimates with non-invasive methods, however, it is important to use sampling methods that are unbiased and provide sufficient information to examine all potential sources of variation in detection probabilities. In this report, I examine data collected from a hair-snare survey conducted in to estimate the population size of black bears (Ursus americanus) in Crater Lake National Park. In addition, I provide recommendations to improve estimates in future surveys.
- Type
- Unpublished Report
- Authors
- George, T.
- Date of Issue
- 2012-08-03
- Units
- CRLA
- Keywords
- Black Bears, Crater Lake National Park, hair snares, non-invasive methods, Sampling Methods, Ursus americanus
- Subjects
- Ecological Framework: Biological Integrity | Focal Species or Communities | Forest/Woodland Communities