Biodiversity Analyst > Biodiversity Indices

Eveness Indices

Evenness is a measure of the relative abundance of the different species in the same area. We can see the sample explained in Richness indices: Graph A and graph B have the same richness index, but as evenness is concerned, graph B would have higher equitability than graph A.

Pielou

Pielou index is a way to measure how the species are evenly distributed in a community. The Pielou index value is defined between 0 and 1. 1 represents a community with perfect evenness, and it decreases to zero as the relative abundances of the species diverge from evenness. Pielou index is similar with Simpson (1-D) index, which uses the formula whose sample is irreplaceable.