Biodiversity Calculator

What biodiversity measure(s) would you like to have computed?

Glossary of Biodiversity Measures

  • Species Richness - The number of different species found in a particular environment.
  • Biodiversity - The number of different species of organisms in a particular environment.
  • Evenness (E) - A measure of how similar the abundances of different species are in the community.
  • Shannon-Weiner index (H) - This diversity measure came from information theory and measures the order (or disorder) observed within a particular system. In ecological studies, this order is characterized by the number of individuals observed for each species in the sample plot (e.g., biofilm on a plexiglass disc).
  • Simpson's index (D) - The probability that two randomly selected individuals in the community belong to the same category (e.g., species).
  • Simpson's index of diversity (1 - D) - The probability that two randomly selected individuals in a community belong to different categories (e.g., species).
  • Simpson's reciprocal index (1/D) - The number of equally common categories (e.g., species) that will produce the observed Simpson's index.

Script written by Maryland Sea Grant