Open Access

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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