Translator Disclaimer
1 September 2007 Evaluation of Accuracy and Precision of Downing Population Reconstruction
Author Affiliations +
Abstract

Downing population reconstruction uses harvest-by-age data and backward addition of cohorts to estimate minimum population size over time. Although this technique is currently being used for management of black bear (Ursus americanus) and white-tailed deer (Odocoileus virginianus) populations, it had not undergone a rigorous evaluation of accuracy. We used computer simulations to evaluate the impacts of collapsing age classes and violating the assumptions of this technique on population reconstruction estimates and trends. Changes in harvest rate or survival over time affected accuracy of reconstructed population estimates and trends. The technique was quite robust to collapsing age classes as far as 3 for bears and deer. This method would be suitable for estimating population growth rate (λ) for populations experiencing no trend in harvest rate or natural mortality rate over time. Our evaluation showed Downing population reconstruction to be a potentially valuable tool for managing harvested species with high harvest rates and low natural mortality, with possible application to black bear and white-tailed deer populations.

MICHELLE L. DAVIS, JIM BERKSON, DAVID STEFFEN, and MARY K. TILTON "Evaluation of Accuracy and Precision of Downing Population Reconstruction," Journal of Wildlife Management 71(7), 2297-2303, (1 September 2007). https://doi.org/10.2193/2006-427
Published: 1 September 2007
JOURNAL ARTICLE
7 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top