Species richness is a measure of both the number of species and the relative importance of each species based on its abundance, productivity, or size.

Species Richness

The variety of species found in a specific ecological community, landscape, or region.

Productivity

A measure of the efficiency of production, often defined as the output per unit of input.

Abundance

The great or plentiful amount of something in a particular environment, often used in ecology to describe the number of individuals of a particular species within a given area.