How to calculate species evenness?

The number of species in an area affects the diversity of them.Ecologists call the number of species in an area its richness and its relative abundance.They are measures of diversity.A game reserve with one zebra and one antelope has the same species richness but different species evenness.

When calculating species evenness, ecologists limit the taxonomy of interest since any particular area can have all kinds of species living together.Diversity of animals, plants or flowers can be included in the taxonomy of interest in a game reserve.

Count the number of species of interest to determine the species richness.There are orchids, roses, and marigolds in the garden.There are three species of flowers in this garden.

Divide the total number of all species by P(i) to calculate the proportion.The number of orchids is 10 divided by 140.The proportion of roses and marigolds is 0.143 and 0.714 respectively.

The formula H is used to calculate Shannon's diversity index.For each species, use the natural logarithm of the proportions lnP(i) and divide by one to get the result.The lnP(i) is equal to -0.189.The equivalent for roses and marigolds is.Theumming them gives a negative number.The negative is eliminated by multiplying by -1.Shannon's diversity index "H" equals 0.707.

To calculate the species evenness, divide Shannon's diversity index H by the natural logarithm of species richness.0.707 divided by 1.099 equals 0.64.The range of species evenness is zero to one, with zero signifying no Evenness and one being a complete evenity.