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Single season estimates of polar bear numbers using mark resighting methods: Draft

Summary

Type of release
a one-off release of a single dataset

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Release Date
17 June 2015
Modified Date
27 August 2015
Publishers
US Fish and Wildlife Service, Department of the Interior
Keywords
inventory, mammals, population-dynamics
Identifier
single-season-estimates-of-polar-bear-numbers-using-mark-resighting-methods-draft
Landing Page
http://catalog.data.gov/dataset/single-season-estimates-of-polar-bear-numbers-using-mark-resighting-methods-draft
Maintainers
Richard Easterbrook richard_easterbrook@fws.gov

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Description

Seveneight bears comprising fiftytwo independent groups were marked during the study from 17 March to 28 April. An additional 22 bears were sighted but not marked appendix 1. The different analytical procedures give results varying from negative estimates to 320 bears in the study areas. The Schnabel estimate procedure was of 320 bears or 215 groups Appendix 2. The Marten estimation procedure yielded negative results Appendix 3, as did the estimates using the change in ratio procedure Appendix 4. The SeverJolly procedure estimated a population for each three day sample period which ranged from 17 to 150 individuals or 13 to 45 groups Appendix 5.

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