Evaluation of a Mark-Resighting Technique for Woodland Caribou in Newfoundland

Journal of Wildlife Management
Author(s): 
Shane P. Mahoney, John A. Virgl, David W. Fong, Andrea M. MacCharles, Michael McGrath

The authors evaluated properties of the Petersen mark-resight technique for estimating the population size of 6 woodland caribou (Rangifer tarandus) herds in Newfoundland. The authors' objective was to determine the robustness and efficiency of a novel marking technique for estimating population size of caribou where sightability bias is marginal. We marked caribou with pressurized oil-alkyde paint applied from a helicopter. Resighting surveys were conducted 2-3 weeks later. Data from 15 radiocollared animals indicated populations were closed and marks were not lost.

Body Size Variations in Caribou Ecotypes and Relationships With Demography

Journal of Wildlife Management
Author(s): 
Serge Couturier, Robert D. Otto, Steve D. Côté, Glenn Luther, and Shane P. Mahoney

In many vertebrates size is one of the most influential and variable individual characteristics and a strong determinant of reproductive success. Body size is generally density dependent and decreases when intraspecific competition increases. Frequent and long distance movements increase energy expenditures and, therefore, may also influence body size, particularly in highly mobile species.