Sampling from wildlife populations
1996
Surin Niyamangkoon (Kasetsart Univ., Bangkok (Thailand). Faculty of Science. Dept. of Statistics)
Wildlife population in a mobile population. Members of the wildlife population will have not fixed location. Knowing of population size is often very useful for studying of population characteristics. Estimation of population size may be performed by direct sampling and inverse sampling. For direct sampling, a random sample is drawn from the population, tagging each animal sampled, and returning the tagged animals to the population. At a later period, a second random sample of a fixed sample size is drawn from the same population, the number of tagged animals is observed. Then the estimate of the population size can be computed. For inverse sampling the method is similar to direct sampling with the exception that the second sample will continue sampling until a fixed number of tagged animals is recaptured. Then the estimate of the population size can also be computed. In general, inverse sampling have higher efficiency than direct sampling, except in the case that we have no information about the size of a large population, direct sampling will have higher efficiency than inverse sampling.
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