Trap configuration and spacing influences parameter estimates in spatial capture-recapture models

Sun, Fuller, and Royle examined through simulation how detector spacing and array geometry affect bias and precision in spatially explicit capture-recapture estimates. They demonstrated that when detectors are spaced too far apart relative to the spatial scale of animal movement, individuals are rarely recaptured at multiple stations, degrading the spatial information SECR relies upon; when too close, the array may cover too little area. Their results reinforced the principle that spacing must be matched to sigma to produce the spatial recaptures needed for accurate density estimation. The study provided concrete guidance on configuring arrays for species with different movement scales. It is a commonly cited reference supporting design decisions in camera-trap density studies of mobile carnivores.