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Table 1.
Example of composite indices of biodiversity
Indicator | Méthode de calcul |
---|---|
Species number | S = Σ si avec si : ith species |
Shannon Index | H’ = - Σ pi . Ln pi
(a) with pi = proportion of species i (entre 0 et 1) |
Evenness | E = H’/Ln S |
Simpson’s Index | D = Σ pi 2 |
Reciprocal Simpson’s index | 1/D |
Buckland arithmetic Occurrence index: | BuckArith-OI= 100/S Σ Oi /Ri with Oi = site number where species i is observed Ri = site number where species i was observed |
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