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the shannon index h' for a community that consists of only two species, which both have exactly the same number of individuals is one

A technique to gauge the species diversity in a community is to use the Shannon Diversity Index, also known as the Shannon-Wiener Index.

This index, designated as H, is figured out as follows:

H = -Σpi * ln (pi)

where:

Greek letter, which stands for "sum"

Natural log pi is defined as the percentage of species I that make up the total community. The variety of species in a given community is inversely correlated with H value. The variety decreases with decreasing H values. A community with a H value of 0 has a single species. An indicator of how evenly distributed the species are in a community is the Shannon Equitability Index.

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