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Population Estimates and Distribution of the Wolverine and Chase Caribou Herds in North-central British Columbia
Information on population sizes and distribution of woodland caribou (Rangifer tarandus caribou) has not been
reported for the Chase and Wolverine herds of north-central British Columbia in over a decade. We used information
collected from relocations of radio-collared caribou (1991 to 2007) to describe new boundaries for these herds.
We also collated information from a variety of population surveys conducted since 1993, reanalyzed the data, and
estimated population sizes, typical group size, and calf recruitment. We concluded that both herds likely declined
since the early surveys but have recently begun to increase in numbers and are possibly at comparable sizes to
when they were first monitored. Based on an assessment of the varying survey methods used, we propose a standard
spatial unit design, sample size for estimates of recruitment, and overall levels of sampling effort as the basis
for subsequent surveys. The information about herd spatial distribution, recent population trends, and survey
design will form a foundation and bench-mark for future management of caribou range and for monitoring sustainable
forest management within the Chase and Wolverine herd areas.
