Biodiversity indices

1.    Dominance

Measure of diversity whick takes into account both richness and evenness of species. It is often used to quantify the biodiversity of a habitat. A community dominated by one or two species is considered to be less diverse than one in which several different species have a similar abundance.

Simpson's Diversity Index is a measure of diversity which takes into account the number of species present, as well as the relative abundance of each species. As species richness and evenness increase, so diversity increases.

2.    Eveness

Species evenness refers to how close in numbers each species in an environment is mathematically it is defined as a diversity index, a measure of biodiversity which quantifies how equal the community is numericall.

3.    Species richnes

Richness R simply quantifies how many different types the dataset of interest contains. For example, species richness (usually noted S) of a dataset is the number of different species in the corresponding species list. Richness is a simple measure, so it has been a popular diversity index in ecology, where abundance data are often not available for the datasets of interest. Because richness does not take the abundances of the types into account, it is not the same thing as diversity, which does take abundances into account.

4.    The difference between wealth and abundance

 

In the picture shows the same species richness that is equally there are 3 species of trees but the relative abundance is different.