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A Table for Calculating the `Equitability' Component of Species Diversity

Monte Lloyd and R. J. Ghelardi
Journal of Animal Ecology
Vol. 33, No. 2 (Jun., 1964), pp. 217-225
DOI: 10.2307/2628
Stable URL: http://www.jstor.org/stable/2628
Page Count: 9
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Abstract

We recognize two distinct components of species diversity: the number of species and the `equitability' with which the individuals are apportioned among the species. A quantitative expression for `equitability' per se is derived from the Shannon-Wiener function, using MacArthur's `broken-stick' model as a yardstick, and a table is provided which greatly reduces the necessary calculations. The appropriate use of this formula, and the sampling problems, depend very much on whether one is trying to describe the local conditions of association under which the animals are living or whether one is interested in characterizing the fauna of a large area as a whole.

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