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- Title
Problems with Avian Point Counts for Estimating Density of Northern Bobwhite--A Case Study.
- Authors
Applegate, Roger D.; Kissell, Robert E.; Moss, E. Daniel; Warr, Edward L.; Kennedy, Michael L.
- Abstract
Point count data are used increasingly to provide density estimates of bird species. A favored approach to analyze point count data uses distance sampling theory where model selection and model fit are important considerations. We used uniform and half normal models and assessed model fit using χχ2 analysis. We were unsuccessful in fitting models to 635 northern bobwhite observations from 85 avian point locations spanning 6 y ( P ≤≤ 0.05). Most observations (74%%) occurred in the outermost (>100-m) distance radius. Our results violated the assumptions that all observations at the point are detected. The assumption that birds were assigned to the correct distance interval also was probably violated. We caution managers in implementing avian point counts with distance sampling when estimating northern bobwhite population density. We recommend exploring other approaches such as occupancy-estimation and modeling for estimating detection probabilities.
- Subjects
NORTHERN bobwhite; POPULATION density; BIRD population estimates; BOBWHITES; ANIMAL populations
- Publication
Journal of Fish & Wildlife Management, 2011, Vol 2, Issue 1, p117
- ISSN
1944-687X
- Publication type
Article
- DOI
10.3996/092010-JFWM-033