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Tag loss can bias Jolly-Seber capture-recapture estimates

Wildlife Society Bulletin

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Abstract

We identified cases where the Jolly-Seber estimator of population size is biased under tag loss and tag-induced mortality by examining the mathematical arguments and performing computer simulations. We found that, except under certain tag-loss models and high sample sizes, the population size estimators (uncorrected for tag loss) are severely biased high when tag loss or tag-induced mortality occurs. Our findings verify that this misconception about effects of tag loss and tag-induced mortality could have serious consequences for field biologists interested in population size. Reiterating common sense, we encourage those engaged in capture-recapture studies to be careful and humane when handling animals during tagging, to use tags with high retention rates, to double-tag animals when possible, and to strive for the highest capture probabilities possible.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tag loss can bias Jolly-Seber capture-recapture estimates
Series title:
Wildlife Society Bulletin
Volume
31
Issue:
3
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
814
Last page:
822
Number of Pages:
9