Abstract
A desirable property of a diversity index is strict concavity. This implies that the pooled diversity of a given community sample is greater than or equal to but not less than the weighted mean of the diversity values of the constituting plots. For a strict concave diversity index, such as species richness S, Shannon's entropy H or Simpson's index 1-D, the pooled diversity of a given community sample can be partitioned into two non-negative, additive components: average within-plot diversity and between-plot diversity. As a result, species diversity can be summarized at various scales measuring all diversity components in the same units. Conversely, violation of strict concavity would imply the non-interpretable result of a negative diversity among community plots. In this paper, I apply this additive partition model generally adopted for traditional diversity measures to Aczél and Daróczy's generalized entropy of type α. In this way, a parametric measure of β-diversity is derived as the ratio between the pooled sample diversity and the average within-plot diversity that represents the parametric analogue of Whittaker's β-diversity for data on species relative abundances.
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Ricotta, C. Additive Partition of Parametric Information and Its Associated β-Diversity Measure. Acta Biotheor 51, 91–100 (2003). https://doi.org/10.1023/A:1024539526618
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DOI: https://doi.org/10.1023/A:1024539526618