Estimating population size by genotyping faeces

Monitoring coyote population dynamics by genotyping faeces.

Reliable population estimates are necessary for effective conservation and management, and faecal genotyping has been used successfully to estimate the population size of several elusive mammalian species. Information such as changes in population size over time and survival rates, however, are often more useful for conservation biology than single population estimates. We evaluated the use of ...

Estimating Population Size

All monitoring programs are designed to detect change in population size. Some require, in addition, estimates of population size itself. Two approaches to making such estimates, using various m ark-recapture methods or removal sampling, are described in this chapter. Whatever the method, estimation of population size requires extensive data collection and analysis and is labor-intensive and ti...

Estimating population size in emergencies.

One of the first challenges in a natural disaster or humanitarian emergency is to obtain accurate estimates of affected populations (1). In the aftermath of rapid-onset disasters such as the recent tsunami disaster in south Asia, there is frequently an absence of adequate baseline data against which to measure the impact of the disaster. Available population data vary widely in quality, and the...

Estimating Population Size From DNA-Based Closed Capture-Recapture Data Incorporating Genotyping Error

Estimating population size by spatially explicit capture–recapture

The number of animals in a population is conventionally estimated by capture–recapture without modelling the spatial relationships between animals and detectors. Problems arise with non-spatial estimators when individuals differ in their exposure to traps or the target population is poorly defined. Spatially explicit capture–recapture (SECR) methods devised recently to estimate population densi...