DENSITY: Mark–recapture estimation of population density.
Density implements the method of Efford (2004) for estimating absolute population density from closed-population samples.
Density also provides:
- a graphical interface for calculating closed-population estimates;
- a simulator for spatial mark-recapture sampling;
- a tool for developing new trap layouts;
- conventional estimation of density by the boundary-strip method;
- simple open-population analyses.
DENSITY 4.1 is now available at www.otago.ac.nz/density/
It includes a full implementation of likelihood-based methods.
DENSITY 4.1 implements new methods for estimating the density of animal populations from capture-recapture data collected using an array of 'detectors'. Detectors may be live-capture traps, with animals uniquely marked; they also may be sticky traps or snags that passively sample hair, from which individuals are distinguished by their DNA microsatellites, or cameras that take photographs from which individuals are recognized by their natural marks.
References
Efford, M.G. 2004: Density estimation in live-trapping studies. Oikos 106,
598–610. 
300K
Efford, M.G.; Dawson, D.K.; Robbins, C.S. 2004: DENSITY: software for analysing
capture-recapture data from passive detector arrays. Animal
Biodiversity and Conservation 27: 217-228. 438K.
Efford, M.G.; Warburton, B.; Coleman, M.C.; Barker, R.J. 2005: A field test of two methods for density estimation. Wildlife Society Bulletin 33: 731-738. 102K.