Estimating population size by spatially explicit capture-recapture

Efford and Fewster clarified how spatially explicit capture-recapture can estimate the number of individuals within a defined region, bridging the gap between density (animals per unit area) and absolute population size for a study area of interest. They distinguished the realized population in a specific area from the expected population implied by a density estimate, and showed how to obtain each with appropriate uncertainty. This distinction matters for management questions framed in terms of how many animals occupy a particular reserve. The paper provided both conceptual clarity and practical estimators, strengthening the inferential foundation of SECR. It is a useful methodological reference for translating camera-trap density estimates into population-size statements for conservation and management of felids and other species.