Species Diversity Calculator

Calculate species diversity using the Shannon Diversity Index based on species count and individual distribution.

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Shannon Diversity Index

1.842 H'

Maximum Possible H'2.303 H'max
Evenness (J)0.80 J
Average per Species20.0 individuals

Shannon Diversity Index vs Number of Species

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

Exemplo Resolvido

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

  1. 01Max diversity: ln(10) = 2.303
  2. 02Shannon index: 2.303 * 0.8 = 1.842
  3. 03Average per species: 200 / 10 = 20 individuals
  4. 04This indicates moderate diversity

Perguntas Frequentes

What is the Shannon Diversity Index?

The Shannon Index (H') combines species richness (number of species) and evenness (how equally individuals are distributed). Higher values indicate more diverse communities.

Why does evenness matter?

A habitat with 10 species where 90% are one species is less functionally diverse than one where all 10 species are equally represented. Evenness captures this distinction.

What is a healthy level of biodiversity?

It depends on the ecosystem. Tropical forests may have H' > 4, while tundra naturally has H' < 1. The concern is when diversity decreases relative to historical levels.

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