Analysis of error from cementum-annuli age estimates of known-age Pennsylvania black bears

Article Abstract:

The ages of cementum annuli counts of teeth from Pennsylvania black bears were estimated and compared to their known age. Overall, 8.1% of the known-age teeth were aged incorrectly and no differences in error distributions between sexes were found. Incorrectly aged teeth were aged incorrectly because of irregular tooth characteristics to which standardized aging criteria could not be applied accurately. The results implied that counting cementum annuli is a valid technique for aging Pennsylvania black bears.

Teeth, Age determination (Zoology), Age determination (Biology)

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Modeling and evaluation of ear tag loss in black bears

Article Abstract:

Permanently marked or tattooed black bears were used to model ear tag loss rates and identify bears recovered missing both ear tags. Findings showed that ear tag loss in male bears increased with time between tagging and recovery and that the probability of losing a second ear tag was greater if one ear tag was already lost. Comparison of survival estimates with and without a correction for ear tag loss suggested uncorrected annual survival estimates may be biased for both males and females.

Identification and classification, Wildlife research, Animal marking, Animal tagging

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Effect of undercounting and model selection on a sightability-adjustment estimator for elk

Article Abstract:

Estimates of wildlife populations using aerial surveys must take into account failure to observe all animals and many methods have been developed to correct such biases. A new study investigates the effect of under-counting in an elk herd in Pennsylvania using a sightability model. The study shows that careful selection of sightability models is crucial if accurate estimations are to be obtained.

Models, Estimation theory, Elk, Elk (Wapiti)

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