Evaluation of Mark-Resight Model Assumptions for Estimating Mountain Sheep Numbers
| Autor: | Gary C. White, Andrea K. Neal, Dale F. Reed, R. Bruce Gill, James H. Olterman |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Accuracy and precision
Ecology Aerial survey symbols.heraldic_supporter Confidence interval Hypergeometric distribution Mountain sheep cvg.developer Statistics Herd symbols General Earth and Planetary Sciences cvg Mark resight Ecology Evolution Behavior and Systematics Ovis canadensis Nature and Landscape Conservation General Environmental Science Mathematics |
| Zdroj: | The Journal of Wildlife Management. 57:436 |
| ISSN: | 0022-541X |
| DOI: | 10.2307/3809268 |
| Popis: | Mark-resight methods have been used to estimate numbers of mountain sheep (Ovis canadensis canadensis), but no evaluation has been made of potential bias or precision of estimates. We simulated the mark-resight procedure, including simulations with violations of several assumptions, using the joint maximum likelihood estimator from a hypergeometric distribution (JHE). We also conducted a field study with a mountain sheep herd near Trickle Mountain, Colorado. These field data, particularly estimates of heterogeneity of individual sighting probabilities and group sizes, were used to provide realistic simulation distributions. Aggregation of animals did not bias the estimate but did decrease precision and confidence interval (CI) coverage |
| Databáze: | OpenAIRE |
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