When every species in a sample is present, species evenness is greatest. As relative abundances fluctuate, evenness approaches zero. Indexes like the J' of Pileous can also be used to describe the evenness of species (1975).
The slope of the line reflects species evenness. Low species evenness is shown by a steep gradient, and higher species evenness is indicated by a shallow gradient. A widely used piece of software to create rank abundance plots is the biodiversity R package. A measure of the relative abundances of species within a community is called species evenness. Species richness and species evenness are combined to provide a value that describes a community in quantitative metrics of species diversity like the Shannon Index or Simpson Index. For example, consider a community of three species.
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