The Art and Zen of Camera Trapping
Habitat destruction and illegal hunting have led to increased concern regarding the status of wildlife populations both inside and outside protected areas. However, the lack of baseline data and absence of accurate estimates of population trends have prevented conservationists and wildlife managers from identifying, quantifying, and addressing suspected negative impacts. To assess wildlife population trends, scientifically based monitoring programs must be implemented (Karanth and Nichols, 1998, Mackenzie et al., 2006).
A common method for monitoring birds or primates is to walk through a forest, stop at each station in sequence, and record every bird or primate species observed or heard. This is the direct method of monitoring: the observer records detailed observations of what is seen or heard. Direct methods work well when the subject is easily observed or heard: most birds are comparatively easily observed or heard, many primates are vocal or move about in the canopy,...
KeywordsHome Range Occupancy Rate Camera Trap Mountain Gorilla Hexagonal Grid
The author wishes to thank Dieter Steklis and Netzin Gerald-Steklis for the opportunity to train the Dian Fossey Gorilla Fund International's Congolese and Rwandan field crews and to assist them in deploying camera traps in the Virunga volcanoes. Thanks also for their comments and suggestions here. I also thank anonymous reviewers for their suggestions.
- Carbone, C, Christie, S., Coulson, T., Franklin, N, Ginsberg, J., Griffiths, M., Holden, J., Kawanishi, K., Kinnard, M., Laidlaw, R., Lynam, A., Macdonald, D.W., Martyr, D., McDougal, C, Nath, L., O'Brien, T., Seidensticker, J., Smith, D., Sunquist, M., Tilson, R., and Wan Shahruddin, W.N. (2001). The use of photographic rates to estimate densities of tigers and other cryptic mammals. Animal Conservation 4:75–79.CrossRefGoogle Scholar
- El Alqamy, H., Wacher, T., Hamada, A., and Rashad, S. (2003). Personal Communication.Google Scholar
- Holden, J. (2001). Small cats in Kerinci Seblat National Park, Sumatra, Indonesia. Cat News.Google Scholar
- Karanth, K.U., and Nichols, J.D. (2002). Monitoring tigers and their prey. Centre for Wildlife Studies, Bangalore, India.Google Scholar
- MacKenzie, D.I., Nichols, J.D., Royle, J.A., Pollock, K.H., Bailey, L.L., and Hines, J.E. (2006). Occupancy estimation and modeling. Elsevier Academic Press, Burlington, MA.Google Scholar
- Pollock, K.H., Nichols, J.D., Brownie, C, and Hines, J.E. (1990). Statistical inference for capture-recapture experiments. Wildlife Monographs 107.Google Scholar
- White, G.C., Anderson, D.R., Burnham, K.P, and Otis, D.L. (1982). Capture-recapture and removal methods for sampling closed populations. Los Alamos National Laboratory, Los Alamos, NM.Google Scholar