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The Sampling Programme and the Measurement and Description of Dispersion

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Ecological Methods

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Abstract

As it is normally impossible to count all the invertebrates in a habitat, it is necessary to estimate the population by sampling; naturally the estimates should have the highest accuracy commensurate with the amount of work expended, and if this is to be so a sampling programme which lays down the distribution, size and number of samples will need to be drawn up. There is no universal sampling method and although the statistical principles are given in Cochran (1963), Hansen, Hurwitz & Madow (1953), Stuart (1962), Yates (1953), Elliott (1971), Elliott & Decamps (1973), and Seber (1973), ‘the sampling of a particular insect population must be resolved about the distribution and life-cycle of the insect involved’ (Graham & Stark, 1954). Assuming that the life-cycle is known, preliminary work will be necessary to gain some knowledge of the distribution of the insect and the cost (work involved) of sampling; the worker will also need to be quite clear as to the exact problem he is proposing to investigate (Lamb, 1958; Morris, 1960; Strickland, 1961). The importance of careful formulation of the hypothesis for test cannot be overstressed.

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    T. R. E. Southwood D.Sc., Ph.D, F.R.S. (Professor of Zoology and Applied Entomology)

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Southwood, T.R.E. (1978). The Sampling Programme and the Measurement and Description of Dispersion. In: Ecological Methods. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5809-8_2

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