cameratrapR: An R package for estimating animal density using camera trapping data |
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| Affiliation: | 2. University of Chinese Academy of Sciences, Yuquan Road, Beijing 100049, China;3. Cancer Registry of Norway, Ullernchausseen 64, 0379 Oslo, Norway;4. Changbai Mountain Academy of Sciences, Yanbian 133613, China;5. Department of Wildlife, Fisheries and Aquaculture, Mississippi State University, Mississippi State, MS 39762-9690, USA;6. Academy of Inventory and Planning, National Forestry and Grassland Administration, Beijing 100714, China;7. Department of Environmental Science and Policy, University of California, 1 Shields Avenue, Davis, CA 95616, USA;1. School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA;2. Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, USA;3. U.S. Geological Survey, Alabama Cooperative Fish and Wildlife Research Unit, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36845, USA |
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| Abstract: | - 1.Camera trapping plays an important role in wildlife surveys, and provides valuable information for estimation of population density. While mark-recapture techniques can estimate population density for species that can be individually recognized or marked, there are no robust methods to estimate density of species that cannot be individually identified.
- 2.We developed a new approach to estimate population density based on the simulation of individual movement within the camera grid. Simulated animals followed a correlated random walk with the movement parameters of segment length, angular deflection, movement distance and home-range size derived from empirical movement paths. Movement was simulated under a series of population densities. We used the Random Forest algorithm to determine the population density with the highest likelihood of matching the camera trap data. We developed an R package, cameratrapR, to conduct simulations and estimate population density.
- 3.Compared with line transect surveys and the random encounter model, cameratrapR provides more reliable estimates of wildlife density with narrower confidence intervals. Functions are provided to visualize movement paths, derive movement parameters, and plot camera trapping results.
- 4.The package allows researchers to estimate population sizes/densities of animals that cannot be individually identified and cameras are deployed in a grid pattern.
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