How to use Shannon Biodiversity Index to Compared Biodiversity

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11 Terms

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Shannon Biodiversity Index

A mathematical formula that is used to measure how diverse an ecosystem is. It considers both the number of species (richness) and how evenly individuals are spread across those species (evenness)

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Shannon Biodiversity Index Equation

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H

Represents the Shannon Biodiversity Index number; higher values indicate greater biodiversity.

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E

Represents the evenness of species in a population; higher E values indicate a more even population.

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Pi (Ď€)

Represents the proportion of a certain species in a population, calculated as the number of that species divided by the total population.

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S

Represents the number of species in a population.

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Steps to calculate H

  1. Calculate Pi for each species,

  2. Calculate natural log (ln) of Pi,

  3. Multiply each Pi by its ln,

  4. Sum these values,

  5. Multiply by -1 to get H.

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Natural logarithm (ln)

Mathematical function used in the Shannon Biodiversity Index calculations.

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Population biodiversity

The variety and variability of species within a given community or population.

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Species richness

The number of different species present in a community.

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Evenness

How evenly the individuals are distributed among the different species in a community.