Use Menhinick Richness when you need to compute the Menhinick richness index as species count divided by the square root of individual count. Enter Individuals and Species count using the definitions and units below so the result can be reproduced.

Individuals

An integer count or setting greater than or equal to 1, expressed in individuals.

Species count

An integer count or setting greater than or equal to 1, expressed in species.

The published tool contract uses this rule: Compute the Menhinick richness index as species count divided by the square root of individual count.^[1]

Menhinick index

The calculated menhinick index.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small.

Retain the original Individuals and Species count values and their units alongside the result. Bootstrap Richness Proxy is useful when you instead need to compute the limited richness proxy Sobs + singletons divided by sample count. A full bootstrap richness estimator requires each species' observed incidence frequency. Margalef Richness provides another view by helping you compute the Margalef richness index from species count and total individuals.

• Bootstrap Richness Proxy

  Compute the limited richness proxy Sobs + singletons divided by sample count. A full bootstrap richness estimator requires each species' observed incidence frequency.

• Margalef Richness

  Compute the Margalef richness index from species count and total individuals.

• First Order Jackknife

  Estimate species richness with the first order jackknife from unique species across incidence samples.