Sequential Sampling to Determine Population Density
In general terms, sequential sampling is advantageous because it provides an estimate of population intensity with predetermined, acceptable levels of precision at minimum cost. This chapter reviews the methods available for using sequential sampling to estimate population density and the corresponding performance of such plans. More formally, the following criteria require definition: objective(s) of the sampling program, appropriate sampling universe, sample unit, spatial distribution of the population, timing of sampling activity, and finally, selection and validation of the sequential sampling method. However, selected criteria are discussed when necessary to illustrate the use of various sequential sampling methods and their evaluation. The primary purpose is to present methods to assess the performance of the plan's ability to maintain precision as expected. The primary advantage of simulation is that it provides a systematic way to examine the behavior of sequential sampling results in general, and the performance of specific sampling plans for a given species or application.