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Estimation of wildlife population ratios incorporating survey design and visibility bias

Journal of Wildlife Management

By:
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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.

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Additional Publication Details

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