Calcolatore Diversità delle Specie — Formula

How to Calculate Species Diversity

The Shannon Diversity Index (H') measures both species richness and evenness of distribution.

Formula

H' = -Sum(pi * ln(pi)) for each species

Simplified: H' = ln(S) * J

Where S = number of species, J = evenness (0-1)

Interpretation

  • H' < 1: Low diversity
  • H' = 1.5-3.5: Moderate diversity
  • H' > 3.5: High diversity

    • Esempio Risolto

    A habitat with 10 species, 200 total individuals, and 0.8 evenness.

    1. Max diversity: ln(10) = 2.303
    2. Shannon index: 2.303 * 0.8 = 1.842
    3. Average per species: 200 / 10 = 20 individuals
    4. This indicates moderate diversity