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Investigations of potential bias in the estimation of lambda using Pradel's (1996) model for capture-recapture data

EURING 2000 Conference, Point Reyes, California, October 1-7. PDF on file: 5829_Hines.pdf
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Abstract

Pradel's (1996) temporal symmetry model permitting direct estimation and modelling of population growth rate, lambda sub i provides a potentially useful tool for the study of population dynamics using marked animals. Because of its recent publication date, the approach has not seen much use, and there have been virtually no investigations directed at robustness of the resulting estimators. Here we consider several potential sources of bias, all motivated by specific uses of this estimation approach. We consider sampling situations in which the study area expands with time and present an analytic expression for the bias in lambda hat sub i. We next consider trap response in capture probabilities and heterogeneous capture probabilities and compute large-sample and simulation-based approximations of resulting bias in lambda hat sub i. These approximations indicate that trap response is an especially important assumption violation that can produce substantial bias. Finally, we consider losses on capture and emphasize the importance of selecting the estimator for lambda sub i that is appropriate to the question being addressed. For studies based on only sighting and resighting data, Pradel's (1996) lambda hat prime sub i is the appropriate estimator.

Additional Publication Details

Publication type:
Book chapter
Publication Subtype:
Book Chapter
Title:
Investigations of potential bias in the estimation of lambda using Pradel's (1996) model for capture-recapture data
Year Published:
2002
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
669
Larger Work Type:
Book
Larger Work Subtype:
Other Government Series
Larger Work Title:
Statistical analysis of data from marked bird populations
First page:
573
Last page:
587