Use this biodiversity measure when counts or incidences were collected with comparable sampling effort and the estimator matches the study design. It can summarize richness, dominance, evenness, or compositional difference.

Most abundant count

An integer count greater than or equal to 0, expressed in individuals.

Total individuals

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

The implementation follows this calculation rule: Compute the Berger Parker dominance index as the most abundant count over total individuals.

Berger-Parker dominance

The calculated berger-parker dominance.

Different diversity indices weight rare and common taxa differently. Detection probability, sample coverage, taxonomic resolution, zero counts, and unequal effort can dominate comparisons; proxy estimators are not interchangeable with their full published forms. Preserve the input values and units so the result can be audited and recalculated.

Report observed richness, abundance or incidence data, and sampling effort beside the index. Coverage-based rarefaction, accumulation curves, and more than one Hill-number order provide a fuller view of community structure.

• ACE Bias Corrected

  Estimate abundance-based species richness with ACE using the species observed at most ten times, their total individuals, singleton count, and the rare-frequency moment sum i(i-1)f_i. ACE is undefined when every rare individual is a singleton.

• Margalef Richness

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

• Bray-Curtis Dissimilarity

  Quantify compositional dissimilarity between two communities over two species with the Bray-Curtis index.