The effect on model identifiability of allowing different relocation rates for live and dead animals in the combined analysis of telemetry and recapture data |
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Authors: | Email author" target="_blank">Marlina?D?NasutionEmail author Cavell?Brownie Kenneth?H?Pollock Roger?A?Powell |
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Institution: | (1) Department of Life Sciences, Ben-Gurion University of the Negev, 84105 Beer Sheva, Israel;(2) Department of Life Sciences, Ben-Gurion University of the Negev, POB 653, 84105 Beer Sheva, Israel |
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Abstract: | Models are described for the joint analysis of live-trapping and radio telemetry data from a study on black bears (Ursus americanus) in which all animals received ear tags and a subset also received radio tags. Concerns about bias in survival estimates
led to investigation of identifiability and estimator precision for a series of models that allowed differenttelemetry relocation
rates for living and dead animals, in addition to emigration and seasonal variation in survival. Identifiability was determined
by showing that the expected information matrix was nonsingular. Models with fidelity constant across time, and with the same
degree of time specificity for survival rates and relocation rates for dead animals, were determined to be nonidentifiable.
More general models, with a greater degree of time specificity for survival rates, were near-singular, and estimators under
these near-singular models had poor precision. Analysis of data from the study on black bears illustrated that estimates of
survival have poor precision when relocation rates are estimated separately for live and dead animals. It is recommended that
the effort expended to relocate both living and dead animals be consistently high in each telemetry survey, so that relocation
rates will be high and constant across time and mortality status. |
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