Estimation of wildlife population ratios incorporating survey design and visibility bias
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Abstract
Age and sex ratio statistics are often a key component of the evaluation and management of wildlife populations. These statistics are determined from counts of animals that are commonly plagued by errors associated with either survey design or visibility bias. We present age and sex ratio estimators that incorporate both these sources of error and include the typical situation that animals are sampled in groups. Aerial surveys of elk (Cervus elaphus) in northcentral Idaho illustrate that differential visibility of age or sex classes can produce biased ratio estimates. Visibility models may be used to provide corrected estimates of ratios and their variability that incorporates errors due to sampling, visibility bias, and visibility estimation.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Estimation of wildlife population ratios incorporating survey design and visibility bias |
| Series title | Journal of Wildlife Management |
| Volume | 56 |
| Issue | 4 |
| Year Published | 1992 |
| Language | English |
| Contributing office(s) | National Wildlife Health Center |
| Description | p. 718-725 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Wildlife Management |
| First page | 718 |
| Last page | 725 |
| Country | United States |
| State | Idaho |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |