Diversity Metrics

Some diversity indicators

Different indices for describing the species diversity of communities have been designed by various scientists. These diversity metrics can assess the richness, the distribution, the functional level or the originality of these communities. We list some of them below:

Index	Measures	Formula
Species Richness S	Number of species	$\sum_{i} \ 1_{\RR_{+}^{*}} (p_{i})$
Shannon Wiener H	Richness and eveness	$- \sum_{i} p_{i} \log (p_{i})$
Simpson SI	Richness and eveness	${(\sum_{i} p_{i}^{2})}^{-1}$
Hill Generalized Entropy	Richness and eveness	${(\sum_{i} p_{i}^{α})}^{\frac{1}{1 - α}}$
Trophic Index	Functional Value	$\sum_{i} T_{i} p_{i}$
Rao's quadratic entropy	variability from distance d between species	$\sum_{i} \sum_{j} d_{i j} p_{i} p_{j}$
Weitzman index	originality	$W (X) = \max_{i \in X} (W (X \ {i}) + d (i, X \ {i}))$

Updated on 02/02/2016

Diversity Metrics

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